Acute Medicine, second edition

By Declan O'Kane

Acute Medicine 2e is a current and concise guide to hospital emergency medicine for registrars, junior doctors and medical students working on the wards.

This second edition has been comprehensively revised and updated to incorporate the latest treatment guidelines. It has been substantially rewritten and streamlined to enable the reader to access the pertinent information even more quickly. 

It is not just a list of instructions, but contains pathophysiology and useful clinical pearls:

detailed management of acute medical and surgical emergencies, including in pregnancy

general ward management issues

descriptions of key procedures

normal laboratory values

emergency drug formulary

From reviews of the first edition:

"This new book by Dr O’Kane is a very useful and interesting book directed towards Medical registrars but also with many positive features for anyone from Medical Student to Consultants... [It] works through groups of emergencies according to speciality and organ grouping. This is helpful as it enables the reader to link the different differentials together well.  It also tries to signpost all the different conditions in relation to the Acute Medicine and General Internal Medicine curriculums.

There is also an excellent section on fluid prescription, outlining what each fluid option contains along with potential fluid prescriptions in relation to the daily needs of the human body. Each clinical problem is presented in a clear and logical format, beginning with the things to ask or think about when receiving a referral - much as junior doctors would do in a real clinical situation. 

The book also includes an excellent 'general management’ section, which covers important aspects of the assessment of mental capacity and considerations to make when discharging a patient - things which are often poorly taught in other settings. All of the clinical procedures are described in some level of detail - not enough to learn to do the procedure but enough to signpost as well as getting the reader to think about why it is needed and any associated risks." - Journal for Acute Medicine, October 2015

• Language: English
• Publisher: Scion Publishing
• Release date: Oct 16, 2017
• ISBN: 9781911510215

Book preview

01   Resuscitation

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Ensure you are up to date with BLS and ALS courses. See your national guidelines, e.g. UK/US/European guidelines online. There is much in common in guidelines. The things that differ are due to a lack of evidence and so either way is defensible. Watch the videos on resuscitation at the UK Resuscitation Council site.

It is difficult to perform trials on resuscitation and much is extrapolated from basic theory and laboratory and animal experiments. Guidelines are just that and experienced clinicians who know and understand the evidence or lack of evidence can deviate to a degree.

Resuscitating an unresponsive pulseless apnoeic patient can be stressful and it is never as simple as a basic algorithm suggests. It is not uncommon to find yourself trying to cope with a collapsed patient wedged in a toilet cubicle. All you can do is your best. Such a patient is certifiable as dead and you cannot make that situation any worse. In a small number of cases you can make a significant difference.

Are you unsure of the rhythm – could it be VF? If so, do not hesitate to defibrillate. If there is any delay in defibrillation then get good quality CPR going, at least using chest compressions. Survival depends on the immediate initiation of chest compressions and early defibrillation if rhythm is shockable.

As soon as you arrive use the ABCs to quickly determine the basics – check the Airway is not obstructed, look for Breathing whilst palpating a major pulse to assess the Circulation. Commence chest compressions as quickly as possible; hopefully someone else will already have done so. Your concern is whether unresponsiveness is due to circulatory collapse or not. If unsure start CPR. It is less harmful to CPR a patient who turns out to have a pulse than to delay CPR in a pulseless patient. If possible let someone else do CPR as you take stock and look at the bigger picture. This is a very useful reason for the ABCs – to buy you some thinking and information-gathering time.

Once you have the defibrillator leads on, look at the rhythm and assess if it is shockable. If shockable then shock and treat for VT/VF. Go through the standard list of treatable causes, ensuring effective CPR continues.

Is there a ‘do not resuscitate’ form in the notes? Check for advanced directive or community DNACPR order. Are patient’s wishes expressed? If you can’t be sure then start and continue resuscitation as long as is reasonable. See DNACPR Section 19.19. Reassess and take senior advice especially in a young or hypothermic or overdosed patient. Stop when continuing is considered futile.

Those without a DNACPR should be for resuscitation. However, new guidance states that if the healthcare team is as certain as it can be that a person is dying as an inevitable result of underlying disease or a catastrophic health event, and CPR would not re-start the heart and breathing for a sustained period, CPR should not be attempted (Decisions Relating to CPR 3e (BMA, Resus Council (UK), RCN) 2016). I would still expect there to be an emphasis to make reasonable attempts to discuss with family and attempt to discuss DNACPR if death was predictable.

Emphasis should be on cardiac arrest prevention and so care should be instigated pre-arrest when reversible factors can be dealt with. If a patient is in extremis and pre-arrest, then call the arrest team early before the patient is pulseless. The ABC assessment gives you time to think of your plan. Delegate roles.

If you are leading the arrest, then ask others to get venous/intraosseous access and obtain notes. Determine the ceiling of care. Contact your senior if unsure or unclear. Send away extra staff if there are demands elsewhere. Extra hands might be more productive seeing other sick patients and preventing cardiac arrests elsewhere.

Stop once you all feel that continuing is futile. Thank the team. Complete audit sheets and record all in the patient notes. Arrange to talk with family. Do a self-debrief: anything you would do differently or better? Seek feedback and add to your PDP.

Favourable outcome: witnessed arrest; in-hospital; early effective CPR; shockable rhythm; early defibrillation; hypothermia (e.g. submerged in icy water).

Safety: make sure you, the victim and any bystanders are safe.

Response: check victim for a response. Gently shake shoulders and ask loudly: Are you all right?. If responds leave in the position in which you find him, provided no further danger; get help if needed; reassess regularly.

Airway: open the airway. Turn victim onto back. Place your hand on forehead and gently tilt head back; with your fingertips under the point of the victim’s chin, lift the chin to open the airway.

Breathing: look, listen and feel for normal breathing for no more than 10 seconds. In the first few minutes after cardiac arrest, a victim may be barely breathing, or taking infrequent, slow and noisy gasps. Do not confuse this with normal breathing. If you have any doubt whether breathing is normal, act as if it is they are not breathing normally and prepare to start CPR. Call for help and Arrest Team.

Send for AED: send someone to get an AED if available. If you are on your own, do not leave the victim, start CPR.

Chest compressions (CCs): kneel by the patient. Place the heel of one hand on the lower sternum. Place heel of your other hand on top of the first hand. Interlock the fingers of your hands and ensure that pressure is not applied over the patient’s ribs. Keep your arms straight. Do not apply any pressure over the upper abdomen or the bottom end of the bony sternum. Position your shoulders vertically above the patient’s chest and press down on the sternum to a depth of 5–6 cm. After each CC, release all the pressure on the chest without losing contact between your hands and the sternum; repeat at a rate of 100–120 per min.

