반측안면경련증에 대한 미세혈관감압술 후 증상 소실의 시간적 경과

초록

PURPOSE : After microvascular decompression (MVD) for hemifacial spasm (HFS), resolution of symptom is often gradual. This study is to investigate time course of symptom disappearance after operation. MATERIALS AND METHODS : In 115 patients with HFS who had MVD from April 2003 to December 2006, 89 patients, who had no facial paralysis after operation and showed no spasm at 1.5 years after operation, were selected. Symptom disappearance course with time after MVD was classified into Type 1 (symptom disappearance right after operation), Type 2 (delayed symptom isappearance) and Type 3 (unusual symptom disappearance). Type 2 was classified into Type 2A (with postoperative silent period) and Type 2B (without silent period). RESULTS : Type 1, Type 2A, Type 2B and Type 3 were 38.2%, 48.37%, 12.4% and 1.1% respectively. In all cases, post-operative symptom duration ranged from 0 to 900 days, average was 74.6 days and median was 14 days. In case of Type 2, average post-operative symptom duration was 115.1 days and median was 42 days, being from 5 to 900 days. In type 2A, postoperative silent period ranged from 1 to 10 days, with an average of 2.4 days and a median of 2 days. CONCLUSION : Surgeons should be aware that delayed symptom disappearance after MVD for HFS is common and time course of symptom disappearance is various as well as unpredictable.