Atrial septal defect electrocardiogram: Difference between revisions

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==Overview==
==Overview==
Electrocardiogram may be used as a diagnostic tool in the evaluation of an atrial septal defect. ECG findings associated with an atrial septal defect may include PR prolongation (first degree heart block), [[right bundle branch block]], [[right ventricular hypertrophy]], left and [[right axis deviation]], [[atrial fibrillation]], [[atrial flutter]], and [[junctional rhythm|junctional rhythms]].
Electrocardiogram may be used as a diagnostic tool in the evaluation of an atrial septal defect. ECG findings associated with an atrial septal defect may include PR prolongation ([[first degree heart block]]), [[right bundle branch block]], [[right ventricular hypertrophy]], left and [[right axis deviation]], [[atrial fibrillation]], [[atrial flutter]], and [[junctional rhythm|junctional rhythms]].


==Electrocardiography==
==Electrocardiography==

Revision as of 19:18, 22 August 2011

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-In-Chief: Priyamvada Singh, M.B.B.S. [[2]]; Cafer Zorkun, M.D., Ph.D. [3]; Assistant Editor(s)-In-Chief: Kristin Feeney, B.S. [[4]]

Overview

Electrocardiogram may be used as a diagnostic tool in the evaluation of an atrial septal defect. ECG findings associated with an atrial septal defect may include PR prolongation (first degree heart block), right bundle branch block, right ventricular hypertrophy, left and right axis deviation, atrial fibrillation, atrial flutter, and junctional rhythms.

Electrocardiography

The ECG findings in atrial septal defect vary with the type of defect present.

  • It may be normal with an uncomplicated ASD and a small shunt.
  • Individuals with atrial septal defects may have a prolonged PR interval (a first degree heart block). The prolongation of the PR interval is probably due to the enlargement of the atria that is common in ASDs and the increased distance due to the defect itself. The first degree heart block is found to happen more frequently with ostium primum ASD compared to the other types due to the involvement of 'Bundle of His' present in the close proximity of the defect. Both of these can cause an increased distance of internodal conduction from the SA node to the AV node.[1]
  • The QRS complex may be slightly prolonged and has a characteristic rSr' or rsR' pattern that is contributed to the disproportionate thickening of the right ventricular outflow tract (the last portion of the ventricle to depolarize).
12 lead EKG shows the rSR' pattern in V1 (R' greater than S with T wave inversion which is commonly seen in volume overload in Right Ventricular Hypertrophy)


References

  1. Clark E, Kugler J (1982). "Preoperative secundum atrial septal defect with coexisting sinus node and atrioventricular node dysfunction". Circulation. 65 (5): 976–80. PMID 7074763.

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