CPB equipment

Question 1

what is the mechanism of heat transfer

Answer 1

absorption, convention, works its way as the blood closest to the heat transfer is highest

gets uniformly heated or cooled

Question 1

if oxygen is at 100%

Answer 1

your PO2 is 500.

take 500 x your percentage of FiO2

Question 2

the slower the flow (heat exchanger

Answer 2

the greater the heat transfer

Question 3

why does pressure drop in oxygenator

Answer 3

resistance due to the filters

Question 4

what is ABG?

Question 5

if you have a pressure post oxygenator and there is a problem with the oxygenator

Answer 5

• If you have a pressure sensor post oxygenator, you can see a very low pressure if oxygenator is clotted. Pressure is highest at oxygenator, so if the oxygenator is clotted and you aren’t reading those pressures than it will be hard to see the problem.

Question 6

roller head

Answer 6

positive displacement, works independently of the pump

need pump to be occlusive enough but not over or under occlusive

if it is over occlusive, tubing can touch each other and particles might break off, which is spallation. also causes –> too much occlusion on the roller heads

cavitation - too much negative pressure, you can pull air out of the solution

Question 7

centrifugal heads

Answer 7

patients pressure go up, greater the resistance, lower the flow –> RPMS stay the same

Lower the pressure, lower the resistance, higher the flow –> RPMs stay the same

centrifugal head is susceptible to resistance

it is a great bubble trap

if a big airbubble gets in it, the Pump with SHUT DOWN

put bubble trap after oxygenator

Question 8

know the difference between cardiotomy & venous reservoir