Sudden sensorineural hearing loss (SSHL) is defined as a hearing reduction of ≥30 dB at at least three consecutive frequencies, occurring within up to 72 hours. With an estimated incidence of 5–27 cases per 100,000 inhabitants/year, SSHL is considered an otologic emergency: every hour without treatment potentially affects definitive hearing recovery. Conventional treatment includes systemic or intratympanic corticosteroid, vasodilators, and hemorheologic agents — but 30–40% of patients remain with significant permanent hearing deficit even with timely treatment. A meta-analysis published in Integrative Medicine Research in September 2024, pooling 28 RCTs with 2,456 patients, provides robust evidence that acupuncture as an adjunct to conventional treatment substantially improves hearing prognosis.
The study was conducted by Wenqi Ren, Bo Tao, and Haixia Deng, and searched for evidence in seven databases: PubMed, EMbase, Cochrane Library, CNKI, Wanfang, VIP, and SinoMed, with a cutoff date of September 2024. The broad scope of the searches — including extensive Chinese databases — is relevant because China concentrates much of the clinical research on acupuncture for SSHL, and exclusion of these sources systematically biases reviews published only in Western databases. The 28 included RCTs represent 1,189 patients in the acupuncture group and 1,267 in the control group, with separate analyses for acupuncture in combination with conventional Western medicine (WMCT) versus WMCT alone, and for acupuncture as monotherapy versus WMCT.
RESULTS OF THE ACUPUNCTURE META-ANALYSIS FOR SSHL (IMR, SEPTEMBER 2024)
Two Distinct Scenarios: Adjunct or Monotherapy
The analysis was stratified into two important clinical scenarios. In the first — and most relevant for Western practice — acupuncture was added to conventional treatment with corticosteroid and vasodilators. In this comparison, the effect was maximum and consistent: RR 1.18 for total response (with no relevant heterogeneity), MD −10.71 dB for hearing threshold, and RD 0.15 for complete audiometric response rate. In practical terms, 15 of every 100 patients who would have partially responded to conventional treatment achieve complete audiometric response (recovery of ≥10 dB on PTA) by receiving adjuvant acupuncture — a clinically substantial number in a condition with a guarded prognosis.
In the second scenario — acupuncture versus conventional treatment without acupuncture — the results were equally positive for total response rate (RR 1.19, P=0.001) and complete audiometric response rate (RD 0.11, P=0.01), but the pure-tone hearing threshold did not show a significant difference between groups (MD −5.45 dB, P=0.48). This dissociation — improvement in clinical effectiveness but no statistical audiometric difference as monotherapy — suggests that acupuncture potentiates hearing recovery mechanisms that go beyond simple improvement in tone threshold, possibly involving recovery of speech discrimination and associated vestibular function.
Results: Therapeutic Window and Acupoint Protocol
A critical clinical datum that emerges from the included RCTs is the importance of the therapeutic window: studies initiated in the first 48–72 hours after the onset of hearing loss showed superior recovery to those initiated later. This pattern is biologically coherent — the acute inflammatory and ischemic process is more reversible before cochlear damage consolidates. The practical recommendation is to integrate acupuncture as early as possible into the corticosteroid protocol, not to await the response to conventional treatment to decide on referral to the medical acupuncturist.
The acupoints most used in the included RCTs were SJ-17 (Yifeng), SJ-21 (Ermen), GB-2 (Tinghui), SI-19 (Tinggong) — all periauricular and with direct access to the vascular and nervous structures of the inner ear — combined with distal acupoints such as GB-34 (Yanglingquan), ST-36 (Zusanli), and KI-3 (Taixi). This local-distal combination is the standard strategy of Chinese acupuncture medicine for otologic conditions.
Frequently Asked Questions
Yes, and that is exactly the combination evaluated by most of the RCTs included in this meta-analysis — adjuvant acupuncture to corticosteroid treatment. There is no known pharmacologic interaction. Practical coordination involves the timing of sessions: ideally acupuncture is applied on the same days or alternating days of the corticosteroid cycle, so that the vasodilator and anti-inflammatory effects of acupuncture complement those of medication treatment.
The RCTs included in the meta-analysis varied from 10 to 30 sessions, with most protocols lasting 2–4 weeks. The hearing recovery window in SSHL is biologically limited — spontaneous recovery, when it occurs, is largely complete in the first 4–6 weeks. For this reason, treatment intensity should be greater in this initial phase. Audiometric improvement may be documented as early as the first 1–2 weeks; formal audiologic evaluation should be repeated at the end of the treatment cycle for a decision on continuity.
This meta-analysis specifically evaluated sudden sensorineural hearing loss, not tinnitus as a primary outcome. However, there is a separate body of evidence on acupuncture for primary tinnitus and for tinnitus associated with SSHL, with promising results especially in cases of recent-onset tinnitus. In patients with SSHL + tinnitus, the medical acupuncturist may address both conditions in the same protocol, adapting the acupoints to include those with specific evidence for tinnitus (such as SJ-5, GB-20, and LI-4).
Fonte Original
Integrative Medicine Research(em inglês)Founded in 1989 by physicians trained at the University of São Paulo (USP) and specialized in China, CEIMEC is a Brazilian national reference in the teaching and practice of medical acupuncture. With more than 3,000 physicians trained over 35 years, it collaborates with HC-FMUSP and is recognized by the Brazilian Medical College of Acupuncture (CMBA/AMB).