Effectiveness of Acupuncture in the Treatment of Parkinson's Disease: An Overview of Systematic Reviews

Parkinson's disease represents a growing challenge for patients and their families worldwide. As the second most common neurodegenerative disease, it affects 1 to 2% of the population over age 65, with projections that this prevalence will nearly double by 2030. The disease is not limited to known motor symptoms, such as tremor, rigidity, and bradykinesia, but also includes non-motor manifestations such as sleep disturbances, digestive problems, and emotional changes that significantly affect quality of life. Although conventional medications, especially levodopa, are widely used, they frequently cause important adverse effects, including involuntary movements, motor fluctuations, and gastrointestinal symptoms.

In this context, many patients seek complementary therapies, with acupuncture among the most sought-after due to its potential benefits and low risk of adverse effects.

This scientific study aimed to comprehensively evaluate the effectiveness and safety of acupuncture in the treatment of Parkinson's disease. The researchers performed an overview review, a special type of research that examines multiple already-published systematic reviews on the same topic, offering a broader view of the available evidence. The methodology involved a rigorous search of eight major scientific databases, including PubMed, Embase, and others, from inception through February 2020. The inclusion criteria were specific: only systematic reviews and meta-analyses that studied patients diagnosed with Parkinson's disease according to recognized international guidelines, using different types of acupuncture as treatment.

To evaluate the methodological quality of the studies, they used standardized tools such as AMSTAR-2 and GRADE criteria, which are widely accepted scientific instruments for determining the reliability of the evidence.

The results revealed important findings, but also significant limitations. Of the total of 146 articles initially identified, only 11 systematic reviews met the rigorous inclusion criteria, covering studies published between 2010 and 2019. These reviews analyzed between 8 and 42 individual studies each, with sample sizes ranging from 474 to 2,625 patients. The descriptive analysis demonstrated that acupuncture showed promising results when compared with medication treatment alone or when used as complementary therapy.

Specifically, patients treated with acupuncture showed better scores on the main Parkinson's disease assessment scales, including the UPDRS (Unified Parkinson's Disease Rating Scale), Webster Scale, and other standardized measures. As for specific symptoms, acupuncture proved particularly effective for bradykinesia, muscular rigidity, and postural problems, although it did not demonstrate significant superiority for resting tremor. Additionally, the studies suggested that acupuncture may help reduce some side effects of conventional medications, such as gastrointestinal problems and mood fluctuations.

For patients and health professionals, these results suggest that acupuncture may represent a valuable therapeutic option in the management of Parkinson's disease. The technique seems to be particularly useful when used as complementary therapy to conventional drug treatment, potentially offering additional benefits without significantly increasing the risks of adverse effects. The mechanisms by which acupuncture may exert its effects include protection of dopamine-producing neurons, reduction of brain inflammation, improvement of oxidative stress, and stimulation of the production of neurotrophic factors that promote neuronal survival and regeneration. For patients, this means that acupuncture may help not only with motor symptoms but also with non-motor aspects of the disease, such as sleep disturbances and emotional changes.

Health professionals may consider incorporating acupuncture as part of a multidisciplinary approach, especially for patients who experience significant medication side effects or who seek complementary therapies.

However, it is crucial to interpret these results with caution due to the important limitations identified. The evaluation of methodological quality revealed that all included reviews presented very low quality according to AMSTAR-2 criteria, mainly because they were not previously registered, did not include searches in gray literature, and many did not adequately evaluate publication bias. Similarly, the GRADE evaluation showed that no result presented high-quality evidence, with the majority classified as very low or low-quality evidence. These limitations stem mainly from the low quality of the original studies, which frequently presented methodological problems such as inadequate randomization, lack of appropriate blinding, and small samples.

Additionally, most studies were conducted in China, which may limit the generalizability of the results to other populations. Therefore, although the results are encouraging, studies of higher methodological quality are needed, with larger samples and more rigorous experimental designs, to definitively confirm the effectiveness of acupuncture in the treatment of Parkinson's disease. Interested patients should discuss this therapeutic option with their physicians, considering both the potential benefits and the current limitations of the available scientific evidence.