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问题:对于因需进行非急诊左心导管插入术而就诊的患者,利用计算机心音描记法测绘第三心音(S3)和第四心音(S4),其诊断左室功能不全的准确性如何? 方法实验设计:以B型利钠肽浓度(BNP)、左室舒张末压力 (LVEDP)、左室射血分数(LVEF)为参考标准与S3和S4进
Question: What are the diagnostic accuracy of third heart sounds (S3) and fourth heart sounds (S4) in patients undergoing non-emergency left heart catheterization for the diagnosis of left ventricular dysfunction by computerized phonocardiography? Methods Experimental design: B-type natriuretic peptide concentration (BNP), left ventricular end diastolic pressure (LVEDP), left ventricular ejection fraction (LVEF) as a reference standard and S3 and S4