Microvascular decompression for trigeminal neuralgia, long-term follow-up results and assessment of possible prognostic factors: a single-center retrospective cross-sectional cohort study
Keywords:trigeminal neuralgia, microvascular decompression, prognostic factors
Aim: Prognostic factors detection and analysis of long-term results of microvascular decompression for trigeminal neuralgia.
Materials and methods. 161 cases of trigeminal neuralgia (TN) treatment by MVD technique without preliminary invasive interventions within 10 years were analyzed. Two blocks of information were designed which included objective case data (8 factors) and patient satisfaction survey (5 questions). Follow-up minimal cut-off was 1 year (median 5.8 years). The primary end point is the proportion of pain free patients and BNI (Barrow Neurological Institute) score at last follow-up. The secondary end point is the assessment of possible risk factors of treatment failure: symptoms duration, decompression type, affected nerve branches, neurovascular conflict visible on MRI, different indications for surgery. Logit-regression analysis was carried out. Significance level was set at p<0,01.
Results. Among the studied factors as predictors for pain recurrence all but one failed to reach significance threshold. Conflict on MRI (p=0,231), involved nerve branches (p=0,340), indications for surgery (p=0,659), number of involved vessels (p=0,834), achieved decompression type (p=0,157), venous compression (p=0,143), gender (p=0,150), affected side (p=0,934) did not reach the significance level. For symptoms duration p=0,0012.
Conclusions. As a result of multifactorial analysis of study results, the only significant prognostic factor for treatment failure (pain recurrence or worsening of obtained result) was symptoms duration at the time of surgery.
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