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A representative case of type B mismatching in the interventricular septum. A 64 year old female patient showed complete right bundle branch block. Short axis and horizontal images with 123I BMIPP and thallium-201 SPECT show type B mismatching in the intraventricular septum (arrowheads). Since this patient showed a decrease in exercise capacity and an increase in the cardiothoracic ratio from 52% to 57% during the follow up period, treatment with β blockade was begun.
