Radiograph in the right anterior oblique projection showing catheters positioned for a standard diagnostic electrophysiology procedure. Three nonsteerable.

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Radiograph in the right anterior oblique projection showing catheters positioned for a standard diagnostic electrophysiology procedure. Three nonsteerable diagnostic catheters are introduced from the inferior vena cava into the right heart. Two 4-French catheters with four electrodes are positioned in the region of the right atrial appendage (RA) and right ventricular apex (RV apex). A 5-French catheter with six electrodes is positioned across the tricuspid annulus to obtain a His bundle recording (His). A nonsteerable 6-French catheter is introduced via the right internal jugular vein into the coronary sinus (CS) to obtain left atrial and ventricular recordings. Finally, a deflatable 7-French ablation catheter is positioned in the region of the low right atrium. Source: Chapter 57. Interventional Therapy for Atrial and Ventricular Arrhythmias, Cardiac Surgery in the Adult, 4e Citation: Cohn LH. Cardiac Surgery in the Adult, 4e; 2012 Available at: https://accesssurgery.mhmedical.com/DownloadImage.aspx?image=/data/books/cohn4/cohn4_c057f001.png&sec=39688788&BookID=476&ChapterSecID=39679075&imagename= Accessed: October 16, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved