44
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Êxtase (MDMA): efeitos farmacológicos e tóxicos, mecanismo de ação e abordagem clínica Translated title: Ecstasy (MDMA): pharmacological and toxic effects, mechanism of action and clinical management

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          CONTEXTO: O 3,4-metilenodioximetanfetamina (MDMA, êxtase) é um derivado da anfetamina, cujo consumo por jovens tem aumentado. OBJETIVOS: Conduzir uma revisão de literatura sobre os aspectos farmacológicos e fisiopatológicos do MDMA, incluindo o mecanismo de ação que possa explicar os efeitos neurotóxicos e a toxicidade aguda e a longo prazo. MÉTODOS: Revisão da literatura usando as palavras-chave: 3,4-methylenedioxymethamphetamine, ecstasy, neurotoxicity, intoxication, drug abuse, por intermédio do MEDLINE e LILACS. A busca incluiu todos os artigos publicados no período entre 1985 e 2007. RESULTADOS: Ainda existem muitas questões sem respostas sobre a farmacologia do êxtase e a fisiopatologia dos efeitos tóxicos dessa substância. A simples descrição do mecanismo de ação é insuficiente para explicar todos os efeitos induzidos pelo êxtase. O mecanismo exato responsável por mediar os efeitos tóxicos do MDMA sobre os neurônios da serotonina precisa ser elucidado. CONCLUSÕES: Existem poucas informações na literatura sobre a farmacologia e o mecanismo de ação do MDMA que possam explicar os efeitos neurotóxicos e outros efeitos fisiopatológicos. São necessários mais estudos para que o profissional de saúde possa obter informações e conhecimentos a fim de combater os efeitos terríveis do êxtase na população jovem vulnerável.

          Translated abstract

          BACKGROUND: The consumption of the amphetamine derivative 3,4-methylenedioxymethamphetamine (MDMA, ecstasy) by young people increased in the past years. OBJECTIVES: To conduct a literature review on the pharmacology of MDMA and particularly with respect to the putative mechanism of action implicated in the acute and long-term toxicity and neurotoxic effects. METHODS: A literature review using the key words: 3,4-methylenedioxymethamphetamine, ecstasy, neurotoxicity, intoxication, abuse drugs was performed in the databases MEDLINE and LILACS. The search covered all articles published between 1985 and 2007. RESULTS: There were still many unanswered questions regarding the pharmacology of ecstasy and the pathophysiology of its toxic effects. The fundamental mechanism of action is insufficient to explain all effects induced by the drug. The exact mechanism responsible for mediating the toxic effects of MDMA on 5-HT neurons remain to be elucidated. DISCUSSION: There is limited information in published literature about the underlying pharmacology and mechanism of action that could account for the neurotoxic and other phathophysiological effect of MDMA.

          Related collections

          Most cited references76

          • Record: found
          • Abstract: found
          • Article: not found

          Right bundle branch block, persistent ST segment elevation and sudden cardiac death: a distinct clinical and electrocardiographic syndrome. A multicenter report.

          The objectives of this study were to present data on eight patients with recurrent episodes of aborted sudden death unexplainable by currently known diseases whose common clinical and electrocardiographic (ECG) features define them as having a distinct syndrome different from idiopathic ventricular fibrillation. Among patients with ventricular arrhythmias who have no structural heart disease, several subgroups have been defined. The present patients constitute an additional subgroup with these findings. The study group consisted of eight patients, six male and two female, with recurrent episodes of aborted sudden death. Clinical and laboratory data and results of electrocardiography, electrophysiology, echocardiography, angiography, histologic study and exercise testing were available in most cases. The ECG during sinus rhythm showed right bundle branch block, normal QT interval and persistent ST segment elevation in precordial leads V1 to V2-V3 not explainable by electrolyte disturbances, ischemia or structural heart disease. No histologic abnormalities were found in the four patients in whom ventricular biopsies were performed. The arrhythmia leading to (aborted) sudden death was a rapid polymorphic ventricular tachycardia initiating after a short coupled ventricular extrasystole. A similar arrhythmia was initiated by two to three ventricular extrastimuli in four of the seven patients studied by programmed electrical stimulation. Four patients had a prolonged HV interval during sinus rhythm. One patient receiving amiodarone died suddenly during implantation of a demand ventricular pacemaker. The arrhythmia of two patients was controlled with a beta-adrenergic blocking agent. Four patients received an implantable defibrillator that was subsequently used by one of them, and all four are alive. The remaining patient received a demand ventricular pacemaker and his arrhythmia is controlled with amiodarone and diphenylhydantoin. Common clinical and ECG features define a distinct syndrome in this group of patients. Its causes remain unknown.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Monoamine oxidase inhibitors, opioid analgesics and serotonin toxicity.

