Comparative sensitivity of the exercise electrocardiogram, thallium imaging and stress radionuclide angiography to detect the presence and severity of coronary heart disease.

The relative sensitivity and specificity of individual and combined noninvasive tests to detect coronary heart disease were evaluated in 75 patients with chest pain admitted for cardiac catheterization and coronary arteriography. Of the 75 patients, 56 had coronary heart disease. Exercise-induced ST-segment ab- normalities (>1 mm) were found in 58%. In contrast, computer-processed exercise thalliuim-201 perfusion im- aging detected 82% (p < 0.01) and assessment of regional ejection fraction determined at rest and during isometric exercise by radionuclide angiography detected 82% (p < 0.02). Pathologic Q waves were present in 20%. Of nine patients with single-vessel disease, only one had exercise ST-segment abnormalities, while four had abnormalities in thallium-201 perfusion and five in regional ejection fraction. Of 16 patients with twovessel disease, 10 had ST-segment abnormalities, 14 had defects on thallium-201 imaging and 13 had abnor- malities in regional ejection fraction. Similarly, of 31 patients with three-vessel coronary heart disease, 23 had exercise-induced ST-segment changes, while 28 had thallium-201 perfusion defects and 28 had abnormalities in regional ejection fraction.