ECG Quest > Basics > Artefact > Electrode misplacement > LA/RA electrode reversal

LA/RA electrode reversal

If the left and right arm electrodes are accidentally swapped over, Lead I will be completely upside down, aVR & aVL will be switched, and II & III will be switched. The easiest of these signs to see is the inverted lead I. The chest leads will not be affected. This error can look similar to dextrocardia, but the difference is that with dextrocardia the chest leads are not normal.

See also: Electrode misplacement

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In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea LA/RA electrode reversal 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 17th December 2018 – Interpretation

This ECG is from a woman in her 50s who presented with chest pain and dyspnoea.

This ECG shows lead I is completely inverted due to electrode misplacement. The left and right arm electrodes have been swapped accidentally.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Extreme Axis LA/RA electrode reversal Sinus arrhythmia 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 15th October 2018 – Interpretation

This ECG is from a woman in her 40s who presented after an episode of chest pain.

In the ECGquest archives, this ECG has been tagged with: - Bradycardia Extreme Axis LA/RA electrode reversal Regular Pacemaker spikes Wide QRS Ventricular pacemaker 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
ECG of the Week – 27th August 2018 – Interpretation
In the ECGquest archives, this ECG has been tagged with: - Weakness Extreme Axis LA/RA electrode reversal Flat T waves Wide P waves 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
ECG of the Week – 9th July 2018 – Interpretation

This ECG is from a woman in her 80s who presented with lethargy and weakness, on a background of schistosomiasis-related liver disease, portal hypertension and ascites.

In the ECGquest archives, this ECG has been tagged with: - Chest pain LA/RA electrode reversal 12-Lead Serial 12-lead Dr Smith's ECG Blog CC BY-NC
A Middle-Aged Man with crescendo angina – repeat in pain

This ECG is from a middle aged man who presented with chest pain that was central, tight, sharp and 9/10. It had been coming and going at first, but then became constant around 2.5 hours ago.

In the ECGquest archives, this ECG has been tagged with: - LA/RA electrode reversal 12-Lead LITFL Dr Edward Burns CC-BY-NC-SA
LA/RA reversal simulating dextrocardia