Related Experiment Videos
[Preoperative evaluation of coronary circulation]
Insights
Identifying patients at high risk for cardiac events is crucial. This involves assessing coronary circulation using various tests to guide treatment or myocardial revascularization before surgery.
Area of Science:
- Cardiology
- Vascular Surgery
- Anesthesiology
Context:
- Assessing coronary circulation preoperatively is challenging due to controversial studies and imperfect diagnostic tests.
- Identifying patients with high perioperative cardiac event risk is essential for treatment intensification or myocardial revascularization.
Purpose:
- To define a strategic approach for coronary circulation assessment in patients undergoing surgery.
- To identify patients at high risk for perioperative cardiac events.
Summary:
- Initial assessment includes history, physical exam, and basic tests (ECG, chest X-ray).
- For patients with risk factors (Goldman criteria, diabetes, smoking, hypertension) or coronary artery disease, further evaluation is needed.
- Tests like Holter monitoring, stress testing, dobutamine stress echocardiography, and dipyridamole-thallium scintigraphy aid risk stratification.
- Coronary angiography may be indicated for patients with significant abnormalities to consider myocardial revascularization before surgery.
Impact:
- Facilitates informed decisions regarding medical treatment intensification or myocardial revascularization.
- Aims to reduce perioperative cardiac events and improve patient outcomes in high-risk surgical candidates.
- Provides a framework for optimizing preoperative cardiac risk assessment and management strategies.
Abstract:
To define a strategy for coronary circulation assessment is a difficult task as most of the studies have been carried out in vascular surgery, as some of them are controversial, and as no test has a 100% sensitivity and specificity. However patients with high perioperative risk of cardiac events have to be identified, in order to intensify medical treatment or to consider myocardial revascularisation. A first evaluation is based on history, physical examination and simple tests, such as rest electrocardiogram and thorax X-Ray. Additional tests are not required when surgery does not elicit a major activity of the cardiocirculatory system. Postoperative cardiac risk is low when none of the nine risk factors defined by Goldman and/or coronary insufficiency (residual angina elicited by minor physical activity, unstable angina, myocardial infarction) are present. The problem remains in patients with Goldman risk factors and/or at risk of coronary artery disease because of diabetes mellitus, heavy smoking, hypercholesterolaemia, arterial hypertension, undergoing major abdominal, thoracic or vascular surgery. Preoperative electrocardiographic Holter monitoring is still of value, especially in patients with known or supposed ischaemic heart disease and unable to make a physical effort. A poor exercise capacity and changes in electrocardiographic stress testing are factors of poor prognosis. The dobutamine stress echocardiography has a good sensitivity and specificity when an effort test cannot be performed. The value of dipyridamole-thallium 201 scintigraphy could be improved by a quantitative analysis of the number of affected segments and territories. Patients with angina or ischaemic episodes on continuous electrocardiogram, or with dobutamine echocardiography kinetic disturbances and with stress myocardic scintigraphy or stress exercise testing abnormalities could undergo a coronarography, in order to consider myocardic revascularization prior to surgery.