Outline
Apparatus for recovering and stabilizing normal heart rate of patients suffering from or being inclined to having atrial fibrillation, the apparatus configured to execute the step of sensing primary electrical pulses generated in the right atrium (1), of generating artificial electrical stimulation pulses coordinated with the sensed pulses and stimulating therewith the portion of the left atrium (9) which is remote from the right atrium (1), thereby increasing the areas of the heart muscle that can be reached during a stimulation pulse within a predetermined period of time.