Electrical activity of the heart

Dimension 0: Single Cells

APD Alternans

APD restitution curve and alternans.

$\begin{displaymath} APD_n +RT_n = BCL \end{displaymath}$ (1)

where
- is the Action Potential Duration;
- is the Recovery Time or Diastolic Interval;
- is the Basic Cycle Length.
If $APD_n = A(RT_{n-1})$ is the restitution curve, then

$\begin{displaymath} RT_n = BCL - A(RT_{n-1}). \end{displaymath}$ (2)

The APD map. (Animation)

$\begin{figure} \epsfxsize =2.5in \centerline {\epsffile{figs/restitution.eps}}\end{figure}$