LA/RA electrode reversal

Some electrode swaps are hard to pick, but if you notice that Lead I has become a complete upside-down mirror image of normal then check the left and right arm electrodes. This pattern can be caused by accidentally putting the left arm electrode (LA) on the right arm, and vice versa. If in doubt, repeat the ECG and double check that RA is on the right arm and LA on the left arm.

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ECG Library (7)

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In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea 12-Lead LA/RA electrode reversal ECG of the Week CC-BY-NC-SA
ECG of the Week – 17th December 2018 – Interpretation 28865

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 12-Lead LA/RA electrode reversal Extreme Axis Sinus arrhythmia ECG of the Week CC-BY-NC-SA
ECG of the Week – 15th October 2018 – Interpretation 27647

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: - 12-Lead LA/RA electrode reversal Bradycardia Extreme Axis Pacemaker spikes Regular Wide QRS Ventricular pacemaker ECG of the Week CC-BY-NC-SA
ECG of the Week – 27th August 2018 – Interpretation 26730
In the ECGquest archives, this ECG has been tagged with: - Weakness 12-Lead LA/RA electrode reversal Extreme Axis Flat T waves Wide P waves ECG of the Week CC-BY-NC-SA
ECG of the Week – 9th July 2018 – Interpretation 25931

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 12-Lead LA/RA electrode reversal Serial 12-lead Dr Smith's ECG Blog CC BY-NC
A Middle-Aged Man with crescendo angina – repeat in pain 16807

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: - 12-Lead LA/RA electrode reversal LITFL CC-BY-NC-SA
LA/RA reversal simulating dextrocardia 697