Give rescue breaths: after 30 compressions open the airway again using head tilt and chin lift and give 2 rescue breaths. Pinch the soft part of the nose closed, using the index finger and thumb of your hand on the forehead. Allow the mouth to open, but maintain chin lift. Take a normal breath and place your lips around his mouth, making sure that you have a good seal. Blow steadily into the mouth while watching for the chest to rise, taking about 1 second as in normal breathing; this is an effective rescue breath. Maintaining head tilt and chin lift, take your mouth away from the victim and watch for the chest to fall as air comes out. Take another normal breath and blow into the victim’s mouth once more to achieve a total of two effective rescue breaths. Do not interrupt CCs by more than 10 seconds to deliver two breaths. Then return your hands without delay to the correct position on the sternum and give a further 30 chest compressions. Continue with CCs and rescue breaths in a ratio of 30:2. If you are untrained or unable to do rescue breaths, give CC-only CPR at a rate of at least 100–120 per min.

Basic life support algorithm.

Reproduced with permission from the Resuscitation Council (UK) 2015.

If an AED arrives: switch it on. Attach the electrode pads on the patient’s bare chest. If more than one rescuer is present, CPR should be continued while electrode pads are being attached to the chest. Follow the spoken/visual directions. Ensure that nobody is touching the patient while the AED is analysing the rhythm. If a shock is indicated, deliver shock but ensure that nobody is touching the patient, push shock button as directed (fully automatic AEDs will deliver the shock automatically), immediately restart CPR at a ratio of 30:2. Continue as directed by the voice/visual prompts. If no shock is indicated, immediately resume CPR. Continue as directed by the voice/visual prompts.

Continue CPR: do not interrupt resuscitation until you become exhausted or the patient is definitely waking up, moving, opening eyes and breathing normally. It is rare for CPR alone to restart the heart. Only if you are certain the person has recovered continue CPR.

Recovery position: if certain the patient is breathing normally but still unresponsive, place in the recovery position. Remove the patient’s glasses, if worn, kneel beside the patient and make sure that both legs are straight. Place the arm nearest to you out at right angles to his body, elbow bent with the hand palm-up. Bring the far arm across the chest, and hold the back of the hand against the patient’s cheek nearest to you. With your other hand, grasp the far leg just above the knee and pull it up, keeping the foot on the ground. Keeping his hand pressed against cheek, pull on the far leg to roll the patient towards you on to side. Adjust the upper leg so that both the hip and knee are bent at right angles. Tilt the head back to make sure that the airway remains open. If necessary, adjust the hand under the cheek to keep the head tilted and facing downwards to allow liquid material to drain from the mouth. Check breathing regularly. Be prepared to restart CPR immediately if the patient deteriorates or stops breathing normally.

American guidance 2015 for the single rescuer is to initiate chest compressions before giving rescue breaths (C–A–B for chest compression (100–120 per min)–airway–breathing rather than A–B–C) to reduce delay to first compression. The single rescuer should begin CPR with 30 compressions then 2 breaths. All lay rescuers should, at a minimum, provide chest compressions for victims of cardiac arrest.

New points: minimise all interruptions to chest compression (CCs) to less than 5 seconds when attempting defibrillation or tracheal intubation by preplanning and coordination. Waveform capnography can identify return of spontaneous circulation. Peri-arrest ultrasound can help identify reversible causes. Extracorporeal life support techniques may be used as a rescue therapy in selected patients where standard ALS measures are not successful.

Advanced life support algorithm.

Reproduced with permission from the Resuscitation Council (UK) 2015.

Ventricular fibrillation.

Pulseless VT (pVT).

Confirm cardiac arrest: signs of life and normal breathing. If trained to do so, check for breathing and pulse simultaneously. Call resuscitation team. Perform uninterrupted CCs while applying defibrillation/monitoring pads – one below the right clavicle and the other in the V6 position in the midaxillary line. Plan and communicate pausing CCs for rhythm analysis. Stop CCs; confirm VF/pVT from the ECG. This pause in CCs should be brief and no longer than 5 seconds. Resume CCs immediately; warn all rescuers other than the individual performing the CCs to stand clear and remove any oxygen delivery device as appropriate. The designated person selects energy on the defibrillator and presses the charge button. Use at least 150 J for the first shock, the same or a higher energy for subsequent shocks. If unsure of the correct energy level for a defibrillator choose the highest available energy. Ensure person giving the CCs is the only person touching the patient. Once the defibrillator is charged and the safety check is complete, tell rescuer doing the CCs to stand clear; when clear, give the shock. After shock delivery immediately restart CPR using a ratio of 30:2, starting with CCs. Do not pause to reassess the rhythm or feel for a pulse. The total pause in CCs should be brief and no longer than 5 seconds. Continue CPR for 2 min; the team leader prepares the team for the next pause in CPR. Pause briefly to check the monitor. If VF/pVT, repeat steps above and deliver a second shock. If VF/pVT persists, repeat steps above and deliver a third shock. Resume CCs immediately. Give ADRENALINE 1 mg IV and AMIODARONE 300 mg IV while performing a further 2 min CPR. Withhold adrenaline if there are signs of return of spontaneous circulation (ROSC) during CPR. Repeat this 2 min CPR – rhythm/pulse check – defibrillation sequence if VF/pVT persists. Give further ADRENALINE 1 mg IV after alternate shocks (i.e. approximately every 3–5 min). If organised electrical activity compatible with a cardiac output is seen during a rhythm check, seek evidence of ROSC (check for signs of life, a central pulse and end-tidal CO2 if available). If there is ROSC, start post-resuscitation care. If there are no signs of ROSC, continue CPR and switch to the non-shockable algorithm. If asystole is seen, continue CPR and switch to the nonshockable algorithm. Consider a further dose of AMIODARONE 150 mg IV after 5 defibrillation attempts. LIDOCAINE 1 mg/kg may be used as an alternative if amiodarone is not available but do not give lidocaine if amiodarone has been given already.

Waveform capnography: can enable ROSC to be detected without pausing CCs. It may help avoid bolus injection of adrenaline after ROSC has been achieved. Several human studies have shown that there is a significant increase in end-tidal CO2 when ROSC occurs. If ROSC is suspected during CPR withhold adrenaline. Give adrenaline if cardiac arrest is confirmed at the next rhythm check.

Adrenaline (epinephrine): regardless of the arrest rhythm, after the initial adrenaline dose has been given, give further 1 mg doses of adrenaline every 3–5 min until ROSC is achieved; in practice, this will be about once every two cycles of the algorithm. If signs of life return during CPR (e.g. purposeful movement, normal breathing or coughing), or there is an increase in end-tidal CO2, check the monitor; if an organised rhythm is present, check for a pulse. If a pulse is palpable, start post-resuscitation care. If no pulse is present, continue CPR.

