Key result
Polycystic ovary syndrome is associated with a significant decrease in heart rate variability, including a reduction in SDNN compared to healthy controls.
Why the study?
Decreased heart rate variability is linked to adverse cardiovascular events, and recent research has suggested altered autonomic drive in PCOS, warranting evaluation of cardiac autonomic function via HRV in this population.
Does polycystic ovary syndrome reduce heart rate variability in women of reproductive age compared to healthy controls?
Meta-Analysis (n=1,013)
Does polycystic ovary syndrome reduce heart rate variability in women of reproductive age compared to healthy controls?
Answers are grounded in this paper and cite their sources.
Women with polycystic ovary syndrome exhibit diminished heart rate variability compared to healthy controls, suggesting impaired cardiac autonomic function that may contribute to increased cardiovascular risk.
OBJECTIVES: Polycystic ovary syndrome (PCOS) is a prevalent and complex endocrine disorder that affects women of reproductive age. It has significant implications for female endocrine function, reproductive health, and metabolic disturbances, including insulin resistance, impaired glucose tolerance, and dyslipidemia. Studies have shown that decreased heart rate variability (HRV), a marker of autonomic dysfunction, is associated with adverse cardiovascular events. Recent research has focused on investigating autonomic function in PCOS, and some studies have suggested altered autonomic drive in these patients. The aim of this systematic review and meta-analysis was to evaluate cardiac autonomic function by analyzing HRV in women with PCOS. METHODS: This systematic review was prepared using PRISMA reporting guidelines. The databases searched were PubMed, Scopus, Web of Science, and Cochrane. Risk of Bias was assessed using ROBINS-I for non-RCTs. The GRADE approach was employed to evaluate the level of certainty in the evidence for each outcome. In order to identify the underlying cause of high heterogeneity, a subgroup analysis was conducted. Sensitivity analysis was checked. A random effect model was used and calculated a pooled standardized mean difference (SMD) with a 95% confidence interval (CI). RESULTS: Seventeen articles were included in the final analysis, varied in quality, ranging from a "low" to a "high risk of bias". Combined analyses indicated a notable decrease in HRV among individuals with PCOS compared to the control group. Significant changes were observed in SDNN (SMD: -0.763, 95%CI [-1.289 to -0.237], p=0.004), PNN50 (SMD: -1.245, 95%CI [-2.07, -0.419], p=0.003), LF/HF ratio (SMD: 0.670, 95%CI [0.248, 1.091], p=0.002), HFnu (SMD: -0.873, 95%CI [-1.257, -0.489], p=0.000), LFnu (SMD: 0.840, 95%CI [0.428, 1.251], p=0.000) and TP (SMD: -1.997, 95%CI [-3.306, -0.687], p=0.003). The heterogeneity was partially explained by types of study design. Subgroup analysis revealed significant alterations of HRV in normal-weighted and overweight PCOS cases. Conversely, no significant changes in HRV were observed in obese PCOS cases. CONCLUSION: The findings of this meta-analysis provide evidence suggesting diminished HRV in individuals with PCOS compared to non-PCOS control group.
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Mirzohreh et al. (2024) conducted a meta-analysis in Polycystic ovary syndrome (PCOS) (n=1,013). Polycystic ovary syndrome vs. Non-PCOS control group was evaluated on Standard deviation of normal-to-normal intervals (SDNN) (SMD -0.763, 95% CI -1.289 to -0.237, p=0.004). Polycystic ovary syndrome is associated with a significant decrease in heart rate variability, including a reduction in SDNN compared to healthy controls.
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