Poststenotic Dilatation

Post-stenotic dilatation of greater than 20% is commonly seen with severely stenotic renal arteries [31]. The association between significant renal artery stenosis causing post-stenotic fusiform aneurysm and hypertension can be attributed to activation of the renin-angiotensin system, with increased angiotensin II levels resulting in fluid retention and vasoconstriction. Also when the renal artery lumen narrows, blood flow accelerates to maintain the same volume flow across a narrower cross sectional area. This accelerated jet flow tends to impact a spot on the artery wall distal to the stenosis, eventually producing post-stenotic dilatation. It may not be present in stenoses that are so severe that only a weak jet can make it through the stenosis.

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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