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Related Experiment Videos

Superior QRS axis in ventricular septal defect.

N J Shaw1, M J Godman, A Hayes

  • 1Royal Hospital for Sick Children, Edinburgh.

British Heart Journal
|October 1, 1989
PubMed
Summary

A superior QRS axis in electrocardiograms is linked to inlet ventricular septal defects. This finding helps differentiate specific types of ventricular septal defects (VSDs) based on electrical activity and anatomical location.

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Area of Science:

  • Cardiology
  • Pediatric Cardiology
  • Electrophysiology

Background:

  • Ventricular septal defects (VSDs) are common congenital heart abnormalities.
  • The QRS axis on an electrocardiogram (ECG) can provide clues about cardiac anatomy.
  • The relationship between superior QRS axis and VSD location requires further clarification.

Purpose of the Study:

  • To investigate the association between a superior QRS axis and the anatomical site of ventricular septal defects.
  • To determine if a superior QRS axis is indicative of specific VSD subtypes, such as atrioventricular canal defects.

Main Methods:

  • Retrospective analysis of electrocardiograms (ECGs) and echocardiographic data from 1031 patients with VSDs.
  • Classification of VSDs based on anatomical location, including inlet defects.

Related Experiment Videos

  • Correlation of superior QRS axis findings with VSD location and type.

    • Main Results:

    • A superior QRS axis was observed in 6.2% (64 out of 1031) of patients with VSDs.
    • In 59% of patients with a superior axis, the VSD was located in the inlet portion of the ventricular septum.
    • No cases with a superior axis were classified as isolated persistent atrioventricular canal type VSDs.

    Conclusions:

    • A superior QRS axis is associated with perimembranous inlet ventricular septal defects.
    • The presence of a superior QRS axis does not reliably characterize a VSD as being of the atrioventricular canal type.
    • ECG-derived QRS axis can aid in the anatomical localization of certain VSDs.