![]() Onset of atrial tachycardia ( atrial flutter, atrial fibrillation or atrial tachycardia) that is tracked by the pacemaker. Tracking an Atrial Tachyarrhythmia by Dual Chamber Pacemaker ![]() Placing a magnet on the device results in the termination of tachycardia by suspending the atrial sensing. The endless-loop tachycardia is observed on the electrocardiogram as a tachycardia with pacemaker pacing close to the maximum rate limited by the pacemaker programming. The ventricular stimulus is conducted by the normal condution system (retrograde conduction ) and it is sensed as native atrial activity with subsequent ventricular pacing this ventricular stimulus returns to the atria by the normal condution system, closing the circuit. It is a re-entrant tachycardia, which occurs in the dual-chamber pacemakers. ![]() The electrocardiogram shows a partial or total absence of pacemaker spikes despite the existence of conduction problems. Remember: The full or partial absence of spikes does not mean a problem of pacing, it can be inhibited by a patient's heart rhythm with a higher heart rate. The main causes are often the fracture or displacement of the lead, battery depletion, electrolyte disturbance or antiarrhythmic treatment (in these last two the function of the pacemaker is correct but is not able to stimulate the muscle). ![]() Pacing disorders occur when the electrical stimulation of the device does not occur or is not transmitted to the myocardium. The dysfunctions of pacemakers can be classified in disorders of the stimulation (generation or transmission of the stimulus), or the sensing (absence or bad detection of cardiac stimulation). In these cases the electrocardiogram is the first tool with which we have to detect them. The electrical pacemaker, as every device, can present alterations in its operation. ![]()
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