 Rationale: The drug etomidate causes increased mortality if used for continuous sedation in mechanically ventilated patients; however, etomidate continues to be widely used as a single-bolus induction agent for endotracheal intubation because of its favorable hemodynamic properties. Recent data have raised questions regarding the safety of using etomidate for even a single bolus in patients at risk of adrenal insufficiency, emphasizing the fact that single bolus doses of etomidate cause measurable adrenal suppression, and consequently may cause increases in vasopressor requirements and in hospital length of stay. Alternative FDA-approved induction agents, such as midazolam, may be safer than etomidate; however, no studies have formally compared these agents. 