Frequency Dependent Effects on Bladder Reflex by Saphenous Nerve Stimulation and a Possible Action Mechanism of Tibial Nerve Stimulation in Cats.

Purpose The present study determined the effects of saphenous nerve stimulation (SNS) at different stimulation frequencies on bladder reflex and explored a possible action mechanism of tibial nerve stimulation (TNS) on bladder activity in cats. Methods Two bipolar nerve cuff electrodes were implanted on the saphenous nerve and the contralateral tibial nerve in 13 cats, respectively. Multiple cystometrograms (CMGs) were obtained to determine the effects of single SNS at different frequencies and that of combined SNS and TNS on the micturition reflex by infusing normal saline. Results SNS at 1 Hz significantly reduced the bladder capacity (BC) to 59.8 ± 7.7% and 59.3 ± 5.8% of the control level at the intensity threshold (T) and 2T, respectively (P 0.05), while combined stimulation at 1T significantly increased the BC to 122.7 ± 1.9% of the control level and induced an inhibitory effect which was similar to that TNS at 2T. Conclusions The current study revealed that SNS reduced and increased BC depending on different stimulation frequencies. The combined SNS and TNS maximized the clinical efficacy at a low intensity. Also, SNS may be a potential therapeutic mechanism of TNS.