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Media Gallery

Accelerated Idioventricular Rhythm. AIVR and sinus rhythm: AIVR starts and terminates gradually, competing with sinus rhythm. A possible ventricular fusion beat (arrow) and isoarrhythmic AV dissociation (arrowheads: sinus P waves) are present. During AIVR, ectopic ventricular rate is just faster than sinus rate. AIVR has a wide QRS morphology different from the QRS morphology in sinus rhythm.
Accelerated Idioventricular Rhythm. AIVR in atrial fibrillation: AIVR starts and terminates gradually, competing with the ventricular capture beats (arrow) from atrial fibrillation. Ventricular fusion beat (arrowhead) is present. AIVR has a wide QRS morphology different from the QRS morphology of ventricular capture beats.
Accelerated Idioventricular Rhythm. Complete heart block with escaped junctional rhythm: The AV dissociation in complete heart block is not isoarrhythmic AV dissociation, because the atrial rate is much faster than the escaped junctional ventricular rate.

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Author

Nayereh G Pezeshkian, MD Assistant Professor of Medicine, Division of Cardiology and Electrophysiology, University of California, Davis, School of Medicine

Nayereh G Pezeshkian, MD is a member of the following medical societies: American College of Cardiology, American Society of Echocardiography, Heart Rhythm Society

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Ronald J Oudiz, MD, FACP, FACC, FCCP Professor of Medicine, University of California, Los Angeles, David Geffen School of Medicine; Director, Liu Center for Pulmonary Hypertension, Division of Cardiology, LA Biomedical Research Institute at Harbor-UCLA Medical Center

Ronald J Oudiz, MD, FACP, FACC, FCCP is a member of the following medical societies: American College of Cardiology, American College of Chest Physicians, American College of Physicians, American Heart Association, American Thoracic Society

Disclosure: Serve(d) as a speaker or a member of a speakers bureau for: Actelion, Bayer, Gilead, United Therapeutics<br/>Received research grant from: Actelion, Arena, Gilead, GSK, Liquidia, Reata, United Therapeutics<br/>Received income in an amount equal to or greater than $250 from: Actelion, Complexa, Gilead, Medtronic, Reata, United Therapeutics.

Chief Editor

Jeffrey N Rottman, MD Professor of Medicine, Department of Medicine, Division of Cardiovascular Medicine, University of Maryland School of Medicine; Cardiologist/Electrophysiologist, University of Maryland Medical System and VA Maryland Health Care System

Jeffrey N Rottman, MD is a member of the following medical societies: American Heart Association, Heart Rhythm Society

Disclosure: Nothing to disclose.

Acknowledgements

Robert E Fowles, MD Clinical Professor of Medicine, University of Utah College of Medicine; Consulting Staff, Intermountain Medical Center and LDS Hospital; Director and Consulting Staff, Department of Cardiology, Salt Lake Clinic

Robert E Fowles, MD is a member of the following medical societies: American College of Cardiology, American College of Physicians, and American Heart Association

Disclosure: Nothing to disclose.

Rakesh K Sharma, MD, FACC Adjunct Associate Professor of Medicine and Cardiology; University of Arkansas for Medical Sciences, Medical Center of South Arkansas

Disclosure: Nothing to disclose.

Vibhuti N Singh, MD, MPH, FACC, FSCAI Clinical Assistant Professor, Division of Cardiology, University of South Florida College of Medicine; Director, Cardiology Division and Cardiac Catheterization Lab, Chair, Department of Medicine, Bayfront Medical Center, Bayfront Cardiovascular Associates; President, Suncoast Cardiovascular Research

Vibhuti N Singh is a member of the following medical societies: American College of Cardiology, American College of Physicians, American Heart Association, American Medical Association, and Florida Medical Association

Disclosure: Nothing to disclose.

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