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Single-chamber vs dual-chamber pacing for high-grade atrioventricular block


single-chamber vs dual-chamber pacing for high-grade atrioventricular block

Although this mode of ventricular pacing was better, some patients did not respond well, experiencing continued syncopal or near-syncopal events, dizziness, and, sometimes, congestive heart failure.
Cardiac-resynchronization therapy with or without an implantable defibrillator in advanced chronic heart failure.
Since the initial descriptions and development of pacing techniques, technological advances have enhanced the sophistication of cardiac pacemakers to allow proper sequencing of atrial and ventricular contraction and physiologic rate modulation.
The complexes in these periods are ventricular premature complexes, and in the ST segment there are pacing spikes followed by ventricular depolarizations.In patients with sick suche frau landwirtschaft sinus syndrome, periods of sinus arrest, and a normally functioning AV node, synchronization between the atria and ventricles can easily be accomplished by using atrial leads (.The question has now arisen: if the RVA is frauen kennenlernen kostenlos ohne registrierung unsuitable for long-term ventricular pacing, what is the alternative?Regional myocardial blood flow in patients with sick sinus syndrome randomized to long-term single chamber atrial or dual chamber pacing-effect of pacing mode and rate.In this situation, the pacemaker delivers an atrial pacing impulse, causing atrial depolarization.The bottom ECG is from a patient with a ventricular demand pacing system in which the pacemaker only paces when needed; it is able to sense inherent beats and withhold pacing at those times.N Engl J Med 2004;350:2140-2150.Cardiac resynchronization using biventricular pacing is sometimes recommended as a treatment for congestive heart failure in people.Because the patient has a normal AV node, this atrial depolarization is then conducted through the normal conduction pathway to cause ventricular depolarization.Pacing Clin Electrophysiol 1996;19:1279-1286.Mapping propagation of mechanical activation in the paced heart with MRI tagging.Can J Cardiol 2002;18(3 301-307.Wyman B, Hunter W, Prinzen F,.The effect of cardiac resynchronization on morbidity and mortality in heart failure.Influence of pacing site on left ventricular contraction.The drive to improve pacing practices has pushed human and veterinary electrophysiologists to rethink what is meant by physiologic pacing.The idea of delivering a pacing impulse directly into the cardiac conduction system is attractive because of the possible hemodynamic benefits that could be obtained by a normal activation sequence.With renewed appreciation for the important role that the pacing site may play in patient outcome, focus is now shifting to identifying the optimal or ideal site for pacing and delivering leads to that location.A small venotomy is made over the jugular vein and a lead is placed in the right ventricular apical endocardium.Burkhoff D, Oikawa R, Sagawa.
Springfield, IL: Charles C Thomas; 1960:253.
The term pacemaker syndrome was coined to refer to a complex of clinical signs and symptoms related to the potential adverse hemodynamic and electrophysiologic consequences of ventricular pacing in human patients.


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