问:什么叫做前负荷和后负荷?前或后负荷加重所致心功能不全在临床表现方面有何不同? 答:前负荷亦称为容量负荷或舒张期负荷,是指心室舒张末期容量和室壁的张力,因此前负荷大小主要取决于静脉回心血量多少以及心室舒张末期容量和压力的高低。以左室为例,临床上导致左室前负荷过重的疾病,如二尖瓣和主动脉瓣关闭不全、室间隔缺 Q: What is pre-load and post-load? What is the difference in clinical manifestations of cardiac dysfunction caused by increased load before or after? A: The pre-load, also known as capacity load or diastolic load, refers to the end-diastolic capacity and ventricular wall Of the tension, so the size of the front load depends on how much venous return to the amount of ventricular end diastolic volume and pressure levels. To the left ventricle, for example, clinically lead to pre-left ventricular overload disease, such as mitral and aortic valve regurgitation, ventricular septal defect