The user reported to terumo cardiovascular during cardiopulmonary bypass the performance of the oxygenator decreased to po2 of 90 after 6.
5 hours of bypass.
As per user facility, the case ended up being a redo aortic root replacement/pa conduit implantation.
All acts were kept in the 400-500 range, act right before change out was 416.
Additional heparin administration on bypass was limited due to sufficient acts most of the case.
Not much heparin resistance was observed.
As per ccp he was told pre-cpb and early cpb lactate was elevated, at least 10.
The patient had pao2s in the 300-400s at about 50 fio2 at the peak cold set point of 28 degrees c, also the sweep averaged around 5 with a heavy -10 base deficit during this coldest point and a higher 40s paco2.
Lactate now 14.
It was during rewarm that the pao2 started to drop with great fio2 increase to eventually 100 percent.
The sweep also had to eventually be raised to 9-10 with climbing paco2 values.
Lactate also rose throughout the case with the last lactate being 20 before patient left the room.
At pao2 of about 95-100 and fio2/ sweep maxed, all connections of cpb ventilation were checked then the oxygenator was connected directly to tank, different arterial sample locations were drawn and radial which reflected similar values.
Pao2 coasted at 85 right before the circuit change out occurred.
Pao2 rose to 500s with new circuit.
The last venous saturation that was observed before circuit change was low 60s and patient pre change out was about 10-11 hgb and post change out was low 9 hbg.
For the change out, the new circuit was decided to be primed with 2 rbcs and 1 of ffp, chasing plasmalyte prime volume out, the change out occurred during rewarm period at the 32-34 degree mark.
In addition according to ccp, the high complexity of the case resulting in a longer bypass time (circuit change out occurred at the 6 hour and 40min mark) and the advanced lactate/ metabolic and respiratory acidosis throughout, the oxygenator had an excessively high settings for a long period of time which were the main factors.
After draining the old circuit, no clots were visible anywhere around the oxy nor the reservoir.
There was minimal blood loss.
There was 1-2 minute delay.
The product was changed out.
The surgery was completed successfully.
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