Acupuncture for the Treatment of Alzheimer's Disease: An Overview of Systematic Reviews

The use of acupuncture in the treatment of Alzheimer's disease has attracted growing interest as a promising complementary therapy. Alzheimer's disease is a progressive neurodegenerative condition that mainly affects the older adult population, causing deterioration of memory, cognitive function, language ability, and emotional changes. There are currently around 24 million people with Alzheimer's worldwide, a number that may increase fourfold by 2050. FDA-approved medications offer only modest symptomatic effects and are associated with various adverse reactions, leading many patients to seek complementary and alternative therapies to improve their quality of life.

In this context, acupuncture has been accepted worldwide as a popular and safe complementary therapy, widely used by physicians seeking to reduce the side effects of conventional medications and enhance their therapeutic efficacy.

This study aimed to critically evaluate the scientific quality of existing systematic reviews and meta-analyses on the use of acupuncture for the treatment of Alzheimer's disease. The investigators conducted a comprehensive analysis, searching eight electronic databases from inception through October 2020. To ensure a rigorous assessment, they used multiple evaluation tools: AMSTAR-2 to assess methodologic quality, PRISMA for reporting quality, ROBIS for risk of bias, and GRADE for evidence quality. This type of study, called an overview of systematic reviews, represents a relatively new approach to synthesizing results from multiple reviews on the same topic, offering a broader and more reliable perspective of the available scientific knowledge.

The analysis identified eleven systematic reviews and meta-analyses meeting the inclusion criteria, published between 2008 and 2020. All reviews were conducted by researchers from Asian countries, ten from China and one from Korea. The number of studies included in each review ranged from three to 31, with sample sizes between 166 and 2,045 participants. The interventions analyzed included manual acupuncture, electroacupuncture, and acupuncture combined with conventional treatment.

Results revealed significant methodologic limitations: all reviews were rated as critically low quality by AMSTAR-2, mainly due to lack of protocol registration, incomplete search strategies, and inadequate risk-of-bias assessment. Using the GRADE system, no high-quality evidence was identified, and only seven outcomes provided moderate-quality evidence. The main factors that lowered the quality of evidence were risk of bias in the original studies, inconsistencies between studies, imprecision of results, and publication bias.

For patients and clinicians, the results suggest that acupuncture may be a promising complementary therapy for Alzheimer's disease. Eight of the eleven reviews concluded that acupuncture showed positive effects, either alone or in combination with conventional treatment. Observed benefits included improvements in cognitive function, measured by scales such as the Mini-Mental State Examination, improvements in activities of daily living, and reduction in disease symptoms assessed by the Alzheimer's Disease Assessment Scale. When combined with conventional medications, acupuncture was shown to be superior to drug treatment alone in several respects.

However, it is crucial that patients and family members understand that these conclusions should be interpreted with caution given the methodologic limitations identified. Acupuncture should be viewed as a complement, not a substitute, for conventional medical treatment, and should always be performed by qualified professionals.

The main limitations of this study include the unsatisfactory methodologic quality of the reviews analyzed, the lack of studies conducted outside Asia (which may limit applicability of results to Western populations), and the small number of original studies shared across reviews. Many of the original studies included in the reviews showed flaws in methodologic design, such as inadequate randomization, lack of allocation concealment, and absence of blinding — factors that compromise the reliability of results. Furthermore, most reviews did not register protocols in advance, did not provide complete search strategies, and did not present lists of excluded studies with justifications, which compromises the transparency and reproducibility of analyses.

In conclusion, although acupuncture appears to be a promising complementary therapy for Alzheimer's disease, the low methodologic quality of the reviews supporting these results is concerning. Before broad recommendations can be made, high-quality studies with rigorous designs and larger samples are needed. Future research should follow established guidelines such as CONSORT and STRICTA, register protocols in advance, and conduct more rigorous risk-of-bias assessments. It is also essential that studies be conducted in both the East and the West to better understand the applicability of acupuncture in different populations.

For patients considering acupuncture as a complementary treatment, it is important to discuss this option with their physicians and seek qualified practitioners, always maintaining conventional medical treatment as the foundation of care.