Comparison of Two Types of Radiofrequency Treatment for Trigeminal Neuralgia

Trigeminal neuralgia (TN) is a debilitating neuropathic condition characterized by recurrent episodes of severe, lancinating facial pain in the distribution of one or more branches of the trigeminal nerve. Although most patients initially respond to medical therapy such as carbamazepine or oxcarbazepine, a subset remains refractory and requires interventional treatment.

Radiofrequency ablation (RFA) has been widely used in the management of refractory TN, especially conventional thermal RFA targeting the Gasserian ganglion. While this approach offers substantial pain relief, it may lead to complications such as facial numbness, dysesthesia, or weakness due to irreversible nerve damage. As an alternative, pulsed RFA (PRF) offers neuromodulation without causing structural nerve injury and is often preferred for peripheral branch interventions.

This retrospective cohort study aims to compare the effectiveness and safety of two RFA techniques in patients with classical TN:

Group A: Conventional RFA applied to the Gasserian ganglion

Group B: Pulsed RFA applied peripherally to the affected branch (V1, V2, or V3)

Patients were selected from the records of the Pain Clinic of Mersin University Faculty of Medicine between January 1, 2015, and June 1, 2025. A total of 60 patients aged 55-80 years, who had been diagnosed with classical TN (per ICHD-3 criteria), were included. All patients had failed medical management for at least 6 months and underwent either of the RFA techniques described above. Patients with secondary TN, prior craniofacial surgery, or missing follow-up data were excluded.

PRF was specifically chosen for peripheral interventions in our clinic to avoid thermal-related complications. PRF was applied at 42°C for two cycles of 120 seconds. Thermal RFA was applied with standard lesioning parameters following contrast-confirmed Gasserian ganglion targeting.

Outcome measures included:

Primary: Pain relief measured using a numerical rating scale (NRS) at baseline and 6 months post-procedure

Secondary: Patient satisfaction (5-point Likert scale), rate of complications, and recurrence of pain requiring reintervention

All procedures were performed under fluoroscopic guidance by experienced pain specialists. Data was extracted from electronic records and procedure reports. Statistical comparisons will be made using appropriate parametric or non-parametric tests based on data distribution.

This study seeks to contribute real-world evidence to guide clinicians in selecting safer, more effective RFA strategies for managing TN, particularly in patients at risk for complications or those preferring less invasive approaches.