Hemiarch Replacement
Pronunciation: HEM-ee-ark
Surgical procedure replacing the ascending aorta and proximal aortic arch while preserving the distal arch and brachiocephalic vessels.
Full Definition
A hemiarch replacement is a surgical technique used to treat aortic pathology affecting the ascending aorta and proximal arch. The procedure involves replacing only the ascending aorta and the lesser curvature of the aortic arch, typically under hypothermic circulatory arrest with selective cerebral perfusion. This approach is less extensive than total arch replacement and is indicated when the distal arch and brachiocephalic vessels are healthy. The procedure requires careful assessment of the extent of aortic disease to determine the appropriate level of arch replacement.
Usage
Usage note: Distinguish from total arch replacement, which involves complete arch reconstruction.
In Context
- "The patient underwent hemiarch replacement for acute type A aortic dissection with involvement limited to the proximal arch." — Operative report
- "Preoperative imaging demonstrated that a hemiarch replacement would be sufficient given the normal appearance of the distal arch." — Surgical planning note