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[Atrial pacing in the evaluation of coronary disease]
Insights
Atrial pacing effectively diagnoses myocardial ischemia by inducing ECG changes and chest pain. This diagnostic test is a valuable alternative for patients unable to complete stress tests.
Area of Science:
- Cardiology
- Diagnostic Medicine
- Ischemic Heart Disease
Context:
- Myocardial ischemia diagnosis often relies on stress testing, which can be challenging for some patients.
- Coronary angiography is invasive and typically used for confirmation rather than initial diagnosis.
- Atrial pacing offers a potential non-invasive method to provoke ischemic symptoms under controlled conditions.
Purpose:
- To evaluate the diagnostic accuracy of atrial pacing in identifying myocardial ischemia.
- To compare the efficacy of atrial pacing with coronary angiography findings.
- To determine if atrial pacing can serve as an alternative diagnostic tool for patients with contraindications to stress testing.
Summary:
- Twenty-three patients underwent coronary angiography and atrial pacing. Pacing induced electrocardiographic changes (ST depression) and/or anginal pain at incremental frequencies up to 160/min.
- The atrial pacing test was positive in 94% of patients with significant coronary artery disease (17/18) and negative in 80% of those without (4/5).
- Clinical and ECG abnormalities during atrial pacing accurately indicated myocardial ischemia, demonstrating high sensitivity and specificity.
Impact:
- Atrial pacing is a reliable indicator for diagnosing myocardial ischemia.
- This method provides a useful alternative diagnostic strategy for patients unable to undergo conventional stress tests.
- The findings support the integration of atrial pacing into the diagnostic algorithm for suspected ischemic heart disease.
Abstract:
In order to assess the value of atrial pacing in the diagnosis of myocardial ischemia, 23 patients (mean age 53 +/- 8 years), submitted to coronary angiography, were studied. Atrial Pacing at incremental frequencies was performed until the appearance of electrocardiographic changes (ST segment depression) and/or typical anginal pain. The highest frequency of stimulation was 160/min. The test was negative in four of five patients (80%) without significant obstructive coronary artery disease. Atrial pacing test was positive in 17 of 18 patients (94%) with abnormal angiography. The authors concluded that clinical and ECG abnormalities induced by atrial pacing seems to be correct indicators for the diagnosis of myocardial ischemia. This test can be an useful alternative in patients unable to perform a conclusive stress test.