An electromagnetic biventricular assist device adapted to assist ventricular output in a human heart includes a magnetic mat adapted for mounting inside a human body adjacent the heart, and an electromagnetic assembly adapted for mounting on the human body in functionally cooperative relation with respect to the mat. The mat is responsive to application of a first electromagnetic field generated by the electromagnetic assembly so as to be movable from a neutral position towards the heart and into compressive relation with the heart, and responsive to application of a second electromagnetic field that is opposite the first electromagnetic field so as to be movable from the neutral position in a direction away from the heart to expand ventricles in the heart and augment filling of the ventricles. A control circuit is constructed and arranged to control when the first and second electromagnetic fields are generated by the electromagnetic assembly.
