What is the clinical evidence from this study?

Study design: Observational. Population: Postherpetic neuralgia (n=38). Primary outcome: EEG power spectral density and functional connectivity (p=<0.05).

July 24, 2025Frontiers in Pain Research1 citationsOpen Access

Altered neural oscillation patterns and functional connectivity in postherpetic neuralgia: evidence from resting-state EEG

Q: What are the key findings of this study?

Patients with postherpetic neuralgia exhibited significantly higher EEG power across multiple frequency bands and reduced gamma-band functional connectivity compared to healthy controls.

FGFei GaoCardiac Imaging MWMengru WangAnhui Jianzhu University HJHuibin JiaHenan University

Key Result

Patients with postherpetic neuralgia exhibited significantly higher EEG power across multiple frequency bands and reduced gamma-band functional connectivity compared to healthy controls.

Study Design

Type

Observational (n=38)

Structured PICO

Does resting-state EEG reveal altered neural oscillation patterns and functional connectivity in patients with postherpetic neuralgia compared to healthy controls?

Population

21 patients with postherpetic neuralgia (PHN) (mean age 69.10 ± 11.19 years, 11 female) and 17 healthy controls (mean age 64.47 ± 10.04 years, 6 female).

Intervention

Resting-state electroencephalography (EEG) assessment

Comparator

Healthy controls

Outcome

Neural oscillatory activity (power spectrum density) and functional connectivity patterns (weighted phase lag index)surrogate

Patients with postherpetic neuralgia exhibit widespread hyperactivity in neural circuits and disrupted interregional communication, which correlates with psychological comorbidities like depression and anxiety.

Main Result

p-value: p=<0.05

Limitations

Patients were not medication-free at the time of the study.
Selection criterion for connectivity analysis may limit generalizability to the entire brain network.
EEG data was collected at resting state, making functional interpretations preliminary.
Correlational nature of the analysis limits causal inferences.

Abstract

Postherpetic neuralgia (PHN) is a debilitating chronic pain condition that significantly affects the quality of life, often leading to physical discomfort, emotional distress, and psychological comorbidities, such as depression and anxiety. This study aimed to systematically assess the neural oscillatory activity and functional connectivity patterns in patients with PHN using resting-state electroencephalography (EEG). Overall, 21 patients with PHN and 17 healthy controls participated in this study. Resting-state EEG data were collected and analyzed. Power spectrum density analysis was conducted to compare frequency band activity, and correlation analyses were used to examine associations between EEG power and psychological symptoms. Functional connectivity was assessed using the weighted phase lag index. Power spectrum density analysis revealed significantly higher EEG power across the delta, theta, alpha, beta, and gamma frequency bands in patients with PHN compared with controls. Correlation analyses indicated that delta and theta frequency band power were positively associated with the Beck Depression Inventory scores, whereas delta frequency band power was negatively correlated with the State Anxiety Inventory scores. Additionally, functional connectivity analysis demonstrated reduced gamma-band connectivity in patients with PHN, particularly in regions of the sensorimotor and pain modulation networks. These findings suggest that PHN is characterized by widespread hyperactivity in neural circuits, accompanied by disrupted interregional communication. These results provide valuable insights into the neurophysiological mechanisms underlying PHN and highlight potential biomarkers for developing targeted neuromodulatory treatments to alleviate pain and improve the psychological well-being of affected individuals.

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