Exercise-Induced Intrapulmonary Arteriovenous Shunt in a Patient Complaining of Dyspnea during Strenuous Exercise. 2014

Tae-Jun Kim, and Sung-Ai Kim, and Seong-Eun Hong, and Dong-Min Jung, and Nan-Young Choi, and Yong-Kyun Kim, and Seung-Ah Park, and Soon-Young Kim, and Woo-Jung Park
Division of Cardiology, Hallym Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.

A 51-year-old highly fit man presented for dyspnea with strenuous aerobic exercise. The patient was asymptomatic and all tests were normal at rest. With increasing exercise intensity, he suddenly complained of dyspnea and showed a severe exercise-induced hypoxemia with an excessive alveolar-arterial oxygen tension difference. In agitated saline contrast echocardiography at peak exercise, a large amount of left to right shunt was identified after > 5 cardiac cycles, which suggests the presence of exercise-induced intrapulmonary arteriovenous shunt in this patient.

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