Objective: To study changes and rules of the left ventricular functions in rabbits with myocardial contusion through parallel functional analysis by using echocardiography combined with cardiac catheter intervention. ...Objective: To study changes and rules of the left ventricular functions in rabbits with myocardial contusion through parallel functional analysis by using echocardiography combined with cardiac catheter intervention. Methods: Thirty healthy rabbits were selected and impacted to make moderate or severe myocardial contusion by BIM II biomedical impact machine. The changes of hemodynamics and cardiac systolic and diastolic functions were respectively observed before injury and 1, 4, 8 and 24 hours after injury. Results: After myocardial contusion, the heart rate, systolic pressure, diastolic pressure and mean arterial pressure of rabbits decreased remarkably at 1 4 hours. The left ventricular end systolic pressure (LVESP), the maximum increasing rate of the left intraventricular pressure (+dp/dtmax), isovolumic pressure (IP) and the maximum systolic velocity of the left ventricle (Vmax) also decreased markedly. And then these parameters recovered to the level of preinjury at 8 24 hours. The left ventricular end diastolic pressure (LVEDP), the rate of the left intraventricular pressure (-dp/dtmax) and the decreasing time constant of the left intraventricular pressure (T) increased remarkably 1 hour after myocardial contusion, and did not decrease until 8 hours after myocardial contusion. Detection by echocardiography showed that ejection fraction of the left ventricle markedly decreased at 24 hours after myocardial contusion, while the systolic volume decreased obviously as early as 1 hour after myocardial contusion, at 4 8 hours it recovered a little and again decreased at 24 hours. The end systolic volume and end diastolic volume increased after myocardial contusion, but statistical significance was only seen at 8 hours after myocardial contusion.Conclusions: Cardiac functions of the left and right ventricles are markedly injured after myocardial contusion with disorders of the left ventricle diastolic function and of the right ventricle systolic function as the dominant injury. While the systolic function of the l展开更多
目的:观察重组人生长激素(Recombinant human growth hormone,rhGH)治疗胸部创伤所致心肌挫伤的疗效。方法:将55例胸部创伤所致心肌挫伤患者随机分为对照组27例和治疗组28例。对照组采用常规吸氧、严密监护常等治疗手段,治疗组在此基础...目的:观察重组人生长激素(Recombinant human growth hormone,rhGH)治疗胸部创伤所致心肌挫伤的疗效。方法:将55例胸部创伤所致心肌挫伤患者随机分为对照组27例和治疗组28例。对照组采用常规吸氧、严密监护常等治疗手段,治疗组在此基础上连续皮下注射rhGH 15 d后观察疗效。结果:经过rhGH的治疗,治疗组磷酸肌酸同工酶(CK-MB)、肌钙蛋白I(cTnI)、肌钙蛋白T(cTnT)改善情况明显好于对照组(P<0.05),心律失常率10.7%和心肌缺血率14.3%情况明显好于对照组的33.3%和37.0%(P<0.05)。结论:重组人生长激素对胸部创伤所致心肌挫伤具有治疗作用,可以进一步推广。展开更多
文摘Objective: To study changes and rules of the left ventricular functions in rabbits with myocardial contusion through parallel functional analysis by using echocardiography combined with cardiac catheter intervention. Methods: Thirty healthy rabbits were selected and impacted to make moderate or severe myocardial contusion by BIM II biomedical impact machine. The changes of hemodynamics and cardiac systolic and diastolic functions were respectively observed before injury and 1, 4, 8 and 24 hours after injury. Results: After myocardial contusion, the heart rate, systolic pressure, diastolic pressure and mean arterial pressure of rabbits decreased remarkably at 1 4 hours. The left ventricular end systolic pressure (LVESP), the maximum increasing rate of the left intraventricular pressure (+dp/dtmax), isovolumic pressure (IP) and the maximum systolic velocity of the left ventricle (Vmax) also decreased markedly. And then these parameters recovered to the level of preinjury at 8 24 hours. The left ventricular end diastolic pressure (LVEDP), the rate of the left intraventricular pressure (-dp/dtmax) and the decreasing time constant of the left intraventricular pressure (T) increased remarkably 1 hour after myocardial contusion, and did not decrease until 8 hours after myocardial contusion. Detection by echocardiography showed that ejection fraction of the left ventricle markedly decreased at 24 hours after myocardial contusion, while the systolic volume decreased obviously as early as 1 hour after myocardial contusion, at 4 8 hours it recovered a little and again decreased at 24 hours. The end systolic volume and end diastolic volume increased after myocardial contusion, but statistical significance was only seen at 8 hours after myocardial contusion.Conclusions: Cardiac functions of the left and right ventricles are markedly injured after myocardial contusion with disorders of the left ventricle diastolic function and of the right ventricle systolic function as the dominant injury. While the systolic function of the l
