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Related Concept Videos

Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
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Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
Cardiac Action Potential01:30

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Interatrial block: correlation with P-terminal force.

David H Spodick1, Vignendra Ariyarajah, Robert Goldberg

  • 1Department of Medicine, Saint Vincent Hospital, Worcester, MA 01608, USA. David.Spodick@stvincenthospital.com

Clinical Cardiology
|April 9, 2009
PubMed
Summary
This summary is machine-generated.

Interatrial block (IAB) and P-terminal force (Ptf) are strongly correlated ECG findings. Recognizing one indicator suggests the presence of the other, aiding in diagnosing atrial abnormalities.

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Area of Science:

  • Cardiology
  • Electrocardiography
  • Cardiac Electrophysiology

Background:

  • Interatrial block (IAB), defined by P-duration > 100 ms, is often unrecognized in hospital settings.
  • IAB is associated with reduced left atrial function, left atrial enlargement, and predicts arrhythmias like atrial fibrillation.
  • P-terminal force (Ptf), a biphasic P wave in lead V1, also indicates left atrial abnormality, particularly enlargement.

Purpose of the Study:

  • To determine the intercorrelation between Interatrial Block (IAB) and P-terminal force (Ptf).
  • To investigate the relationship between two electrocardiographic indicators of left atrial abnormality.

Main Methods:

  • Two blinded observers analyzed 500 consecutive electrocardiograms (ECGs).
  • IAB was assessed using all 12 leads, while Ptf was evaluated in lead V1.
  • Discrepancies in measurements were resolved through a consensus conference.

Main Results:

  • A strong and statistically significant correlation was found between IAB and Ptf among 482 usable ECGs (chi(2) = 68.041; P < .001).
  • The findings indicate a robust relationship between these two ECG markers.

Conclusions:

  • Interatrial block (IAB) and P-terminal force (Ptf) are significantly and strongly correlated.
  • The presence of one finding should be anticipated when the other is identified, improving the recognition of left atrial abnormalities.