Simple Circuit = Safe Circuit
RPM >> Flow
You set pump RPMs and based on the preload and afterload, you get your flow
Preload Factors
- Volume (hypovolemia, bleeding)
- Cannula Diameter (also length, kinking, position)
- Viscosity (Hb, Temp)
when elevated,
can get cavitation, hemolysis (elevated LDH and plama-free Hb)
Afterload Factors
- Cannula Diameter (also length, kinking, position)
- Oxygenator Resistance
- SVR
Pressures
Pven
Normal -50 to -100
Ppre-Part=Pdelta (dP or delta P)
If Ppre is elevated and Part is normal, there is increased resistance in the oxygenator–? clot
Should be ~ 10 x flow (L) (20-50)
Part
Keep under 100
Heat Exchanger
Microtemp Lt or LSZ Heat Xchanger
Fiber Oxygenator
Gas inside
blood outside
Water inside
Sechrist Blender
fdO2
Sweep
FiO2
Tubing 3/8”