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Table 1.

Action potential characteristics of atrial and ventricular muscle and the threshold voltage for the net inward current in atrial and ventricular myocytes of the rainbow trout heart

AtriumNVentricleN
Resting potential (mV) −83.29±0.45* 12 −81.54±0.39 12 
Action potential     
Amplitude (mV) 94.63±1.92* 12 88.67±1.01 12 
Overshoot (mV) 11.58±1.27 12 8.41±1.02 12 
APD at 0 mV (ms) 136.37±21.28* 12 363.13±31.23 12 
APD50 (ms) 306.39±4.81* 12 705.16±11.48 12 
Vmax (V s−120.19±1.18* 12 16.05±0.88 12 
Cell size (pF) 51.08±1.45 24 53.50±1.95 19 
Threshold voltage (mV) for the net inward current (HP=−82 mV) −48.75±1.80 12 −45.73±1.39 13 
Time constant (τ) 58.79±4.70* 10 7.14±0.68 16 
Input resistance (Mω) 1150.95±91.93* 10 133.46±12.62 16 
AtriumNVentricleN
Resting potential (mV) −83.29±0.45* 12 −81.54±0.39 12 
Action potential     
Amplitude (mV) 94.63±1.92* 12 88.67±1.01 12 
Overshoot (mV) 11.58±1.27 12 8.41±1.02 12 
APD at 0 mV (ms) 136.37±21.28* 12 363.13±31.23 12 
APD50 (ms) 306.39±4.81* 12 705.16±11.48 12 
Vmax (V s−120.19±1.18* 12 16.05±0.88 12 
Cell size (pF) 51.08±1.45 24 53.50±1.95 19 
Threshold voltage (mV) for the net inward current (HP=−82 mV) −48.75±1.80 12 −45.73±1.39 13 
Time constant (τ) 58.79±4.70* 10 7.14±0.68 16 
Input resistance (Mω) 1150.95±91.93* 10 133.46±12.62 16 

All experiments were conducted at 4°C. A statistically significant difference (P<0.05) between atrial and ventricular myocytes is indicated by an asterisk.

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