A computerized system for modeling pacemaker rhythms.

We have developed a computer program which simulates a paced cardiac rhythm strip, graphically generating the electrocardiogram (ECG) on a color monitor. Any pacemaker, programmed as desired, dynamically interacts with a preselected intrinsic rhythm. Utilizing symbols prevalent in the pacing industry, this graphics-oriented, interactive system promotes a rapid understanding of pacemaker function by automatically superimposing specific pacemaker events on a rhythm strip. These events include: pacemaker spikes, evoked cardiac depolarization waveforms, refractory periods, upper rate intervals, and blanking periods. Applications of this program include interpreting and verifying appropriate pacemaker function, demonstrating idiosyncrasies of the various pacemakers, and teaching.