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Roger Rodby Profile picture
Roger Rodby
@NephRodby
Academic nephrology, gardening, golfing, biking, not necessarily in that order. Rush Fellow. Prg. Dir.
May 5, 2022 • 17 tweets • 5 min read
55 y/o found unresponsive at train stop. 911 to ED, he wakes up a bit, slumps over and says he lost vision in one of his eyes. Follow the case with me. Some of this is very simple, some not so (all values in mg/dl, mmol/l etc). @RushIMChiefs @RushTweetorials @RushDOIM. Image 2) ABG on admission pH 7.14 PCO2 15 PO2 90 HCO3 5.2. What is the acid base status? pH low HCO3 low = met acid. Is compensation? In met acid PCO2 ⬇️, PCO2 15 so yes. Is degree appropriate? Winter’s formula for Met Acid: PCO2 = 1.5XHCO3+8 = 15.8, so yes compensation is appropriate
Mar 26, 2021 • 11 tweets • 16 min read
@KidneyAide @sbABetterLeader @AnnaGaddy @IUKidney @hswapnil Quick tutorial on oral urea. Urea is used for hypoNa bc urea excretion requires H20 excretion (without Na) and thus ⬆️ electrolyte free water clearance (EFWC) which ⬆️ [PNa] in pts with ⬇️ EFWC (most commonly SIADH). @KidneyAide @sbABetterLeader @AnnaGaddy @IUKidney @hswapnil 2) Urea has a molecular weight of 60 (60 gram/mole = 1000 millimoles and urea has no charge so that is 1000 milli-osmoles/mole (mosm/mole)). The commercial products are sold as 15gm units (1/4 of a mole) = 250 mosm.