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Silent myocardial ischemia. How to diagnose? How to treat?
1Department of Internal Medicine, University of Zurich, Switzerland.
Insights
Diagnosing silent ischemia in asymptomatic patients is feasible with stress testing, especially in those with known coronary artery disease. This condition, whether symptomatic or not, impacts prognosis and may be treated with medication or procedures.
Area of Science:
- Cardiology
- Internal Medicine
- Diagnostic Testing
Background:
- Silent ischemia, a crucial indicator of coronary artery disease, presents diagnostic challenges in asymptomatic individuals.
- Understanding the prognostic implications of ischemic burden is vital for patient management.
Purpose of the Study:
- To outline diagnostic strategies for silent ischemia in patients with and without known coronary artery disease.
- To discuss the prognostic significance of ischemia and the impact of various treatments.
Main Methods:
- Utilizing stress testing for diagnosing silent ischemia in asymptomatic patients with established coronary artery disease.
- Employing 24-hour monitoring to quantify total ischemic burden and assess prognostic factors.
- Evaluating the role of risk factor assessment in selecting patients for stress testing when coronary artery disease is not documented.
Main Results:
- Stress testing effectively diagnoses silent ischemia in asymptomatic patients with known coronary artery disease.
- Identifying silent ischemia in asymptomatic patients without documented coronary artery disease is challenging, necessitating selective stress testing in high-risk individuals.
- Ischemia, both painful and painless, is an independent prognostic factor.
- Drug treatment can reduce ischemic burden, but its long-term prognostic impact requires further investigation through studies like TIBET and TIAP.
- Percutaneous transluminal coronary angioplasty (PTCA) can eliminate silent ischemia.
- Surgical treatment offers better survival than medical treatment for silent ischemia patients with three-vessel disease or impaired left ventricular function.
Conclusions:
- Stress testing is reliable for diagnosing silent ischemia in asymptomatic patients with known coronary artery disease.
- Selective stress testing is recommended for asymptomatic patients with multiple risk factors but no documented coronary artery disease, avoiding mass screening due to cost and false positives.
- Silent ischemia significantly impacts prognosis, and its management, including drug therapy and revascularization, is critical.
- Surgical intervention is associated with improved survival in specific subgroups of patients with silent ischemia.
Abstract:
1. The diagnosis of silent ischemia in asymptomatic patients with known coronary artery disease is adequately achieved by stress testing. 24 hour monitoring allows to assess the total ischemic burden which has prognostic implications. 2. The diagnosis of silent ischemia in asymptomatic patients without documented coronary artery disease is difficult. Stress testing should be carried out in selected patients with multiple risk factors. No mass screening by stress tests can be recommended because of the many false positive results and exorbitant costs. 3. Ischemia regardless whether painful or painless is an independent prognostic factor. 4. Drug treatment reduces or abolishes total ischemic burden. Its impact on prognosis is yet unknown but ongoing multicenter studies (TIBET, TIAP) might clarify the issue. 5. Successful PTCA can abolish silent ischemia. 6. In patients with silent ischemia, as in symptomatic patients, survival is better with surgical than with medical treatment in the presence of 3-vessel disease or reduced left ventricular function.