Clinical Practice Guideline of Acupuncture for Bell's Palsy

This important clinical practice guideline represents a milestone in the treatment of Bell's palsy with acupuncture, developed by the World Health Organization for the Western Pacific region. Bell's palsy, also known as idiopathic peripheral facial paralysis, affects between 11.5 and 53.3 people per 100,000 inhabitants annually, with 30% of cases presenting inadequate recovery. The guideline was prepared by a multidisciplinary group of 17 experts in acupuncture, neurology, epidemiology, and evidence-based medicine, following rigorous protocols for developing clinical guidelines. The methodology included a systematic search for evidence in English, Chinese, Japanese, and Korean, as well as analysis of classical TCM texts and expert experience.

The evidence classification system followed international standards (AHCPR and SIGN), categorizing studies from systematic reviews of randomized clinical trials (level Ia) to case reports and expert opinions (level IV). Recommendations were graded from A (strongest) to C, plus GPP (good practice points) based on expert consensus. The guideline establishes clear diagnostic criteria, emphasizing the importance of excluding other causes of facial paralysis through laboratory tests, CSF analysis, and neuroimaging. Differentiation according to TCM includes five patterns: invasion of wind-cold, attack of wind-heat, obstruction of the collaterals by phlegm and blood stasis, qi deficiency with blood stasis, and yin deficiency generating wind.

The proposed staging divides the disease into four phases: acute (up to 1 week), subacute (up to 3 weeks), recovery (3 weeks to 6 months), and sequelae (more than 6 months). The main recommendations include Grade A for: initiating acupuncture as early as possible; for cases up to 3 months, patients with mild paralysis may use acupuncture, Western medications, or combined therapy, whereas severe cases should receive acupuncture or combined therapy; for cases of more than 3 months, acupuncture is the most appropriate option. The point selection principle prioritizes local points, points along the corresponding meridians, and selection based on pattern differentiation, with a predominance of the yangming (陽明) meridians. Methods include filiform needling, moxibustion, electroacupuncture, and combined therapies.

The main recommended points are ST-4 (dìcāng, 地倉), ST-6 (jiáchē, 頰車), GB-14 (yángbái, 陽白), and ST-7 (xiàguān, 下關) on the affected side, and LI-4 (hégǔ, 合谷) bilateral. Treatment varies by stage: in the acute phase, use shallow needling with gentle manipulation; in the subacute phase, add electroacupuncture and adjuvant therapies; in the recovery phase, use through-needling and electroacupuncture; in the sequelae phase, use more intense through-needling techniques. For special populations, the guideline provides specific guidance: patients with diabetes require glycemic control and rigorous asepsis; children require prior massage and gentle manipulation; pregnant women should avoid specific points such as GV-26, LI-4, LR-3, and SP-6. Outcome assessment recommends the House-Brackmann scale as the primary index and the WHOQOL-BREF for quality of life.

The safety profile is excellent, with only 5 adverse events reported in 480 participants, mainly acupuncture syncope related to nervousness or heat. The guideline represents a unique synthesis of evidence-based medicine and millennia-old traditional knowledge, offering a standardized protocol that may significantly improve clinical results and reduce the heterogeneity of future studies.