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Placebo effect in surgery for Meniere's disease: three-year follow-up
Abstract:
In 1981 we published the results of a double-blind, placebo-controlled study in which the efficacy of a regular endolymphatic sac mastoid shunt was compared with a purely placebo operation (mastoidectomy) in controlling the symptoms of 30 patients with typical Meniere's disease. Minor differences could be demonstrated between the shunt and the sham operation, but the greatest difference was between the preoperative and postoperative scores, and both groups improved significantly. It was concluded that the impact of the various endolymphatic sac shunts on the symptoms of patients with Meniere's disease is nonspecific, and that the 70% improvement in both groups was most likely caused by a placebo effect. At the time of the presentation, the results were based on a 1-year follow-up of all patients. As of January 1982 the patients had been followed for a minimum of 3 years. The 3-year results are the same as our results from the first year: no significant difference could be found between the two groups.
Insights
A 1981 study on Meniere's disease found that endolymphatic sac mastoid shunts offered no significant benefit over placebo surgery. Long-term results confirm that symptom improvement in both groups was likely due to the placebo effect.
Area of Science:
- Otolaryngology
- Neurosurgery
- Clinical Trials
Background:
- Meniere's disease is a disorder of the inner ear affecting balance and hearing.
- Endolymphatic sac shunts were a surgical option to manage Meniere's disease symptoms.
- Previous studies suggested potential efficacy of surgical interventions.
Purpose of the Study:
- To compare the efficacy of endolymphatic sac mastoid shunts versus a placebo (mastoidectomy) in treating Meniere's disease.
- To assess the long-term effectiveness of the shunt procedure.
- To determine if surgical intervention provides specific benefits beyond a placebo response.
Main Methods:
- A double-blind, placebo-controlled study involving 30 patients with Meniere's disease.
- Comparison of endolymphatic sac mastoid shunt surgery against a sham mastoidectomy procedure.
- Preoperative and postoperative symptom scoring for both treatment groups.
- Follow-up evaluation at 1 year and extended to a minimum of 3 years.
Main Results:
- Both the shunt group and the placebo group showed significant improvement in Meniere's disease symptoms.
- No statistically significant difference in symptom control was observed between the shunt and the placebo surgery.
- The observed improvements were consistent across the 1-year and 3-year follow-up periods.
Conclusions:
- The effectiveness of endolymphatic sac shunts for Meniere's disease symptoms appears to be nonspecific.
- The significant symptom improvement in both groups strongly suggests a substantial placebo effect.
- Surgical interventions for Meniere's disease may not offer specific therapeutic advantages over placebo.