### Abstract

Previous reports dealing with the dynamics of "pure" parasystole using mathematic and electronic (pacing-induced) models, respectively, showed that a number of predictions emerged naturally from mathematic analysis.^{1,2} Therefore, it appeared of interest to determine whether they would also apply to a series of patients with clinical (apparently) "pure" ventricular parasystole who were monitored for relatively long periods of time. In contrast to previous studies, Glass et al^{1} had the ingenious idea of analyzing the number of sinus beats interposed between 2 consecutive manifest parasytolic beats. They observed that, with the rates being practically constant, a detailed mathematic description could be made using 2 parameters: the ratio of ectopic cycle length to sinus cycle length and the ratio of ventricular refractory period to sinus cycle length. From a correlation of these parameters 3 basic rules emerged: (1) There are at most 3 different values for the number of sinus beats in between parasystolic beats. (2) Only 1 of these values is odd. (3) The sum of the 2 lesser values is 1 less than the larger value.

Original language | English |
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Pages (from-to) | 256-259 |

Number of pages | 4 |

Journal | The American journal of cardiology |

Volume | 68 |

Issue number | 2 |

DOIs | |

State | Published - Jul 15 1991 |

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### ASJC Scopus subject areas

- Cardiology and Cardiovascular Medicine

### Cite this

*The American journal of cardiology*,

*68*(2), 256-259. https://doi.org/10.1016/0002-9149(91)90756-B