Table 1.

Dorsal horn neurons

	Chest	Heart	IVC	AOC	LAD	VF
Increasing rate, pulses/s
Baseline	4.1 ± 2.6	5.1 ± 3.8	2.0 ± 0.75	1.9 ± 0.58	2.2 ± 0.44	1.0 ± 0.56
During	6.6 ± 4.3*	5.4 ± 3.9*	3.6 ± 1.2*	2.7 ± 0.76*	3.6 ± 1.2*	2.4 ± 0.94*
Unresponsive, pulses/s
Baseline/during	0.0006 ± 0.0005	0.002 ± 0.002	0.002 ± 0.001	0.0008 ± 0.0005	0.004 ± 0.002	0.0008 ± 0.0006
Decreasing rate, pulses/s
Baseline	4.7 ± 2.4	2.8 ± 2.3	4.3 ± 0.85	4.7 ± 2.4	4.8 ± 2.5	3.2 ± 1.2
During	2.9 ± 1.5*	2.5 ± 2.2*	2.4 ± 0.54*	3.2 ± 1.6*	2.5 ± 0.63*	1.7 ± 0.75*

Values are means ± SE. Average pulses per second for dorsal horn neurons that increased, were unresponsive, or decreased firing rate during somatic (Chest, chest scratch), mechanical (Heart, heart touch), cardiac load (IVC, inferior vena cava occlusion; AOC, aortic occlusion), ischemic (LAD, left anterior descending coronary artery ligation), or ventricular fibrillation (VF) stimulation.

^*P < 0.03 vs. baseline.