Witnessed, monitored VF/pVT: if a patient has a monitored and witnessed cardiac arrest in the catheter laboratory, coronary care unit, a critical care area or whilst monitored after cardiac surgery, and a manual defibrillator is rapidly available: confirm cardiac arrest and shout for help. If the initial rhythm is VF/pVT, give up to three quick successive (stacked) shocks. Rapidly check for a rhythm change and, if appropriate, ROSC after each defibrillation attempt. Start CC and continue CPR for 2 min if the third shock is unsuccessful.

Precordial thump: unlikely to cardiovert. Consider only when it can be used without delay whilst awaiting the arrival of a defibrillator in a monitored VF/pVT arrest. Using the ulnar edge of a tightly clenched fist, deliver a sharp impact to the lower half of the sternum from a height of about 20 cm.

Pulseless electrical activity (PEA): cardiac arrest in the presence of electrical activity (other than VT) that would normally be associated with a palpable pulse. Often have some mechanical myocardial contractions, but not enough to produce a detectable pulse or BP. PEA can be caused by reversible conditions that can be treated if they are identified and corrected. Survival with asystole or PEA is unlikely unless a reversible cause can be found and treated effectively.

Asystole: check the ECG for P waves as patient may respond to cardiac pacing when there is ventricular standstill with continuing P waves. There is no value in attempting to pace true asystole.

Treatment of PEA and asystole: start CPR 30:2. Give ADRENALINE 1 mg IV as soon as intravascular access is achieved. Continue CPR 30:2 until the airway is secured – then continue CCs without pausing during ventilation. Recheck the rhythm after 2 min: if electrical activity compatible with a pulse is seen, check for a pulse and/or signs of life and if a pulse and/or signs of life are present, start post-resuscitation care. If no pulse and/or no signs of life are present (PEA or asystole): continue CPR, recheck the rhythm after 2 min and proceed accordingly. Give further ADRENALINE 1 mg IV every 3–5 min (during alternate 2 min loops of CPR). If VF/pVT at rhythm check, change to shockable side of algorithm.

Hypoxia: ensuring airway patent, adequate ventilation, maximal FiO2 during CPR with BVM or intubation. Check adequate chest rise and bilateral breath sounds. Check ET tube is not misplaced in a bronchus or the oesophagus. Section 4.5.

Hypovolaemia: PEA caused by hypovolaemia is usually due to severe haemorrhage. Clues may be trauma, GI bleeding or signs of ruptured AAA. Stop the haemorrhage and restore intravascular volume with fluid and blood products. Other causes include anaphylaxis and other causes of shock. Needs IV access x2, IV fluids (normal saline (NS)). Blood if severe haemorrhage (O-neg). See Haemorrhagic shock Section 2.22.

Hyperkalaemia: if suspect K+ >6.5 mmol/L give 10 ml 10% CALCIUM GLUCONATE IV and 10 U INSULIN with 50 ml 50% GLUCOSE over 15 mins. Section 5.3.

Hypocalcaemia/calcium channel blocker toxicity: 10 ml 10% CALCIUM GLUCONATE IV. Section 5.6.

Hypoglycaemia: GLUCAGON 1 mg IM/SC and if IV access 50 ml 50% GLUCOSE or equivalent must be given. Section 5.2.

Hypothermia: drowning, exposure. Rectal temperature. Rewarm. Hypothermia is neuroprotective. Do not stop until patient rewarmed and resuscitation fails. Section 17.6.

Coronary thrombosis is the most common cause of sudden cardiac arrest. Even if ROSC has not been achieved, consider primary PCI when feasible continuing CPR. For ACS Section 3.8.

Pulmonary embolism: mechanical circulatory obstruction, consider immediate thrombolysis and CPR even in cases requiring in excess of 60 min of CPR. Consider performing CPR for 60–90 min before stopping. In some, surgical or mechanical thrombectomy can considered. For PE Section 4.17.

Tension pneumothorax: trauma associated or ventilated patient. Clinical/ultrasound diagnosis. Do not wait for CXR. Insert needle in 2nd interspace on affected resonant side (trachea deviated away). Diagnostic ‘hiss’ hopefully as decompresses. BP should improve. Insert chest drain. Section 4.12.

Tamponade: signs (raised JVP, low BP) obscured by the arrest itself. Suspected if penetrating chest trauma, anticoagulants, recent MI or cardiac intervention. May need resuscitative thoracotomy or needle pericardiocentesis. Ultrasound is diagnostic. Section 3.20.

Toxins: look for evidence of drugs taken and treat accordingly. Local anaesthetic or lipophilic drug cardiotoxicity consider 100 ml IV bolus of 20% intralipid emulsion in a 70 kg adult followed by an infusion and continue good quality CPR. See intralipid in toxicology chapter (Sections 14.6 & 14.8).

Mechanical chest compression devices not recommended unless having to transport patient or to relieve other members of the team during prolonged arrests.

Use of ultrasound imaging: focused echo/USS can help diagnose and treat potentially reversible causes of cardiac arrest. Challenging to perform during CPR. A sub-xiphoid probe position is recommended. Placement of the probe just before compressions are paused for a planned rhythm assessment enables a well-trained operator to obtain views within 10 seconds. Can diagnose tamponade, PE, hypovolaemia, PTX. Absence of any cardiac motion is highly predictive of death.

Blood gas values: during cardiac arrest are misleading and bear little relationship to the tissue acid–base state. Analysis of central venous blood may provide a better estimation of tissue pH.

Oxygen during defibrillation: remove oxygen mask or nasal cannulae to at least 1 m away from the patient’s chest during defibrillation. Leave the ventilation bag connected to the tracheal tube or other airway adjunct or disconnect the ventilation bag from the tracheal tube and move it at least 1 m from the patient’s chest during defibrillation.

Airway management and ventilation: options are no airway and no ventilation (compression-only CPR), compression-only CPR with the airway held open (with or without supplementary oxygen), mouth-to-mouth breaths, mouth-to-mask, bag-mask ventilation with simple airway adjuncts, supraglottic airways (SGAs), and tracheal intubation (inserted with the aid of direct laryngoscopy or videolaryngoscopy, or via a SGA). Patients who remain comatose post resuscitation will usually require intubation. Personnel skilled in advanced airway management should attempt laryngoscopy and intubation without stopping chest compressions; a brief pause in chest compressions may be required as the tube is passed through the vocal cords, but this pause should be less than 5 seconds. In the absence of these, use bag-mask ventilation and/or an SGA until appropriately experienced and equipped personnel are present.

