Ashman phenomenon

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Ashman phenomenon Classification and external resources
Ashman phenomenon
eMedicine	med/2962

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The Ashman phenomenon, also known as Ashman beats, describes a particular type of wide complex tachycardia (fast rhythm of the heart) that is often seen in atrial fibrillation. In particular, it is important because it can be misinterpreted as non-sustained ventricular tachycardia.

Ashman beats are described as wide complex QRS complexes that follow a short R-R interval preceded by a long R-R interval. This wide QRS complex represents an abberantly conducted complex that originates above the AV node, rather than a complex that originates in either the right or left ventricle.

EKG Examples

Ashman phenomenon

Reference

1. Ashman R, Byer E. Aberration in the conduction of premature ventricular impulses. J La State Med Soc 8:62, 1946

See also

• Atrial fibrillation
• Electrocardiogram

v • d • e Electrocardiography
Overview	History of the EKG • EKG interpretation basics • Normal sinus rhythm
EKG Complexes	P wave • QRS complex • ST Segment • T wave • U wave Osborn wave • H wave • K wave • Delta wave NSSTW changes
EKG Intervals	PR Interval • QRS Interval • ST Interval • QT Interval
Conduction System & Bradycardia	Cardiac pacemaker • SA node • AV node• Bundle of His • Purkinje fibers • Sinus bradycardia • First Degree AV Block • Second Degree AV Block • Complete or Third-Degree AV Block • Concealed conduction • AV Junctional Rhythms • LBBB • LAHB • LPHB • RBBB • Trifascicular block
Atrial Arrhythmias	Sinus tachycardia • Premature Atrial Contractions (PACs) • Ectopic Atrial Rhythm • Paroxysmal Atrial Tachycardia (PAT) • Paroxysmal Atrial Tachycardia (PAT) with Block • Multifocal Atrial Tachycardia (MAT) • Atrial Flutter • Atrial Fibrillation • Wandering atrial pacemaker
Ventricular Arrhythmias	Differential Diagnosis of Tachycardia with a Wide QRS Complex • Accelerated Idioventricular Rhythm • Ventricular Parasystole • Premature Ventricular Contractions (PVCs) • Ventricular tachycardia • Ventricular Fibrillation • Sudden cardiac death
EKG Abnormalities in Disease States	Hypertrophy & Dilatation • Right atrial enlargement • Left atrial enlargement • Biatrial enlargement • Left Ventricular Hypertrophy • Right Ventricular Hypertrophy • Biventricular Hypertrophy • Acute myocardial infarction • NSTEMI • STEMI • Right ventricular myocardial infarction • Atrial infarction Pre-excitation Syndromes • Wolff-Parkinson-White Syndrome • Lown Ganong Levine Syndrome • Mahaim Type Preexcitation Cardiomyopathies • Arrhythmogenic Right Ventricular Dysplasia • Dilated Cardiomyopathy • Hypertrophic Cardiomyopathy Drug Effects on the EKG • Adenosine • β-blockers • Digitalis • Quinidine • Procainamide • Disopyramide • Lidocaine • Tocainide and Mexiletine • Phenytoin • Encainide, Flecainide and Propafenone • Amiodarone • Bretylium • Ca Channel Blockers • Phenothiazines • Tricyclic Antidepressants • Lithium Congenital Heart Disease • Dextrocardia • Atrial Septal Defect • Ventricular Septal Defect • Tetralogy of Fallot • Conjoined Twins or Siamese Twins Electrolyte Disturbances • Hyperkalemia • Hypokalemia • Hypercalcemia • Hypocalcemia • Nonspecific Changes Other Heart Diseases • Pericarditis • Myocarditis • Tamponade • Heart Transplantation • Sick Sinus Syndrome • Long QT Syndrome Inherited Disease • Brugada Syndrome Systemic Diseases • CNS Disease • Cardiac Tumors Heart Transplantation • EKG Changes in patient with Heart Transplantation Exogenous Effects • Hypothermia • Chest Trauma • Insect Bites • Electric Injuries
Technical Issues and Potential Errors in Interpretation	Artifacts • Lead Placement Errors • The EKG in a Patient with a Pacemaker

v • d • e WikiDoc Research Resources for Ashman phenomenon
Articles on Ashman phenomenon	Most recent articles on Ashman phenomenon • Most cited articles on Ashman phenomenon • Review articles on Ashman phenomenon • Articles on Ashman phenomenon in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Ashman phenomenon	Powerpoint slides on Ashman phenomenon • Images of Ashman phenomenon • Photos of Ashman phenomenon • Podcasts & MP3s on Ashman phenomenon • Videos on Ashman phenomenon
Evidence Based Medicine Regarding Ashman phenomenon	Cochrane Collaboration on Ashman phenomenon • Bandolier on Ashman phenomenon • TRIP on Ashman phenomenon
Cost Effectiveness of Ashman phenomenon	Cost Effectiveness of Ashman phenomenon
Clinical Trials Involving Ashman phenomenon	Ongoing Trials on Ashman phenomenon at Clinical Trials.gov • Trial results on Ashman phenomenon • Clinical Trials on Ashman phenomenon at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Ashman phenomenon	US National Guidelines Clearinghouse on Ashman phenomenon • NICE Guidance on Ashman phenomenon • NHS PRODIGY Guidance • FDA on Ashman phenomenon • CDC on Ashman phenomenon
Textbook Information on Ashman phenomenon	Books and Textbook Information on Ashman phenomenon
Pharmacology Resources on Ashman phenomenon	Dosing of Ashman phenomenon • Drug interactions with Ashman phenomenon • Side effects of Ashman phenomenon • Allergic reactions to Ashman phenomenon • Overdose information on Ashman phenomenon • Carcinogenicity information on Ashman phenomenon • Ashman phenomenon in pregnancy • Pharmacokinetics of Ashman phenomenon •
Genetics, Pharmacogenomics, and Proteinomics of Ashman phenomenon	Genetics of Ashman phenomenon • Pharmacogenomics of Ashman phenomenon • Proteomics of Ashman phenomenon
Newstories on Ashman phenomenon	Ashman phenomenon in the news • Be alerted to news on Ashman phenomenon • News trends on Ashman phenomenon
Commentary on Ashman phenomenon	Blogs on Ashman phenomenon
Patient Resources on Ashman phenomenon	Patient resources on Ashman phenomenon • Discussion groups on Ashman phenomenon • Patient Handouts on Ashman phenomenon • Directions to Hospitals Treating Ashman phenomenon • Risk calculators and risk factors for Ashman phenomenon
Healthcare Provider Resources on Ashman phenomenon	Symptoms of Ashman phenomenon • Causes & Risk Factors for Ashman phenomenon • Diagnostic studies for Ashman phenomenon • Treatment of Ashman phenomenon
Continuing Medical Education (CME) Programs on Ashman phenomenon	CME Programs on Ashman phenomenon
International Resources on Ashman phenomenon	Ashman phenomenon en Espanol • Ashman phenomenon en Francais
Business Resources on Ashman phenomenon	Ashman phenomenon in the Marketplace • Patents on Ashman phenomenon
Informatics Resources on Ashman phenomenon	List of terms related to Ashman phenomenon

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .