Figure: ECG left bundle branch block

Introduction

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59 yrs     Female     BP 150/78                192 lb

PR:  147
QRS: 145      Normal sinus rhythm @ 83/min
QT:  438      Left bundle branch block.    QRS > 120 mS. Terminal forces left.
QTc: 515

 Axes
P:
QRS: 118
T:   210

Courtesy of Kerala Serio, M.D. UCSF Fresno.