What device assists in pumping oxygen-rich blood from the left ventricle?

The left ventricular assist device (LVAD) is specifically designed to assist the heart in pumping oxygen-rich blood from the left ventricle into the aorta and to the rest of the body. It is particularly beneficial for patients who have severe heart failure or are awaiting a heart transplant. By mechanically supporting the function of the left ventricle, an LVAD can help maintain proper circulation, improve organ function, and alleviate symptoms associated with heart failure.

Other devices listed, such as pacemakers and aortic balloon pumps, serve different functions. A pacemaker regulates the heart's electrical activity to ensure a consistent rhythm rather than assisting with blood pumping. A heart-lung machine provides temporary cardiac and respiratory support during certain surgical procedures but does not assist with blood pumping from the left ventricle in a chronic setting. Thus, the LVAD uniquely fulfills the role of supporting blood flow from the left ventricle effectively.