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Ketamine has a long history as a veterinary tranquilizer and is familiar to emergency physicians because it is a frequently used, safe, effective agent for procedural sedation and rapid sequence intubation. But can it be used to control behavior in severely agitated patients? In a prior summary of a study on this topic (NEJM JW Emerg Med Mar 2016 and Ann Emerg Med 2016; 67:581), we raised concerns about ketamine's propensity to cause endogenous catecholamine release — what might happen when agitated patients are exposed to even more catecholamines? Now investigators report on a small prospective observational study comparing five regimens for sedation of acutely agitated patients: ketamine (24 patients), lorazepam (33), midazolam (17), halo…