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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 video 1). New injection into the right arm showed normal bubbles arrival into the right atrium without evidence of patent foramen ovale (online supplementary figure, video 2). Comprehensive Cardiac CT Angiography with intravenous cannula located in the right arm confirmed the presence of a persistent left superior vena cava draining into the left atrium (figure 2).1 ,2 The presence of left hemicranial and left upper limb venous drainage into the left atrium instead of the pulmonary circulation via the right heart chambers was the underlying cause of the oxygen desaturation. Transaminases levels reverted to normal values in the follow-up.
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Contributors JGM had the original idea, selected and processed the images and videos and reviewed the manuscript; EGL wrote the manuscript; MAC and LA-P were responsible for the overall content as guarantors.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; internally peer reviewed.