Tuesday, November 26, 2019

Concept Map: Thiazide induced hyponatremias(TAH)

We see this form of hyponatremia in several cases, but recently there has been some newer findings on the mechanisms of TAH(*).  In one study published in JCI in 2017, Ware et al showed that there is a subset of patients with a genetic baseline( SLCO2A1 mutation) decrease in prostaglandin(PGE) transport activity which then becomes a risk factor for TAH.  So these patients have increased urinary PGE2 and low AVP levels leading to a pure "nephrogenic" cause of tubular water absorption and dilution hyponatremia. PGE2 is critical in insertion and removal of AQP2 channels in the apical membrane. Increased PGE2 signaling leads to insertion of AQP2 channels into membrane and increase water absorption in an ADH independent manner. This is fascinating. Perhaps then mechanism in NSAIDS as well?
Check out this amazing review in AJKD on this topic. 

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