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Cardiolucent

Condition

Renal Artery Stenosis

Evaluation and management of kidney artery narrowing and its blood pressure consequences.

Renal artery stenosis is narrowing of one or both arteries that supply the kidneys. It is most commonly caused by atherosclerosis in older patients and by fibromuscular dysplasia in younger patients, particularly women. The condition is a recognized cause of resistant hypertension, sudden worsening of previously controlled blood pressure, and progressive kidney dysfunction. Identifying renal artery stenosis matters because it changes management: certain antihypertensives are safer than others, and in selected patients revascularization can improve blood pressure and preserve kidney function. Dr. Kedan considers renal artery stenosis in patients with resistant or unusual hypertension and coordinates noninvasive imaging and intervention when needed.

What Cardiolucent Evaluates

  • Detailed hypertension history with attention to resistance, sudden worsening, or age at onset
  • Blood pressure with home and ambulatory monitoring
  • Renal function trends and electrolytes
  • Vascular Doppler studies of the renal arteries
  • CT or MR angiography when needed, coordinated with Cedars-Sinai
  • Medication review for contributors and for agents that may worsen kidney function in stenosis
  • Coordination with interventional cardiology or vascular surgery when revascularization is being considered

Common Symptoms

  • Often no specific symptoms attributable to the stenosis itself
  • Hypertension that is difficult to control with multiple medications
  • Sudden worsening of previously controlled blood pressure
  • Worsening kidney function, particularly when starting ACE inhibitors or ARBs
  • New onset hypertension in patients under 30 or over 55
  • Flash pulmonary edema episodes
  • Abdominal bruit on examination

Risk Factors

  • Atherosclerosis elsewhere (coronary, carotid, peripheral artery disease)
  • Age over 55 (atherosclerotic form)
  • Female sex and age under 50 (fibromuscular dysplasia)
  • Tobacco use
  • Diabetes
  • Hypertension and high cholesterol
  • Chronic kidney disease
  • Family history of vascular disease

How Cardiolucent Approaches Treatment

Most patients with atherosclerotic renal artery stenosis are managed medically: optimized antihypertensive therapy (often including an ACE inhibitor or ARB with careful kidney function monitoring), aggressive lipid lowering with high-intensity statin, antiplatelet therapy, glucose and lifestyle management, and tobacco cessation. Revascularization with stenting is reserved for specific situations such as recurrent flash pulmonary edema, refractory hypertension despite optimal medical therapy, or progressive kidney dysfunction with high-grade stenosis. Fibromuscular dysplasia often responds well to angioplasty. Dr. Kedan coordinates intervention with interventional cardiology or vascular surgery at Cedars-Sinai when indicated.

Common Questions

Frequently Asked Questions

What is renal artery stenosis?
Renal artery stenosis is narrowing of one or both arteries supplying the kidneys, most often from atherosclerotic plaque (older patients) or fibromuscular dysplasia (younger patients, often women). It can cause resistant hypertension and progressive kidney dysfunction.
When should renal artery stenosis be suspected?
Suspicion is raised by resistant or rapidly worsening hypertension, hypertension at unusually young or old ages, worsening kidney function after starting ACE inhibitors or ARBs, recurrent flash pulmonary edema, or a bruit heard over the abdomen. Dr. Kedan considers it actively in these scenarios.
How is it diagnosed?
Renal artery Doppler ultrasound is the most common screening test. CT or MR angiography provides more detailed anatomy when intervention is being considered. Invasive angiography is generally reserved for the time of treatment rather than diagnosis.
Does renal artery stenosis always need a stent?
No. Most patients are managed medically. Several major trials have shown that routine stenting in atherosclerotic renal artery stenosis does not provide meaningful benefit over optimal medical therapy. Stenting is reserved for specific situations like refractory hypertension despite multiple medications, recurrent flash pulmonary edema, or progressive kidney decline with high-grade stenosis.
Why are ACE inhibitors tricky in renal artery stenosis?
ACE inhibitors and ARBs reduce kidney blood flow downstream of the narrowed artery and can cause an acute decline in kidney function, particularly when stenosis affects both arteries or the artery to a single functioning kidney. They are not contraindicated in most cases of unilateral stenosis but require careful monitoring.
How is fibromuscular dysplasia different?
Fibromuscular dysplasia is a non-atherosclerotic vascular disease, more common in younger women, that often produces a characteristic 'string of beads' appearance on imaging. It generally responds well to balloon angioplasty alone, without stent placement in most cases, and the cure rate for hypertension is meaningful when intervention is appropriate.
How are blood pressure medications selected in renal artery stenosis?
ACE inhibitors and ARBs are often still used (with monitoring), along with calcium channel blockers, diuretics, and other agents as needed. Dr. Kedan tailors the regimen to your specific stenosis pattern, kidney function, and overall blood pressure profile.
What is fibromuscular dysplasia screening?
Patients with fibromuscular dysplasia in one vascular bed often have it in others. Once identified, screening of the carotid, vertebral, and other arteries is appropriate. Dr. Kedan coordinates this assessment with vascular medicine when indicated.
Will stenosis affect my long-term kidney function?
It can. Untreated severe stenosis can progressively impair kidney function, and the goal of management is to preserve as much function as possible while controlling blood pressure. Trends in kidney function over time guide decisions about escalation of therapy or intervention.
How do I schedule a consultation?
Call (310) 304-5555 or use the contact form to schedule with Dr. Kedan at the Beverly Hills office. Cardiolucent does not bill Medicare or insurance; a detailed superbill is provided for any out-of-network reimbursement.

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The information on this site is for general educational purposes only and is not medical advice, diagnosis, or treatment. Reading this site does not create a doctor–patient relationship. Always consult a qualified healthcare professional for personal guidance. If this is an emergency, call 911. Mentions of medications, devices, or procedures are informational and not endorsements. Full medical disclaimer.

†Some listed indications involve investigational/off-label use. Learn more.