# Equations for CRT

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1. Static Compliance
2. Alveolar minute ventilation

Estimated 1ml per lb of ideal body weight for VD
3. Cardiac Output

Heart rate X stroke volume
4. Mean arteriol pressure

• Mean: 90
• Monitors perfusion
• Normal:120/80
5. Cerebral Perfusion Pressure
CPP=MAP-ICP

Normal: 70-90
6. Smoking History
Pack years= # of packs/day x # of years smoked

4 packs a day x 10 years equals 40 pack years
7. ETT size
Size= weight in kg divided by 10

Oral: 21-25 cm mark at lip

Nasal: 26-29 cm mark
8. Catheter size

8.0/2 =4x3 =12 french
9. Alveolar air equation
(FiO2 x 7) - (PaCO2 + 10)

• 50%= 300 torr
• 100% O2= 600 torr
11. Arterial oxygen content
(CaO2)
CaO2 = (Hb x 1.34 x SaO2) + (PaO2 x .003)

Normal: 17-20%

Good PaO2, good Hb, Good SaO2 then answer is gonna be in high teens

12. Mixed venous oxygen content
(CVO2)

CVO2 = (Hb x 1.34 x SVO2) + (PVO2 x .003)

Normal: 14%
13. Arteriol- Venous oxygen content difference
C(a-V)O2
C(a-v)O2 = CaO2-CvO2

Normal:4-5%
14. Shunt equation
(Qs/Qt)
Calculate the percent shunt when the A-aDO2 is 300 torr and the C(a-v)O2 is 3.6 vol %!

For every 100 on the A-a gradient, add another 5% shunt to normal

15. Deadspace to tidal volume ratio
(VD/VT)
16. Duration of Flow
17. Air to oxygen Ratio
18. Total flow
Total flow=(flow meter setting x factor)

What is the total flow when a venti mask is set at 5 L/min and the dilution control is set at 28%?

• Air/O2 entrainment ratio is 10:1 for 28%
• Total flow factor is 11

5 x 11 = 55 L/min
19. Raw
(Peak pressure- Plateau pressure)/ flow L/sec
 Author: darrell2662 ID: 186403 Card Set: Equations for CRT Updated: 2012-12-01 20:10:36 Tags: Equations Folders: Description: Equations Show Answers: