With ventricular conduction defects, the pathway of excitation through the heart is unusual and inefficient. The electrical wavefront follows a different, often slower path through one bundle at a time and through the ventricular muscle. The result of this slower, roundabout path is seen as a wider than normal QRS complex coded as 7-codes.
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(2010). Intraventricular Conduction Defects (7-Codes). In: The Minnesota Code Manual of Electrocardiographic Findings. Springer, London. https://doi.org/10.1007/978-1-84882-778-3_9
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