EKG

Premature Atrial Contraction

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Premature Atrial Contraction, PAC, Supraventricular Premature Complexes

  • Causes
  1. Usually idiopathic and benign
  2. Catecholamine excess
  3. Hypoxia
  4. Myocardial Ischemia
  5. Congestive Heart Failure
  6. Acid-base disturbance
  7. Electrolyte abnormality
  • Signs
  • EKG Findings
  1. No compensatory pause
  2. P Wave included in Extrasystole
  3. Associated with right bundle branch
  4. Normal narrow QRS with normal axis
  • Precautions
  1. Supraventricular Premature Complexes (SVPCs) are associated with risk of Atrial Fibrillation and cardiac events
    1. Murakoshi (2015) Eur Heart J. 2015 Jan 14;36(3):170-8 +PMID:25358506 [PubMed]