B Acad Nat Med Paris
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B Acad Nat Med Paris · Mar 2014
Review[Tetrahydrocannabinol pharmacokinetics; new synthetic cannabinoids; road safety and cannabis].
Delta-9-tetrahydrocannabinol (THC) is the main psychoactive ingredient of cannabis, a drug which is commonly smoked This paper focuses on the pharmacokinetics of THC. The average THC content in cannabis plant material has risen by a factor offour over the past 20 years, from 4% to 16%. This increase has important implications not only for the pharmacokinetics but also for the pharmacology of THC The mean bioavailability of THC in smoked cannabis is about 25%. ⋯ Since 2009, synthetic cannabinoids have emerged on the illicit drug market. These substances act on the same CB1 receptors as THC, but with higher afinity. Their pharmacokinetics differs from that of THC, as they are metabolized into multiple derivatives, most of which are more active than THC itself.
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B Acad Nat Med Paris · Mar 2014
Biography Historical Article[Anomalous aortic origin of coronary arteries: a frequent and curable cause of sudden death].
Anomalous aortic origin of coronary arteries is a congenital heart defect in which one coronary artery arises from the opposite sinus (the left coronary artery from the right coronary sinus, or the right coronary artery from the left sinus). The initial segment of the abnormal artery courses between the great arteries and is usually located within the aortic wall. These anomalies are far from rare, affecting 0.1% to 0.3% of the population, and carry a high risk of sudden cardiac death. ⋯ Surgical treatment is relatively safe and provides satisfactory results, most patients having no residual myocardial ischemia under stress. Surgery is recommended for all patients with an anomalous left coronary artery, regardless of symptom status, as well as for symptomatic patients with an anomalous right coronary artery (aborted sudden death, symptoms under stress, myocardial ischemia under stress). Because of the incidence and severity of these anomalies, careful echocardiographic evaluation should be performed routinely, at least in young athletes.
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Management of patients with metastatic melanoma has improved radically in recent years with the development of new drugs capable of signifcantly prolonging life expectancy. Two strategies have been implemented: targeted anti-BRAF therapy for BRAF-mutated melanomas, and non specific immunotherapies based on anti-CTLA-4 (ipilimumab) and, more recently, anti-PD-1 monoclonal antibodies. These antibodies, by blocking physiological brakes on immune activation, induce an indirect immune response. ⋯ Anti-PD-1 antibodies presently in development seem to have a better therapeutic index, with higher response rates and less toxicity than ipilimumab. Combination therapy with anti-CTLA-4 and anti-PD-1 v is also giving encouraging preliminary results. In future, these new drugs will probably be used in combination, either concurrently or sequentially.
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The concept of disaster medicine, derivedfrom medical management of casualties caused by terrorist attacks or earthquakes, began to be taught in medical school in 1982. It adapts military intervention tactics to civilian practices, and differentiates major disasters (in which preformed teams are sent to the scene) from disasters with limited effects (predefined plans form the backbone of the rescue organization). ⋯ Predefined intervention teams and ad hoc materials have been created to provide autonomous logistic support. Regulations, ethical aspects and managerial methods still need to be refined, and research and teaching must be given a new impetus.