Table 1.
Action potential parameters of rat sino-atrial node cells
| Groups | n | Overshoot(mV) | MDP(mV) | Amplitude(mV) | 50% duration(ms) | Upstroke velocity(V s−1) | Beat rate(min−1) |
|---|---|---|---|---|---|---|---|
| A | 5 | 14.8 ± 10.8 | −57.6 ± 7.6 | 72.5 ± 17.9 | 73.9 ± 16.4 | 4.4 ± 3.9 | 214 ± 58 |
| B | 7 | 19.6 ± 5.7 | −53.0 ± 7.0 | 72.5 ± 9.6 | 95.3 ± 29.7 | 2.4 ± 1.2 | 165 ± 28 |
A, parameters of rat cells showing If. B, parameters of cells of rats which did not show If. MDP, maximum diastolic potential. Values are the means ±s.d. No significant differences were found between groups A and B.