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Statements

Subject Item
n2:A_ratio
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E/A ratio E/A比值
rdfs:comment
E/A比值（英語：E/A ratio）是超声心动图中，心室功能的标志， 是心尖四腔截面中心房到心室血流图中的早期舒张峰（E峰）和心房收缩峰 （A峰）的比值，可通过多普勒超声测量计算，能反映早期的心脏功能受损。 The E/A ratio is a marker of the function of the left ventricle of the heart. It represents the ratio of peak velocity blood flow from left ventricular relaxation in early diastole (the E wave) to peak velocity flow in late diastole caused by atrial contraction (the A wave). It is calculated using Doppler echocardiography, an ultrasound-based cardiac imaging modality. Abnormalities in the E/A ratio suggest that the left ventricle, which pumps blood into the systemic circulation, cannot fill with blood properly in the period between contractions. This phenomenon is referred to as diastolic dysfunction and can eventually lead to the symptoms of heart failure.
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dbc:Cardiovascular_physiology
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1102095408
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dbr:Doppler_echocardiography dbr:Diastolic_heart_failure dbr:Systemic_circulation dbr:Atrial_fibrillation dbc:Cardiovascular_physiology dbr:Diastole dbr:Left_ventricle dbr:Heart_failure dbr:Isovolumic_relaxation_time
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dbo:abstract
The E/A ratio is a marker of the function of the left ventricle of the heart. It represents the ratio of peak velocity blood flow from left ventricular relaxation in early diastole (the E wave) to peak velocity flow in late diastole caused by atrial contraction (the A wave). It is calculated using Doppler echocardiography, an ultrasound-based cardiac imaging modality. Abnormalities in the E/A ratio suggest that the left ventricle, which pumps blood into the systemic circulation, cannot fill with blood properly in the period between contractions. This phenomenon is referred to as diastolic dysfunction and can eventually lead to the symptoms of heart failure. E/A比值（英語：E/A ratio）是超声心动图中，心室功能的标志， 是心尖四腔截面中心房到心室血流图中的早期舒张峰（E峰）和心房收缩峰 （A峰）的比值，可通过多普勒超声测量计算，能反映早期的心脏功能受损。
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