Retrograde P waves

Retrograde P waves occur when the impulse travels back up through the atria from an origin in the AV node or below. These waves can occur before, during or after a QRS complex. They may be inverted.

See also: P wave

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In the ECGquest archives, this ECG has been tagged with: - Incorrect Machine Interpretation Inverted P waves Narrow QRS Retrograde P waves Short PR Accelerated junctional rhythm 12-Lead Dr Smith's ECG Blog CC BY-NC
What is going on here?? (The computer called it “STEMI” and “Intraventricular Conduction Delay”!!)
In the ECGquest archives, this ECG has been tagged with: - Retrograde P waves Wide QRS Accelerated idioventricular rhythm Acute Anterior MI 12-Lead Dr Smith's ECG Blog CC BY-NC
I saw this on the computer. Most physicians, at first glance, get this wrong. What is it?

This ECG is from a patient of unknown age who presented with chest pain. This ECG was recorded when they became hypotensive after a mid-LAD occlusion was opened and stented.

This ECG shows AIVR with borderline excessive discordant ST elevation in V2. The cause was the anterior MI.