Abstract
The application of epi-aortic ultrasound to identify and cannulate the true lumen
of a dissecting descending thoracic aneurysm for which left atrial–femoral partial
bypass was required is described. Because of scarring and inflammation, cannulation
of the femoral artery could not be accomplished. For placement of the cannula in the
descending aorta, we used an epi-aortic probe to identify the true lumen of the dissection
and to direct the guidewire appropriately. The aortic cannula was passed over the
wire and its position was also confirmed by ultrasound. Left atrial to descending
aorta bypass was initiated without complications.
