Cela fait 180 ans qu’on endort des patients. Et on ne comprend toujours pas complètement comment cela fonctionne.
Commentaire sur le manque d’explication mécanistique en anesthésie générale
DOI :
https://doi.org/10.18192/osurj.v5i1.8083Résumé
L’anesthésie générale est l’une des plus grandes réussites de la médecine moderne. Chaque jour, des patients sont rendus inconscients, maintenus immobiles et sans douleur pendant une chirurgie, puis ramenés à l’état d’éveil sans souvenir de l’opération elle-même. Sur le plan clinique, cette pratique fonctionne remarquablement bien. La question plus difficile est de comprendre pourquoi elle fonctionne. Nous pouvons décrire plusieurs médicaments, récepteurs et modèles d’activité cérébrale impliqués, mais l’explication reste incomplète lorsqu’on essaie de relier l’effet moléculaire d’un anesthésique à la disparition vécue de la conscience.
Ce commentaire examine cet écart en trois étapes. Il présente d’abord le passage de l’ancienne théorie lipidique de Meyer-Overton vers des explications centrées sur les récepteurs, comme les récepteurs GABA-A et NMDA. Il explique ensuite pourquoi la pharmacologie des récepteurs, à elle seule, ne suffit pas à expliquer complètement l’état anesthésique, surtout parce que l’inconscience, l’immobilité, l’amnésie et l’analgésie sont des effets qui peuvent être en partie séparés. Enfin, il aborde un problème plus profond : l’anesthésie retire la conscience, mais les neurosciences ne possèdent toujours pas de théorie complète de ce qu’est la conscience. L’idée n’est donc pas de dire que l’anesthésie est dangereuse ou entièrement mystérieuse, mais plutôt de montrer qu’un écart mécanistique important demeure, malgré les grands progrès cliniques et scientifiques.
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