The accumulation of blood in the lungs caused by left-sided heart failure makes the right ventricle work harder. This can stress the right side of the heart and cause it to fail. Right-sided heart failure can also occur as a result of other conditions, such as lung disease.left ventricle doesn’t pump efficiently. This prevents your body from getting enough oxygen-rich blood. The blood backs up into your lungs instead, which causes shortness of breath and a buildup of fluid
