Renal Artery Stenosis: Secondary Hypertension

Creator: Progress Note
Published: 2026-09-03
Keywords: renal artery stenosis, renal artery stenosis, secondary hypertension, fibromuscular dysplasia, RAAS activation, renal artery stenosis ACE inhibitor

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check_circleRenal artery stenosis reduces renal perfusion and activates the renin-angiotensin system.
check_circleIt is a treatable cause of secondary hypertension.
check_circleAtherosclerosis causes it in older adults; fibromuscular dysplasia in younger women.
check_circleA sharp creatinine rise after starting an ACE inhibitor or ARB is a classic clue.
check_circleManagement includes RAAS-based blood pressure control and, in selected cases, revascularization.

Causes

Two main processes cause renal artery stenosis. Atherosclerosis accounts for most cases, typically in older adults with other vascular risk factors, and usually involves the proximal renal artery. Fibromuscular dysplasia is a non-atherosclerotic thickening of the arterial wall that classically affects younger women, involves the mid-to-distal artery, and can give a "string of beads" appearance on imaging.

Pathophysiology

Reduced perfusion to the affected kidney is sensed as low volume, triggering renin release and activation of the renin-angiotensin-aldosterone system. The resulting angiotensin II and aldosterone raise blood pressure and cause sodium retention. Because the stenotic kidney depends on angiotensin II to maintain its filtration pressure (through efferent arteriolar constriction), blocking that system can sharply reduce its function.

Clinical Clues and Diagnosis

Suspect renal artery stenosis with hypertension that is severe, resistant, or of very early or late onset, with an abdominal bruit, or with recurrent flash pulmonary edema. A hallmark clue is an acute rise in creatinine after starting an ACE inhibitor or ARB, especially with bilateral disease. Diagnosis uses noninvasive imaging — duplex ultrasound, CT angiography, or MR angiography — with catheter angiography as the definitive study.

Treatment

Medical therapy is the foundation: control blood pressure and cardiovascular risk, often using an ACE inhibitor or ARB (with careful monitoring of renal function, and caution in bilateral disease). Revascularization by angioplasty and stenting is reserved for selected patients, such as those with refractory hypertension, deteriorating kidney function, or recurrent flash pulmonary edema; angioplasty is particularly effective in fibromuscular dysplasia.

Frequently asked questions

What causes renal artery stenosis?expand_more

The two main causes are atherosclerosis, which affects older adults and typically involves the proximal renal artery, and fibromuscular dysplasia, which classically affects younger women and involves the mid-to-distal artery with a "string of beads" appearance.

Why does creatinine rise with ACE inhibitors in renal artery stenosis?expand_more

The kidney affected by renal artery stenosis relies on angiotensin II to constrict the efferent arteriole and maintain filtration pressure. ACE inhibitors and ARBs block angiotensin II, dropping that pressure and causing a sharp rise in creatinine, especially in bilateral disease — a classic diagnostic clue.

How is renal artery stenosis diagnosed?expand_more

Diagnosis uses noninvasive imaging such as duplex ultrasound, CT angiography, or MR angiography, with catheter angiography as the definitive test. It is suspected with resistant or early/late-onset hypertension, an abdominal bruit, or an ACE-inhibitor-induced creatinine rise.

How is renal artery stenosis treated?expand_more

Treatment centers on medical management of blood pressure and cardiovascular risk, often with an ACE inhibitor or ARB and careful monitoring. Angioplasty with stenting is reserved for selected patients with refractory hypertension, worsening kidney function, or recurrent flash pulmonary edema, and works especially well in fibromuscular dysplasia.

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