Table 1. Action potential characteristics of single GFP+ and GFP− cells.
GFP+ cells (n = 6) | GFP− cells (n = 8) | |
cycle length (ms) | 377±58 | – |
MDP (mV) | −65.0±3.0 | −79.0±1.6* |
DDR50 (mV/s) | 63.4±16.8 | – |
dV/dtmax (V/s) | 7.3±2.6 | 112±14* |
APA (mV) | 78.5±7.5 | 98.2±3.5* |
APD20 (ms) | 48.1±6.5 | 12.5±2.6* |
APD50 (ms) | 71.1±8.6 | 35.8±2.8* |
APD90 (ms) | 100.0±13.3 | 82.5±10.7 |
Data are mean±SEM; n = number of cells, MDP = maximal diastolic potential, DDR50 = diastolic depolarization rate over the 50-ms time interval starting at MDP+1 mV, dV/dtmax = maximal upstroke velocity, APA = action potential amplitude, APD20, APD50, and APD90 = action potential duration at 20, 50, and 90% repolarization. *p<0.05.