THE INFLUENCE OF MONTELUKAST ON THE ACTIVITY OF THE AUTONOMIC NERVOUS SYSTEM ESTIMATED BY HEART RATE VARIABILITY IN EXPERIMENTAL PARTIAL BLADDER OUTLET OBSTRUCTION IN RATS.

: Due to their paracrine action, leukotrienes released from the urothelium are involved in control of the bladder function. Anti-leukotriene agents appear to exert an ameliorating effect in bladder overactivity. It is unknown, whether their possible, modulatory impact on the autonomic nervous system (ANS) activity may also contribute to the potentially beneficial effect of those compounds. Therefore, our aim was to indirectly estimate the ANS function using the heart rate variability (HRV) study in rats with experimental partial bladder outlet obstruction (PBOO), reflecting human benign prostatic hyperplasia (BPH), treated with leukotriene receptor antagonist - montelukast (MLKT). Twenty rats with surgically induced PBOO lasting for 14 days, divided into two groups: group 1 (10 control subjects) and group 2 (10 MLKT-treated rats; 2 mg/rat/day) were subjected to HRV recordings, preceded by daily urine collection and a subsequent cystectomy with histopathological evaluation of collected bladders. Standard HRV time and spectral parameters were calculated. MLKT-treated animals demonstrated an increase in power of non-normalized LF (low frequency) and HF (high frequency) components with no change of the total HRV power. Moreover, an increase and decrease in normalized nLF and nHF, respectively, were assessed in those animals compared to the control. Additionally, a decrease in daily diuresis measurement was demonstrated in MLKT-treated animals. Montelukast treatment resulted in the functional ANS status re-arrangement, with sympathetic overdrive and parasympathetic withdrawal. Those changes may contribute to alleviation of bladder overactivity symptoms, independently on leukotriene receptors blockade.