右美托咪啶对非体外循环冠状动脉旁路移植术患者心肌损伤的影响

目的 评价右美托咪啶对非体外循环冠状动脉旁路移植术患者心肌损伤的影响.方法 择期非体外循环冠状动脉旁路移植术患者46例,性别不限,ASA分级Ⅱ或Ⅲ级,年龄37～64岁,采用随机数字表法,将其随机分为2组(n=23),两组麻醉诱导及麻醉维持方法相同.右美托眯啶组(D组)于麻醉诱导后持续静脉输注右美托咪啶0.5 μg·kg-1∶h-1至术毕,对照组(C组)给予等容量生理盐水.分别于手术开始、血管吻合完毕、血管吻合完毕后30 min和术毕时记录平均肺动脉压、肺毛细血管楔压;中心静脉压和心输出量,计算每搏指数、左室每搏功指数、右室每搏功指数、周围血管阻力和肺血管阻力.分别于麻醉诱导前、术毕、术后4 h和术后24 h时采集静脉血样,采用ELISA法测定血浆心肌肌钙蛋白Ⅰ浓度.结果 与C组比较,D组术毕时每搏指数和左室每搏功指数升高,血管吻合完毕后30 min和术毕时周围血管阻力降低,术后24 h时血浆cTnI浓度降低(P＜0.05);其余血液动力学指标组间差异无统计学意义(P＞0.05).结论 术中静脉输注右美托咪啶0.5 μg·kg-1·h-1可减轻非体外循环冠状动脉旁路移植术患者心肌损伤.

Abstract：

Objective To evaluate the cardioprotective effect of dexmedetomidine in patients undergoing off-pump coronary artery bypass grafting. Methods Forty-six ASA Ⅱ or Ⅲ patients aged 37-64 yr weighing 54-81 kg undergoing off-pump coronary artery bypass grafting were randomized into 2 groups ( n = 23 each): control group (group C) and dexmedetomidine group (group D) . Dexmedetomidine was infused at 0.5 μg·kg-1·h-1 starting after induction of anesthesia until the end of operation in group D. Radial artery was cannulated and Swan-Ganz catheter placed via right internal jugular vein. HR, MAP, mean pulmonary arterial pressure, pulmonary capilary wedge pressure, central venous pressure, and cardiac output were recorded and stroke volume index, left and right ventricular stroke work index, systemic vascular resistance and pulmonary vascular resistance were calculated at the beginning of operation (T1 ), immediately (T2 ) and at 30 min after reestablishment of coronary blood flow (T3 ) and the end of operation (T4 ) . Venous blood samples were taken before induction of anesthesia (T0 , baseline) , at T4 and 4 h (T5 ) and 24 h (T6 ) after operation for determination of plasma concentration of cardiac troponin I by ELISA. Results Stroke volume index and left ventricular stroke work index were significantly higher at T4 while systemic vascular resistance was lower at T34 in group D than in group C. Plasma cardiac troponin Ⅰ concentration was significantly lower at T6 in group D than in group C. Conclusion Dexmedetomidine infusion at 0.5 μg ·kg-1·h-1 during operation can protect myocardium in patients undergoing off-pump coronary artery bypass grafting.

Cardioprotective effect of dexmedetomidine in patients undergoing off-pump coronary artery bypass grafting

Objective To evaluate the cardioprotective effect of dexmedetomidine in patients undergoing off-pump coronary artery bypass grafting. Methods Forty-six ASA Ⅱ or Ⅲ patients aged 37-64 yr weighing 54-81 kg undergoing off-pump coronary artery bypass grafting were randomized into 2 groups ( n = 23 each): control group (group C) and dexmedetomidine group (group D) . Dexmedetomidine was infused at 0.5 μg·kg-1·h-1 starting after induction of anesthesia until the end of operation in group D. Radial artery was cannulated and Swan-Ganz catheter placed via right internal jugular vein. HR, MAP, mean pulmonary arterial pressure, pulmonary capilary wedge pressure, central venous pressure, and cardiac output were recorded and stroke volume index, left and right ventricular stroke work index, systemic vascular resistance and pulmonary vascular resistance were calculated at the beginning of operation (T1 ), immediately (T2 ) and at 30 min after reestablishment of coronary blood flow (T3 ) and the end of operation (T4 ) . Venous blood samples were taken before induction of anesthesia (T0 , baseline) , at T4 and 4 h (T5 ) and 24 h (T6 ) after operation for determination of plasma concentration of cardiac troponin I by ELISA. Results Stroke volume index and left ventricular stroke work index were significantly higher at T4 while systemic vascular resistance was lower at T34 in group D than in group C. Plasma cardiac troponin Ⅰ concentration was significantly lower at T6 in group D than in group C. Conclusion Dexmedetomidine infusion at 0.5 μg ·kg-1·h-1 during operation can protect myocardium in patients undergoing off-pump coronary artery bypass grafting.