ostial lesion
A stenosis located at the origin or mouth of a coronary artery or major branch vessel.
Full Definition
An ostial lesion is a coronary stenosis located within 3mm of the vessel origin or ostium, presenting unique technical challenges for interventional treatment. These lesions are classified as aorto-ostial (involving the left main or right coronary artery origins from the aorta) or non-aorto-ostial (involving branch vessel origins). Ostial lesions are typically fibrotic and calcified, making them resistant to balloon dilation and prone to elastic recoil. They require specific interventional techniques including aggressive pre-dilation, precise stent positioning to avoid geographical miss, and often higher deployment pressures. The rigid nature of ostial lesions means they may not respond well to balloon angioplasty alone.
Usage
Usage note: Specify whether aorto-ostial or branch ostial when documenting.
In Context
- "The aorto-ostial right coronary artery lesion required careful stent positioning to ensure adequate coverage." — Interventional procedure report
- "Ostial lesions of the left anterior descending artery often demonstrate elastic recoil following balloon angioplasty." — Educational material