Dextrocardia electrocardiogram

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editors-In-Chief: Priyamvada Singh, M.B.B.S. [[2]]; Cafer Zorkun, M.D., Ph.D. [3]; Keri Shafer, M.D. [4]; Claudia Hochberg, M.D.; Assistant Editor-In-Chief: Kristin Feeney, B.S. [[5]]

Overview

Electrocardiogram may be used as a diagnostic tool in the evaluation of an atrial septal defect. ECG findings associated with dextrocardia include an R wave inversion.

Electrocardiogram

It is possible to distinguish lead reversal and dextrocardia by watching the precordial leads. Dextrocardia will show an R wave inversion, whereas lead reversal will not.

The bottom EKG shows marked right axis deviation and loss of voltage across the precordium. There are also inverted P waves in leads I and aVL. The differential for inverted P waves in lead I and aVL is Dextrocardia vs Reversed Arm Leads. Since there is loss of voltage across the precordium this is Dextrocardia.

Special considerations

ECG leads must be placed in reversed positions on a person with Dextrocardia.

References

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