Comparison between Tramadol and Butorphanol for Treating Postoperative Catheter-Related Bladder Discomfort: A Randomized Controlled Trial

Figure 4

Therapeutic effect of butorphanol on CRBD patients. It is mainly through activating K receptor to inhibit the bladder stimulation into the spinal cord center, thereby improving stress relaxation, relaxation of smooth muscle, and management of visceral pain.