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Uptodate Reference Title
ECG left anterior fascicular block
ECG left anterior fascicular block
Sinus rhythm at 75 beats per minute. QRS duration is normal. Note the marked left axis deviation at about -60° consistent with left anterior fascicular block. As part of this pattern, qR is present in lead aVL along with terminal S waves in the lateral precordial leads. Slow R wave progression V1 through V3 is nondiagnostic.