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Left bundle branch block(LBBB),traditionally viewed as an electrophysiologic abnormality,is increasingly recognized for its effects on hemodynamics and patient’s prognosis[1].Exercise nuclear studies frequently show reversible perfusion defects in the absence of obstructive coronary artery disease[2] and some patients with intermittent LBBB develop angina coincident with the onset of LBBB[3].We report a case of intermittent LBBB with abnormal stress technetium 99m Tc single-photon emission computed tomography(SPECT) study and normal coronary artery angiography.
Left bundle branch block (LBBB), traditionally viewed as an electrophysiologic abnormality, is increasingly recognized for its effects on hemodynamics and patient’s prognosis [1]. Exercise in nuclear studies frequently show reversible perfusion defects in the absence of obstructive coronary artery disease [2] and some patients with intermittent LBBB develop angina coincident with the onset of LBBB [3] .We report a case of intermittent LBBB with abnormal stress technetium 99m Tc single-photon emission computed tomography (SPECT) study and normal coronary artery angiography.