Basic airway manoeuvres and airway adjuncts: assess the airway. Use head tilt and chin lift, or jaw thrust to open the airway. Simple airway adjuncts (oropharyngeal or nasopharyngeal airways) can help to maintain an open airway. If risk of cervical spine injury, use jaw thrust or chin lift with manual in-line stabilisation of the head and neck by an assistant. If life-threatening airway obstruction persists despite effective application of jaw thrust or chin lift, add head tilt in small increments until the airway is open; establishing a patent airway takes priority over concerns about a potential cervical spine injury.

Ventilation: artificially ventilate as soon as possible if spontaneous ventilation is inadequate or absent. Expired air ventilation (rescue breathing) FiO2 is only 0.17 so aim to ventilate with oxygen-enriched air. Consider pocket resuscitation mask with mouth-to-mask ventilation and supplemental oxygen. A two-person technique for bag-mask ventilation is preferable. Deliver each breath over 1 second and give a volume that corresponds to normal chest movement; this represents a compromise between giving an adequate volume, minimising the risk of gastric inflation, and allowing adequate time for CC. During CPR with an unprotected airway, give two ventilations after each sequence of 30 CCs. Once intubated, ventilate the lungs at a rate of about 10 breaths/min.

Alternative airway devices: an endotracheal tube is the optimal method of managing the airway during cardiac arrest. However, it is not without its difficulties in insertion. Several alternative airway devices have been used for airway management during CPR. These include the classic laryngeal mask airway (cLMA), the laryngeal tube (LT) and the i-gel, and the LMA supreme (LMAS). Laryngeal mask airway (LMA): easy to insert and ventilation is more efficient and easier than BVM. If gas leakage is excessive, chest compression will have to be interrupted to enable ventilation. Can give some airway protection. Tracheal intubation: should be attempted only by trained personnel able to carry out the procedure with a high level of skill and confidence. No intubation attempt should interrupt CCs for more than 5 seconds. Use an alternative airway technique if tracheal intubation is not possible. After intubation, tube placement must be confirmed and the tube secured adequately. Videolaryngoscopy: used increasingly as it enables a better view of the larynx and increases success rate of intubation. May be useful during CPR. Confirmation of correct placement of ET tube: end-tidal CO2 detectors that include a waveform graphical display (capnographs) are the most reliable for verification of tracheal tube position during cardiac arrest. If not available observe chest expansion bilaterally, listen over lung fields bilaterally in the axillae (breath sounds should be equal and adequate) and over the epigastrium (breath sounds should not be heard). Cricothyroidotomy: if it is impossible to ventilate an apnoeic patient with a bag-mask, or to pass a tracheal tube or alternative airway device, delivery of oxygen through a cannula or surgical cricothyroidotomy may be life saving. A tracheostomy is contraindicated in an emergency, as it is time consuming, hazardous and requires considerable surgical skill and equipment.

There is a paucity of good evidence. Drugs are of secondary importance to high quality uninterrupted CC and early defibrillation.

Adrenaline (epinephrine): no evidence for survival to hospital discharge, only improved short-term survival. Trials are ongoing.

Antiarrhythmics: no drug shown to increase survival to discharge. Amiodarone increases survival to admission. Ongoing trial comparing amiodarone to lidocaine.

Vascular access during CPR: Get vascular access if possible. Peripheral venous cannulation is quicker, easier to perform and safer. If drugs given then give a 20 ml flush and elevate the limb for 10–20 sec to facilitate drug delivery to the central circulation.

Intraosseous route: if no IV access then consider intraosseous (IO) route. Effective route in adults. Plasma concentrations comparable with IV injection. Sternal IO route comparable with IV adrenaline. Several IO devices are available using humerus, proximal or distal tibia, and sternum. Use as per local experience and skills and kit.

Extracorporeal cardiopulmonary resuscitation (ECPR): should be considered as a rescue therapy for those patients in whom initial ALS measures are unsuccessful and/or to facilitate specific interventions (e.g. coronary angiography and percutaneous coronary intervention (PCI) or pulmonary thrombectomy for massive pulmonary embolism). Requires vascular access and a circuit with a pump and oxygenator and can provide a circulation of oxygenated blood to restore tissue perfusion. Can be a bridge to allow treatment of reversible underlying conditions. This is extracorporeal life support (ECLS), and more specifically extracorporeal CPR (ECPR). Can improve survival when there is a reversible cause for cardiac arrest (e.g. ACS/PE, severe hypothermia, poisoning). Useful if cardiac arrest is witnessed, the individual receives immediate high quality CPR, and ECPR is implemented early (e.g. within 1 h of collapse) including when instituted by emergency physicians and intensivists.

Duration of resuscitation attempt: if resuscitation is unsuccessful the team leader should discuss stopping CPR with the team. Requires a careful assessment of the likelihood of success. It is reasonable to continue if the patient remains in VF/pVT, or there is a potentially reversible cause that can be treated. The use of mechanical compression devices and ECPR techniques make prolonged attempts at resuscitation feasible in selected patients. It is generally accepted that asystole for more than 20 min in the absence of a reversible cause and with ongoing ALS constitutes a reasonable ground for stopping further resuscitation attempts. Guidance is that resuscitation may be discontinued if all of the following apply: (1) 15 min or more has passed since the onset of collapse, (2) no bystander CPR was given before arrival of the ambulance, (3) there is no suspicion of drowning, hypothermia, poisoning/overdose, or pregnancy, (4) asystole is present for more than 30 sec on the ECG monitor screen.

Do not interrupt CPR unless definite signs of recovery. Keep pauses as short as possible. Plan and coordinate interruptions so they are as short as possible. Compression-only CPR where unable/unwilling to give rescue breaths.

Post-cardiac surgery cardiac catheterisation: cardiac arrest where CCs difficult. Give 3 quick consecutive ‘stacked’ (repeated) shocks before starting CCs. Consider re-sternotomy (reopening the sternal wound) to exclude tamponade. Internal defibrillation with paddles. Direct cardiac compression can be given to the heart. Use 20 J in cardiac arrest but only 5 J if supported on cardiopulmonary bypass.

Post drowning: immediately start CPR and 15 L/min O2; ROSC prior to hospital suggests better prognosis. Look for and treat high K+ with fresh water drowning. Look for and manage compounding issues, e.g. associated hypothermia/exposure, drug overdose or suicide attempt. Duration of hypoxia is the most critical survival factor.

Post electrocution: extensive burns can affect face, neck and airway. CPR because patient may be in VF or asystole with early intubation if possible. Asystole is seen after DC shock and VF after AC shock (mains supply). Check for secondary spinal injury or other trauma. Muscle paralysis can cause respiratory failure (reduced FVC <1.5 L). Fluid resuscitation as tissue/muscle damage. Ensure good diuresis, watch for AKI and check CK and K+.

