A systematic review, meta-analysis, and trial sequential analysis of the effect of acupuncture and moxibustion cake on thyroid function in patients with Hashimoto thyroiditis

BACKGROUND: Hashimoto thyroiditis (HT) is a prevalent autoimmune thyroid disorder that currently lacks a specific treatment. While oral levothyroxine sodium tablets have been found to significantly enhance thyroid function, they do not contribute to a decrease in concentrations of thyroid-related antibodies. We aimed to design a systematic review, meta-analysis, and trial sequential analysis of the effect of acupuncture and moxibustion cake on thyroid function in patients with HT. METHODS: We conducted an unrestricted search up until March 29, 2024, across 7 databases. These included 4 international databases, namely, PubMed, Web of Science, Scopus, and Cochrane Library, as well as 3 Chinese databases such as CNKI, VIP, and Wanfang. We used Review Manager, version 5.3, for meta-analysis and presented the data as mean difference (MD) and 95% confidence interval to evaluate the role of acupuncture or moxibustion on biomarker levels in HT. RESULTS: A total of 306 records were identified through databases, and 15 articles were included in the meta-analysis. In the acupuncture group: thyroid peroxidase antibody (TPOAb): the pooled MD is -61.97 (P < .00001), thyroglobulin antibody (TGAb): the pooled MD is -44.78 (P = .001), thyroid-stimulating hormone (TSH): the pooled MD is -2.64 (P < .00001), free triiodothyronine: the pooled MD is 0.47 (P = .09), and free thyroxine: the pooled MD is 1.46 (P = .02). In the moxibustion group: TPOAb: the pooled MD is -11.44 (P = .0002), TGAb: the pooled MD is -8.63 (P = .004), TSH: the pooled MD is -1.00 (P = .27), free triiodothyronine: the pooled MD is 1.12 (P = .14), and free thyroxine: the pooled MD is 1.04 (P = .07). CONCLUSION: The meta-analysis indicates that acupuncture and moxibustion may influence thyroid-related biomarkers (TPOAb, TGAb, and TSH) in patients with HT; however, the evidence is highly limited by methodological weaknesses, heterogeneity, and publication bias. These factors preclude reliable clinical recommendations at this stage. Further well-designed, large-scale randomized controlled trials are essential to determine whether these interventions have true clinical efficacy.