A 43-year-old man with multiple previous left atrial ablation procedures for persistent atrial fibrillation, including pulmonary vein isolation and mitral and roof lines, presented for a repeat ablation of persistent atrial tachycardia (Figure 1A). He had no other medical history, and the procedure was performed on uninterrupted warfarin, as a routine practice at our institution. Echocardiograp...

BACKGROUND The proximity to vascular structures is a limiting factor during radiofrequency ablation. However, little or no attention has been given to the atrial arterial circulation during the development of atrial fibrillation (AF) catheter ablation techniques. METHODS AND RESULTS We examined the atrial arterial circulation in areas involved in AF ablation in 24 heart specimens by colored r...

In order to study the characteristics of fire smoke spread and temperature distribution a large indoor pedestrian street under different heat release rates exhaust modes, this paper focuses on analysis spread, visibility, variation curves in an atrium. This uses numerical simulation method conduct research. PyroSim software is used calculate project, which based full-scale experimental design s...

We report a case of chronic hypoxemia in a 62-year-old woman as a result of biatrial drainage of a right-sided superior vena cava. Radionuclide ventilation and perfusion imaging revealed significant increased radiotracer activity in the kidneys, bowel, and thyroid gland suggesting a right-to-left shunt which was confirmed by contrast enhanced CT of the chest. An anatomically correct right-sided...

The drainage of low-sloped roof systems involves multiple design professionals, and often each has a different opinion as to their design responsibility. Roofing issues have been identified as being a number one source of litigation, and rain-induced roof collapses continue to occur with alarming frequency. With the backdrop of several rain-induced roof collapses, this paper illustrates the com...

considering current population rate and ratio of non renewable energies in countries' annual energy diagram which lead to increase of pollutions reeked from and irreparable effects on living environment, there will be an energy and living environment crisis in close future. so there are two main approaches that should be considered in countries' future program: change of construction ...

Raghib syndrome is an extremely rare congenital heart defect characterized by persistent left superior vena cava (LSVC) draining into the left atrium and absence of the coronary sinus. Although few cases have been reported in the literature, there are a number of techniques to redirect the LSVC flow to the right atrium. These procedures include surgery to establish intracardiac flow using atria...

Photovoltaic (PV) panels get hot in the sun. This decreases the operating efficiency through various means. Several approaches have been proven effective at cooling panels. Green Roofs are thermally cool, outperforming even white roofs over their life. On a hot summer day, a green roof can be 30◦C cooler than a typical roof, potentially improving the efficiency of a photovoltaic (PV) panel by a...

abstract this paper by reviewing the main examples of small to medium-scale retractable roof structures covering building courtyards is to present an innovative rigid retractable roof system employing spatial frames for a courtyard of an existing building in tabriz islamic art university. the courtyard is currently used for temporary exhibitions and gatherings whenever permitted by environmenta...

Floating roofs are widely used to store petroleum products with high volatility. This is to prevent the product loss and to ensure safe environment around the storage tanks. However, small number of researches were accomplished. These researches aim at study the design of the floating roof and the associated risks that it faces during operation. In an effort to compensate the lack of knowledge ...