What are causes and lab/urine findings for type IV RTA? What is the characteristic electrolyte finding?,”IMPAIRED CATION EXCHANGE. Addisonian syndrome results in impaired excretion of H+ and K+:1. DM (>50%)2. Addisons, spironolactone3. Interstitial nephritis (NSAIDs, ACEi, trimethoprim, heparin)HYPERKALEMIA due to defect in cation-exchange in distal tubule

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What are causes and lab/urine findings for type IV RTA? What is the characteristic electrolyte finding?,”IMPAIRED CATION EXCHANGE. Addisonian syndrome results in impaired excretion of H+ and K+:1. DM (>50%)2. Addisons, spironolactone3. Interstitial nephritis (NSAIDs, ACEi, trimethoprim, heparin)HYPERKALEMIA due to defect in cation-exchange in distal tubule

reduced secretion of H+ and K+.”