Pediatric Second-Degree Atrioventricular Block Differential Diagnoses

Updated: Sep 11, 2019
  • Author: M Silvana Horenstein, MD; Chief Editor: Syamasundar Rao Patnana, MD  more...
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Diagnostic Considerations

The differential diagnosis of second-degree atrioventricular (AV) block is limited, although the potential etiologies may widely vary. Atrial tachycardias with second-degree block or nonconducted premature atrial stimuli are occasionally mistaken for second-degree AV block. This may be avoided by paying close attention to the P-wave rate, morphology, and regularity, recognizing that sinus arrhythmia is a normal finding in children. Marked sinus arrhythmia is also often mistaken for second-degree AV block.

Differentiating ECG AV block into its subtypes of Wenckebach, non-Wenckebach, 2:1, or high-grade AV is very important.

Differential Diagnoses