picu board formulas

Question 1

CaO2 =

Answer 1

1.36 x Hb (g/dL) x % sat + 0.003 (PaO2)

Question 2

VO2 =

Answer 2

(CaO2-CvO2) x CO

Question 3

DO2 (ml/min) =

Answer 3

CO x CaO2

Question 4

wall stress =

Answer 4

(pressure x radius)/(2w)

Question 5

V/Q =

Answer 5

((8.63 x R(CaO2-CmvO2))/PaCO2

Question 6

clearance =

Answer 6

k x Vd

Question 7

GFR with inulin =

Answer 7

(V x Uin)/Pin

Question 8

GFR with bedside schwartz =

Answer 8

(.41 x height in cm)/Cr

Question 9

O2ER =

Answer 9

(CaO2-CvO2)/(CaO2)

Question 10

Qp =

Answer 10

(VO2)/(Cpv-Cpa)

Question 11

Qs =

Answer 11

(VO2)/(Cao-Cpa)

Question 12

SVR =

Answer 12

(MAP-CVP)/CO x 80; dynes-s/cm^5

Question 13

PVR =

Answer 13

(MPAP-PAOP)/CO x 80; dynes-s/cm^5

Question 14

T1/2 =

Answer 14

0.693/k

Question 15

Reynolds number =

Answer 15

2vrp/u; u is viscosity, p is density

Question 16

FEna =

Answer 16

(Una x Pna)/(Ucr x Pcr)

Question 17

positive likelihood ratio =

Answer 17

sensitivity/(1-specificity)

Question 18

VCO2 in HFOV =

Answer 18

f x Tv^2

Question 19

resistance of tube equals =

Answer 19

(8nl)/((pie)(r^4))

Question 20

MAP =

Answer 20

CO x SVR

Question 21

MAP =

Answer 21

DP + 1/3(pulse pressure)

Question 22

venous return =

Answer 22

(Pms-Pra)/Rv

Question 23

mean airway pressure =

Answer 23

((Ti x PIP) + (Te x PEEP))/(Ti+Te)

Question 24

calculated osmolarity =

Answer 24

(Na x 2) + (glucose/18) + (BUN/2.8)

Question 25

volume of distribution =

Answer 25

total amount of drug in the body/concentration in the plasma

Question 26

total amount of drug in the body, or desired loading dose =

Answer 26

Vd x concentration(desired)

Question 27

clearance =

Answer 27

k x Vd