This is one of the more complex questions in anaesthesia! Here's the actual WHO definition that doesn't use the term morbid obesity but rather obesity class 1, 2 and 3.Obesity is frequently subdivided into categories:Class 1: BMI of 30 to < 35Class 2: BMI of 35 to < 40Class 3: BMI of 40 or higher. Class 3 obesity is sometimes categorized as “extreme” or “severe” obesity.NB LISTEN TO NEXT EPISODE FOR DEEP DIVE INTO  THE EFFECT OF CARDIAC OUTPUT ON WASHOUT!!!Millers Chapter 20 Inhaled Anesthetic Uptake, Distribution, Metabolism, and Toxicity Section: Recovery from Anesthesia and figures 20.4 and 20.5 show FASTER washout with LOW cardiacs output.This is also referenced by the ex chair of first part exam at the primary LO website. This chapter also has good graphs to replicate for the exam.Please rate, post a review and subscribe!Check out www.anaesthesiacollective.com and sign up to the ABCs of Anaesthesia facebook group https://www.facebook.com/groups/2082807131964430and check out the ABCs of Anaesthesia YouTube channel for more contenthttps://www.youtube.com/c/ABCsofAnaesthesiaAny questions please email Lahiruandstan@gmail.com  Disclaimer: The information contained in this podcast is for medical practitioner education only. It is not and will not be relevant for the general public.This contains general information about medical conditions and treatments. The information is not advice and should not be treated as such. The medical information is provided “as is” without any representations or warranties, express or implied. The presenter makes no representations or warranties in relation to the medical information on this video. You must not rely on the information as an alternative to assessing and managing your patient with your treating team and consultant.You should seek your own advice from your medical practitioner in relation to any of the topics discussed in this episode’ Medical information can change rapidly, and the author/s make all reasonable attempts to provide accurate information at the time of filming. There is no guarantee that the information will be accurate at the time of viewing The information provided is within the scope of a specialist anaesthetist (FANZCA) working in Australia. The information presented here does not represent the views of any hospital or ANZCA. These podcasts are solely for training and education of medical practitioners, and are not an advertisement. They were not sponsored and offer no discounts, gifts or other inducements. This disclaimer was created based on a Contractology template available at http://www.contractology.com.