@misc{cogprints4184, volume = {4}, number = {4}, month = {October}, author = {Michael D Farmer and Mark NA III Estes and Mark S Link}, editor = {Balbir Singh and Yash Lokhandwala and Johnson Francis and Anup Gupta}, title = {New Concepts in Pacemaker Syndrome }, publisher = {Indian Pacing and Electrophysiology Group}, year = {2004}, journal = {Indian Pacing and Electrophysiology Journal}, pages = {195--200}, keywords = {VVI = ventricular-based, VVIR = rate modulated ventricular-based, A-V = atrioventricular, V-V = interventricular, V-A = ventricular-atrial, LBBB = left bundle branch block, LVEF = left ventricular ejection fraction, DDDR = rate modulated dual-chamber, SND = sinus node dysfunction, AAI = single-chamber atrial, AF = atrial fibrillation, LV = left ventricular, RV= right ventricular }, url = {http://cogprints.org/4184/}, abstract = {After implantation of a permanent pacemaker, patients may experience severe symptoms of dyspnea, palpitations, malaise, and syncope resulting from pacemaker syndrome. Although pacemaker syndrome is most often ascribed to the loss of atrioventricular (A-V) synchrony, more recent data may also implicate left ventricular dysynchrony caused by right ventricular pacing. Previous studies have not shown reductions in mortality or stroke with rate-modulated dual-chamber (DDDR) pacing as compared to ventricular-based (VVI) pacing. The benefits in A-V sequential pacing with the DDDR mode are likely mitigated by the interventricular (V-V) dysynchrony imposed by the high percentage of ventricular pacing commonly seen in the DDDR mode. Programming DDDR pacemakers to encourage intrinsic A-V conduction and reduce right ventricular pacing will likely decrease heart failure and pacemaker syndrome. Studies are currently ongoing to address these questions. } }