By the end of cardiac operations, the surgeon normally attach a small pacemaker electrode to the myocardium. A cable is led from the electrode throuygh the chest to enable coupling to a pacemaker. The thead and electrode is removed when the patient is dis charged from the hospital. Cardisense is a pacemaker electrode with an accelerometer integrated in the elctrode. The accelerometer countinously transmits signals on how the heart contracts through a cable.