ostial lesion
Pronunciation: OSS-tee-al
Atherosclerotic narrowing located at the origin or opening of a coronary artery or branch vessel.
Full Definition
An ostial lesion is an atherosclerotic stenosis located within 3 mm of the vessel origin, whether at the left main coronary artery ostium, right coronary artery ostium, or branch vessel origins. These lesions present unique technical challenges during intervention due to their location, often requiring special techniques such as precise stent positioning, aggressive pre-dilatation, or ostial optimization with high-pressure inflations. Ostial lesions have a higher propensity for elastic recoil and may require specific stent deployment strategies to ensure adequate coverage.
Usage
Usage note: Distinguish from 'proximal lesion' which may be further from the vessel origin. Specify vessel involved.
In Context
- "The right coronary artery ostial lesion required precise stent positioning to avoid protrusion into the aorta." — Interventional procedure report
- "High-pressure balloon inflation was performed to optimize the ostial lesion result." — Technical procedure note