Hypertrophic cardiomyopathy Quiz: Ace Your Exams
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An 11-year-old girl presents to the pediatrician for assessment of recurrent palpitations and exertional dyspnea for one month. The patient is otherwise healthy and has no significant past medical history. The patient's grandmother died at an early age from drowning in a lake where she swam regularly. Temperature is 37.0 °C (98.6 °F), pulse is 84/min, respirations are 18/min, blood pressure is 117/5 mm Hg, and oxygen saturation is 99% on room air. On physical exam, a loud systolic ejection murmur is heard at the lower left sternal border and an S4 heart sound is present. Lungs are clear to auscultation bilaterally. ECG is ordered. Which of the following additional tests should be performed to make the diagnosis?
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