Chronic peripheral neuropathic pain was associated with a significantly lower global power spectrum in the low beta (13-20 Hz) frequency sub-band compared to healthy controls (-4.7 dB vs -1.4 dB, p=0.004).
Case-Control (n=22)
No
Is beta electroencephalographic oscillation altered in patients with chronic peripheral neuropathic pain compared to healthy controls?
Low beta EEG oscillation is significantly decreased in patients with chronic neuropathic pain and correlates with pain intensity, suggesting its potential as a GABAergic biomarker for pain.
Absolute Event Rate: -4.7% vs -1.4%
p-value: p=0.004
This preliminary investigation aimed to assess beta (β) oscillation, a marker of the brain GABAergic signaling, as a potential objective pain marker, hence contributing at the same time to the mechanistic approach of pain management. This case–control observational study measured β electroencephalographic (EEG) oscillation in 12 right-handed adult male with chronic neuropathic pain and 10 matched controls (∼55 years). Participants were submitted to clinical evaluation (pain visual analog scale, Hospital Anxiety, and Depression scale) and a 24-min high-density EEG recording (BIOSEMI). Data were analyzed using the EEGlab toolbox (MATLAB), SPSS, and R. The global power spectrum computed within the low (Lβ, 13–20 Hz) and the high (Hβ, 20–30 Hz) β frequency sub-bands was significantly lower in patients than in controls, and accordingly, Lβ was negatively correlated to the pain visual analog scale ( R = −0.931, p = 0.007), whereas Hβ correlation was at the edge of significance ( R = −0.805; p = 0.053). Patients’ anxiety was correlated to pain intensity ( R = 0.755; p = 0.003). Normalization of the low and high β global power spectrum (GPS) to the GPS of the full frequency range, while confirming the significant Lβ power decrease in chronic neuropathic pain patients, vanished the significance of the Hβ decrease, as well as the correlation between Lβ power and pain intensity. Our results suggest that the GABAergic Lβ EEG oscillation is affected by chronic neuropathic pain. Confirming the Lβ GPS decrease and the correlation with pain intensity in larger studies would open new opportunities for the clinical application of gamma-aminobutyric acid-modifying therapies.
Teixeira et al. (Fri,) conducted a case-control in Chronic Peripheral Neuropathic Pain (n=22). Chronic peripheral neuropathic pain vs. Healthy matched controls was evaluated on Low beta (Lβ, 13–20 Hz) global power spectrum (dB) (p=0.004). Chronic peripheral neuropathic pain was associated with a significantly lower global power spectrum in the low beta (13-20 Hz) frequency sub-band compared to healthy controls (-4.7 dB vs -1.4 dB, p=0.004).