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Background and purpose: The most usual way for diagnosing left ventricular systolic dysfunction (LVSD) is Ëchocardiography. We designed this propective study for evaluating the rate of association of left bundle branch block (LBBB) with LVSD(ËF< 50%).
Materials and methods: Ôut of 2522 Patients admitted to the cardiology ward in Tmam Khomeini Hospital, 215 Patients had LBBB, of whom 200 patients had been evaluated by Ëchocardiography. LBBB was diagnosed by the ËÇG criteria QRS > 0.12 sec, the existence of notch or slurring in QRS with a primary R wave in Ï, aVL and the left pericardial lead and the changing of ST and T segment in a way often against the primary QRS. Ëchocardiography was performed by cardiologist who was unaware of this study with a wing med 750 echocardiogram.
Results: Ôut of 200 patients with LBBB only 10% had ËF> 50% and 90% of patients with LBBB in ËÇG showed LVSD in Ëchocardiography. ËF was< 30% in 25.5%, 30-40% in 33% and between 40-50% in 31.5% of the patients.
Çonclusion: The presence of LBBB in ËÇG is associated frequently with LVSD in Ëchocardiography.

Keywords: Left Bundle Branch Block, systolic function, electrocardiography, echocardiography

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