Action Potential Analysis Module

The purpose of the Action Potential (MAP) Analysis Module is to compute physiologic parameters from action potential data. The graph above represents a typical action potential signal and its derivative as they would appear on the monitor.  Automated validation marks for Upstroke (EDV), Maximum Slope Mark, Peak, Plateau and Recovery Marks are shown.  The validation marks provide visual, real-time verification of the accuracy of the system.

The list below describes the parameters calculated by the analysis module either in real-time or during subsequent analysis.

Model PNM-MAP100W

Name		Definition
Num		The number of the cardiac cycle.
Max		The Maximum Voltage that occurred during a cardiac cycle.
EDV		The voltage prior to the upstroke of the action potential.
Min		The minimum voltage that occurred during a cardiac cycle.
Plto		The plateau voltage.
Amp		PLTO minus EDV.
Rate		The beats-per-minute.
+dV		The maximum positive rate of change that occurred.
-dV		The maximum negative rate of change that occurred.
REC1		The time, in milliseconds, from the beginning of the upstroke of the action potential, to the point where the signal drops below the level corresponding to the % Recovery 1 level.
xR1		The number of cycles that did not reach the % Recovery 1 level, within the logging period.
REC2		The time, in milliseconds, from the beginning of the upstroke of the action potential, to the point where the signal drops below the level corresponding to the % Recovery 2 level.
xR2		The number of cycles that did not reach the % Recovery 2 level, within the logging period.
REC3		The time, in milliseconds, from the beginning of the upstroke of the action potential, to the point where the signal drops below the level corresponding to the % Recovery 3 level.
xR3		The number of cycles that did not reach the % Recovery 3 level, within the logging period.
%Max		The time, in milliseconds, from the beginning of the upstroke of the action potential, to the point where the signal recovers to 100% or as close to 100% as possible.
Time		The time interval between action potentials.
Cnt		The number of cycles in the logging period.
RiseT		The time, in milliseconds, between the EDV and Max points.