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A 48-year-old asymptomatic male, presented with mild elevation of transaminases and incidentally a basal oxygen saturation of 91% was registered. To rule out right to left shunting, the patient underwent a transoesophageal echocardiography. Initially, an intravenous cannula positioned on the left arm was used to inject agitated saline contrast. Unexpected opacification of the left atrium was observed (figure 1, online supplementary …
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