[en] Myocardial scintigraphy was applied in the evaluation of the effectivity of systemic or intracoronary thrombolytic therapy. Scintigraphy was carried out on the second or third day of the thrombolytic therapy. 500 MBq sup(99m)Tc-pyrophosphate was administered iv. and 90-120 minutes later images were taken from three directions. The results of the scintigraphy were compared to those of ECG and enzyme analysis. Assessed on the basis of the three diagnostic methods, intracoronary thrombolysis proved to be successful in 3 out of 10 cases, systemic thrombolysis in 10 out of 28 cases. Myocardial scintigraphy gave 4 false negative results but no false positive result was obtained, thus the sensitity of the diagnostic procedure was 84%, and the specificity 100%. (L.E.)