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过去,对心脏功能的研究,一般是定性的或描述性的。近年来已深入到定量研究的阶段。左心室收缩功能的测定是诊断疾病、估计预后和判断疗效的一个重要方面。在心脏病人,呼吸困难和疲倦是常见的症状,但是并不具有特异性。如果这些病人的心脏还没有明显的解剖改变(如心脏增大、瓣膜畸形等),也没有明显的心脏病体征时,常常难于鉴别这些症状
In the past, studies of cardiac function have generally been qualitative or descriptive. In recent years has been deep into the quantitative research stage. Determination of left ventricular systolic function is an important aspect of the diagnosis of disease, prognosis and determine the efficacy. Dyspnea and fatigue are common symptoms in heart patients, but are not specific. It is often difficult to identify these symptoms if there is no significant anatomical change in their heart (eg, heart enlargement, valvular malformation, etc.) and no obvious signs of heart disease