Economic evaluation of dexmedetomidine relative to midazolam for sedation in the intensive care unit.

BACKGROUND Dexmedetomidine is an α(2)-receptor agonist administered by continuous infusion in the intensive care unit (ICU) for sedation of critically ill patients who are undergoing mechanical ventilation following intubation. Relative to ICU patients receiving midazolam (a γ-aminobutyric acid agonist) for sedation, those receiving dexmedetomidine spent less time on ventilation, had fewer episodes of delirium, and had a lower incidence of tachycardia and hypertension. OBJECTIVE To assess the economic impact, in a Canadian context, of dexmedetomidine, relative to midazolam, for sedation in the ICU. METHODS This economic evaluation was based on a cost-consequences analysis, from the perspective of the Canadian health care system. The selected time horizon was an ICU stay (maximum 30 days). Clinical data were obtained from a previously published prospective, randomized, double-blind trial comparing dexmedetomidine and midazolam. This evaluation considered the costs of the medications, mechanical ventilation, and delirium episodes, as well as costs associated with adverse events requiring an intervention. All costs were adjusted to 2010 and are reported in Canadian dollars. RESULTS The average cost of the medication was higher for dexmedetomidine than midazolam ($1929.57 versus $180.10 per patient), but the average costs associated with mechanical ventilation and management of delirium were lower with dexmedetomidine than with midazolam ($2939 versus $4448 for ventilation; $2127 versus $3012 for delirium). The overall cost per patient was lower with dexmedetomidine than with midazolam ($7022 versus $7680). Deterministic sensitivity analysis confirmed the robustness of the difference. CONCLUSIONS The use of dexmedetomidine was, in most contexts, a more favourable strategy than the use of midazolam, in terms of clinical consequences and economic impact. Dexmedetomidine was less expensive than midazolam and was associated with lower occurrence of delirium and shorter duration of mechanical ventilation.