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
10. The A-a Gradient
A-aDO2 = PAO2 - PaO2
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

Bad PaO2, Bad Hb, Bad SaO2 then answer is gonna be in low 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: