Table 1.

Animal characteristics and atrial paced function

	Body Weight, kg	LVV0, ml	LVV0/HW, ml/g	RR, ms	LVEDP, mmHg	dP/dtmax, mmHg/s	Stroke Volume, ml	Ejection Fraction, %
Nonfailing	25 ± 4	24 ± 3	0.15 ± 0.01	550 ± 9	8.5 ± 2.4	3,902 ± 632	28.2 ± 3.5	54.5 ± 4.5
Failing	19 ± 1*	43 ± 5†	0.27 ± 0.01†	472 ± 19†	15.8 ± 0.8†	1,972 ± 309†	9.3 ± 1.5†	22.7 ± 3.7†

Values are means ± SE; n = 5 (nonfailing) and 6 (failing). LVV₀, left ventricular (LV) unloaded volume; HW, heart weight; RR, R-R interval; LVEDP, LV end-diastolic pressure; dP/dt_max, maximum rate of LV pressure change.

^*P < 0.01, failing vs. nonfailing;

^†P < 0.05, failing vs. nonfailing (comparisons between groups were performed with a Student's t-test).