• Eur J Pain · Feb 2010

    Randomized Controlled Trial

    Laser-evoked potentials as a tool for assessing the efficacy of antinociceptive drugs.

    • A Truini, G Panuccio, F Galeotti, M R Maluccio, F Sartucci, M Avoli, and G Cruccu.
    • Department of Neurological Sciences, La Sapienza University and IRCCS San Raffaele, Rome, Italy.
    • Eur J Pain. 2010 Feb 1;14(2):222-5.

    AbstractLaser-evoked potentials (LEPs) are brain responses to laser radiant heat pulses and reflect the activation of Adelta nociceptors. LEPs are to date the reference standard technique for studying nociceptive pathway function in patients with neuropathic pain. To find out whether LEPs also provide a useful neurophysiological tool for assessing antinociceptive drug efficacy, in this double-blind placebo-controlled study we measured changes induced by the analgesic tramadol on LEPs in 12 healthy subjects. We found that tramadol decreased the amplitude of LEPs, whereas placebo left LEPs unchanged. The opioid antagonist naloxone partially reversed the tramadol-induced LEP amplitude decrease. We conclude that LEPs may be reliably used in clinical practice and research for assessing the efficacy of antinociceptive drugs.

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