Efficacy of intradermal acupuncture for insomnia: a meta-analysis

To provide updated evidence from randomized controlled trials (RCTs) on the efficacy of intradermal acupuncture for insomnia.

A search of relevant literatures was performed on major medical databases, including the Cochrane Library, PubMed, EMBASE, CBM, CNKI, VIP, Wanfang Data and so on. Risk of bias evaluation, meta-analysis, sensitivity analysis and evidence rating of all extracted information were also conducted.

A total of 508 studies were initially identified. However, only 45 studies were deemed eligible for the present review. Meta-analyses were conducted in three comparisons separately: intradermal versus acupuncture, Effective rate (RR = 0.08, 95% CI -0.02 to 0.19), Global scales score (points) (SMD = -0.52, 95% CI: -0.81,-0.24, P = 0.02); intradermal acupuncture versus non acupuncture, Effective rate(RR = 1.22, 95% CI 1.04 to 1.42), Global scales score (points) (SMD = -0.81, 95% CI: -1.23,-0.38, P < 0.00001); control group versus control add intradermal acupuncture. Effective rate(RR = 1.27, 95% CI 1.13 to 1.42), Global scales score (points) (SMD = -1.15, 95% CI: -1.46,-0.84, P < 0.00001). Although these results suggested benefits of intradermal acupuncture, the overall quality of evidence rated was low.

The summary estimates indicate that it improved the clinical effective rate and lowered PSQI or other scales score, when compared to sham acupuncture or placebo/conventional medications/herbs.Also,it significantly improved the clinical effective rate and lowered PSQI or other scales score, when the control groups add intradermal acupuncture. However, the quality of the evidence is varied from very low to low due to the potential risk of bias and inconsistency among included trials. The more larger sample size and much more rigorous designed RCTs are still further studied.