Spinal anaesthesia using 1.2 ml of hyperbaric cinchocaine was found to abolish the autonomic hyper-reflexic cardiovascular responses to bladder distension and produced little alteration in cardiovascular measurements.
Barker, Alderson, Lydon, Franks, , , , , (1985). Cardiovascular effects of spinal subarachnoid anaesthesia. A study in patients with chronic spinal cord injuries. Anaesthesia, 1985 Jun;40(6):533-6. https://www.ncbi.nlm.nih.gov/pubmed/4025745