As the left ventricle fails,

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As the left ventricle fails, blood builds up in the lungs because the left ventricle is unable to eject all the blood within its walls. Right ventricular failure is often a result of left ventricular failure. Blood backs up behind the right ventricle, increasing the pressure in the right atrium. If the right atrium is unable to eject the blood within its walls, blood backs up into the superior and inferior venae cavae. Veins become congested with blood because the superior and inferior venae cavae cannot drain into an already full right atrium. Because venous return is delayed, organs become congested with blood. As venous congestion worsens, increased pressure within the veins forces serous fluid through capillary walls and into body tissues, producing edema.

As the Left Ventricle Fails