<qa>  What is the name of the MCSD therapy used for?Over the last several decades, MCSDs have been developed to augment or supplant failing myocardial performance. This therapy has been used successfully as a bridge to heart transplantation, a bridge to recovery, and as permanent implantation or destination therapy for intractable heart failure. Although heart transplantation offers life-saving therapy for selected patients, its use is limited by a supply of donor organs that currently meets less than one-tenth the need. As a consequence, the number of MCSD implantations has increased in recent years. 