Table 1.

Percentages of LPS activation patterns for SAN gradient model 1 (concentric) under [ACh]bath, heterogeneous cholinergic stimulation, and variation

	[ACh], nM			ACh Regions			Peripheral (gCa,L), %
Pattern	80	40	20	1–3	1–4	1–5	150	100	50
Caudal shift	92.9	82.3	61.5	84.9	89.3	64.8	73.3	82.4	85.7
Double breakout	6.06	9.73	8.79	8.22	4.10	13.0	13.71	5.88	2.60
No effect	1.01	8.00	29.7	6.85	6.56	22.2	12.9	11.8	11.7

LPS, leading pacemaker site; SAN, sinoatrial node; [ACh], acetylcholine concentration.