Rapid Review Equations

Question 1

Sensitivity

Answer 1

TP/(TP+FN)

Question 2

Specificity

Answer 2

TN/(TN+FP)

Question 3

PPV

Answer 3

TP/TP+FP

Question 4

NPV

Answer 4

TN/TN+FN

Question 5

Odds Ratio

Answer 5

a/c / b/d

Question 6

RR

Answer 6

a/(a+b) / c/(c+d)

Question 7

AR

Answer 7

a/a+b - c/c+d

Question 8

RRR

Answer 8

1-RR

Question 9

ARR

Answer 9

c/c+d - a/a+b

Question 10

NNT

Answer 10

1/ARR

Question 11

NNH

Answer 11

1/AR

Question 12

Hardy-Weinberg

Answer 12

p2+2pq+q2

p+q=1

Question 13

Vd

Answer 13

amount of drug in the body/plasma drug concentration

Question 14

HL

Answer 14

0.7xVd/CL

Question 15

Loading Dose

Answer 15

Cp x Vd/ F

F is oral bioavailability usually 1

Question 16

Maintenance Dose

Answer 16

Cp x CL x t/ F

Question 17

Cardiac output

Answer 17

HR x SV

rate of O2 consumption/ arterial-venous O2 content

Question 18

MAP

Answer 18

CO x TPR

2/3diastolic + 1/3systolic

Question 19

Stroke volume

Answer 19

EDV-ESV

Question 20

Ejection Fraction

Answer 20

EDV-ESV / EDV

or SV/EDV

Question 21

Resistance

Answer 21

changeP/FlowQ

~viscosity x length
1/~ r^4

Question 22

Capillary fluid exchange

Answer 22

constant (hydrostaticCap-hydrostaticInterstitial)- (oncotic-oncotic)

Question 23

GFR

Answer 23

Uinulin x V/ P

Or capillary fluid exchange eq

Question 24

RPF

Answer 24

Upah x V/P

Question 25

RBF

Answer 25

RPF/1-hematocrit

Question 26

FF

Answer 26

GFR/RPF

Question 27

Henderson Hasselbalch

Answer 27

pH=6.1 + log (HCO3-/.03PcO2)

Question 28

Winters

Answer 28

pCO2= 1.5 (HCO3-) +8 +/- 2

Question 29

Physiologic dead space

Answer 29

Vd= Taco x Paco- Peco/Paco

Question 30

Pulmonary vascular resistance

Answer 30

Ppulma- Pleftatrium/CO

Question 31

Alveolar gas eq

Answer 31

PAO2= PIO2- (PaCO2/R)