BoardsBridgeOpen Aortic Cross-Clamp Release in AAA Repair
Anesthesia management for controlled reperfusion after aortic declamping — preload, vasopressor prep, staged release.
Release of the aortic cross-clamp during open AAA repair causes acute hypotension from washout of ischemic metabolites, sudden ↓ afterload, and pooling in reperfused lower extremities — preload, vasopressor prep, and staged release prevent cardiovascular collapse.
If you forget
PRELOAD: Bolus 500 mL crystalloid or colloid BEFORE releasing the clamp (mitigates central hypovolemia).
Board trap
Key numbers
- 500 mL crystalloid or colloid bolus PRIOR to clamp release (SVS 2022).
- Aortic cross-clamp time > 60 min → up to 27% spinal cord ischemia incidence.
- MAP target after release: within 20% of pre-clamp baseline.
- Calcium chloride 1 g IV for ECG changes of hyperkalemia from ischemic limb washout; may repeat if changes persist.
- Phenylephrine 50–100 mcg bolus or norepinephrine infusion 4–8 mcg/min titrated to MAP.
Uri Rozen, MD — Licensed Physician, Israel
Source guidelines: SVS Perioperative Vascular Care 2022 · SVS Perioperative Vascular Care 2022 · AAA Spinal Cord Ischemia 2022
Re-review cadence: 12 months from reviewed date.
Related on BoardsBridge
Card ID: open-cross-clamp-release · Path: aba.vascular.aaa-open.open-cross-clamp-release