Supraventricular tachycardia Quiz: Ace Your Exams

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A 29-year-old woman presents to the emergency department for evaluation of recurrent palpitations for the past two days. The patient reports that every time she stands up, she feels lightheaded and dizzy. She says she sees stars and feels like she is going to pass out. She recently had a viral gastrointestinal infection that lasted three days. The patient has not recently traveled and has no significant past medical history. She does not smoke and drinks alcohol socially. Temperature is 37°C (98.6°F), pulse seated is 88/min and regular and upon standing is 120/min and regular, respirations are 20/min, blood pressure is 107/64 mmHg, and oxygen saturation is 99% on room air. The patient has dry mucous membranes. Cardiopulmonary exam reveals a regular pulse with clear lungs bilaterally on auscultation. The electrocardiogram (ECG) is shown below. Further clinical evaluation is most likely to reveal which of the following findings?

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History of endocrinopathy

History of chronic obstructive pulmonary disease (COPD)

Poor oral intake, vomiting, and diarrhea

Family history of arrythmia

Lower extremity swelling