Cardiac arrest in pregnancy: Caesarean section within 5 min of the cardiac arrest can save mother and baby. Call maternal cardiac arrest team and obstetrician immediately and note time. After 20 weeks aortocaval compression left lateral tilt (right side high and left side low). Use a fixed wedge or a large gravid uterus can be manually displaced to the left. Optimal CCs in higher position on sternum. Ventilate: BVM 100% O2 and monitor capnography. Optimal airway control. Follow ALS algorithm using same drugs. Place IV access above diaphragm (not femoral) and give IV fluids as needed. Defibrillation is regarded as safe throughout pregnancy. Remove fetal monitors during defibrillation. If you suspect magnesium toxicity stop it and give 10 ml IV 10% CALCIUM GLUCONATE. If no ROSC within 4 min then emergency Caesarean section and aim to deliver within 5 min of resuscitation commencing. Delivery can be life saving for mother and fetus and may improve a desperate situation. Possible causes: bleeding coagulopathy, DIC, sepsis, acute MI, concealed haemorrhage – placental abruption, ectopic pregnancy, rupture or dissection of aneurysms, pulmonary embolus (thrombolysis if life-threatening PE), amniotic fluid embolism (immediate Caesarean), anaesthetic complication, known or new cardiac disease, HTN, pre-eclampsia/eclampsia, placenta abruptio/placenta praevia. Discuss an urgent management plan for these if ROSC – most are obstetric.

ROSC: diagnose if palpable central pulse or sudden increase in end-tidal CO2 trace. (Continuous quantitative waveform capnography for monitoring of ET tube placement is a useful marker that identifies ROSC.) If signs of ROSC then complete assessment: ABC. O2/ventilation. You bring the patient back from death so the immediate questions are why the cardiac arrest and anticipate possible complications. Get an ECG, ABG, U&E, troponin. Again ask why. Get a 12-lead ECG. Is it STEMI needing primary PCI/thrombolysis, acute PE needing thrombolysis, hyperkalaemia needing calcium and insulin/glucose?

Stabilise: ABC: high FiO2 can now be reduced to give O2 as per BTS guidance. Check FBC, U&E, ABG, CXR, 12-lead ECG, Mg²+, Ca²+, troponin, lactate. Of these the ECG is the most useful as a large MI should be evident. If STEMI then PPCI is the next approach if stable.

Induced hypothermia may be neuroprotective. Indicated in those comatose following ROSC due to VF arrest. Involves cooling to 32–34°C for 12–24 h or longer post-ROSC. Evidence in non-VF arrest lacking but is used in comatose patients after either form of arrest. Methods include cooling blankets and ice bags as well as ice-cold isotonic infusion. Up to 3 L has been given in some trials.

Glycaemic control: aim for glucose control of 6–11 mmol/L. Avoid hypoglycaemia which can cause or exacerbate brain injury.

Coagulopathy: watch for signs and check APTT, FBC, PT, platelets, fibrinogen if any doubt.

Hypotension: treat (SBP <90 mmHg) by addressing cause with a choice of inotrope and/or vasopressor, e.g. (Section 2.17 on inotropes). Fluids: 1–2 L of NS or Ringer’s lactate. Chilled to 4°C for induced hypothermia. Other vasopressors are listed later.

Post-arrest myocardial dysfunction: may be related to an underlying STEMI but a period of hypoperfusion can result in temporarily impaired pump function for up to 72 h which can be bridged with DOBUTAMINE and intra-aortic balloon pump if required.

Low BP and shock may be partly driven by a SIRS type mechanism with a drop in systemic vascular resistance and in these cases NORADRENALINE infusion may be useful – take expert advice (and Section 2.17 on inotropes). This is best delivered within an ITU setting with access to invasive monitoring.

Arrhythmias: see below for management of tachy-/bradyarrhythmias.

Seizures and myoclonic jerks: can be seen post-ROSC in up to 10% of patients. These can be managed conservatively but if significant and frequent then may consider anticonvulsants. Clonazepam can be used for myoclonus as well as valproate.

Oxygen: 15 L/min with a non-rebreather mask gives an FiO2 of about 90% and is recommended in cardiac arrest and shock, but should be reduced post-arrest to avoid O2 toxicity. Follow BTS guidance. Watch O2 saturation. Watch for CO2 retention, which can only be diagnosed by ABG.

SBP goal is >100 mmHg. Use fluids, an arterial line, and pressors/inotropes (noradrenaline and dobutamine) as needed. Coronary angiography is strongly recommended for patients with ST elevation or new LBBB. Though the guidelines recognise that evidence is limited, they also recommend consideration of PCI for other patients without a known non-cardiac source.

Electrolytes: keep potassium between 4.0 and 4.5 mmol/L. Monitor BM and avoid tight glucose control, particularly hypoglycaemia.

Do not give atropine to patients with cardiac transplants. Denervated hearts do not respond to vagal blockade by atropine, which may cause paradoxical sinus arrest or high-grade AV block in these patients.

Causes: physiological (e.g. during sleep, in athletes), cardiac causes (e.g. AV block or sinus node disease), non-cardiac causes (e.g. vasovagal, hypothermia, hypothyroidism, hyperkalaemia), drugs (e.g. beta-blockade, diltiazem, digoxin, amiodarone).

Management: see algorithm below. Give up to 6 × 0.5 mg (3 mg) of ATROPINE, ISOPRENALINE 5 mcg/min IV, ADRENALINE 2–10 mcg/min. Give IV GLUCAGON if a beta-blocker or calcium channel blocker is a likely cause of the bradycardia. DIGIBIND if due to digoxin toxicity. IV THEOPHYLLINE (100–200 mg by slow IV injection) for bradycardia complicating acute inferior wall myocardial infarction, spinal cord injury or cardiac transplantation. US (AHA) guidance: ADRENALINE/EPINEPHRINE 2–10 mcg/min or DOPAMINE 2–10 mcg/kg per minute. Also see bradycardia Section 3.15.

Adult bradycardia algorithm.

Reproduced with permission from the Resuscitation Council (UK) 2015.

Assess: ABCDE. Give O2 if appropriate and obtain IV access. Monitor ECG, BP, SpO2, record 12-lead ECG. Troponin. Check U&E.

