Today we have a special guest, Dr. Joel Topf, board-certified nephrologist and medical educator extraordinaire. Our listeners will likely recognize Dr. Topf from his prolific tweeting @Kidney_boy, as well as his numerous appearances on the Curbsiders podcast. He is a co-founder of the NephJC on Twitter, and host and founder of the NephJC podcast Freely Filtered. He is also host of the podcast Channel Your Enthusiasm, a deep dive monthly recap of the nephrology textbook Clinical Physiology of Acid Base and Electrolyte Disorders by Dr. Burton Rose (who, incidentally, is the creator of the original UpToDate). Dr. Topf wrote his own book on fluids, electrolytes and acid-base homeostasis.  He's the co-editor for the fourth edition of Nephrology Secrets and the first edition of The Handbook of Critical Care Nephrology. Dr. Topf joined us to talk about a new paper he co-authored on osmotic demyelination syndrome and hyponatremia. I'm also joined by Dr. Mita Hoppenfeld, hospitalist at the University of Utah, to talk about a new DOAC vs warfarin trial in On-X aortic valves, whether it's better to avoid hypertension or hypotension around time of surgery, and the diagnostic accuracy of CT abdomen scans without contrast. Check it out! Osmotic Demyelination and Hyponatremia Apixaban vs Warfarin for On-X Aortic Valve Perioperative Blood Pressure Strategies Diagnostic Accuracy of CT Abdomen Without Contrast Music from Uppbeat (free for Creators!): https://uppbeat.io/t/soundroll/dope License code: NP8HLP5WKGKXFW2R