PMC8403020_01
Apple watch record of the patient's heart rate.
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Apple Watch (Apple Watch Series 4) recorded a high resting heart rate of 210 beats/min (Figure 1). Alarmed at the elevated heart rate, he hurried to the emergency department.
EKG showing supraventricular tachycardia.
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A 12 lead electrocardiogram (ECG) was performed (Figure 2) and revealed supraventricular tachycardia at the rate of 184 b/min.
EKG showing normal sinus rhythm following electrical cardioversion.
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Adenosine 6 mg and then two additional doses of 12 mg via cubital peripheral line but failed to revert to a normal sinus rhythm. At this point, he developed hypotension and was quickly electrically cardioverted (synchronized DC 50 Joules) and successfully reverted to normal sinus rhythm as seen in the repeat ECG below (Figure 3).