长久以来一直认为,心源性劳力性呼吸困难是左心衰竭的早期表现,但其发生机制却不十分清楚。本文试图探讨其发生机制及与临床心功能检查的相关关系。材料和方法一、病例选择:本研究包括70例心脏病人及30例正常人,所有病员均除外胸肺疾患。根据呼吸困难的程度及肺底湿性罗音的有无分为四组。呼吸困难分级如下:Ⅰ级:在平地上走路或爬小山坡时感到气短;Ⅱ级:在平地上和同龄人一起步行时感到气短;Ⅲ级:在平地上用平常步伐走路时需要 It has long been believed that cardiogenic dyspnea is an early manifestation of left heart failure, but its mechanism is not well understood. This article attempts to explore its mechanism of occurrence and clinical cardiac function test. Materials and methods A case selection: This study includes 70 cases of heart disease and 30 cases of normal, except for all patients with chest and lung disease. According to the degree of difficulty breathing and lung wet rales were divided into four groups. Breathing difficulties are graded as follows: Grade I: Shortness of breath when walking or climbing a hillside on level ground; Level II: feeling shortness of breath while walking with peers on level ground; Grade III: required when walking on level ground with normal pace