Jessica is a 23-year-old university student who presents to hospital with anorexia and symptoms
of a lower respiratory tract infection. She is otherwise healthy and is on no medications.
The remainder of her history is unremarkable except for a family history of sudden, unexplained
death in a maternal aunt.
Baseline blood work shows mild hypokalemia and a left lower lobe infiltrate on her chest xray.
She is admitted to hospital for correction of her electrolytes and is given clarithromycin for
her pneumonia. The following day, she suffers a
cardiac arrest. Polymorphic wide QRS complex tachycardia is seen on the monitor. A
post-resuscitation ECG demonstrates striking QT findings (Figure 1).
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