Which medication class is associated with hyperkalemia?

Which medication class is associated with hyperkalemia?

• A. ACE inhibitors
• B. Thiazide diuretics
• C. Calcium channel blockers
• D. Beta blockers

Answer: (A)

Medications that interfere with the renin-angiotensin-aldosterone system commonly raise potassium levels because they reduce aldosterone-driven potassium excretion in the distal nephron. ACE inhibitors block the conversion of angiotensin I to angiotensin II, which lowers angiotensin II–stimulated aldosterone release from the adrenal glands. With less aldosterone, the collecting duct and late distal tubule excrete less potassium, so potassium accumulates in the blood. This effect is more pronounced in people with kidney impairment, those taking other potassium-sparing drugs, or those with conditions that already raise potassium. Thiazide diuretics, in contrast, promote potassium loss in the distal tubule, so they tend to cause hypokalemia rather than hyperkalemia. Calcium channel blockers do not typically cause significant potassium changes. Beta blockers can sometimes cause mild hyperkalemia by reducing cellular uptake of potassium, but the classic and most consistent association with hyperkalemia is ACE inhibitors.

Medications that interfere with the renin-angiotensin-aldosterone system commonly raise potassium levels because they reduce aldosterone-driven potassium excretion in the distal nephron. ACE inhibitors block the conversion of angiotensin I to angiotensin II, which lowers angiotensin II–stimulated aldosterone release from the adrenal glands. With less aldosterone, the collecting duct and late distal tubule excrete less potassium, so potassium accumulates in the blood. This effect is more pronounced in people with kidney impairment, those taking other potassium-sparing drugs, or those with conditions that already raise potassium.

Thiazide diuretics, in contrast, promote potassium loss in the distal tubule, so they tend to cause hypokalemia rather than hyperkalemia. Calcium channel blockers do not typically cause significant potassium changes. Beta blockers can sometimes cause mild hyperkalemia by reducing cellular uptake of potassium, but the classic and most consistent association with hyperkalemia is ACE inhibitors.