# Nociception-specific blink reflex: pharmacology in healthy volunteers

## TL;DR

This study examines how different drugs affect a blink reflex linked to pain perception in humans, focusing on its potential for understanding headache disorders.

## Contribution

The study demonstrates that benzodiazepine receptor modulation affects the nociception-specific blink reflex without involving opioid or glutamate receptors.

## Key findings

- Diazepam significantly reduced the ipsilateral blink reflex area under the curve compared to placebo.
- Blink reflex changes suggest central modulation of trigeminal nociception by benzodiazepines.
- Psychometric parameters like alertness and reaction time were unaffected by the tested drugs.

## Abstract

The physiology and pharmacology of activation or perception of activation of pain-coding trigeminovascular afferents in humans is fundamental to understanding the biology of headache and developing new treatments.

The blink reflex was elicited using a concentric electrode and recorded in four separate sessions, at baseline and two minutes after administration of ramped doses of diazepam (final dose 0.07 mg/kg), fentanyl (final dose 1.11 μg/kg), ketamine (final dose 0.084 mg/kg) and 0.9 % saline solution. The AUC (area under the curve, μV*ms) and the latency (ms) of the ipsi- and contralateral R2 component of the blink reflex were calculated by PC-based offline analysis. Immediately after each block of blink reflex recordings certain psychometric parameters were assessed.

There was an effect due to DRUG on the ipsilateral (F3,60 = 7.3, P < 0.001) AUC as well as on the contralateral (F3,60 = 6.02, P < 0.001) AUC across the study.

A significant decrement in comparison to placebo was observed only for diazepam, affecting the ipsilateral AUC. The scores of alertness, calmness, contentedness, reaction time and precision were not affected by the DRUG across the sessions.

Previous studies suggest central, rather than peripheral changes in nociceptive trigeminal transmission in migraine. This study demonstrates a robust effect of benzodiazepine receptor modulation of the nociception specific blink reflex (nBR) without any μ-opiate or glutamate NMDA receptor component. The nociception specific blink reflex offers a reproducible, quantifiable method of assessment of trigeminal nociceptive system in humans that can be used to dissect pharmacology relevant to primary headache disorders.