The authors compared the value of two non-invasive methods in the diagnosis of myocardial ischaemia, i.e. precordial working maps of the ST segment and working scintigraphy of the myocardium with 201T1 after a load. On comparison with the finding on the coronary arteries, the authors found a high sensitivity of mapping, 89.3%, and of 201T1 scan, 92.9%, while the specificity of both methods was lower, 57.1%. Both methods are equally valuable for diagnosis of myocardial ischaemia; for assessment of the site of affection thallium scintigraphy of the myocardium is preferable.
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