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Transcript
AV sequential and atrial pacing are frequently employed during cardiac surgery as various degrees of heart block are often encountered perioperatively. Prolongation of the PR interval is seen in first-degree heart block here associated with the prolonged QRS complexes often seen during bundle branch blocks. In second-degree heart block the PR interval gradually lengthens until the impulse is no longer conducted to the ventricles. In third-degree block there is no association between atrial and ventricular beats. The atrial and the ventricular contraction are not coordinated. Source: Chapter 3. Perioperative Rhythm Abnormalities, Cardiac Anesthesia and Transesophageal Echocardiography Citation: Wasnick JD, Hillel Z, Kramer D, Littwin S, Nicoara A. Cardiac Anesthesia and Transesophageal Echocardiography; 2011 Available at: http://mhmedical.com/ Accessed: May 03, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved
