Instrumentation for the follow-up of pacemade patients. Telephone transmission of the electrocardiogram and self-check by the patient on pacemaker function and capture.

Logic circuitry has been added to an electrocardiogram telephone transmitter. It processes the electrocardiogram and permits frequent self-checks by the patient on rate, capture and sensing function of an implanted demand pulse generator system. Correct function is communicated to the patient by a green light. Malfunction with regard to any of these parameters produces an irreversible yellow light signaling the patient to contact his physician. The self-check is reassuring to the patient during intervals between visits to the physician's office or a specialized clinic. The system, at present, is applicable only to demand pulse generators with a high magnet test rate (90 ppm or higher) which assures capture in virtually all patients. This and other limitations are discussed. Their incidence is low, some can be remedied and in the majority of patients they do not impair the clinical usefulness of the system.