# The Factors Influencing the Efficacy of Pregabalin Combined With Lidocaine in the Treatment of Postherpetic Neuralgia Patients: An Analysis

## TL;DR

This study identifies key factors affecting how well pregabalin and lidocaine treat postherpetic neuralgia, including age, pain severity, and immune-related conditions.

## Contribution

The study identifies specific clinical factors that predict treatment success in postherpetic neuralgia patients using pregabalin and lidocaine.

## Key findings

- 79.38% of patients responded positively to the combined treatment.
- Age, illness duration, pain severity, and immunosuppressive diseases significantly influence treatment effectiveness.
- Combined factors show higher predictive value (AUC = 0.734) for treatment outcomes.

## Abstract

This study aims to analyze the primary factors influencing the therapeutic effect of pregabalin combined with lidocaine in patients with post‐herpetic neuralgia (PHN).

Clinical data of 97 PHN patients admitted to our hospital from January 2022 to October 2024 were retrospectively analyzed. All patients received pregabalin combined with lidocaine treatment. Treatment efficacy was assessed using the numerical rating scale (NRS) for pain, dividing patients into effective (≥ 50% NRS reduction) and ineffective groups. Univariate and multivariate logistic regression analyses identified the main influencing factors. Pearson correlation analysis explored relationships between factors and therapeutic effect. Receiver operating characteristic (ROC) curves evaluated predictive values.

Posttreatment, 77 patients (79.38%) were classified as responders, while 20 (20.62%) were nonresponders. Age (OR: 0.163, 95% CI: 0.036–0.535), illness duration (OR: 0.098, 95% CI: 0.015–0.369), pain severity (OR: 2.794, 95% CI: 1.362–6.566), and presence of concomitant immunosuppressive diseases (OR: 0.194, 95% CI: 0.030–0.742) were key determinants. Positive correlations were found between illness duration (r = 0.352), pain severity (r = −0.279), immunosuppressive diseases (r = 0.231), and treatment effectiveness (p < 0.05). Age showed a negative correlation (r = 0.301, p < 0.05). ROC curves indicated AUCs for age, illness duration, pain severity, and immunosuppressive diseases were 0.685, 0.716, 0.691, and 0.368, respectively. Combined, these factors had a higher predictive value (AUC = 0.734).

Age ≥ 65 years, illness duration ≥ 3 months, severe pain, and the presence of concomitant diseases causing immunosuppression are the main factors influencing the effectiveness of combined pregabalin and lidocaine treatment for PHN.