Management: if unstable (i.e. has adverse features likely to be caused or made worse by the tachycardia, e.g. shock, syncope, chest pain/ischaemia, heart failure) synchronised cardioversion is the treatment of choice. Uncommon for tachycardia to cause compromise significantly with rate 100–150 per min unless existing cardiorespiratory disease. If cardioversion fails to restore sinus rhythm, and the patient remains unstable, give AMIODARONE 300 mg IV over 10–20 min and re-attempt electrical cardioversion. The loading dose of AMIODARONE may be followed by an infusion of 900 mg over 24 h. Management of SVT and VT also detailed in cardiology chapter (tachyarrhythmias, Sections 3.11–16).

Tachycardia algorithm.

Reproduced with permission from the Resuscitation Council (UK) 2015.

Indication: DC cardioversion (if we treat VF it is called defibrillation) should be considered in all fast and unstable tachyarrhythmias. Usually the ventricular rate is >150/min. If there is chest pain, pulmonary oedema, syncope or shock due to the arrhythmia.

Contraindications: these are relative. For elective DCC digitalis toxicity is a concern as it can cause ventricular arrhythmias – usually 1 or 2 doses omitted if elective. DCC does not reverse sinus tachycardia or multifocal atrial tachycardia. Concerns about non-anticoagulated AF of duration >48 h and embolic/stroke risk needs to be weighed against the need for improving haemodynamics. Ideally a TOE to identify left atrial appendage thrombus should be done. This may not be practical or feasible or available in the emergency situation. Take expert advice. In these cases some form of rate control rather than rhythm control may be tried, but DC cardioversion is quick and often effective.

Sedation: enlist help of anaesthetist to protect airway. If conscious needs sedation, e.g. MIDAZOLAM 2.5 mg slow IV (max 7.5 mg ) is the sedation of choice and provides amnesia and sedation. ANNEXATE and airway control and bag-valve mask should be available for oversedation. Written consent if possible. Use pulse oximetry and ECG monitoring via the pads. Remove nitrate patches. Ensure good IV access. Remove oxygen at shock.

DC cardioversion: place pads on the chest (anterior posterior may be preferred for AF). Broad complex or AF use a biphasic shock of 120–150 J or monophasic 200 J; for atrial flutter or SVT, use 70–120 J. Ensure that the defibrillator is ‘synced’ with the R wave of the QRS complexes. There is a sync button which does this and a bright dot appears on the R wave – this avoids shocking on a T wave and inducing VF. Give 3 successive shocks if there is no immediate cardioversion, giving up to full energy available. Ensure you warn all before giving the shock. If no success, consider repeating after AMIODARONE 150–300 mg slow IV over 20 min. Post procedure recovery position as tolerated until wakes up.

Elective cardioversion for AF: those on warfarin should have evidence of levels of INR within the therapeutic window for the past 4 weeks prior to the procedure. Evidently in the emergency situation this is waived, but therapeutic LMWH should be given if not anticoagulated and continued for 4 weeks post procedure, irrespective of outcome. In some cases a TOE showing absence of thrombus in the left atrial appendage can suggest that elective cardioversion can proceed without pre-existing anticoagulation. Take advice if unsure.

Complications: skin soreness like a sunburn over the pads, arrhythmias, stroke (DC cardioversion may precipitate systemic emboli from intracardiac thrombus) especially in AF which is not anticoagulated, failure is seen in many with AF but more successful in VT and atrial flutter and SVT, mild troponin rises.

Relative contraindications need to be balanced with urgency and risks of inaction. These are uncorrected bleeding disorders, e.g. low platelets, ↑INR. A long needle is passed using a sub-xiphoid approach under strict asepsis and local anaesthesia, with echo/ultrasound control, aspirating with needle at 30° to skin with the patient sitting up at 45° angle, aiming for tip of the left shoulder.

Connect a 20 or 50 ml syringe to the spinal needle, and aspirate 5 ml of IV NS into the syringe. While advancing the needle, the occasional injection of up to 1 ml of NS helps to keep the needle lumen patent. Seldinger technique is used and a wire is passed; once the pericardial space is entered then a floppy soft-tipped guide-wire is passed into the space and around the heart. A pig tailed or soft straight multiperforated sterile drainage catheter is inserted over the wire and the wire removed. This allows rapid drainage and improved BP.

Take senior advice if available and transfer patient to cardiology centre as soon as possible. Drainage of large effusions, especially if chronic ones, must be evacuated very slowly; otherwise, there may be acute ventricular dilation or pulmonary oedema.

Complications: PTX, damage to myocardium, coronary vessels, arrhythmias, pulmonary oedema.

AICDs often function as a pacemaker, but can also deliver low-energy synchronised cardioversion and high-energy defibrillation shocks that successfully terminate 99% of ventricular fibrillation attacks. Indications are as follows (patient on chronic, best medical therapy and have a reasonable expectation of survival with good functional status for >1 y).

Level A evidence

LVEF ≤35% due to prior MI who are at least 40 days post-MI and NYHA Functional Class II or III.

LV dysfunction due to prior MI who are at least 40 days post-MI, LVEF ≤30%, and NYHA Functional Class I.

Survivors of cardiac arrest due to VF or haemodynamically unstable sustained VT after evaluation with reversible causes excluded.

Level B evidence

Non-ischaemic DCM who have an LVEF ≤35% and NYHA Functional Class II or III.

Non-sustained VT due to prior MI, LVEF <40%, and inducible VF or sustained VT at EPS (electrophysiological study).

Structural heart disease and spontaneous sustained VT, whether haemodynamically stable or unstable.

Syncope of undetermined origin with clinically relevant, haemodynamically significant sustained VT or VF induced at EPS.

Cardiac arrest with AICD: these patients are at high risk of cardiac arrest. If AICD senses a shockable rhythm it will fire a 40 J shock internally which may cause pectoral muscle contraction. Shocks to rescuers doing CPR are minimal, especially if wearing gloves. Generally produces a maximum of 8 possible discharges. Place shock pads away from AICD, e.g. antero-posterior: left precordium to below left scapula. A magnet placed over the AICD will disable any of its activity. Ask cardiology to deactivate in end of life care.

Patients with AICDs receiving shocks: those who have received shocks need a full assessment of their clinical status and device function. Shocks are a red flag for clinical events. Even if inappropriate there is a related increased mortality. Shocks are unpleasant, causing psychological distress, anxiety, and decreased quality of life. Catheter ablation of arrhythmias may be needed. Specialist assessment is needed.

Ongoing SVT/AF/VT with haemodynamic compromise: ignore presence of the AICD and treat. Consider external DC shock, IV amiodarone and/or beta-blockers (if haemodynamically tolerated). To shock avoid placement of paddles in the skin area over the AICD pocket. If possible, attempt an anterior–posterior electrode position.

Repetitive AICD shocks without a tachyarrhythmia or due to tachyarrhythmia (atrial or ventricular) that is haemodynamically well tolerated by the patient: place a magnet over the device to inhibit further shock delivery.

