Table 1.

Dyssynchrony variables

TTP	Time-to-peak myocardial shortening: Time interval between the beginning of the QRS complex and peak of systolic shortening.
Max RV delay	Maximal right ventricular delay: Maximal time difference between longest and shortest TTP among the 6 RV segments.
RVDI	RV Dyssynchrony Index: SD of the 6 TTPs.
pET	Pre-ejection time: Time from Q-wave to the beginning of ejection, measured on pw-Doppler at ventricular outflow tract.
IVED	Interventricular ejection delay: Difference between LV-pET and RV-pET.
IVSD	Interventricular shortening delay: Maximal difference between longest and shortest TTP among the RV and LV free wall segments.

LV, left ventricular; SD, standard deviation.