Cochrane systematic reviews in acupuncture: methodological diversity in database searching

Area of Science:

• Integrative Medicine
• Evidence-Based Practice
• Systematic Review Methodology

Background:

• Acupuncture efficacy has been studied extensively since the 1970s through randomized trials.
• Systematic reviews synthesize trial results, offering high-level evidence for clinical interventions.
• Cochrane reviews are a key source for evaluating therapeutic evidence.

Purpose of the Study:

• To assess the literature sources used in Cochrane systematic reviews on acupuncture.
• To evaluate the databases searched for original studies within these reviews.
• To analyze the distribution of acupuncture trials, review conclusiveness, and MEDLINE indexing.

Main Methods:

• Systematic reviews on acupuncture were identified in the Cochrane Database of Systematic Reviews.
• The primary search term was "acupuncture"; the most recent review was selected if multiple existed on the same topic.
• MEDLINE indexing of included clinical trials was verified using PubMed's Single Citation Matcher.

Main Results:

• Out of 94 retrieved papers, 10 Cochrane reviews on acupuncture were analyzed.
• Chronic pain was the most frequent subject area for acupuncture trials.
• Significant heterogeneity was found in the number of databases searched (median 5, range 3-12).
• Only 13% of studies were published in primary acupuncture journals, while 69% were indexed in PubMed.
• Conclusive efficacy statements were made in only 2 of the 10 reviews.

Conclusions:

• Methodological diversity in database searches for acupuncture systematic reviews is substantial.
• This variability can introduce bias and complicate the interpretation of acupuncture research findings.
• Improving search comprehensiveness is crucial for reliable systematic reviews in acupuncture.