Renal artery stenosis (RAS) is a condition where one or both of the renal arteries become narrowed, which can lead to decreased blood flow to the kidneys. The most common culprits are atherosclerosis in older adults and fibromuscular dysplasia in younger people. When blood flow to the kidneys is reduced, it triggers the renin-angiotensin-aldosterone system, often causing secondary hypertension and, if left untreated, can lead to progressive kidney damage.
To diagnose RAS, doctors usually rely on imaging techniques like duplex ultrasound, CT angiography, MR angiography, or even invasive renal angiography. Treatment options may include medications to manage blood pressure, endovascular procedures such as angioplasty with or without stenting, or surgical revascularization in certain cases. Catching this condition early and treating it properly is crucial for maintaining kidney function, managing hypertension, and avoiding long-term cardiovascular issues.