| http://www.w3.org/ns/prov#value | - Since the pumps are inserted with the patient's open chest and the heart is exposed, the surgeon can readily feel the heart and easily ascertain that the tip of the cannulae has passed across the proper valve and into the aorta or pulmonary artery as desired, rather than across an inflow valve and into the left atrium or right atrium, which would be improper.
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