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[Should silent ischemia be diagnosed and treated?]
1Klinisk fysiologisk/nuklearmedicinsk afdeling, Amtssygehuset i Herlev.
Insights
Silent myocardial ischemia, often found in heart disease patients, shows objective signs without symptoms. Its prognostic impact varies, and while treatable, its effect on prognosis remains under investigation.
Area of Science:
- Cardiology
- Internal Medicine
Context:
- Silent myocardial ischemia is common in patients with ischemic heart disease, including those with angina pectoris or prior myocardial infarction.
- Diagnosis can be achieved through conventional exercise testing or ambulatory Holter monitoring.
- The underlying mechanisms causing symptomatic versus asymptomatic ischemia are not fully understood.
Purpose:
- To discuss the phenomenon of silent myocardial ischemia.
- To explore potential mechanisms behind symptomatic versus asymptomatic ischemia.
- To review the prognostic implications and treatment options for silent ischemia.
Summary:
- Silent myocardial ischemia, characterized by objective signs of ischemia without symptoms, is frequently observed in patients with ischemic heart disease.
- Both symptomatic and asymptomatic ischemia are associated with impaired left ventricular function, particularly reduced ejection fraction during exercise.
- Prognostic significance of silent ischemia varies across patient groups, and its impact on prognosis with current treatments is still under investigation.
Impact:
- Silent ischemia can be managed with antianginal medications or revascularization procedures.
- Further research is ongoing to determine if treating silent ischemia can improve patient outcomes.
- Understanding silent ischemia is crucial for risk stratification and management of patients with ischemic heart disease.
Abstract:
Silent ischaemia (objective signs of myocardial ischaemia without symptoms) can be diagnosed using a conventional exercise-test or ambulatory Holter monitoring. Silent ischaemia is a frequent phenomenon in patients with ischaemic heart disease, i.e. patients with angina pectoris or previous myocardial infarction. The reason why ischaemia is symptomatic in some cases, and asymptomatic in others is unknown. Different possible mechanisms are discussed. Myocardial ischaemia, symptomatic or not is accompanied by a compromised function of the left ventricle, including reduced ejection fraction during exercise. In selected groups of patients, silent ischaemia is related to an impaired prognosis, while it does not seem to carry any prognostic information in other groups of patients. Silent ischaemia can be treated/reduced using antianginal medication or revascularization, but for the time being it is not known if treatment can improve prognosis. Studies concerning the latter are under way.