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  • Title: [Spontaneous variability of ventricular extrasystole in chronic Chagas cardiopathy].
    Author: Grupi CJ, Sosa EA, De Carvalho JF, Antonelli RH, Bellotti G, Pileggi F.
    Journal: Arq Bras Cardiol; 1991 Jun; 56(6):445-50. PubMed ID: 1726676.
    Abstract:
    PURPOSE: To study the spontaneous variability of single (VPCs) and coupled (CVPCs) in patients with chronic Chagas' disease (CCD). PATIENTS AND METHODS: Twenty patients with CCD, 14 male, in class I and II NYHA, with frequent VPCs and VCPCs, free of drug therapy were studied. 21 hour Holter monitoring was done for 4 subsequent days. The data analysis assessed the variation in the frequency of VPCs and CVPCs between patients, seven hour periods one hour periods in a hierarchical model by a Poisson process. RESULTS: a) the frequency of VPCs follows a circadian rhythm, closely related to the hourly variations of the mean heart rate; b) disregarding the heart rate influence on the variability of the ventricular arrhythmia, its behavior was at random and unpredictable; c) the minimal percentual reduction in VPCs/h that discriminated between antiarrhythmic effect and spontaneous between antiarrhythmic effect and spontaneous between antiarrhythmic effect and spontaneous variability was 121.86% for seven-hour, 58.42% for 21-hour and 38.45% for 42-hour electrocardiographic monitoring periods; d) the same approach for the VCPCs revealed values of 133.6%, 63.21% and 41.3% respectively. CONCLUSION: The large variability of ventricular arrhythmia in CCD during a 24 hour period makes necessary observations always longer. The minimal percentual reduction in VPCs/h that discriminated between antiarrhythmic effect and spontaneous variability might be 58.42% for two 21-hour electrocardiography monitoring periods.
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