Recurrence of hemifacial spasm after microvascular decompression

Area of Science:

• Neurosurgery
• Neurology

Background:

• Hemifacial spasm (HFS) is characterized by involuntary unilateral facial muscle contractions.
• Treatment outcomes for HFS, including medical and surgical options, have historically shown variable success rates.
• Microvascular decompression (MVD) is recognized for its high initial success but is associated with significant symptom recurrence.

Purpose of the Study:

• To evaluate the long-term efficacy and recurrence rates of microvascular decompression for hemifacial spasm.
• To analyze the incidence and timing of symptom recurrence after MVD in a clinical series and a literature review.

Main Methods:

• Retrospective analysis of 34 patients who underwent MVD for HFS between 1976 and 1989.
• Comprehensive literature review of over 600 patients treated with MVD for HFS to assess recurrence patterns.

Main Results:

• 94% of patients in the series achieved continuous spasm relief post-MVD, with a mean follow-up exceeding 6 years.
• 10.3% of initially successfully treated patients experienced recurrent spasms, with no recurrences noted after 24 months symptom-free.
• Literature review indicated 86% of all HFS recurrences occurred within two years of surgery.

Conclusions:

• Microvascular decompression provides durable, long-term relief for the majority of hemifacial spasm patients.
• Patients remaining spasm-free for two years post-MVD have a very low probability (1%) of future recurrence.
• Understanding recurrence patterns aids in managing patient expectations and identifying potential causes of treatment failure.