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Does Dexmedetomidine Provide Cardioprotection in Coronary Artery Bypass Grafting With Cardiopulmonary Bypass? A Pilot Study
Update time:2013-07-31 20:14:00   【 Font: Large  Medium Small

Objective

The purpose of this pilot study was to evaluate whether dexmedetomidine has a cardioprotective effect during coronary artery bypass graft surgery with cardiopulmonary bypass (CPB).

Design

A prospective, double-blind, randomized controlled trial.

Setting

A university hospital.

Participants

Thirty-eight patients undergoing coronary artery bypass graft surgery.

Interventions

Patients were randomized into 2 groups: dexmedetomidine and placebo groups. In the dexmedetomidine group, dexmedetomidine infusion was started by a loading dose of 0.5 μg/kg/10 min, followed by a continuous infusion of 0.5 μg/kg/h. The placebo group received the same volume of saline. Measurements of central venous pressure, mean pulmonary artery pressure (MPAP) and cardiac index were performed before and after dexmedetomidine loading dose and 2, 24 and 48 hours after CPB. Simultaneously, arterial blood was sampled for CK-MB, cardiac troponin T, and N-terminal probrain natriuretic peptide.

Measurements and Main Results

CK-MB, cardiac troponin T and N-terminal probrain natriuretic peptide values were elevated in the periods after CPB in both groups (p

Conclusions

Myocardial damage was not reduced by administration of 0.5 μg/kg loading dose and 0.5 μg/kg/h infusion of dexmedetomidine. However MPAP tended to be lower in the dexmedetomidine group. Large-scale clinical outcome studies are indicated to confirm the effect of dexmedetomidine.

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Source:Journal of Cardiothoracic and Vascular Anesthesia      by Z Tosun, M Baktir, HC Kahraman, et al.
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