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Flashcards in Equations Deck (33):
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)

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6

Relative risk

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7

Attributable risk

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8

Relative risk reduction

RRR = 1 − RR

9

Absolute risk reduction

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10

Number needed to treat

NNT = 1/ARR

11

Number needed to harm

NNH = 1/AR

12

Hardy-Weinberg equilibrium

  • p2 + 2pq + q2 = 1
  • p + q = 1

13

Volume of distribution

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14

Half-life

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15

Drug clearance

CL = Vd x Kc

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16

Loading dose

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17

Maintenance dose

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18

Cardiac output

CO = stroke volume × heart rate

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19

Mean arterial pressure

  • MAP = cardiac output × total peripheral resistance
  • MAP = 2 ⁄3 diastolic + 1 ⁄3 systolic

20

Stroke volume

SV = EDV – ESV

21

Ejection fraction

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22

Resistance

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23

Capillary fluid exchange

Jv = net fluid flow = Kf[(Pc − Pi) − ς(πc − πi)]

24

Renal clearance

Cx = UxV/Px

25

Glomerular filtration rate

  • GFR = Uinulin × V/Pinulin = Cinulin
  • GFR = Kf [(PGC – PBS) – (πGC – πBS)]

26

Effective renal plasma flow

eRPF = UPAH × V/PPAH = CPAH

27

Renal blood flow

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28

Henderson-Hasselbalch equation (for extracellular pH)

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29

Filtration fraction

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30

Winters formula

Pco2 = 1.5 [HCO3–] + 8 ± 2

31

Physiologic dead space

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32

Pulmonary vascular resistance

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33

Alveolar gas equation

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