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Technical
IVT
zone 0
The most proximal landing zone for thoracic endografts, extending from the aortic valve to the brachiocephalic artery origin.
Full Definition
Zone 0 represents the ascending aorta and aortic root in the Ishimaru classification system for thoracic endograft landing zones. Deployment in zone 0 requires coverage of all arch vessels, necessitating surgical debranching or fenestrated/branched endografts. This zone is typically reserved for hybrid procedures due to the complexity of maintaining cerebral and upper extremity perfusion.
Usage
Usage note: Part of standardized zone classification; distinguish from Roman numeral zones (I, II, III, IV).
In Context
- "The extent of the aneurysm required zone 0 deployment with complete arch vessel debranching." — Operative report
- "Zone 0 endograft placement carries the highest risk of stroke due to arch vessel manipulation." — Risk assessment
Also known as
proximal landing zone 0
Don't confuse with
zone I
zone II