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Pacemaker therapy has been recognized as effective for the control of sinus and atrio-ventricular (AV) node dysfunction. Single chamber pacing when compared with dual chamber pacing, has numerous advantages of low complication rates, lower cost, better longevity, with non-inferiority in the quality of life and hard outcomes proven in direct randomized comparisons. However, comparison between single and dual chamber pacers was never adequate, since not more then half of the patients in the trials were actually using pacemakers for the majority of the time. Routine dual chamber pacing using a right ventricle apical lead is also associated with significant increase in peri-operative and remote complications. Some of these complications may be related to ventricular desynchronization secondary to the pacing location, which is potentially avoidable by using biventricular pacing. A randomized trial which will compare single chamber rate responsive pacing to the best available modification of dual chamber pacing (biventricular pacing) in suitable patients is therefore warranted.
Allocation: Randomized, Control: Active Control, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double-Blind, Primary Purpose: Treatment
Hamilton Health Sciences - General Division
Published on BioPortfolio: 2014-08-27T03:50:25-0400
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Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).
A type of cardiac arrhythmia with premature atrial contractions or beats caused by signals originating from ectopic atrial sites. The ectopic signals may or may not conduct to the HEART VENTRICLES. Atrial premature complexes are characterized by premature P waves on ECG which are different in configuration from the P waves generated by the normal pacemaker complex in the SINOATRIAL NODE.
A cardiac arrhythmia that is caused by interaction of two independently initiated cardiac impulses of different rates from two separate foci. Generally one focus is the SINOATRIAL NODE, the normal pacemaker. The ectopic focus is usually in the HEART VENTRICLE but can be in the HEART ATRIUM or the ATRIOVENTRICULAR NODE. Modulation of the parasystolic rhythm by the sinus rhythm depends on the completeness of entrance block surrounding the parasystolic focus.
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