Historique
Périodique
Beyond the K-hole: a 3-year longitudinal investigation of the cognitive and subjective effects of ketamine in recreational users who have substantially reduced their use of the drug
(Une étude longitudinale sur 3 ans des effets cognitifs et subjectifs de la kétamine chez des usagers récréatifs qui ont diminué substantiellement leur consommation.)
Auteur(s) :
MORGAN, C. J. A. ;
MONAGHAN, L. ;
CURRAN, H. V.
Année
2004
Page(s) :
1450-1461
Langue(s) :
Anglais
Refs biblio. :
47
Domaine :
Drogues illicites / Illicit drugs
Discipline :
PRO (Produits, mode d'action, méthode de dépistage / Substances, action mode, screening methods)
Note générale :
Addiction, 2004, 99, (11), 1450-1461
Note de contenu :
fig. ; tabl.
Résumé :
FRANÇAIS :
Létude a porté sur 18 usagers de kétamine qui avaient réduit leur consommation en moyenne de 88,3%. Les atteintes de la mémoire sémantique sont réversibles alors que les atteintes de la mémoire épisodique et de lattention durent plus longtemps.
ENGLISH :
Rationale: Ketamine is a dissociative anaesthetic that is also a drug of abuse. Previous studies have demonstrated persisting episodic and semantic memory impairments in recreational ketamine users 3 days after taking ketamine. However, the degree to which these deficits might be reversible upon reduction or cessation of ketamine use was not known. Objective: To follow-up a population of ketamine users tested 3 years previously and examine whether impairments observed 3 days after drug use are enduring or reversible. Methods: Eighteen ketamine users and 10 polydrug controls from studies conducted between 3 and 4 years earlier were re-tested on the same battery of cognitive tasks and subjective measures. These tapped episodic, semantic and working memory and executive and attentional functioning. Subjective schizotypal, dissociative, mood and bodily symptoms were also examined and a drug use history recorded. Results: The ketamine users had reduced their frequency of use of ketamine by an average of 88.3%. Performance of ketamine users on tasks tapping semantic memory had improved and this improvement was correlated with their reduction in ketamine use. On tasks tapping episodic memory and attentional functioning, ketamine users still showed deficits compared to polydrug controls. Higher levels of schizotypal symptoms and perceptual distortions were exhibited by the ketamine group, although dissociative symptoms were similar to controls. Conclusions: These findings indicate that semantic memory impairments associated with recreational ketamine are reversible upon marked reduction of use; however, impairments to episodic memory and possibly attentional functioning appear long-lasting. In addition, schizotypal symptoms and perceptual distortions may persist after cessation of ketamine use. Ketamine users, or potential users, should be aware of the enduring effects of this drug on aspects of memory and subjective experience. (Author' s abstract)
Létude a porté sur 18 usagers de kétamine qui avaient réduit leur consommation en moyenne de 88,3%. Les atteintes de la mémoire sémantique sont réversibles alors que les atteintes de la mémoire épisodique et de lattention durent plus longtemps.
ENGLISH :
Rationale: Ketamine is a dissociative anaesthetic that is also a drug of abuse. Previous studies have demonstrated persisting episodic and semantic memory impairments in recreational ketamine users 3 days after taking ketamine. However, the degree to which these deficits might be reversible upon reduction or cessation of ketamine use was not known. Objective: To follow-up a population of ketamine users tested 3 years previously and examine whether impairments observed 3 days after drug use are enduring or reversible. Methods: Eighteen ketamine users and 10 polydrug controls from studies conducted between 3 and 4 years earlier were re-tested on the same battery of cognitive tasks and subjective measures. These tapped episodic, semantic and working memory and executive and attentional functioning. Subjective schizotypal, dissociative, mood and bodily symptoms were also examined and a drug use history recorded. Results: The ketamine users had reduced their frequency of use of ketamine by an average of 88.3%. Performance of ketamine users on tasks tapping semantic memory had improved and this improvement was correlated with their reduction in ketamine use. On tasks tapping episodic memory and attentional functioning, ketamine users still showed deficits compared to polydrug controls. Higher levels of schizotypal symptoms and perceptual distortions were exhibited by the ketamine group, although dissociative symptoms were similar to controls. Conclusions: These findings indicate that semantic memory impairments associated with recreational ketamine are reversible upon marked reduction of use; however, impairments to episodic memory and possibly attentional functioning appear long-lasting. In addition, schizotypal symptoms and perceptual distortions may persist after cessation of ketamine use. Ketamine users, or potential users, should be aware of the enduring effects of this drug on aspects of memory and subjective experience. (Author' s abstract)
Affiliation :
Clinical Psychopharmacology Unit, Clinical Health Psychology, Univ. College London, Gower Street, London WC1E 6BT
Royaume-Uni. United Kingdom.
Royaume-Uni. United Kingdom.