Pacemaker synchronization.
A method using the standard radio-frequency receiver was developed to telemeter biopotentials across the intact body Wall; it can be employed to program a stimulus to the heart at any phase of the cardiac cycle. The small variations of potential across the electrodes of the implanted cardiac pacemaker change the natural resonant frequency of the receiver in direct relation to the electrical activity of the heart.
D000818:Animals; D002302:Cardiac Output; D004285:Dogs; D004558:Electric Stimulation; D004562:Electrocardiography; D010138:Pacemaker, Artificial; D011845:Radio