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      Analysis of Exercise-Induced R-Wave-Amplitude Changes in Detection of Coronary Artery Disease in Patients with Typical or Atypical Chest Pain under Digitalis Treatment

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          Specificity and sensitivity of exercise ECG were compared to exercise stress thallium 201 scanning and coronary arteriograms in 70 male patients with typical or atypical chest pain complaints, without previous myocardial infarction. 50 patients (group I) did not receive any treatment; 20 patients (group II) received digitalis as preventive treatment of atrial arrythmias or for no particular reason. Only subjects with concordant results in radionuclide and angiography examinations were considered as coronary artery disease patients. Exercise stress tests were performed sitting on the bicycle ergometer using a progressive loading profile (30 W for 3 min), to the symptom-limited capacity (VO<sub>2</sub> SL). Positive exercise ECG were confirmed on ST decrease (1.5 mm) or on absence or increase in R-wave-amplitude modifications (V5). In the group I patients, ECG-ST-modification sensitivity, specificity, predictive value (+) and efficiency were, respectively, 92, 82, 86 and 88%. R-wave-variation sensitivity, specificity, predictive value (+) and efficiency were, respectively, 41, 74, 65 and 56%. In the group II patients, ST-depression sensitivity, specificity, predictive value (+) and efficiency were, respectively, 100, 33, 59 and 65%. R-wave-variation sensitivity, specificity, predictive value (+) and efficiency were, respectively, 50, 70, 63 and 60%. It was concluded that R-wave-amplitude variations induced lower false positive responses than ST-segment depression in patients under digitalis treatment. False negative responses were unfortunately 50% using the R-wave criterion. Erercise ECG was finally judged as a poor indicator of CAD in patients under digitalis treatment.

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          Author and article information

          S. Karger AG
          07 November 2008
          : 68
          : Suppl 2
          : 178-185
          Medical Cardiology (S. Degre), Nuclear Medicine (A. Schoutens) and Radiology Departments (J. Struyven), Hôpital Académique Erasme, Université Libre de Bruxelles, Belgium
          173334 Cardiology 1981;68:178–185
          © 1981 S. Karger AG, Basel

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          Page count
          Pages: 8
          Drug Effect

          General medicine, Neurology, Cardiovascular Medicine, Internal medicine, Nephrology

          Digitalis, Exercise, CHD, ECG


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