![]() However, due to the specialized equipment and personnel involved, echocardiographic and radionuclide studies are expensive and often not readily available. These additional tests provide independent diagnostic data that are used to augment the interpretation of the exercise tolerance test. Therefore, the exercise tolerance test is often performed in conjunction with echocardiographic or radionuclide studies. ![]() To improve the diagnostic accuracy of the exercise tolerance test, it is useful to use diagnostic parameters in addition to ST segment displacement. The diagnostic accuracy of the 12-lead ECG exercise test has important limitations, including the confounding presence of left ventricular hypertrophy and reduced performance in women. The standard 12-lead electrocardiography (ECG) exercise tolerance or stress test is a commonly used procedure for detecting the presence of coronary artery disease (CAD). The disjunctive combination of the S4 and ST depression had sensitivity/specificity of 68%/84%.ĬONCLUSION: In this preliminary pilot study, the use of acoustic cardiography alone during ETT or disjunctively with ST depression has been shown to be a simple and convenient method for the detection of CAD, which was superior to ST depression on the standardized ECG. Sensitivity/specificity of ST segment depression in the group was 29%/92%, whereas the most powerful acoustic cardiographic parameter was the strength of the fourth heart sound (S4), with corresponding sensitivity/specificity of 53%/92%. RESULTS: Thirty-four of the 59 adult subjects (58%) had a final diagnosis of CAD by angiography, and in 25 subjects, CAD was excluded by angiography. ![]() A standard, symptom-limited, 12-lead ECG exercise tolerance test was performed by independent persons with simultaneous acoustic cardiography and subsequent cardiac angiography for determination of significant CAD. Measurements included sensitivity, specificity, likelihood ratios and receiver operating characteristic curves. METHODS: We conducted an explorative study with retrospective data analysis using a convenience sample of consecutive patients ( n = 59, mean age: 62 years) from an outpatient clinic in Switzerland, who were referred for ETT by their general practitioner on suspicion of CAD, and in whom, coronary angiography was carried out. ![]() AIM: To assess if performance of 12-lead exercise tolerance testing (ETT) can be improved by simultaneous acoustic cardiography and to compare the diagnostic performances of electrocardiography (ECG) during ETT and acoustic cardiography for detection or exclusion of angiographically proven coronary artery disease (CAD). ![]()
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