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International Journal of Recent Trends in Science and Technology, ISSN 2277-2812 E-ISSN: 2249-8109
Volume 16, Issue 1, Aug 2015 pp 37-39
Comparative study of RR, PR and JT intervals during the different phases of menstrual cycle
Rajeshwari L*, Uma R**, A R Gorkal***
*Associate Professor, **Lecturer, ***Professor, Department of Physiology, JSS Medical college and Hospital, JSS University, SS Nagar, Mysuru, Karnataka, INDIA.
Aim: Cardiac functions are influenced by gender and gonadal steroids. Ventricular arrhythmias are more common in women and seem to exhibit during the menstrual cycle. JT interval is major component of QT interval. It measures ventricular repolarization. According to literature, estrogen lengthens the JT interval. Hormonal changes during menstrual cycle may cause changes in ECG intervals. Objective: The objective of the present study is to evaluate the effect of different phases of menstrual cycle on the RR, PR and JT intervals of ECG. Methods: This is a prospective study among a cohort of 30 healthy female students, who were aged 18-22 years and had regular menstrual cycles over past six months. Subjects were monitored on three separate occasions during two consecutive menstrual cycles. ECG was recorded for 5 minutes in Lead –II using Power lab multichannel polygraph instrument, once during every phase. The computerized recordings of RR, PR and JT intervals thus obtained were analyzed statistically using pooled t test, probability < 0.05 to assess if any significant difference existed in these parameters during the different phases of menstrual cycle. Results: This study did not show any statistically significant variation in RR, PR and JT intervals between the menstrual, follicular and luteal phases of the menstrual cycle. Conclusion: It may be concluded that there was no statistically significant variation in RR, PR and JT intervals during different phases of the menstrual cycle which may be due to the small sample size.