Heart Assist Device For most patients in heart failure, it is the main pumping chamber (called the left ventricle) that becomes too weak to pump blood to the rest of the body.
(it; is; the main pumping chamber (called the left ventricle) that becomes too weak to pump blood to the rest of the body) (the main pumping chamber (called the left ventricle; becomes; too weak to pump blood to the rest of the body)
it the main pumping chamber (called the left ventricle
is becomes
the main pumping chamber (called the left ventricle) that becomes too weak to pump blood to the rest of the body
too weak to pump blood to the rest of the body