RELATION OF QUANTITATIVE CORONARY LESION MEASUREMENTS TO THE DEVELOPMENT OF EXERCISE-INDUCED ISCHEMIA ASSESSED BY EXERCISE ECHOCARDIOGRAPHY

To assess the relation of quantitative measures of coronary stenoses to the development of exercise-induced regional wall motion abnormalities, 34 patients with isolated, single vessel coronary artery lesions and normal wall motion at rest underwent exercise echocardiography and quantitative angiography on the same day. Although all 11 patients with a visually estimated stenosis ≥75% had an ischemic response and 10 (91%) of 11 patients with a ≤25% visually estimated stenosis had a normal response by exercise echocardiography, among 12 patients with a visually estimated stenosis of 50%, 6 (50%) had an ischemic response and 6 (50%) had a normal exercise echocardiogram. Quantitative measurements of stenosis severity distinguished patients with ischemic (group 1) from normal (group 2) exercise echocardiographic responses as follows: minimal luminal diameter (mm), group 11.0 ± 0.4 versus group 21.7 ± 0.4, p < 0.0001; minimal cross-sectional area (mm2), group 1 0.9 ± 0.6 versus group 2 2.5 ± 1.1, p < 0.0001; percent diameter stenosis, group 1 68.3 ± 14,2 versus group 2 42.2 ± 12.1, p < 0.0001; and percent area stenosis, group 1 87.5 ± 7.8 versus group 2 64.8 ± 15.9, p < 0.0001. These data validate the utility of exercise echocardiography by demonstrating that 1) coronary stenosis severity measured by quantitative angiography is closely related to wall motion abnormalities detected by exercise echocardiography, and 2) exercise echocardiography can be used as a noninvasive means to assess the physiologic significance of coronary artery lesions. (J Am Coll Cardiol 1990;15:1043-51). © 1990.