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Surgical revascularization for acute total occlusion of left main coronary artery
1The Department of Surgery, National Taiwan University Hospital, Taipei, Republic of China.
Insights
Emergency surgical revascularization effectively treated cardiogenic shock from acute left main coronary artery occlusion. Prompt intervention, mechanical support, and collateral circulation improved survival rates in these critical cases.
Area of Science:
- Cardiology
- Cardiovascular Surgery
- Emergency Medicine
Background:
- Acute total occlusion of the left main coronary artery is a rare but catastrophic event.
- Cardiogenic shock resulting from this condition carries a high mortality rate.
- Limited data exist on the efficacy of emergency surgical revascularization in this setting.
Observation:
- This study reports on 3 patients experiencing cardiogenic shock due to acute left main coronary artery occlusion.
- Two patients required extracorporeal membrane oxygenation (ECMO) preoperatively due to profound shock.
- One patient received inotropic support and intra-aortic balloon pump (IABP) due to favorable collateral circulation.
Findings:
- All patients underwent surgical revascularization within 20 hours of occlusion.
- Two patients survived, with one requiring 5 days of postoperative ECMO.
- The third patient, despite initial ECMO weaning, succumbed to hypoxic encephalopathy.
Implications:
- Emergency surgical revascularization can be an effective treatment for acute left main coronary artery occlusion-induced cardiogenic shock.
- Factors contributing to survival include prompt revascularization (<20 hours), mechanical circulatory support (e.g., ECMO), and adequate collateral circulation.
- Early surgical intervention is crucial for improving left ventricular function and patient outcomes in this critical condition.
Abstract:
We report our experience with emergency surgical revascularization in 3 patients who were in cardiogenic shock as a result of acute total occlusion of the left main coronary artery. Because they were in profound shock, 2 patients required mechanical support with extracorporeal membrane oxygenation before the operation. Another patient was given moderate inotropic support and treated with an intraaortic balloon pump before surgery, because he had a dominant right coronary artery with extensive collateral circulation to the left coronary artery. All 3 patients underwent surgical revascularization within 20 hours of acute occlusion. Two patients survived, although 1 of them required extracorporeal membrane oxygenation support for 5 days postoperatively. The 3rd patient, despite successful weaning from extracorporeal membrane oxygenation immediately after coronary revascularization, died of hypoxic encephalopathy due to prolonged preoperative resuscitation. Immediate surgical revascularization was an effective treatment in our 3 patients who were in cardiogenic shock due to acute total occlusion of the left main coronary artery. Such factors as abundant collateral vessels from the right coronary artery to the left coronary artery, complete surgical revascularization within 20 hours of acute occlusion, and mechanical circulatory support were deemed important to recovery of left ventricular function. Two of our 3 patients survived.