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| jugular venous pressure ： ウィキペディア英語版 |
jugular venous pressure
The jugular venous pressure (JVP, sometimes referred to as ''jugular venous pulse'') is the indirectly observed pressure over the venous system via visualization of the internal jugular vein. It can be useful in the differentiation of different forms of heart and lung disease.
Classically three upward deflections and two downward deflections have been described.
* The upward deflections are the "a" (atrial contraction), "c" (ventricular contraction and resulting bulging of tricuspid into the right atrium during isovolumetric systole) and "v" = atrial venous filling.
* The downward deflections of the wave are the "x" (the atrium relaxes and the tricuspid valve moves downward) and the "y" descent (filling of ventricle after tricuspid opening).
==Method==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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