Evaluation of seasonal variation in cardiac conductive disorders leading to permanent pacemaker implantation in the North-West Provinces of Iran

Abstract

Objective: To evaluate seasonal variation in cardiac conductive disorders leading to permanent pacemaker (PPM) implantation. Patients and Methods: Conductive disorders of all patients who had implanted cardiac pacemakers during years 2005-2006 were evaluated. All conduction disorders in atrial and atrioventricular node were included. Statistical analysis was done by SPSS version 13. Results: 341 patients, 197 males and 144 females with mean age of 64.9آ±12 and 69.5آ±14 years were included in the study. Incidence of conductive disorders (CD) was significantly lower in summer and autumn with 154 (45.2%) episodes than winter and spring with 187 (54.8%) episodes (P=0.007). High incidence of CD in winter and spring was seen more often in females. Conclusion: Incidence of CD which leads to PPM implantation was higher in winter and spring than other seasons. Lower incidence in males with CD in these seasons may implicate etiologies other than infectious disease.