Introduction: Growing evidence suggests that acupuncture can improve pelvic pain in women with endometriosis. The treatments used in research vary considerably. It remains unclear which treatment could be recommended for clinical practice. This research project aimed at clarifying how acupuncture could be used when treating this condition. Methods: This research comprised two phases: a systematized literature review to extract acupuncture treatment details from published research, and an e-Delphi study to gain knowledge about details as used by expert acupuncturists. Review: Four databases were searched using predefined eligibility criteria. Data were extracted based on the STandards for Reporting Interventions in Clinical Trials of Acupuncture (STRICTA) criteria. e-Delphi: Purposeful sampling from colleagues and international experts. An open first round gathered qualitative data, analyzed with the Framework method. In rounds 2 and 3, experts rated statements to build group consensus, defined as a rating of ≥5 on a 7-point Likert scale by ≥70% of the experts. The strength of agreement was graded using the median score and interquartile range. Results from the literature review and the e-Delphi were compared using the STRICTA items. Results: The literature review (n = 29 unique studies) found a wide range of treatment details with little agreement. The e-Delphi of international experts (n = 20) resulted in agreement on 94 statements (such as key factors for effectiveness); disagreement on a further 29 (such as acupressure); and absence of consensus on 55 statements (such as the number of needle insertions). A comparison of the review and e-Delphi results found little agreement. Conclusions: Details of acupuncture treatment for endometriosis-related pelvic pain were presented. In the absence of acupuncture guidelines for this condition, the researchers of this e-Delphi recommend using the treatment details on which experts agreed as guidance for good practice. The effectiveness of these guidelines should be evaluated in future research. Study registration: Deutsches Register Klinischer Studien, DRKS00022215, June 30, 2020, retrospectively registered.
Keywords: Delphi; acupuncture; consensus; endometriosis; guideline; pelvic pain.