Table 1.

Animal experiments (n = 12)

Mode of pacing	QRSd (ms)	SI (ms)	LV dP/dtmax (mmHg/s)	Td (ms)
AAI (narrow QRS)	70 ± 2 †	141 ± 8 †	1483 ± 85 †	95 ± 2 †
AAI (LBBB)	110 ± 3	247 ± 9 ‡ , §	1115 ± 95	125 ± 2
DDD (RV)	110 ± 3	265 ± 10 ‡ , §	1103 ± 99	129 ± 2 ‡
DDD (LV)	103 ± 2	214 ± 6	1161 ± 78	119 ± 2
DDD (BIV)	87 ± 2 †	192 ± 7	1232 ± 84 (P = 0.08)	113 ± 2 †

AP, atrial pace; AP‐LBBB, atrial pace with left bundle branch block; BIVP, biventricular pace; LVP, left ventricular pace; QRSd, QRS duration; RVP, right ventricular pace; SI, synchronicity Index; Td, time‐to‐peak LV dP/dt.

Electrophysiological and mechanical characteristics. The top five rows are compared (n = 12).

^† P < 0.05 compared with all.

^‡ P < 0.05 compared with LVP.

^§ P < 0.05 compared with BIVP.