While atrial fibrillation represents the most common cause of irregular tachycardia, the differential diagnosis includes several other possibilities. Multifocal atrial tachycardia and any other supraventricular tachycardia SVT with variable atrioventricular AV conduction such as atrial tachycardia or atrial flutter with variable AV block can present as irregularly irregular rhythms. Sinus tachycardia with premature atrial contractions or premature ventricular contractions can also present as an irregular tachycardia. In this case the patient had conduction down 2 separate pathways within the AV node, demonstrating a pattern known as a double ventricular response. The mechanism of this arrhythmia is described in the following paragraphs. Arch Intern Med.
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The Irregular Tachycardia That Was Not Atrial Fibrillation—Discussion
Atrial Rhythms | Lessons and Quiz
In adults a tachycardia is any heart rate greater than beats per minute. Supraventricular tachycardias may be divided into two distinct groups depending on whether they arise from the atria or the atrioventricular junction. This article will consider those arising from the atria: sinus tachycardia, atrial fibrillation, atrial flutter, and atrial tachycardia. Tachycardias arising from re-entry circuits in the atrioventricular junction will be considered in the next article in the series.
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Welcome to our Tachycardia Reference Page. This page provides a summary definition followed by introductions to our practice drills, quizzes, lessons and interactive guides. Tachycardia is a rapid, above normal, heart rate when the subject is at rest. A resting heart rate that exceeds one hundred beats per minute can be classified as tachycardia.
This page provides an introduction to atrial rhythms and links to training materials on this website. Atrial rhythms originate in the atria rather than in the SA node. The P wave will be positive, but its shape can be different than a normal sinus rhythm because the electrical impulse follows a different path to the AV atrioventricular node. These EKG differences are covered on our atrial rhythms training module as well as in practice strips which are available via a link in the right column. Atrial rhythms are classified as:.