Table 1.

Hemodynamics with atrial-only pacing and early activation of the LV site with atrioventricular pacing

		Atrial-Only Pacing		Atrioventricular Pacing		Restoration of Atrial-Only Pacing
	Baseline	30 min	60 min	90 min	120 min	150 min	180 min	210 min	240 min
LV pressures
Peak pressure, mmHg	112 ± 6	108 ± 5	110 ± 6	109 ± 6	107 ± 5	110 ± 3	112 ± 3	110 ± 2	110 ± 3
LV end-diastolic pressure, mmHg	9 ± 1	8 ± 1	8 ± 1	9 ± 2	10 ± 2	9 ± 2	9 ± 3	9 ± 2	10 ± 2
Peak positive dP/dt, mmHg/s	1,383 ± 105	1,285 ± 121	1,294 ± 113	1,275 ± 151	1,312 ± 138	1,344 ± 111	1,308 ± 119	1,296 ± 108	1,321 ± 103
Peak negative dP/dt, mmHg/s	1,924 ± 124	1,954 ± 131	1,908 ± 138	1,868 ± 153	1,906 ± 144	1,874 ± 133	1,860 ± 142	1,902 ± 120	1,881 ± 132
Arterial pressures, mmHg
Systolic pressure	112 ± 7	106 ± 6	109 ± 6	109 ± 6	108 ± 7	112 ± 4	112 ± 3	108 ± 3	108 ± 4
Diastolic pressure	81 ± 7	78 ± 6	82 ± 5	80 ± 8	82 ± 7	83 ± 7	84 ± 6	84 ± 7	81 ± 5
Mean pressure	94 ± 6	90 ± 8	92 ± 7	90 ± 8	90 ± 7	95 ± 6	94 ± 6	92 ± 7	89 ± 6
Pulmonary arterial pressures, mmHg
Systolic pressure	17 ± 2	16 ± 3	18 ± 1	16 ± 2	17 ± 3	18 ± 3	17 ± 3	18 ± 3	18 ± 2
Diastolic pressure	13 ± 3	13 ± 2	13 ± 2	13 ± 1	11 ± 4	13 ± 2	13 ± 2	12 ± 3	13 ± 3
Mean pressure	15 ± 3	14 ± 2	16 ± 2	14 ± 2	13 ± 3	14 ± 3	14 ± 3	14 ± 3	15 ± 2
Pulmonary capillary wedge pressure	10 ± 2	9 ± 1	7 ± 1	8 ± 1	9 ± 2	9 ± 2	10 ± 2	10 ± 2	9 ± 1
Cardiac output, l/min	3.1 ± 0.5	2.9 ± 0.4	3.0 ± 0.6	2.9 ± 0.6	2.9 ± 0.8	3.2 ± 0.6	2.9 ± 0.5	3.1 ± 0.5	3.0 ± 0.6

Values are presented as means ± SE. LV, left ventricular.