Myofascial Pain in Hysterectomy Patients

STUDY OBJECTIVE: To assess the prevalence of myofascial pain in women undergoing uncomplicated, minimally invasive hysterectomy for chronic pelvic pain, to identify clinical and demographic factors associated with preoperative myofascial pain, and examine the association between myofascial pain and postoperative pain in hysterectomy patients. DESIGN: A retrospective cohort study. SETTING: A tertiary care teaching hospital. PATIENTS: A total of 353 adult women who underwent uncomplicated, minimally invasive hysterectomy between January 2014 and 2016. INTERVENTIONS: All women underwent a preoperative pelvic floor examination. Myofascial pain was diagnosed as tenderness and reproduction of pain symptoms in at least 2 of 6 pelvic floor muscles. Demographics, comorbidities, and intraoperative characteristics were compared between women with and without preoperative myofascial pain. MEASUREMENTS AND MAIN RESULTS: Of the 353 women who underwent hysterectomy, the prevalence of myofascial pain was 42.7% (86.0% in patients with chronic pelvic pain [CPP] compared with 13.7% without CPP). Women with myofascial pain were more likely younger, Caucasian, sexually active, and with comorbid pain conditions. Patients with myofascial pain used a greater number of adjuvant pain medications before surgery including opiates (29.5%) but were only half as likely to use muscle relaxants (12.1%) for preoperative pain control. Contrastingly, in women without myofascial pain before surgery, controlled substances such as opiates (8%, p <.01) and benzodiazepines (3%, p <.01) were used at a three- fold lower frequency. Postoperative pain score was higher in patients with myofascial pain, with 37% reporting a visual analog scale score greater than 5 at the routine postoperative visit compared with only 1% of patients without myofascial pain. CONCLUSION: Myofascial pelvic pain must be considered in the evaluation of CPP, especially in surgical candidates. Women with myofascial pelvic use a greater amount of pain medication preoperatively and have higher pain scores postoperatively. Identification of these high-risk patients before surgery may improve pre and postoperative pain management with a multimodal therapy approach.