Key result
Heart rate was significantly increased during the secretory phase (98.26 bpm) compared to the menstrual phase (91.85 bpm) of the menstrual cycle, while QT and QTc intervals showed no significant differences.
Why the study?
The study was undertaken to investigate the influence of hormonal fluctuations during the menstrual cycle on ECG parameters.
Do different phases of the menstrual cycle affect heart rate, QT, and QTc intervals in healthy young women?
Cohort (n=30)
No
Do different phases of the menstrual cycle affect heart rate, QT, and QTc intervals in healthy young women?
Absolute Event Rate: 98.26% vs 91.85%
p-value: p=<0.05
Heart rate significantly increases during the secretory phase of the menstrual cycle, highlighting the influence of hormonal fluctuations on autonomic tone and cardiac electrophysiology.
Secretory-phase heart rate rise may affect ECG timing in young women; leaves open arrhythmia relevance pending larger prospective studies.
Aim: The present study was undertaken with the aim to investigate influence of hormonal fluctuation duringmenstrual cycle on ECG.Materials and Method: The present study was carried out on 30 healthy female medical students in theage group of 18 to 23 years with normal menstrual cycle of 27-33 days. ECG was recorded on 2nd,11th,22ndday of menstrual cycle (corresponding with menstrual phase, proliferative phase and secretory phase ofmenstrual cycle), using AD INSTRUMENT–POWERLAB®/30 Series.Results: The study revealed that Heart rate was significantly (P<0.05) increased in secretory phase(98.26±10.44) compared to menstrual phase (91.85±10.27).QT and QTc interval showed increase duringproliferative phase but not significant.Discussion: Fluctuation in both estrogen and progesterone during menstrual cycle influence not only phase-II of cardiac action potential but also autonomic tone which could have led to prolonged QTc in Proliferativephase and increase in heart rate during secretory phase in present study, which provides a screening toolto avoid morbidity due to intake of drugs which prolonged QTc interval during menstrual cycle. But QTcinterval in present study was not increased significantly as it was done during single cycle.
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Gidugupati Anuradha (2020) conducted a cohort in Healthy (normal menstrual cycle) (n=30). Secretory phase of menstrual cycle vs. Menstrual phase was evaluated on Heart rate (BPM) (p=<0.05). Heart rate was significantly increased during the secretory phase (98.26 bpm) compared to the menstrual phase (91.85 bpm) of the menstrual cycle, while QT and QTc intervals showed no significant differences.
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