It was reported there a quality issue with an integrated positive pressure relief valve on my venous reservoir.When initiating cardiopulmonary bypass, the negative venous pressure did not correlate with the vacuum assist regulator pressure.I traced all of my lines and made sure all of my connections were secure.I had other perfusionists come in the room to help me troubleshoot the issue and we found that the integrated positive pressure relief valve was faulty.During closing the surgical site, that positive pressure valve had been sucked into the venous reservoir and was on the back side of the filter screen (still in the reservoir).
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