心力衰竭(以下简称心衰)是指心脏因心肌病损、长期负荷过重等原因,引起心功能减退,排出的血量不能满足机体组织代谢需要的一种病理状态。此时静脉回流受阻、脏器瘀血、动脉血液灌注不足,从而产生一系列的临床症状和体征,因而实际上系一综合征。由于脏器瘀血、缺氧,所以影响是周身性的。一、名词解释 (一)射血比数(Ejection fraction,射血分数、喷血分数、排血比数) Heart failure (hereinafter referred to as heart failure) refers to the heart due to myocardial damage, long-term overload and other causes of cardiac dysfunction, discharge of blood can not meet the needs of the body tissue metabolism of a pathological state. At this point venous obstruction blocked, organ stasis, inadequate arterial blood perfusion, resulting in a series of clinical symptoms and signs, which in fact is a syndrome. Due to organ stasis, hypoxia, so the impact is whole body. First, the terminology to explain (a) ejection ratio (ejection fraction, ejection fraction, ejection fraction, drainage ratio)