Objective The underlying mechanisms responsible for both electrical and mechanical remodeling of the atrium after cardioversion of atrial tachyarrhythmias may be similar, but they are still incompletely understood, and whether the changes in atrial myocardium structure after short-term rapid atrial activation is the basis for this remodeling is unknown. We aimed to investigate atrial mechanical...

Threshold bipolar pacing was performed from one of 12 selected atrial sites with temporary implanted electrodes in 69 patients following open-heart surgery in order to study P wave polarity and morphology and the P-R interval during paced ectopic atrial rhythms. A negative P wave was recorded in lead I only with pacing the left atrium and only when pacing near the left pulmonary veins. A posit...

Lead dislocation is one of the most undesired complications of permanent pacemaker implantation. The rate of dislodgement of atrial pacing leads is nearly 3% [1]. Reopening the pacemaker pocket and repositioning the lead is the most commonly used technique for correcting dislocations which occur in the early period after implantation. However, this increases the risk of pocket infection and inc...

A 67-year-old male patient with ischemic dilated cardiomyopathy underwent implantation of an implantable cardioverter-defibrillator with cardiac resynchronization therapy about one month ago. The implantation process was successful and the patient was discharged in good condition. At the routine first month follow-up, pacemaker analysis revealed that there was no atrial pacing and sensing, alth...

OBJECTIVE To compare the acute effects of right atrial appendage, atrial septal, coronary sinus os, and dual site pacing on the duration of atrial activation. METHODS 20 patients with a variety of cardiac conditions underwent an intracardiac electrophysiological study. Electrograms were recorded from the right atrial appendage and at multiple sites within the coronary sinus. The duration of a...

To cite: Sheridan M, Kirubakaran S. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2014208869 DESCRIPTION A 76-year-old woman on warfarin for atrial fibrillation presented for routine pacing check 6 weeks after implantation of a dual-chamber device. She felt weak and generally unwell. The atrial lead was not sensing or pacing at high outputs. A chest X-ray showed...

Atrial Preference Pacing (APP) is a pacemaker (PM) algorithm that works by increasing the atrial pacing rate to achieve continuous suppression of a spontaneous atrial rhythm and prevent supraventricular tachyarrhythmias. We have previously shown that atrial preference pacing may significantly reduce the number and the duration of AF episodes in myotonic dystrophy type 1 (DM1) patients who are p...

Dual-chamber (DDD) pacing for maintenance of atrioventricular (AV) synchrony generally requires the implantation of two leads, one in the right atrium and one in the right ventricle. During the early 1990's, the efforts were made to achieve DDD pacing using only one lead [1-3]. The idea was to use the electrical field generated between the floating ring electrodes located in the right atrium to...

OBJECTIVES To evaluate the long-term functional and hemodynamic effects of right ventricular outflow tract (RVOT) pacing by comparison with right ventricular apical (RVA) pacing. BACKGROUND Acute studies have suggested that RVOT pacing could significantly improve cardiac performance in comparison with RVA pacing but no data are available in chronically implanted patients. METHODS Sixteen pa...