Abstract
Exercise thallium-201 imaging is of limited diagnostic accuracy in patients with left bundle branch block (LBBB), because decreased septal activity often occurs in the absence of left anterior descending artery disease. 1–3 A combination of tachycardia, shortened diastolic relaxation time and asynchronous contraction are considered to be responsible for this phenomenon. 1,2 Recently, it has been suggested that dipyridamole thallium-201 scintigraphy significantly improves specificity in patients with LBBB by assessing coronary flow reserve at lower heart rates. 4 Relatively few patients in the latter report, however, had angiographic correlation. Accordingly, this study compares this technique with angiographic findings in a larger group of patients with LBBB at rest.
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