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This study evaluated patient, physician, and practice factors associated with this increase in CRT utilization. Patients with reduced left ventricular ejection fraction and chronic HF who met the eligibility criteria for CRT at baseline and 24 months were analyzed. Multivariate analyses using patient, physician, and practice characteristics were performed to evaluate factors associated with increased CRT utilization at 24 months. There were 440 patients eligible for CRT both at baseline and 24 months, with 217 (49.3%) treated at baseline and 374 (85%) treated at 24 months, leading to an absolute increase in use of CRT of 35.7%, P http://www.selleckchem.com/products/ch5424802.html physician, or practice characteristics had any significant association with the extent of increase in CRT utilization. There was a significant reduction in the variation of CRT utilization across practice sites after the implementation of the performance improvement initiative. The performance improvement initiative in IMPROVE HF was the most important factor associated with an increase in guideline-recommended http://www.selleck.cn/products/Everolimus(RAD001).html CRT utilization. This improvement in CRT utilization and reduced practice variability was found across a variety of cardiology and multispecialty practice sites. ""Background: Concealed sick sinus syndrome may become manifest after restoration of sinus rhythm by ablation in patients with long-standing persistent atrial fibrillation (AF). The purpose of this study was to investigate the association between the preprocedural http://www.selleckchem.com/products/azd9291.html ventricular rate during AF and sinus node function in patients with long-standing persistent AF. Methods: Consecutive patients (n = 102) who underwent ablation for long-standing persistent AF were enrolled. We measured the ventricular rate during AF before ablation in the absence of antiarrhythmic drugs. Sinus node function was assessed by electrophysiological study and serial Holter recordings after ablation. Results: Patients in the lowest quartile of ventricular rate during AF had longer corrected sinus node recovery time (1.06 �� 1.39 seconds) than those in the other quartiles (0.54 �� 0.31 seconds; P = 0.006) and lower mean heart rate on 24-hour Holter recording 3 months after ablation (68 �� 9 beats/min vs 75 �� 10 beats/min, P = 0.01). During a mean follow-up of 23 �� 10 months, sick sinus syndrome necessitating permanent pacemaker implantation developed in five (5%) patients, and multivariate analysis revealed that a low ventricular rate during AF rate was an independent risk factor for sick sinus syndrome (odds ratio = 0.90 for a 1 beat/min increase in AF rate, P = 0.04).