Increased pacing frequency

The pacemaker delivers a basic frequency of stimulation pulses based on the patient's needs. Generally, the optimal heart rate is 70 to 90 beats / min, and the pacing frequency is preferably greater than 10% of the patient's own heart rate. Pacemaker syndrome is a group of clinical syndromes caused by hemodynamic and electrophysiological abnormalities after pacemaker implantation. As long as the atrioventricular is separated, any pacing pattern can occur. It is more common in VVI (suppressed on-demand ventricle) pacing. Mainly manifested as neurological symptoms, low cardiac output and congestive heart failure. About 38% of patients with syncope have clinical symptoms.