            Toxicity resulting from excessive intra-synaptic serotonin, historically referred to as serotonin syndrome, is now understood to be an intra-synaptic serotonin concentration-related phenomenon. Recent research more clearly delineates serotonin toxicity as a discreet toxidrome characterized by clonus, hyper-reflexia, hyperthermia and agitation. Serotonergic side-effects occur with serotonergic drugs, and overdoses of serotonin re-uptake inhibitors (SRIs) frequently produce marked serotonergic side-effects, and in 15% of cases, moderate serotonergic toxicity, but not to a severe degree, which produces hyperthermia and risk of death. It is only combinations of serotonergic drugs acting by different mechanisms that are capable of raising intra-synaptic serotonin to a level that is life threatening. The combination that most commonly does this is a monoamine oxidase inhibitor (MAOI) drug combined with any SRI. There are a number of lesser-known drugs that are MAOIs, such as linezolid and moclobemide; and some opioid analgesics have serotonergic activity. These properties when combined can precipitate life threatening serotonin toxicity. Possibly preventable deaths are still occurring. Knowledge of the properties of these drugs will therefore help to ensure that problems can be avoided in most clinical situations, and treated appropriately (with 5-HT(2A) antagonists for severe cases) if they occur. The phenylpiperidine series opioids, pethidine (meperidine), tramadol, methadone and dextromethorphan and propoxyphene, appear to be weak serotonin re-uptake inhibitors and have all been involved in serotonin toxicity reactions with MAOIs (including some fatalities). Morphine, codeine, oxycodone and buprenorphine are known not to be SRIs, and do not precipitate serotonin toxicity with MAOIs.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Ecstasy (MDMA): a review of its possible persistent psychological effects.

              Recreational use of "ecstasy" (3,4-methylenedioxymethamphetamine; MDMA) has become increasingly widespread. Until recently, however, little was known about the possible persistent psychological effects of extensive use of this drug. The aim of the present review is to evaluate recent empirical evidence concerning the persistent psychological sequelae of recreational ecstasy use. The methodologies of open trial studies of recreational ecstasy users are evaluated and reports of the presence or absence of persistent psychological problems are related to the extent of past exposure to ecstasy. There is growing evidence that chronic, heavy, recreational use of ecstasy is associated with sleep disorders, depressed mood, persistent elevation of anxiety, impulsiveness and hostility, and selective impairment of episodic memory, working memory and attention. There is tentative evidence that these cognitive deficits persist for at least 6 months after abstinence, whereas anxiety and hostility remit after a year of abstinence. The possibility that some of these psychological problems are caused by ecstasy-induced neurotoxicity is supported by preclinical evidence of MDMA-induced neurotoxicity and behavioural deficits, evidence of depleted serotonin in heavy ecstasy users, and by dose-response relationships between the extent of exposure to ecstasy and the severity of cognitive impairments. An increasing number of young, heavy ecstasy users are at significant risk of persistent cognitive impairments and disturbances of affect and personality. Some of these problems may remit after abstinence, but residual neurotoxicity and decline of serotonergic function with age may result in recurrent psychopathology and premature cognitive decline.
                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rpc
                Archives of Clinical Psychiatry (São Paulo)
                Arch. Clin. Psychiatry (São Paulo)
                Faculdade de Medicina da Universidade de São Paulo (São Paulo )
                1806-938X
                2008
                : 35
                : 3
                : 96-103
                Affiliations
                [1 ] Universidade do Estado do Rio Grande do Norte Brazil
                [2 ] Universidade Federal do Ceará Brazil
                [3 ] Universidade Federal do Ceará Brazil
                [4 ] Universidade Federal do Ceará Brazil
                Article
                S0101-60832008000300002
                10.1590/S0101-60832008000300002
                5241a472-bdbd-4a1a-896f-e67bbd107d57

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0101-6083&lng=en
                Categories
                MEDICINE, GENERAL & INTERNAL
                PSYCHIATRY

                Internal medicine,Clinical Psychology & Psychiatry
                3,4-methylenedioxymethamphetamine,ecstasy,neurotoxicity,intoxication,drug abuse,3,4-metilenodioximetanfetamina,êxtase,neurotoxicidade,intoxicação,abuso de drogas

                Comments

                Comment on this article