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All ECG 88

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Source: Learn the Heart

This ECG shows normal sinus rhythm at about 70 beats per minute with premature atrial contractions. There is marked right axis deviation and no R waves in the lateral chest leads. The findings are consistent with dextrocardia. 

In lead I, the ECG findings of dextrocardia include a predominantly negative P wave (when sinus rhythm is present), negative QRS complex and negative T wave. There is a rightward frontal plane QRS axis and low voltage in leads V3-V6. The dextrocardia ECG findings can appear similar to limb lead reversal in lead I; however, if the limb leads are simply misplaced, leads V3-V6 will appear normal.

Related: Premature Atrial Contractions (PACs) ECG ReviewDetermining Axis