Formulas

Question 1

Cardiac index

Answer 1

CO/BSA

Normal = 2.5 to 4L/min/m2

Question 2

Stroke volume

Answer 2

CO x 1000/HR

Normal = 60-90ml/beat

Question 3

Stroke index

Answer 3

SV/BSA

40-60ml/beat/m2

Question 4

MAP

Answer 4

Diastolic + 1/3 pulse pressure

Question 5

SVR

Answer 5

(MAP-CVP / CO ) x 79.9

Normal = 1200-1500 dyne-cm-sec-5

Question 6

PVR

Answer 6

PAP-PCWP / CO x 79.9

Normal = 100-300

Question 7

A-a gradient

Answer 7

AaO2 = PAO2 - PaO2
Normal = <10mmhg

Question 8

Arterial oxygen content

Answer 8

CaO2 = (SaO2)(Hb x 1.34) + PaO2(0.0031)
Normal = 21ml/100ml

Question 9

Mixed venous O2

Answer 9

CVO2 = (SVO2)(Hb x 1.34) + PvO2(0.0031)

15ml/100ml

Question 10

Normal venous O2 consumption

Answer 10

240ml/min

Question 11

Alveolar gas equation

Answer 11

PAO2 = PIO2 - PACO2/R

PIO2 =( atm pressure - 47) x FiO2

Question 12

Volume of gas administered

Answer 12

(FGF x Vap pressure)/ (ATM pressure - vap pressure)

Question 13

How much does pH change for every 1 degree Celsius change?

Answer 13

0.017

Question 14

How much O2 left in tank?

Answer 14

Pressure/(200xflow)

Question 15

O2 cylinder =

Color?

Answer 15

660L @ 1900psig, decreases linearly

Green in US, white everywhere else

Question 16

Nitrous cylinder =

Answer 16

1590 @ 745, stays at 745 until 25% full

Blue

Question 17

CO2 cylinders =

Answer 17

1590@ 838

Grey

Question 18

Air cylinders =

Answer 18

625@1900

Yellow

Question 19

Helium cylinder

Answer 19

500@1600

Brown

Question 20

Volume of anesthetic consumed in 1 hr

Answer 20

3 x FGF x vol% of anesthetic vapor

1ml of anesthesia liquid = 200ml of vapor

Question 21

O2 consumption =

Answer 21

3-4ml/kg/min

Question 22

FRC =

Answer 22

30ml/kg

Question 23

Steroid conversions–

7.5mg dexamethasone = ? Prednisone, hydrocortisone?

Answer 23

50mg prednisone

200mg hydrocortisone

Question 24

Allowable blood loss

Answer 24

EBV x (Hct - target Hct) / Hct

Question 25

Fick equation for SVO2

Answer 25

SaO2- [vO2/(CO x Hb x 1.36)]

Question 26

What shifts Hb Curve to right?

Answer 26

CAdet face right! Increases in
CO2
Acid
DPG
Exercise 
Temperature

Question 27

Winter formula

Answer 27

PCO2 = 1.5 HCO3 + 8 +/- 2