ACE inhibitors can precipitate acute kidney injury, severe hyperkalemia, and hypotension in patients with bilateral renal artery stenosis due to loss of angiotensin II–mediated efferent arteriolar constriction.
ACE inhibitors are contraindicated in untreated bilateral renal artery stenosis.
A rise in creatinine >30% after starting therapy signals unsafe interaction.
Hyperkalemia can develop rapidly; monitor K⁺ closely.
Revascularization may allow safe ACE‑I use, but only after specialist assessment.
In bilateral renal artery stenosis, renal perfusion pressure is already reduced. ACE inhibitors block the conversion of angiotensin I to angiotensin II, eliminating angiotensin II–driven efferent arteriole constriction that maintains glomerular filtration pressure. The resulting drop in glomerular filtration pressure leads to a rapid rise in serum creatinine and possible renal failure. Additionally, reduced aldosterone secretion promotes potassium retention, increasing hyperkalemia risk.
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