II. Definition

  1. Form of Supraventricular Tachycardia (10% of cases) with increased automaticity

III. Pathophysiology

  1. Abnormal focus of atrial automaticity (outside the SA node)
  2. Unlike AVNRT and AVRT, no accessory pathway is involved

IV. Findings: General

  1. Heart Rate 130 to 180 (up to 250)

V. Types

  1. Atrial Tachycardia
    1. Focal
    2. Macroentrant
  2. Multifocal Atrial Tachycardia
    1. Irregular narrow complex rhythm with 3 or more different P Wave morphologies

VI. Causes: Multifocal Atrial Tachycardia

  1. Causes: Enlarged atrium
    1. Chronic lung disease
    2. Congestive Heart Failure
  2. Causes: Other
    1. Acid-base disturbance
    2. Electrolyte abnormalities
      1. Hypokalemia
      2. Hypomagnesemia

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Ontology: Multifocal atrial tachycardia (C0221158)

Definition (NCI) An electrocardiographic finding of a supraventricular arrhythmia characterized by 3 or more distinct P wave morphologies with an isoelectric baseline, variable PR intervals and no predominant atrial rhythm. The ventricular rate is typically 100-150 beats per minute. (CDISC)
Definition (NCI_CDISC) An electrocardiographic finding of a supraventricular arrhythmia characterized by 3 or more distinct P wave morphologies with an isoelectric baseline, variable PR intervals and no predominant atrial rhythm. The ventricular rate is typically 100-150 beats per minute.
Concepts Disease or Syndrome (T047)
SnomedCT 49982000
Dutch multifocale atriumtachycardie
French Tachycardie auriculaire multifocale
German multifokale Vorhoftachykardie
Italian Tachicardia atriale multifocale
Portuguese Taquicardia auricular multifocal
Spanish Taquicardia auricular multifocal, taquicardia auricular multifocal (trastorno), taquicardia auricular multifocal
Japanese 多源性心房頻脈, タゲンセイシンボウヒンミャク
English multifocal atrial tachycardia, multifocal atrial tachycardia (diagnosis), Multifocal Atrial Tachycardia, MULTIFOCAL ATRIAL TACHYCARDIA, Multifocal Atrial Tachycardia by ECG Finding, Multifocal Atrial Tachycardia by EKG Finding, Multifocal atrial tachycardia, Multifocal atrial tachycardia (disorder)
Czech Multifokální síňová tachykardie
Hungarian Multifocalis pitvari tachycardia

Ontology: Atrial tachycardia (C0546959)

Definition (NCI) A disorder characterized by an electrocardiographic finding of an organized, regular atrial rhythm with atrial rate between 101 and 240 beats per minute. The P wave morphology must be distinct from the sinus P wave morphology. (CDISC)
Concepts Pathologic Function (T046)
SnomedCT 276796006, 23899004
English TACHYCARDIA ATRIAL, Atrial tachycardia, Tachycardia atrial, atrial tachycardias, tachycardia atrial, atrial tachycardia (diagnosis), atrial tachycardia, ATRIAL TACHYCARDIA, Atrial tachycardia (disorder), atrium; tachycardia, auricular; tachycardia, tachycardia; atrial, tachycardia; auricular, Atrial tachycardia, NOS, Atrial Tachycardia
Italian Tachicardia atriale
French Tachycardie auriculaire, TACHYCARDIE AURICULAIRE, Tachysystolie auriculaire
German Tachykardie Vorhof, TACHYKARDIE VORHOF, Vorhoftachykardie
Japanese 心房頻脈, シンボウヒンミャク
Portuguese TAQUICARDIA AURICULAR, Taquicardia auricular
Spanish TAQUICARDIA AURICULAR, taquicardia auricular (trastorno), taquicardia auricular, Taquicardia auricular
Czech Síňová tachykardie, Tachykardie síňová
Hungarian Pitvari tachycardia
Dutch atrium; tachycardie, auriculair; tachycardie, tachycardie; atrium, tachycardie; auriculair, atriumtachycardie