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[Preoperative evaluation of coronary circulation]
Insights
Preoperative assessment of coronary circulation is crucial for identifying high-risk patients before surgery. Various methods exist, but no single test offers 100% accuracy in predicting perioperative cardiac complications.
Area of Science:
- Cardiology
- Vascular Surgery
- Preoperative Assessment
Background:
- Defining a preoperative plan for coronary circulation assessment in vascular surgery is challenging due to contradictory studies and imperfect diagnostic methods.
- Accurate patient selection is vital to mitigate perioperative cardiac complications through reinforced medical treatment or anatomical correction.
- Initial assessment involves patient history, clinical examination, and basic tests like resting ECG and chest X-ray.
Purpose of the Study:
- To outline a strategic approach for preoperative coronary circulation assessment in patients undergoing vascular surgery.
- To identify patients at high risk for perioperative cardiac complications.
- To guide the selection of appropriate diagnostic tools based on patient risk factors and surgical demands.
Main Methods:
- Initial risk stratification using patient history, clinical examination, and resting ECG.
- Utilizing exercise ECG (Holter method) for patients unable to exercise.
- Employing dobutamine echocardiography when exercise testing is not feasible.
- Considering coronary angiography for patients with concerning findings from non-invasive tests.
Main Results:
- Low risk of complications in patients without Goldman risk factors or ischemic syndrome.
- Exercise ECG is valuable for potential coronary artery disease patients who cannot exercise.
- Dobutamine echocardiography demonstrates good sensitivity and specificity for assessing cardiac risk when exercise is contraindicated.
- Thallium-dipyridamole scanning's utility in vascular surgery requires further refinement, possibly through quantitative analysis.
Conclusions:
- A multi-faceted approach to preoperative coronary assessment is necessary, integrating clinical evaluation with targeted non-invasive testing.
- Patients with significant risk factors or concerning non-invasive test results warrant further investigation with coronary angiography.
- The goal is to optimize patient management and reduce the incidence of perioperative cardiac events in vascular surgery.
Abstract:
It is not easy to define a plan for the preoperative assessment of the coronary circulation: some studies carried out in the context of vascular surgery are contradictory and no method has a sensitivity and specificity of 100%. Nevertheless, it is essential to select patients with a high risk of perioperative cardiac complications so that their medical treatment can be reinforced or anatomical correction envisaged. A first assessment is obtained from the history, the clinical examination and simple investigations (resting ECG, chest X-ray). Surgical operations which do not impose a major strain on the cardiovascular system do not require further investigations. The risk of postoperative cardiac complications is low in the absence of the nine risk factors defined by Goldman and/or an ischemic syndrome (residual angina after mild physical activity, unstable angina, myocardial infarct). The problem arises in patients with the Goldman risk factors and/or a history of coronary insufficiency and/or coronary insufficiency risk factors (diabetes, tobacco, hypercholesterolemia, age > 70 years, arterial hypertension), who require an operation likely to cause a particularly serious strain on the cardiovascular system. An exercise ECG, by the Holter method, is helpful, particularly in known or potential coronary arteriopaths who cannot exercise. Echocardiography under dobutamine has good sensitivity and good specificity when exercise is impossible. Thallium-dipyridamole scanning has not been shown to be helpful in vascular surgery. This method could be refined by a quantitative analysis of the number of areas and segments involved. Finally, patients showing ischaemic changes on continuous ECG recording, abnormalities on echocardiography under dobutamine, abnormalities on thallium-dipyridamole myocardial scanning or on exercise ECG, should be considered for coronary angiography with a view to a preliminary anatomical correction.