What is considered a risk factor for acute saphenous vein graft closure after CABG?

Hypotension is indeed considered a significant risk factor for acute saphenous vein graft closure after coronary artery bypass grafting (CABG) procedures. This is primarily due to the critical role that adequate perfusion pressure plays in maintaining blood flow through the grafts. When blood pressure is low, it can result in inadequate perfusion of the grafts, which may lead to thrombosis and eventual closure.

Inadequate blood flow can compromise the graft's integrity and function, making it less likely to remain patent. Hypotension can occur due to a variety of reasons, including intraoperative complications or poor cardiac output. Therefore, maintaining stable hemodynamics, particularly adequate blood pressure, is crucial for preventing acute graft closure and ensuring the success of the CABG procedure.

Other parameters such as hypothermia or low platelet counts, while they may have implications for surgical outcomes, do not have the same direct and immediate effect on graft patency as hypotension does.