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Table 1: Getting things together. |
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Depolarization vector main direction |
Bundle branch block |
Possible origin |
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Inferior or horizontal leftward axis, with a postero-anterior direction |
Left bundle branch |
Tricuspid annulus |
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Inferior axis with a leftward, center or rightwards precordial leads transition after V3 |
Left bundle branch |
Right ventricular outflow tract |
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Inferior axis with a leftward, center or rightwards axis, precordial leads transition prior to V3 |
Left bundle branch |
Aortic cusps |
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Superior vertical, right of leftwards axis |
Left bundle branch |
Moderator band |
|
Inferior or horizontal axis with a right wards deviation, negative V6 |
Right bundle branch |
Mitral annulus |
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Inferior left axis, monophasic S pattern V1 |
Right bundle branch |
Left ventricular summit |
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Superior right axis, negative V6 |
Right bundle branch |
Posterior fascicle or posterior-medial papillary muscle |
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Inferior right axis |
Right bundle branch |
Antero-lateral papillary muscle |
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Inferior left axis |
Right bundle branch |
Anterior fascicle |