topic 2 Flashcards
Neonatal:
less than 30 days
pediatrics
up to 18 yrs
Neonates have immature
myocardium
Neonates utilize _______ for energy
glucose
Immature myocardium prone to
stretch injury
Adult circuits tend to be
one size fits all”
blood volume for < 10 (kg)
85 cc/kg
blood volume for 11-20 kg
80 cc/kg
blood volume for 21-30 kg
75 cc/kg
blood volume for 31-40 kg
70 cc/kg
blood volume for >40 kg
65 cc/kg
A 1100 gram child has how much BV
93.5 mL
Adult circuit characteristics
3/8” arterial line 3/8”, 1⁄2” venous line Large oxygenators Larger priming volume
pediatric circuit cicuits
1/8”, 3/16”, 1⁄4”, 3/8” arterial line 3/16” 1⁄4”, 3/8”, 1⁄2” venous line Small/Med/Large Oxygenators Smaller Priming Volumes
Neonatal Pack
3/16” x 1⁄4”
infant pack
1⁄4” x 1⁄4”
pediatric pack
1⁄4” x 3/8”
small adult pack
3/8” x 3/8”
adult pack
3/8” x 1⁄2”
sequence to determine appropriate pediatric circuit
It is Imperative to ascertain kg weight prior to choosing 1. Determine BSA (kg weight may suffice) 2. Determine maximum flow rate (KG weight based or BSA based) 3.Choose appropriate pump boot 4. Pick arterial cannula 5. Determine arterial line size 6. Pick venous cannula 7. Determine venous line size
*Packs (1/8” x 3/16”, 3/16”x3/16”, 3/16”x1⁄4”, 1⁄4” x 1⁄4”, 1⁄4”x3/8”, 3/8”x3/8”, 3/8”x1⁄2”)
8. Choose oxygenator 9. Choose arterial filter
CPB normothermic flows for 0-3 kg
200 cc/kg
CPB normothermic flows for 3-10 kg
150 cc/kg
CPB normothermic flows for 10-15 kg
125 cc/kg 1
CPB normothermic flows for 15-30 kg
100 cc/kg
CPB normothermic flows for >30kg
75cc/kg
CPB normothermic flows for >55kg
65cc/kg
kg weight x cc/kg/min flow =
max flow 5.3 kg x 150 cc/kg/min = 795 cc/min or 0.795 L/min
Normothermic CPB flows : 1. BSA:
1.8 l/m/m2 up to 2.4 l/m/m2 2.4 l/m/m2 X 2.00 m2 BSA = 4.8 L/m
Normothermic CPB flows .KG:
50-75 cc/kg/min 75 cc/kg/min x 70 kg = 5.25 L/m
SV FOR Rollerpump Callibration Chart: Boot Diameter 3/16
7 CC x 100 rpm =700 ml/monn
SV FORRollerpump Callibration Chart: Boot Diameter 1/4
13 CC x 100 rpm = 1300 ml/min
SV FOR Rollerpump Callibration Chart: Boot Diameter 3/8
27 CC x 100 rpm = 2700 ml/min
SV FOR Rollerpump Callibration Chart: Boot Diameter 1/2
45 CC x 100 rpm =4500 ml/min
Do NOT exceed ______ RPM for max tubing flow
100
reynolds # equals
(velocity of fluid)(density)(diameter)/viscosity
Poiseuille’s law
Flow = (ΔP x πr4)/( Lx V x 8)
pediatric arterial cannula selection aim:
Aim: utilize the smallest cannula w/ the highest flow rate
Do NOT exceed pressure drop > 100 mmHg
Critical velocity is reached when laminar flow becomes turbulent (Reynolds #)
Higher pressures = higher sheer stress = hemolysis = bad
pediatric venous cannula selection aim:
Aim: drain the patient with the smallest cannulas
Be aware if the cannulation is bicaval or single atrial cannula
Pressure drop is in the -30 to -40 range (pressure-flow curve)
Vacuum Assist Venous Drainage (VAVD) may help but at a cost (micro-emboli may be associated with VAVD)
tubing pack selection for single atrial cannula neonatal
3/16,1/4 <800ml/min
tubing pack selection for single atrial cannula infant
1/4,1/4 800-1278 ml/min
tubing pack selection for single atrial cannula peds
1/4,3/8 1278-2898 ml/min
tubing pack selection for single atrial cannula small adult
3/8,3/8 2898-3500 ml/min
tubing pack selection for single atrial cannula adult
3/8,1/2 >3500 ml/min
tubing pack selection for bicaval atrial cannula neonatal
3/16,1/4 < 800 ml/min.