Dear Dr. Roach: After reading several of your columns, where readers asked if they are too old for some activity, I wanted to make older adults aware of their untapped reservoir of energy and ability.

Left ventricular hypertrophy (LVH) is when the heart’s main pumping chamber, the left ventricle, becomes thicker and less able to pump blood efficiently. It usually develops because of another heart ...

The ventricles share a common septum and, therefore, the filling of one influences the compliance of the other. This phenomenon is known as direct diastolic ventricular interaction. The interaction is ...