Bladder pain caused by after contractions successfully treated with sacral neuromodulation

Sand T1, Løfsgaard L1, Løvvik A1, Løkken Lund R1, Kornbak O1

Research Type

Clinical

Abstract Category

Pelvic Pain Syndromes / Sexual Dysfunction

Abstract 446
Pain Mediators and Interventions
Scientific Podium Short Oral Session 21
Thursday 5th September 2019
14:45 - 14:52
Hall G1
Pain, other Neuromodulation Sensory Dysfunction
1.Akershus University Hospital
Presenter
T

Tor-Erik Sand

Links

Abstract

Hypothesis / aims of study
Sacral neuromodulation (SNM) has been successfully tried in the treatment of bladder pain conditions (1). However, we have not been able to find any reports of the effect of SNM in patients with painful postmicturion or after contractions, after contraction defined as the ”pressure increase  after flow ceases at the end of micturition” (2). We here present a case series of such patients.
Study design, materials and methods
7 patients, all female, age 20-27 years with a long history of daily bladder pain immediately after completed micturition were referred to our pelvic care center. The patients were all in good health and none had neurological disorders. They had all tried mirabegron 50 mg  and 6 had also used anticholinergics with no effect of the drug treatment on symptoms in 5 and moderate effect in 2 of the patients. In 4 of the patients the pain was so severe that they had quit work or delayed studies, the remaining 3 reported very bothersome symptoms with life quality impairment. Standard urodynamics with pressure flow demonstrated filling phase overactivity in 3 patients. All 7 had painful after contractions, the pain at the after contraction during the pressure-flow study mimicking the pain they regularly experienced after micturition. There were no other signs of bladder dysfunction. The 7 patients had a tined lead implanted in a first session. They then had a test period of approximately 3 weeks with a temporary pacemaker before implantation of the InterStim. The patients have had our standard follow-up regime for SNM patients to evaluate response and functioning of the InterStim at 6 weeks, 3,6 and 9 months and then yearly.  We have performed a new urodynamic examination in 4 of the patients with the InterStim in place and turned on.
Results
All 7 patients reported complete remission of pain at the end of the test period. They have been followed for 4-30 months (mean 16 months). 5 of the patients are still completely without bladder pain, 1 experiences episodes with moderate postmicturition pain at 2 week intervals and the last has low grade pain after som micturitions and most probably needs replacement of the tined lead. In the 4 patients who had a new urodynamic examination with ongoing stimulation there was no change in the urodynamic parameters, they still had their after contractions, albeit without pain.
Interpretation of results
This is a small cohort of patients with an unusual type of bladder pain. The results were consistent, all the patients implanted responded to the treatment and had a strong symptom relief that has persisted in most of the patients. SNM appears to change the perception of the pain elicited by the after contraction as the contraction is still present during treatment. The observation period is relatively short, but the observed efficacy is similar to results when SNM is used for other indications. At present we have only had female patients, no males. We have no explanation for this gender difference.
Concluding message
This is a case series that for the first time indicates a role for SNM in the treatment of painful after contractions.
References
  1. Mahran A, Baaklini G, Hassani D, Abolella HA, Safwat AS, Neudecker M, Hijaz AK, Mahajan ST, Siegel SW, El-Nashar SA Sacral neuromodulation treating chronic pelvic pain: a meta-analysis and systematic review of the literature Int Urogynecol J 2019 Mar 14. Doi:10.1007/s00192-019-03898-w (Epub ahead of print)
  2. Paul Abrams Urodynamic Techniques p. 75 In: Urodynamics. Paul Abrams, Springer London 2006.
Disclosures
Funding None Clinical Trial No Subjects Human Ethics not Req'd Retrospective Helsinki Yes Informed Consent No