Dr. Rupp is back! Today we talk about whether it's safe to give group 2 gadolinium based contrast agents to patients with CKD stage 4 and 5 and whether metoprolol can be used to prevent COPD exacerbations.  We also shine some more sunlight on the sunshine vitamin's inability to change any meaningful outcomes, and discuss some interesting data from the Intern Health Study. Risk of Nephrogenic Systemic Fibrosis in Patients with Stage 4 or 5 CKD Receiving Group II Gadolinium Based Contrast AgentMetoprolol for the Prevent of Acute Exacerbations of COPDEarly High-Dose Vitamin D3 for Critically Ill, Vitamin D-Deficient PatientsPolitical events and mood among young physiciansMusic from https://filmmusic.io"Sneaky Snitch" by Kevin MacLeod (https://incompetech.com)License: CC BY (http://creativecommons.org/licenses/by/4.0/)