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Propofol: a new drug for sedation in the intensive care unit.

Patients in the ICU who require intubation and mechanical ventilation benefit from adequate sedation and analgesia. Traditionally, this has been achieved using benzodiazepines and opioids. Alternatively, propofol is being administered for sedation of patients in the ICU with increasing frequency. Propofol has a number of properties that make it a potentially superior choice for sedation of intubated ICU patients. The rapid onset and offset of sedation with propofol, even after prolonged administration, allow for greater control over the level of sedation and more rapid weaning from mechanical ventilation. In addition, long-term administration of propofol does not appear to be associated with the development of tolerance, addiction, or withdrawal following discontinuation. Propofol suppresses cellular oxygen consumption and carbon dioxide production without increasing anaerobic metabolism. This may be beneficial in patients with severe hypoxemia, hypercarbia, or myocardial ischemia. Finally, the use of propofol may reduce or eliminate the need for other medications in these patients such as muscle relaxants, antihypertensives, lipid nutritional supplements, and analgesics, thereby simplifying their medication regimens and reducing the overall cost of their care while in the ICU. Propofol can be administered to critically ill patients for sedation with a high degree of safety and efficacy. Propofol causes systemic vasodilatation which may result in unwanted hypotension, especially in patients who are already hemodynamically compromised. Propofol also causes ventilatory depression, so its use should be restricted in the ICU to patients whose airway is protected by an endotracheal tube and whose ventilation is closely monitored. Finally, continuous administration of propofol may cause clinically significant hypertriglyceridemia in patients with disordered triglyceride metabolism, or in patients receiving excessive doses of propofol or parenteral lipid supplements. Although propofol is more expensive than equipotent doses of other sedative agents, the additional cost of using propofol for sedation of critically ill patients in the ICU may be more than offset by the savings accrued from faster times to extubation, shorter ICU stays, and the use of fewer medications to manage these patients. Further research needs to be done to determine the potential clinical and cost benefits of using propofol for sedation of patients in the ICU.

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