A Scoping Review of the Effect of EEG Neurofeedback on Pain Complaints in Adults with Chronic Pain.

Background and Aim: Non-pharmacological treatments such as electroencephalogram (EEG) neurofeedback have become more important in multidisciplinary approaches to treat chronic pain. The aim of this scoping review is to identify the literature on the effects of EEG neurofeedback in reducing pain complaints in adult chronic-pain patients and to elaborate on the neurophysiological rationale for using specific frequency bands as targets for EEG neurofeedback. Methods: A pre-registered scoping review was set up and reported following the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) extension for Scoping Reviews (PRISMA-ScR). The data were collected by searching for studies published between 1985 and January 2023 in PubMed, EMBASE, and PsycINFO. Results: Thirty-two studies on various types of chronic pain were included. The intervention was well-tolerated. Approximately half of the studies used a protocol that reinforced alpha or sensorimotor rhythms and suppressed theta or beta activity. However, the underlying neurophysiological rationale behind these specific frequency bands remains unclear. Conclusions: There are indications that neurofeedback in patients with chronic pain probably has short-term analgesic effects; however, the long-term effects are less clear. In order to draw more stable conclusions on the effectiveness of neurofeedback in chronic pain, additional research on the neurophysiological mechanisms of targeted frequency bands is definitely worthwhile. Several recommendations for setting up and evaluating the effect of neurofeedback protocols are suggested.

The effectiveness and safety of laparoscopic uterosacral ligament suspension: A systematic review and meta-analysis.

BACKGROUND: Laparoscopic uterosacral ligament suspension (LUSLS) is a technique to correct apical pelvic organ prolapse (POP) by shortening the uterosacral ligaments with sutures. OBJECTIVE: A systematic review with meta-analysis of the effectiveness and safety of LUSLS as treatment for apical POP. SEARCH STRATEGY: PubMed and Cochrane search using 'pelvic organ prolapse', 'laparoscopy' and 'uterosacral', including synonyms. SELECTION CRITERIA: All articles in English presenting outcome of an original series of women with LUSLS as treatment of apical POP. Case reports were excluded. DATA COLLECTION AND ANALYSIS: Study enrollment was performed by two reviewers. Our primary outcome measures were objective and subjective effectiveness of the procedure. Secondary outcome measures regarded complications and recurrence. Bias was assessed with the Newcastle Ottawa Scale. MAIN RESULTS: Of 138 hits, 13 studies were included with 933 LUSLS patients. The average follow-up was 22 months. All were nonrandomised cohort studies. The pooled anatomic success rate is 90% for all LUSLS procedures (95% confidence interval [CI] 83.3-95.5). LUSLS with hysterectomy resulted in an anatomic success rate of 96.6% (95% CI 87.5-100) and LUSLS with uterus preservation 83.4% (95% CI 67.7-94.6). The pooled subjective cure rate was 90.5% (95% CI 81.9-96.5). The rate of major complications was 1%. CONCLUSIONS: Laparoscopic uterosacral ligament suspension (with or without uterus preservation) seems to be an effective and safe treatment for women with apical POP, but long-term prospective trials and randomised controlled trials are necessary to confirm these findings.

Does baseline EEG activity differ in the transition to or from a chronic pain state? A longitudinal study.

BACKGROUND AND AIM: Identifying EEG brain markers might yield better mechanistic insights into how chronic pain develops and could be treated. An existing longitudinal EEG study gave us the opportunity to determine whether the development of pain is accompanied by less alpha power-ie, a "relaxed" brain state-and vice versa. METHODS: Five-minute resting EEG with the eyes open was measured 2 times in 95 subjects at T0 (baseline) and T1 (6 months later). Based on the Short-Form Health Survey and Brief Pain Inventory questionnaire, subjects were divided into 4 groups: staying pain-free (n = 44), developing chronic pain (n = 8), becoming pain-free (n = 15), and ongoing chronic pain (n = 28). The EEG data of 14 electrodes were analyzed by multilevel regression. RESULTS: The group that developed chronic pain demonstrated less power in the lower-frequency bands over time during the resting state EEG, whereas the transition to a pain-free state had the opposite pattern. Thus, the a priori hypothesis was confirmed. CONCLUSIONS: Transitions in pain states are linked to a change in baseline EEG activity. Future research is needed to replicate these results in a larger study sample and in targeted clinical populations. Furthermore, these results might be beneficial in optimizing neurofeedback algorithms for the treatment of chronic pain.