Effects of electroacupuncture on chronic urinary retention after pelvic or lumbosacral tumor resection surgeries: a retrospective cohort study.

Background: Chronic urinary retention (CUR) resulting from lower motor neuron lesions (LMNL) is a medical condition secondary to pelvic or lumbosacral tumor resection surgeries. Electroacupuncture (EA) is proved to be effective and safe in treating certain lower urinary tract disorders. However, the clinical benefit and optimal duration of EA treatment for CUR following LMNL remain unknown. Methods: Using a retrospective cohort design, 20 eligible patients diagnosed with CUR resulting from LMNL secondary to pelvic or lumbosacral tumor resection surgeries were included from March 1, 2017, to June 30, 2020. The patients were treated by EA three times a week for 2 to 12 weeks and followed up for 24 weeks after treatment. The electric stimulators with a 5-Hz continuous wave (5-10 mA intensity) were separately connected to bilateral Ciliao (BL32), bilateral Zhongliao (BL33), and bilateral Huiyang (BL35), and stimulators with a 10-Hz continuous wave (1-2 mA intensity) were connected to bilateral Sanyinjiao (SP6). Current intensity was adjusted according to the patients' individual tolerance. The median follow-up was 32 weeks (range, 26-36 weeks). Responders were defined as patients whose post-void residuals (PVR) reduced by 50% or more from baseline. Adverse event was recorded. Results: Totally 20 patients [mean (standard deviation) age, 48.1 (15.5) years; 9 men (45.0%); 11 women (55.0%)] were included. Of the 20 patients, 14 (70.0%) had responded to EA treatment and stopped catheterization for achieving satisfactory spontaneous urination (PVR <100 mL without complications), 7 (35.0%) had complete resolution (90-100% reduction in PVR from baseline), and 13 (65.0%) scored 1 (much better) or 2 (moderately better) in the Patient Global Impression of Improvement (PGI-I) assessment. Moreover, 6 (30.0%) patients had responded within 4 weeks of EA treatment. According to Kaplan-Meier survival curve, we found that more than 50% patients could respond to EA treatment within 8 weeks or longer. None of the responders had ever experienced relapse in 24 weeks after EA treatment ended. None of the patients manifested urinary tract infection (UTI), newly diagnosed hydroureter or hydronephrosis. One patient diagnosed with hydronephrosis at baseline recovered after 12-week EA treatment. Two patients with UTI at baseline were prescribed antibiotics and did not present UTI again during the follow-up. Conclusions: EA could be a promising treatment option for CUR caused by LMNL following pelvic or lumbosacral tumor resection surgeries, with long-term effects and a good safety profile. The optimal duration of EA should be of 8 weeks at least. But this was a retrospective cohort study of a small sample size, so future studies are needed to investigate EA in larger populations in randomized controlled trials.