Ictal analgesia in temporal lobe epilepsy - The mechanism of seizure-related burns

Med Hypotheses. 2015 Aug;85(2):173-7. doi: 10.1016/j.mehy.2015.04.023. Epub 2015 Apr 28.

Abstract

Seizure-related injuries have major impact in the excess mortality and morbidity of epilepsy patients. Experimental data suggest that analgesia may develop during seizures contributing to the severity of seizure-related accidents, especially burns. We aimed to identify those seizure-types that may lead to burn-injuries by seizure-related analgesia. In our tertiary epilepsy centre, we asked 100 epilepsy patients having a history of seizure-related injury, to complete our burn-and-pain questionnaire. Fifty-one patients completed the survey; their epileptology data were collected and those with a seizure-related burn were interviewed. Forty-two out of the 51 patients (82%) had partial epilepsy and 9 (18%) had idiopathic generalised epilepsy. Twenty-six persons (51%) reported decreased pain perception during or after seizures in general. Twelve patients (23%) had suffered one or more seizure-related burn. Five of them fell onto a hot surface or fire accidentally, during generalized tonic-clonic seizures. Seven out of the 12 burnt patients (58%) grasped a hot object or reached into boiling fluid during complex partial seizures; without experiencing-, or reacting in response to pain. These patients had temporal lobe epilepsy, 5 of them had left temporal seizure onset. Our hypothesis based on the circumstantial analysis of our patients' burn-injuries; is that temporal lobe seizures may cause ictal/postictal analgesia. It may be caused by the seizure-related epileptic facilitation of the periaqueductal gray matter; the central pain-inhibiting structure of the brain. Seizure-related endogenous opioid-release my have a contributory role in inhibiting pain-perception. Ictal analgesia warrants better burn-prevention in temporal lobe epilepsy patients. Understanding the mechanism of ictal analgesia and specifying those seizures-types prone to cause it; may help indentifying human pain-inhibiting pathways.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Physiological
  • Adult
  • Aged
  • Analgesia / methods
  • Brain / physiopathology*
  • Burns / complications*
  • Burns / physiopathology*
  • Epilepsy, Temporal Lobe / etiology*
  • Epilepsy, Temporal Lobe / physiopathology*
  • Evidence-Based Medicine
  • Female
  • Humans
  • Male
  • Middle Aged
  • Models, Neurological
  • Pain / etiology
  • Pain / physiopathology*
  • Pain / prevention & control
  • Pain Perception
  • Young Adult