case_images: PMC5474543_01
case_images: 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.
case_images: CRIC2017-6250312.001.jpg
case_images: PMC5474543_01_CRIC2017-6250312.001.jpg
case_images: fig1
case_images: 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).
case_images: ECG in the telemetry unit demonstrating tachycardia with an irregular rhythm with presence of >3 different p morphologies consistent with multifocal atrial tachycardia (MAT).
case_images: CRIC2017-6250312.002.jpg
case_images: PMC5474543_01_CRIC2017-6250312.002.jpg
case_images: fig2
case_images: 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.
case_images: ECG after normalization of patient's magnesium level showing normal sinus rhythm.
case_images: CRIC2017-6250312.003.jpg
case_images: PMC5474543_01_CRIC2017-6250312.003.jpg
case_images: fig3
case_images: No further cardiac arrhythmias were noted on telemetry and all subsequent ECGs showed normal sinus rhythm (Figure 3).