Heart rate variability in men with lower urinary tract symptoms: a case-control study

Purpose Measurement of heart rate variability (HRV) allows evaluation of autonomic nervous system activity. Decreased HRV is associated with autonomic disbalance, poor health and higher mortality. Our objective is to evaluate the HRV in men with lower urinary tract symptoms (LUTS) through a case-control study. Methods LUTS were considered as the outcome and HRV variables were considered as exposure. The protocol included anamnesis, LUTS assessment, anthropometry, blood pressure and HRV measurement by analyzing the variation in the time interval between consecutive heartbeats or RR intervals. The mathematical study of HRV indicators allowed the assessment of the cardiac autonomic modulation of the volunteers. Results Eighty nine patients were included in the study, with 34 allocated to the case group (with LUTS) and 55 to the control group (without LUTS). The patients were similar in terms of age and systolic and diastolic blood pressure. Among the HRV variables, the mean VLF index for the very low frequency of the spectrum associated with the frequency domain was significantly higher in volunteers without LUTS. Control group patients presented a mean of 113.18 +/- 166.74 ms(2), while patients with LUTS presented a mean of 69.21 +/- 61.98 ms(2) (p = 0.032). Conclusions Men 50-59 years of age without chronic diseases and with LUTS have an unfavorable cardiac autonomic profile indicated by significantly lower levels of the VLF component of HRV compared to men without LUTS.