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5 out of 6

Hyperkalemia occurs in which type of RTA? (LQ)

A Type I
B Type II

C Type IV
D All of the above

Ans. C Type IV

Type 4 (hyperkalemic)

a. RTA is due to "hyporeninemichypoaldosteronism".

b. Hypoaldosteronism causes hyperkalemiaand acidosis (impaired K+ & H+ excretion) (AIIMS Nov 07)

c. Causes: Mild renal impairment (eg with tubulointerstitial disease or DM), hypoadrenalism or drugs (K+ sparing diuretics, NSAIDs, ACEI).

d. Treatment Remove any cause. Fludrocortisone 0.1 mg PO, furosemide or calcium resonium are used to control hyperkalaemia.