hemiarch replacement
Pronunciation: /ˈhɛmiɑːrtʃ/
A surgical procedure involving replacement of the ascending aorta and partial aortic arch, typically including the lesser curvature. Preserves the arch vessels while addressing proximal pathology.
Full Definition
Hemiarch replacement is a surgical technique that involves replacement of the ascending aorta extending into the lesser curvature of the aortic arch, while preserving the native arch vessels and their origins. This approach is used when the pathology extends beyond the sinotubular junction but does not involve the entire arch. The procedure typically includes reimplantation of the innominate artery and may require brief periods of circulatory arrest. It represents a compromise between complete arch replacement and isolated ascending aortic replacement, offering adequate treatment while minimizing operative complexity and neurologic risk.
Usage
Usage note: Clearly distinguish the extent from total arch replacement in operative planning and reports.
In Context
- "Hemiarch replacement was performed with reimplantation of the innominate artery." — Surgical case presentation
- "The tear extended to Zone 1, requiring hemiarch rather than isolated ascending replacement." — Operative planning note