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However, approximately 30% of patients receiving CRT are non-responders. In order to improve the efficacy of CRT, the selection of appropriate patients based on the preoperative evaluation of the extent of left ventricular dyssynchrony http://www.selleck.cn/products/Everolimus(RAD001).html is important. Several echocardiographic indices for the evaluation of dyssynchrony are proposed, but recent study shows their limitations. Objective: We sought to determine the feasibility of MDCT (Multidetector CT) to detect left ventricular mechanical dyssynchrony in heart failure patients. Methods: Eight patients with heart failure (mean left ventricular ejection fraction 22.8%) who were the candidates for CRT underwent electrocardiogram-gated contrast-enhanced 64-slice MDCT (Philips Brilliance 64, EBW Workstation) and axial multiphase reformats were constructed. With visual observation, patients are divided into two groups: group D (with apparent left ventricular dyssynchrony, 4 patients), and group N (without apparent dyssynchrony, 4 patients). The short-axis image of the left ventricle at the level of papillary muscle was divided into 6 segments. We determined the time from R wave to maximal wall motion for each 6 segments and defined the maximum difference in time-to-maximal http://www.selleckchem.com/products/azd9291.html wall motion of all 3 pairs of opposing segments as wall motion delay (WMD). Echocardiographic measurements including septal-to-posterior wall motion delay (SPWMD) were performed in all patients. Results: WMD was significantly greater in group D compared with group N (32.5 �� 9.6% RR vs. 10.0 �� 7.1% RR, P http://www.selleckchem.com/products/ch5424802.html CATHETER FOR PULMONARY VEIN ISOLATION Tang M; Gerds-Li J-H; Kriatselis C; Zhang S Department of Arrhythmia, Fuwai Cardiovascular Hospital, Chinese Academy of Medical Science, Beijing Background: A novel circular pulmonary vein ablation catheter (PVAC) has been introduced for pulmonary vein isolation (PVI). Accurate delineation of left atrium-pulmonary vein (LA-PV) anatomy is important for this technique. The aim of this study was to test the 3-dimensional rotational angiogram of left atrium (3D RTA) can facilitate PVI using PVAC technique. Methods: Twenty patients with paroxysmal atrial fibrillation (AF) were enrolled in this study. The 3D RTA was reconstructed and registered with live fluoroscopy in all the patients. AF ablation was performed with PVAC catheter in the navigation of registered 3D RTA.