PMC5474543_01
Initial ECG on presentation to the emergency department demonstrating tachycardia with an irregularly irregular rhythm and no obvious p waves consistent with atrial fibrillation with a rapid ventricular response.
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An electrocardiogram (ECG) was obtained and demonstrated atrial fibrillation with rapid ventricular response at a rate of 160/min with no PR or QT interval prolongation (Figure 1).
ECG in the telemetry unit demonstrating tachycardia with an irregular rhythm with presence of >3 different p morphologies consistent with multifocal atrial tachycardia (MAT).
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The patient's subsequent ECGs demonstrated various cardiac arrhythmias including sinus rhythm with premature atrial contractions, sinus arrhythmias, and multifocal atrial tachycardia (Figure 2) which spontaneously resolved.
ECG after normalization of patient's magnesium level showing normal sinus rhythm.
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No further cardiac arrhythmias were noted on telemetry and all subsequent ECGs showed normal sinus rhythm (Figure 3).