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31 A 26-year-old woman presented to the emergency room with palpitations and
shortness of breath that started suddenly while she was eating breakfast.
Although the health-screening examination performed three weeks ago showed
delta waves in her ECG, echocardiography taken at a nearby hospital showed no
abnormal findings. At presentation, she was slightly hypotensive with a blood
pressure of 96/68 mmHg. Her ECG on admission showed a narrow QRS-complex
tachycardia at a rate of 180/min. Neither ST elevation nor T wave abnormality
was present.
What is the most probable diagnosis of the arrhythmia?
a Sinus tachycardia
b Sick sinus syndrome
c Ventricular tachycardia
d Supraventricular tachycardia
e Complete atrioventricular block
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