الفهرس 
The Normal Conduction SystemOnly 14 pages are availabe for public view
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Abstract
Right ventricular pacing for the treatment of various conduction disorders, is associated with deleterious effects on left ventricular function leading to reduction in the left ventricular ejection fraction and pacing induced cardiomyopathy over time The aim of this work was to study the effects of right ventricular pacing on left ventricular function using 2D speckle tracking echocardiography The study was carried out on 50 patients with conduction disturbance who were candidates for single chamber pacemaker implantation All patients underwent single chamber pacemaker implantation and followed up for a period of 1 year after. 2D speckle tracking echocardiography was done at baseline for all patients before implantation and at 1- and 12 months periods. Follow up of ejection fraction and global longitudinal strain to detect the effects of RV pacing on LV function. The patients were then divided into three groups according to the decline in ejection fraction (non-significant decline, pacemaker induced ventricular dysfunction and pacemaker induced cardiomyopathy.