PMC5420050_01
Twelve-lead ECG obtained when the patient presented with complaints of fatigue and exertional limitation. The tracing reveals sinus rhythm at 44 bpm. A leftward axis is present and is new since his only ECG recorded 4 years earlier (see Figure 2). QT/QTc is prolonged (496/424 ms).
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PMC5420050_01_gr1.jpg
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On presentation, the patient's ECG showed sinus bradycardia (40-44 bpm), a previously undocumented leftward frontal axis, and a nonspecific intraventricular conduction disturbance (Figure 1).
Twelve-lead ECG obtained 4 years before that shown in Figure 1 as part of a routine physical examination. This is the patient's only prior ECG. At the time he was taking no cardioactive drugs. The tracing is normal, showing sinus rhythm with sinus arrhythmia and a heart rate averaging 65 bpm. QT/QTc is normal (386/404 ms).
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QT/ QTc intervals were prolonged (496/424 ms) and were longer than recorded on his only ECG recorded 4 years earlier (QT/QTc 386/404 ms; Figure 2).