Altered LV excitation from fascicular lesions refines conduction block diagnosis; leaves open prospective validation of ECG criteria and outcomes.
have considered that the fibres of the left bundle-branch may be thought of as being arranged into superior and inferior divisions. If a lesion involves a sufficiently large number of fibres of one radiation, the sequence of excitation of the left ventricle is altered. The electrocardiographic patterns of the left superior intraventricular block (Grant, 1956; Pryor and Blount, 1966) and of the left inferior intraventricular block (Pryor and Blount, 1966) have been described.
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Kulbertus et al. (1969) studied this question.
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