The preejection phase should be included when assessing LV dyssynchrony, as leftward preejection motion of the septum during LBBB is mainly a result of active septal contraction.
Preejection septal motion warrants consideration in LV dyssynchrony assessment; hypothesis-generating for CRT selection, with prospective validation needed.
Leftward preejection motion of the septum during LBBB is mainly a result of active septal contraction, whereas alterations in diastolic ventricular pressures modulate the amplitude of this motion. The findings imply that the preejection phase should be included when assessing LV dyssynchrony.
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Gjesdal et al. (2011) studied this question.
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