ostial lesion
Pronunciation: OSS-tee-al
Coronary stenosis located at the origin or opening of a vessel, requiring specialized intervention techniques.
Full Definition
Atherosclerotic narrowing occurring at the vessel ostium, typically within 3-5mm of the vessel origin from the aorta or parent vessel. Ostial lesions are technically challenging due to their location, tendency for elastic recoil, difficulty in achieving adequate stent coverage, and risk of compromise to adjacent vessels. The category includes both aorto-ostial lesions (arising from the aorta) and branch ostial lesions (at vessel bifurcations). These lesions often require precise stent positioning, aggressive predilation, and careful attention to avoid geographical miss or plaque shift into the parent vessel.
Usage
Usage note: Specify aorto-ostial versus branch ostial when relevant; maintain spacing in compound terms.
In Context
- "The aorto-ostial lesion required careful stent positioning to ensure complete coverage without protrusion." — Procedural description
- "Ostial lesions have higher rates of restenosis compared to mid-vessel stenoses." — Literature review