作者通过测定收缩间隔时间(STI)的方法,对接触铅和汞的工人心肌收缩力作了研究,发现接触铅的工人由于舒张期缩短导致心搏周期缩短;射血前期(PEP)延长,而左心室射血时间仍未变化,射血前期/左心室射血时间(LVET)比值大于正常。接触汞的人群组中,STI的变化主要为射血前期时间的延长,而左心射血持续时间缩短。经心率 The authors studied myocardial contractility in workers exposed to lead and mercury by measuring the time to systolic interval (STI) and found that workers exposed to lead shortened the cardiac cycle due to shortened diastole; prolonged ejection (PEP) and left Ventricular ejection time remained unchanged, pre-ejection / left ventricular ejection time (LVET) ratio was greater than normal. In the population exposed to mercury, the change in STI was primarily an increase in pre-ejection duration, while the duration of left-echocardiographic ejection was shortened. The heart rate