In order to provide income over the lifetime of the retiree, the TDF is designed to increasingly invest in deferred annuities as the TDF reaches its target retirement date and investors in the TDF get older.
Freebase(0.00 / 0 votes)Rate this definition: Echocardiography. Echocardiogram, often referred to cardiac echo or simply an echo is a sonogram of the heart. Echocardiography uses standard two-dimensional, three-dimensional, and Doppler ultrasound to create images of the heart.
An echocardiogram is a test that uses sound waves to produce live images of your heart, allowing your doctor to monitor how your heart and its valves are functioning.n echocardiogram, also referred to as âecho,â can help spot blood clots in the heart, fluid in the sac around the heart, and problems with the aorta (the main artery connected to the heart). It is a key test in determining the health of heart muscle, namely after a heart attack.