Table 1.

Summary of AP Parameters in Superior and Inferior SAN Myocytes

	AP Frequency (Hz)	Coefficient of Variation of Inter–AP Interval	Maximum Diastolic Potential (mV)	Takeoff Potential (mV)	Early Diastolic Duration (ms)	Early Diastolic Depolarization Rate (mV/s)	AP Phase 0 Depolarization Rate (mV/ms)	AP Duration at 90% Repolarization (ms)
Superior	4.04 ± 0.36	0.46 ± 0.14	–56.88 ± 1.94	–36.051 ± 1.3	51.36 ± 11.36	83.80 ± 12.86	40.08 ± 8.32	51.56 ± 7.04
Inferior	1.44 ± 0.33	0.96 ± 0.18	–54.63 ± 5.54	–30.99 ± 7.38	325.09 ± 142.38	36.73 ± 7.93	29.67 ± 15.54	75.38 ± 20.65
t-test P-value	0.0005	0.0375	0.658	0.410	0.031	0.022	0.529	0.219