E/A比值(英語:E/A ratio)是超聲心動圖中,心室舒張功能的標誌, 是心尖四腔截面中心房到心室血流圖中的早期舒張峰(E峰)和心房收縮峰 (A峰)的比值[2],可通過多普勒超聲測量計算,能反映早期的心臟功能受損[3]。
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