Contact with the patient during AICD discharge: is harmless but gloves (1–2) decrease conductivity and attenuate potential discomfort.

Choking usually when eating. Patient clutches neck/chest and unable to speak. Can be wheezing and stridor. May become unconscious. If conscious with airway obstruction give 5 back blows then 5 abdominal thrusts: if signs suggest mild airway obstruction then encourage coughing, but do nothing else. But if signs of severe airway obstruction and conscious then give up to five back blows. Stand to the side and slightly behind the patient. Support the chest with one hand and lean the victim well forwards so that when the obstructing object is dislodged it comes out of the mouth rather than goes further down the airway. Give up to five sharp blows between the shoulder blades with the heel of your other hand.

Check to see if each back blow has relieved the airway obstruction. If this fails, then give up to five abdominal thrusts. Stand behind the patient and put both arms round the upper part of his abdomen. Lean the victim forwards. Clench your fist and place it between the umbilicus and the bottom end of the sternum. Grasp this hand with your other hand and pull sharply inwards and upwards. Repeat up to five times. If the obstruction is still not relieved, continue alternating five back blows with five abdominal thrusts. If unconscious start CPR. Help the patient carefully to the ground. Call an ambulance immediately. Begin CPR. Those trained and experienced in feeling for a carotid pulse should initiate CPR even if a pulse is present in the unconscious choking victim.

Following successful treatment for choking, foreign material may nevertheless remain in the upper or lower respiratory tract and cause complications later. Patients with a persistent cough, difficulty swallowing, or with the sensation of an object being still stuck in the throat should therefore be referred for an immediate ENT opinion.

Adult choking algorithm.

Reproduced with permission from the Resuscitation Council (UK) 2015.

02   The acutely ill patient

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Introduction: Clinicians need to classify patients according to their needs to enable best possible care in the most appropriate part of the hospital. These have been designated as differing levels and you should know the terminology.

Level 0: Normal ward care in acute hospital, e.g. IV therapy. Observations less frequently than every 4 h.

Level 1: Patients at risk of deteriorating, or those recently relocated from higher levels of care, whose needs can be met on an acute ward with additional advice and support from the critical care team, e.g. observations more than every 4 h, tracheostomy, CVP line, chest drain, continuous infusion of insulin, PCA, post-op.

Level 2 (HDU): Patients requiring detailed observation or intervention including support for a single failing organ system or post-op care and those ‘stepping down’ from higher levels of care. Hourly monitoring, needing FiO2 >0.5 by face mask.

Level 3 (ITU): Patients requiring advanced respiratory support alone or basic respiratory support together with support of at least two organ systems. This level includes all complex patients requiring support for multi-organ failure.

The care delivered depends on several factors. These include the skills of the nurses predominantly and the skill mix, i.e. appropriately trained nurses, their seniority and the number of healthcare assistants available. The ratio of skilled staff to patients is fundamental in allowing time for the correct level of care and observation. When a patient is sick (i.e. there is need for one or more organ support – cardiac, renal, pulmonary, etc.) there is a need to move the patient to a level of care that is appropriate, which may mean moving them to the medical assessment unit (MAU) or to an HDU or ITU bed. For the latter two groups of patients it is good to involve critical care outreach as early as possible.

Studies have shown that those needing ITU have had major derangements in SaO2, HR, respiratory rate and BP many hours before escalation. The aim is to identify these patients and react in a more timely fashion to improve outcome. Sick patients are sliding metaphorically along an icy slope to the edge of the cliff over many hours and are potentially salvageable. Cardiac arrest patients have progressed and fallen off the cliff and hit the ground where resuscitation outcomes are so much worse.

Early warning scores provide a ‘track-and-trigger’ system to efficiently identify and respond to patients who present with or develop acute illness and to assess and manage using an ABCDE approach. The RCP has developed National Early Warning Scores (NEWS). There is also a recommendation that escalation communication uses the SBAR protocol. NEWS should be an aid and not a substitute for competent experienced clinical judgment.

*For patients with known Type 2 respiratory failure due to COPD, recommended BTS target saturations of 88–92% should be used. These patients will still ‘score’ if their O2 sats are below 92% unless the score is ‘reset’ by a competent clinical decision-maker and patient-specific target O2 saturations are prescribed and documented on the chart and in the clinical notes. Note that a high systolic BP does not score until it is 220 mmHg.

Low risk (0–4): should prompt assessment by a trained nurse who decides if a change to frequency of clinical monitoring or an escalation of clinical care is required.

Medium risk (5–6 or a RED score): needs an urgent review by a clinician competent to assess acute illness – ward-based doctor or acute team nurse, who can escalate to a team with critical care skills as required.

High risk (≥7): prompts emergency assessment by a clinical team/critical care outreach team with critical care competencies and there is usually transfer of the patient to a higher dependency care area.

Exceptions: extreme values in one physiological parameter (e.g. HR <40 bpm, or a RR <8 per min or temp <35°C) should not be ignored and on its own requires urgent clinical evaluation.

Reference: Royal College of Physicians (2012) National Early Warning Score (NEWS): Report of a working party. London: RCP.

While assessing ABCDE get help from nursing or other medical staff, work quickly to get IV access send bloods done, ABG and ECG and arrange a portable CXR, depending on the assessment. It is helpful if one can be the doing the tasks and the other can be thinking about what is going on and what needs to be done. In all emergencies, one person needs to be leading and thinking of the underlying diagnosis and management. Important signs of impending demise: increased HR, low HR, increased RR, low or falling BP, cold peripheries, oliguria or anuria, fall in GCS (coma) or new confusion, cyanosis, distress, silent chest.

Seeking help from seniors, peers or other disciplines is a key skill at all levels. Pre-call organisation is crucial. It depends on what time is available. If in extremis get the notes, observations and call quickly whilst others continue to manage the patient. If more time, get the notes and make a quick summary list of clinical details. Get lab results, imaging and pathology and make a summary note. Check notes, drug chart, fluid balance and observations charts and bring all of this to the phone with you. Know SaO2, BP, HR, FiO2, IV drugs and infusions.

What was premorbid state and the patient’s wishes? If the patient had stated they did not want intubation and ventilation for a chronic worsening lung condition then best to confirm this before calling ITU (ring the family if needed for baseline and other such information if you think it will alter the escalation decision). Personalising the case aids recall and makes the patient memorable, e.g. a 73 year old retired teacher. Use SBAR – see below.

