Percutaneous stereotactic radiofrequency thermal rhizotomy for the treatment of trigeminal neuralgia.

BACKGROUND: Trigeminal neuralgia (TN) is the most common cephalic neuralgia in people over the age of fifty, with a mean incidence of 4 per 100,000. Percutaneous stereotactic differential radiofrequency thermal rhizotomy (RTR) is a well-recognized surgical treatment for TN. The purpose of this study was to evaluate a management algorithm for TN and to evaluate the effectiveness of RTR for TN after failure of pharmacologic management.

METHODS: Two hundred and fifty-eight (258) patients underwent RTR from 1992-1996 and were prospectively evaluated. These patients were characterized by age, sex, side of the face and division(s) involved. Patients were evaluated for pain relief, recurrence requiring or not requiring re-operation, and the type and rate of complications. They were followed by serial clinical evaluation and telephone interview. Patients were grouped according to results: (A) Successful Result--excellent or good pain relief; (B) Unsuccessful Result--fair, poor or no pain relief. The RTR group was compared to historical controls. Follow-up ranged from 12-80 months (mean = 38 months).

RESULTS: At early follow-up (defined as median postoperative period up to 6 months), pain relief that was excellent or good (successful results) occurred in 224/258 (87%). At long-term follow-up (> 6 months) recurrence of tic pain required re-operation in 31 patients (12%). In 37 patients (14%), recurrence of tic pain did not require re-operation. Dysesthesia developed in 20 patients (8%); corneal analgesia developed in 8 patients (3%). "Anesthesia dolorosa" developed in 5 patients (2%) and was medically managed. At the conclusion of the long-term follow-up period, 214/258 patients (83%) had excellent to good pain relief (successful result). There were no mortalities, no significant morbidity and a low rate of minor complications.

CONCLUSION: With the use of this specific diagnostic and management algorithm, patients with TN can be successfully managed with RTR.