First Aid 2014 Rapid Review Equation Review Flashcards Preview

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Flashcards in First Aid 2014 Rapid Review Equation Review Deck (31):
1

Sensitivity

Sensitivity = TP / (TP + FN)

2

Specificity

Specificity = TN / (TN + FP)

3

Positive predictive value

PPV = TP / (TP + FP)

4

Negative predictive value

NPV = TN / (FN + TN)

5

Odds ratio (for case-control studies)

Odds ratio = (a/c) / (b/d) = (a × d) / (b × c)

6

Relative risk

Relative risk = [a/(a + b)] / [c/(c + d)]

7

Attributable risk

Attributable risk = [a / (a + b)] - [c / (c + d)]

8

Number needed to treat

NNT = 1/(absolute risk reduction)

9

Number needed to harm

NNH = 1/(attributable risk)

10

Hardy-Weinberg equilibrium

p² + 2pq + q² = 1 AND p + q = 1

11

Volume of distribution

Vd = (amount of drug in the body) / (plasma drug concentration)

12

Half-life

t½ = (0.693 × Vd) / (CL)

13

Drug clearance

CL = (rate of elimination of drug) / (plasma drug concentration) = Vd × Ke (elimination constant)

14

Loading dose

LD = (Cp × Vd) / (F)

15

Maintenance dose

D = (Cp × CL × tau) / (F)

16

Cardiac output

CO = (rate of O2 consumption) / [ (arterial O2 content) − (venous O2 content) ] OR CO = stroke volume × heart rate

17

Mean arterial pressure

MAP = (cardiac output) × (total peripheral resistance) OR MAP = (2/3) × diastolic + (1/3) × systolic

18

Stroke volume

SV = EDV - ESV

19

Ejection fraction

EF= (SV) / (EDV) = (EDV−ESV) / (EDV)

20

Resistance

Resistance = (driving pressure) / (flow) = (∆P) / (Q) = (8η [viscosity] × length ) / (πr⁴)

21

Net filtration pressure

Pnet = [(Pc - Pi) - (πc - πi)] OR Jv = net fluid flow = Kf × Pnet

22

Renal clearance

Cx = (Ux × V) / (Px)

23

Glomerular filtration rate

GFR = (Uinulin × V) / (Pinulin) = Cinulin OR GFR = Kf [(Pgc - Pbs) - (πgc - πbs)]

24

Effective renal plasma flow

ERPF = Upah × (V / Ppah) = Cpah

25

Renal blood flow

RBF = RPF / (1 − Hct)

26

Filtration fraction

FF = GFR / RPF

27

Henderson-Hasselbalch equation (for extracellular pH)

pH = 6.1 + log( [HCO₃⁻] / 0.03 × Pco₂)

28

Winters formula

Pco₂ = 1.5 [HCO₃⁻] + 8 ± 2

29

Physiologic dead space

Vd = Vt × [(Paco₂ - Peco₂) / (Paco₂)]

30

Pulmonary vascular resistance

PVR = (P pulm artery - P l atrium) / (cardiac output)

31

Alveolar gas equation

PAo₂ = PIo₂ - ( Paco₂ / R )