To investigate the related factors affecting the efficacy of microvascular decompression (MVD) in the treatment of primary trigeminal neuralgia (TN).

MVD was performed in 120 patients with primary TN and single factor χ² test and Logistic regression analysis were performed on the clinical data to evaluate the independent risk factors influencing the efficacy of MVD in the treatment of primary TN.

The pain completely disappeared in 101 cases, the pain was relieved in 16 cases and the unhealed in 3 cases. Sixty cases had pure arterial compression,57 cases had venous compression, and 3 cases had no obvious responsibility vessel. Complete elimination of pain in the patients with venous compressionwaslower than that in patients with pure arterial oppression: 73.7% (42/57) vs. 86.7% (52/60), and the difference was statistically significant (P < 0.05). The complete pain relief rate in patients with V2 bronchial pain was lower than that in other pain distribution areas: 13/19 vs. 87.1%(88/101), With significant difference (P < 0.05). In patients with V2 bronchitis, the responsible vessels were mostly compressed from the ventral surface of the trigeminal nerve, and the difference was statistically significant (P < 0.05). Logistic regression analysis showed, Venous compression and V2 pain were the independent risk factors influencing the clinical efficacy of MVD in the treatment of primary TN.

Patients with venous compression and V2 pain are less likely to havegood postoperative outcomes, and venous compression and V2 painare independent risk factors. In patients with V2 pain, the responsible vasculature tends to ventrally massage the trigeminal nerve, which is a new study direction of refractory V2 pain.

Trigeminal neuralgia; Vein; Microvascular decompression; Maxillary branch; Analysis of curative effect