Additional File 3.

Intracardiac echocardiography showing sliding of the needle towards the aorta. The transseptal needle is already in the oval fossa with its tip pointing to the aorta. This is especially clearly visible after a premature beat.

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Shalganov et al. Cardiovascular Ultrasound 2005 3:5   doi:10.1186/1476-7120-3-5