Fig. 4.

Inhibition of spinal reflex bladder contractions by pudendal nerve stimulation (PNS) is reduced by propranolol, but not by naloxone. A: CMG tracings before and after propranolol administration. The downward arrow on the CMG tracing indicates where the bladder capacity is measured. B: propranolol (3 mg/kg) significantly reduced PNS inhibition (n = 5 cats). C: administration of naloxone (tracings not shown) had no effect on bladder capacity or PNS inhibition (n = 5 cats). *Significant (P < 0.05) difference from control (one-way ANOVA). #Significant (P < 0.05) difference before and after the drug treatment (two-way ANOVA).