ABNORMAL LEFT VENTRICULAR SYSTOLIC AND DIASTOLIC FUNCTIONAL RESPONSE TO ISOMETRIC EXERCISE IN IDIOPATHIC DILATED CARDIOMY-OPATHY: BENEFICIAL EFFECT OF CAPTOPRIL

In 19 patients with idiopathic dilated cardiomyopathy and symptoms of congetive heart failure, left ventricular (LV) systolic performance and diastolic velocity profiles were assessed by two- dimensional echocardiography and pulsed wave Doppler at rest and during handgrip exercise before and ninety minutes after administration of captopril (mean dose 25 +12mg; range 12. 5─50mg). Although heart rate and blood pressure increased similarly during handgrip exercise before and after captopril treatment, both were lower with handgrip exercise during captopril treatment. The results from this study indicated that acute angiotensin converting enzyme inhibition with captopril reduces preload and afterload and ameliorates handgrip exercise-induced LV systolic and diastolic filling dysfunction in patients with congestive heart failure secondary to idiopathic dilated cardiomyopathy.

T-2毒素急性中毒对大鼠左室心肌舒缩性能的影响

用颈动脉-左心室导管法,观察了乌拉坦麻醉大鼠致死量 T-2毒素静脉注射急性中毒后8h 内左心室舒缩性能及心率、心电图等指标的动态变化。其中,反映舒张性能的-dp/dt max、LVEDP、LVDP 降值及心电图缺血损伤性改变发生较早,一般在中毒后1～4h 开始,呈进行性加重,至4、5h,与对照组有显著或非常显著的差别国;心率和反映收缩性能的指标 LVSP、dp/dt max、V_(max)、V_(pm)、R-(dp/dt max 相继于中毒后4～6h 开始下降或延长,至6、7h 达到统计上的显著性。结果表明,T-2毒素急性中毒首先损害左室舒张性能,引起缺血损伤性变化,后期累及心肌收缩性,产生负性缩率和负性肌力效应。