Often A calls B and for some reason the line breaks down. B then tries to ring A whilst A tries to ring B with much confusion, frustration and time wasted. Have an agreed telephone policy, e.g. the initial caller alone must always try to re-establish the line. You will also at times be the recipient of phone calls. Those calling you will have different skills and experiences. If things just do not sound right, then you must go and see for yourself. If you can try to prioritise the call then do so. Tell the staff how long it will take you to attend, if possible. If you need an ECG then they can have this done for you by the time you arrive or have given PRN analgesia or other interventions that may help the situation.

SBAR communication tool

Situation: identify yourself and your role. Identify the name, age and sex of patient. What is the immediate concern to resolve or request? e.g. I need a CT head.

Background: explain clinical context. What has happened? Reason admitted. Main past medical history. Relevant medications, procedures, resus status, other input already taken. Relevant lab results. e.g. A 73 year retired schoolteacher on warfarin for AF fell and struck his head and is now drowsy with a GCS of 9. If the CT shows an SDH or ICH I will reverse anticoagulation immediately and refer to neurosurgeons.

Assessment: latest observations and NEWS. Bring the notes and observations charts and lab results to the phone with you. He now has a GCS of 9 which was 12 when seen in A&E. His INR was 4 on admission. Vitamin K and PCC have been given.

Recommendation: for nursing staff explain what you need – if you feel that patient needs to be seen now, or it can be dealt with in 20 min, or an hour. If it is an SHO/Registrar/ST calling a consultant, follow the above advice.

Discussion: a tracheostomy is a tube inserted directly into the trachea through which the patient can breathe or be mechanically ventilated. Insertion is beyond this text; only ongoing management and emergencies are covered here. Tracheostomies relieve upper airway obstruction and provide airway protection. They enable weaning from mechanical ventilation, to allow long-term ventilation and to provide assistance in removing respiratory tract secretions. Early post-insertion complications include haemorrhage, loss of the airway, blockage or complete or partial tracheostomy tube displacement.

Long-term complications include tracheomalacia, tracheal stenosis. The tube should be kept clean and secure. Key information is whether the patient has a patent upper airway, meaning that it is anatomically possible for the upper airway to connect to the trachea and thus allow ventilation by this route. Those with a laryngectomy and stoma do not have a patent upper airway. The following equipment should be immediately available for all patients with a tracheostomy in situ, regardless of which ward they are managed on. Self-inflating BVM, O2 with face-masks (non-rebreathing type) and tracheostomy masks, working suction and suction catheters, intubation equipment (including bougie) and a range of endotracheal tubes, laryngeal mask airway (LMA) device, dilating tracheostomy forceps, spare tracheostomy inner-tube appropriate for tracheostomy in place (i.e. dedicated to the patient and their tracheostomy). Staff should be competent in management of tracheostomy and complications.

If unwell and hypoxic then apply oxygen to face and mouth if patent upper airway. Laryngectomy patients have an end stoma and cannot be oxygenated via mouth or nose. All other patients should have oxygen applied to the face. Management of a blocked laryngectomy involves tracheal suction and intubation of the laryngeal stoma. Call arrest team and for anaesthetic support urgently if airway compromised. Assess patency, ABCDE approach as ever, consider passing suction catheter to see where blockage is and remove any debris.

References: National Tracheostomy Safety Project website, www.tracheostomy.org.uk/

Being able to quickly assess hydration is fundamental to managing disease. Clinical context is important as well as clinical signs. Patients on a general ward can have very poorly recorded I/O charts. Weight is very useful especially if you have been recording them on the admission or previous admissions. A litre of water is 1 kg. Rapid changes in weight are usually losses or gains of water.

Dehydration: sunken eyes, dry mouth and reduced skin turgor, complains of thirst. With time becomes obtunded. ↓BP, postural ↓BP, weak low volume pulse, ↑HR. Reduced body weight. ↓Urine output ↓urinary Na. ↑Hb, ↑urea more so than creatinine, hypernatraemia if free water loss. May be a cause e.g. vomiting, diarrhoea, obstructed fluid-filled bowel, polyuria, sweating, fistulae. CVP low. Fluid balance chart shows net loss (if accurate and all I/O recorded). Management is appropriate fluid replacement. Is it just water depletion or salt too and other electrolytes? Stop diuretics. Manage stomas or other losses.

Overhydration:↑JVP, gravitational dependent oedema, ascites, anasarca, breathless if CCF. Normal BP or hypertension, ↑HR if in CCF. Increased body weight. Normal/↑urine output and urine Na. Bloods normal unless pre-existing disease. Low Na possible. Evident cause e.g. ↑intake, liver/cardiac/renal failure/nephrotic syndrome. CVP raised. Fluid balance chart shows net gain (if accurate and all I/O recorded). Manage fluid restriction, diuretics. Match losses + 500 ml orally if possible.

Euvolaemic: warm, well filled. BP and HR normal. Body weight unchanged. Normal urine output. Normal I/O. Bloods normal.

Assessment

Examine for hypovolaemia. Seek help if still unsure (it can be difficult) about volume status especially when complex, e.g. where there is ongoing organ failure (e.g. cardiac/renal/liver) or sepsis, pyrexia and drains losing fluids.

Examine the notes – cause of admission, past history, procedures? Examine the chart – drugs, observations, pyrexia, BP, HR, urine output, output of drains, all of which should be stored within the fluid balance chart. What has preceded the assessment? Surgery, new drugs given?

Do not hang your diagnosis on one sign – the fluid balance chart may be badly completed, a ↑JVP might suggest RV infarction or a PE and a need for filling rather than overload, a CVP line may be blocked or erroneously measured, a BP might be recorded in an arm with atherosclerotic arteries and be misleadingly low so check other side. Healthy scepticism is always wise, especially when appearance of patient and signs don’t match.

Fluid losses may be hidden unless looked for, e.g. ascites and intestinal luminal or generalised oedema can contain significant fluid losses. During sepsis and inflammation increased fluid can be found in the interstitium and this depletes the circulating volume.

Other ways to assess fluid balance is measuring urine output, which is a crude measure of renal perfusion. Oliguria/anuria where there is no evidence of post renal obstruction suggests renal water and sodium retention and even incipient AKI. Many resort to using the JVP but this is not without its limitations and potential complications and should be reserved for the patient on HDU/ITU.

The physiological response to volume loss is the release of ADH and free water retention. There is sodium retention through the RAA mechanism. Stress/surgery and pain also cause cortisol and ADH release. The hypovolaemic patient is typically vasoconstricted with cold peripheries, mild ↑HR and dry mucous membranes, typically oliguric with a low urinary sodium.

Other losses: the values here are very rough with wide variation and generally all prescriptions of IV fluids must take into account renal/cardiac function, latest blood results, fluid balance status, drugs prescribed.

Gastrointestinal losses

Reviews for Acute Medicine, second edition

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