Effectiveness of Auricular Acupuncture for Insomnia: An Overview of Systematic Reviews

The effectiveness of auricular acupuncture (AA) for insomnia is far from uniform. The aim of this overview was to summarize and critically evaluate the evidence from systematic reviews (SRs)/meta-analysis (MAs) and provide an overall verdict about the therapeutic value of AA for insomnia.

A search of relevant literature for SRs/MAs was performed on major medical databases. The methodological quality was assessed using the Assessing the Methodological Quality of Systematic Reviews 2 (AMSTAR-2) and the evidence quality was assessed using the Grading of Recommendations, Assessment, Development and Evaluation (GRADE).

Seven SRs/MAs were deemed eligible for the present overview. According to the evaluation results of AMSTAR-2, the methodological quality of all included SRs/MAs was critically low. Consistent methodological deficiencies were item 2 (the lack of a protocol), item 4 (the lack of a specific search strategy), item 7 (the lack of a list of excluded studies), and item 15 (the lack of an assessment of publication bias). For GRADE, of the 17 outcomes, only 1 (5.9%) was rated of high-quality, 4 (23.5%) were rated of moderate-quality, and the remaining 12 (70.6%) were rated of low-or critically low-quality. Descriptive analysis of the outcomes reveals a positive effect of AA for insomnia.

AA may be beneficial for insomnia, but the evidence is plagued by important limitations, e.g., the poor quality of SRs/MAs and primary studies.