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Esophageal thermal injury is one of the most devastating complications of atrial radiofrequency ablation, and its diagnosis can be challenging. In this report, we highlight the novel use of free water as a contrast material to better visualize the esophageal lumen in a patient with anaphylaxis to Iodinated contrast media and Gadolinium who recently underwent atrial fibrillation ablation. This becomes particularly handy in patients with contrast allergy, and further emphasizes the role of multimodality imaging. [Display omitted] • MR hydrography is a novel technique that can be used for evaluation of esophageal perforation after RF ablation procedures. • This technique is useful in a subset of patients with contrast allergy in whom multimodality imaging evaluation is necessary. • This report forms the basis of a new imaging technique that could potentially be used in clinical practice in the future. [ABSTRACT FROM AUTHOR]

This document summarizes the relevant literature for the selection of preprocedural imaging in three clinical scenarios in patients needing endovascular treatment or cardioversion of atrial fibrillation. These clinical scenarios include preprocedural imaging prior to radiofrequency ablation; prior to left atrial appendage occlusion; and prior to cardioversion. The appropriateness of imaging modalities as they apply to each clinical scenario is rated as usually appropriate, may be appropriate, and usually not appropriate to assist the selection of the most appropriate imaging modality in the corresponding clinical scenarios. The American College of Radiology Appropriateness Criteria are evidence-based guidelines for specific clinical conditions that are reviewed annually by a multidisciplinary expert panel. The guideline development and revision process support the systematic analysis of the medical literature from peer reviewed journals. Established methodology principles such as Grading of Recommendations Assessment, Development, and Evaluation or GRADE are adapted to evaluate the evidence. The RAND/UCLA Appropriateness Method User Manual provides the methodology to determine the appropriateness of imaging and treatment procedures for specific clinical scenarios. In those instances where peer reviewed literature is lacking or equivocal, experts may be the primary evidentiary source available to formulate a recommendation. [ABSTRACT FROM AUTHOR]

This study investigates the effect of a new methodology of the mathematical infinity on students’ beliefs of it. A group of 25 students (grade 12) participated in the study considering traditional views on infinity in mathematics and then recently introduced to “Arithmetic of Infinity” methodology proposed by Yaroslav D. Sergeyev. The students were subject to an intervention presenting this methodology which is new to them and different from the classical one. A pre- & post questionnaires were administrated to check its effect. Results showed that the majority of students had positive beliefs of infinity after being exposed to this methodology. [ABSTRACT FROM AUTHOR]