[Pacemaker activation by muscular movement]

In recent years impressive progress was achieved in the field of cardiac stimulation. Sometimes atrial systole is not available to increase stroke volume in patients with pacemakers for complete atrioventricular block. We describe a new model of heart pacemaker (Activitrax), which is activated by muscle movement and is responsive to metabolic demands, increasing the pacemaker's firing rate according to exercise. The result which allowed a better quality of life was highly satisfactory.