Pericardial effusions typically lead to low QRS voltages or electrical alternans, and can be seen on an echocardiograph.
心包积液常显示QRS低电压或电交替现象；超声心动图也可做出诊断。
Electrical alternans
原声例句
Osmosis-心血管
英语百科
Electrical alternans
Electrical alternans is an electrocardiographic phenomenon of alternation of QRS complex amplitude or axis between beats and a possible wandering base-line. It is seen in cardiac tamponade and severe pericardial effusion and is thought to be related to changes in the ventricular electrical axis due to fluid in the pericardium, as the heart essentially wobbles in the fluid filled pericardial sac.
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