1) The mean age was 49.5±10.7 years(mean±SD)in subjects with normal coronary arteries and 53.1±8.8 years in patients with stenotic coronary arteries.

2) Fourteen patients had one-vessel disease, 10 two-vessel disease and 6 three-vessel disease.

3) Sensitivity of thallium myocardial scintigraphic imaging was higher than that of stress electrocardiography(86.7% vs 76.7%).

4) Specificity of both tests was same(70.6% vs 70.6%).

5) Sensitivity of thllium-201 stress myocardial scintigraphic imaging and stress electrocardigraphy in relation to the extent of coronary artery disease showed 78.6% vs 64.3% in one vessel disease, 90% vs 80% in two-vessel disease and 100% vs 100% in three-vessel disease.

6) Predictive value of thallium-201 stress myocardial scintigraphic imaging and stress electrocardiography revealed 83.9% vs 82% in the postive test and 75% vs 63.2% in the negative test.

In conclusion, even though thallium-201 stress myocardial scintigraphic imaging was superior to stress electrocardiography in diagnosing coronary artery disease, scintigraphic defects were noted in 5 subjects with normal coronary arteries which could mislead to erroneous diagnosis of coronary artery disease. This point should be taken into consideration in the interpretation of thallium-201 stress myocardial scintigraphic imaging.