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Preoperative evaluation of patients with peripheral vascular disease
1Section of Vascular Medicine and Hypertension, Lahey Clinic Medical Center, Burlington, Massachusetts.
Insights
Patients undergoing vascular procedures face high cardiac event risks. Thallium imaging identifies those needing coronary artery bypass surgery before vascular operations to improve survival.
Area of Science:
- Cardiology
- Vascular Surgery
- Medical Imaging
Background:
- Coronary artery disease significantly impacts survival post-vascular revascularization.
- Cardiac events are a primary cause of mortality following abdominal aortic aneurysm and peripheral vascular disease procedures.
- Current practices may not adequately screen for cardiac risks before vascular surgery.
Purpose of the Study:
- To evaluate the efficacy of thallium myocardial perfusion imaging in identifying patients at high risk for cardiac events before vascular surgery.
- To determine the optimal strategy for managing patients with coronary artery disease undergoing elective vascular revascularization.
Main Methods:
- Retrospective analysis of patients undergoing vascular revascularization.
- Utilizing thallium myocardial perfusion imaging to assess cardiac risk.
- Correlating imaging findings with subsequent cardiac events and survival rates.
- Selective use of coronary angiography based on thallium scan results.
Main Results:
- Thallium imaging effectively identifies patients with significant coronary artery disease.
- Abnormal perfusion scans (multiple defects or lung uptake) indicate high cardiac risk.
- Patients with severe, correctable coronary artery disease benefit from preoperative coronary artery bypass surgery.
- This approach can reduce subsequent cardiac events and improve late survival.
Conclusions:
- Thallium myocardial perfusion imaging is a valuable tool for preoperative cardiac risk stratification in vascular surgery patients.
- Selective coronary angiography and bypass surgery, guided by thallium imaging, can optimize outcomes for high-risk individuals.
- This strategy aims to mitigate the leading cause of death after major vascular procedures.
Abstract:
Coronary artery disease is the leading cause of death after revascularization procedures for abdominal aortic aneurysms and peripheral vascular disease. Late survival after vascular procedures is substantially reduced, largely by the high incidence of subsequent cardiac events. At the Lahey Clinic, it is not our practice to perform routine coronary angiography before elective revascularization. Thallium myocardial perfusion imaging should be performed in all patients before operation. Abnormal results on thallium exercise scanning showing multiple perfusion abnormalities or lung uptake at peak exercise identify patients who are candidates for preoperative cardiac catheterization. When severe correctable coronary artery disease is identified, these patients should be considered for coronary artery bypass surgery before vascular operation.