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Cardiac Action Potential Parameters

APA
V or mV
Action Potential Amplitude, voltage difference between RMP and APO
APD10
s or ms
Action Potential Duration 10%, time taken to polarise from APO to APO - (0.1 * APA)
APD20
s or ms
Action Potential Duration 20%, time taken to polarise from APO to APO - (0.2 * APA)
APD30
s or ms
Action Potential Duration 30%, time taken to polarise from APO to APO - (0.3 * APA)
APD50
s or ms
Action Potential Duration 50%, time taken to polarise from APO to APO - (0.5 * APA)
APD90
s or ms
Action Potential Duration 90%, time taken to polarise from APO to APO - (0.9 * APA)
APO
V or mV
Action Potential Overshoot, peak potential
dVdtMax
V/s
Max rate of rise of upstroke
Freq
Hz
Pulse generator output frequency, if active
RMP
V or mV
Resting Membrane Potential, voltage immediately before stimulation
t_dVdtMax
s or ms
Time of  max rate of rise of upstroke, measured from upstroke start
tAP
s or ms
Action potential time from upstroke to return to RMP
tCon
s or ms
Conduction time, time between stimulation pulse and upstroke

 

 

(c) EMMS