Spectral heart rate variability analysis in experimental obstructive and chemical overactive bladder models

Area of Science:

• Physiology
• Urology
• Autonomic Nervous System Research

Background:

• Overactive bladder (OAB) pathophysiology involves autonomic nervous system (ANS) disturbances.
• Understanding these ANS disturbances is crucial for OAB management.

Purpose of the Study:

• To estimate ANS activity in experimental OAB models using spectral analysis of heart rate variability (HRV).
• To compare ANS activity in chemical (cyclophosphamide-induced) and obstructive OAB models.

Main Methods:

• Studied 10 cyclophosphamide-induced OAB (COAB) rats and 10 obstructive OAB (OOAB) rats with controls (40 animals total).
• Performed resting HRV recordings and analyzed standard spectral HRV parameters.
• Confirmed bladder overactivity via urodynamic and histological assessments.

Main Results:

• Both COAB and OOAB models showed diminished non-normalized spectral HRV parameters.
• OOAB rats exhibited significant decreases in Low Frequency (LF) and High Frequency (HF) components.
• OOAB group displayed a nearly doubled Very Low Frequency (VLF) percentage compared to controls, indicating pronounced autonomic disturbances.

Conclusions:

• Spectral HRV analysis indicates ANS disturbances in both COAB and OOAB models.
• The exaggerated VLF component differences in OOAB suggest increased autonomic dysregulation in this model.
• Findings highlight HRV spectral analysis as a tool for assessing ANS involvement in OAB.