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USMLE > Equation Review > Flashcards

Equation Review Flashcards

1
Q

Sensitivity

A

TP/(TP+FN)

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2
Q

Specificity

A

TN/(TN+FP)

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3
Q

Positive Predictive Value

A

TP/(TP+FP)

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4
Q

Negative Predictive Value

A

TN/(TN+FN)

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5
Q

Odds ratio (for case-control studies)

A

A/C divided by b/d = ad/bc

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6
Q

Relative Risk

A

A/(a+b) divided by C/(c+d)

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7
Q

Attributable risk

A

A/a+b - C/c+d

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8
Q

Relative risk reduction

A

1-RR

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9
Q

Absolute risk reduction

A

C/c+d -a/a+b

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10
Q

NNT

A

1/ARR

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11
Q

NNH

A

1/AR

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12
Q

Hardy-Weinberg equation

A

p^2=2pq+q^2=1

p+q=1

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13
Q

Volume of distribution

A

Amount of drug in body/ plasma concentration of drug

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14
Q

Half life

A

O.693*Vd/CL

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15
Q

Drug clearance

A

Rate of elimination of drug/ plasma concentration of drug =

Vd * Ke (elimination constant)

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16
Q

Loading dose

17
Q

Maintenance dose

18
Q

Cardiac output

A

Rate of O2 consumption/ arterial O2 content- venous O2 content

CO=SV*HR

19
Q

MAP

A

CO*TPR

2/3 DBP + 1/3 SBP

20
Q

Stoke volume

21
Q

Ejection fraction

A

SV/EDV = EDV-ESV/EDV

22
Q

Resistance

A

Change in pressure/ flow (Q)=

8n (viscosity)* length/ pi r^4

23
Q

Capillary fluid exchange

A

Kvetch= net fluid flow=Kf/(Pc-Pi) - oncotic pressure( £c-i)

24
Q

Renal Clearance

A

Cx= UxV/Px

25
Q

GFR

A

Uinulin *V/Pinulin = Cinulin

26
Q

Effective renal plasma flow

A

UPAH * V/PPAH = CPAH

27
Q

Renal blood flow

A

RPG/ 1-Hct

28
Q

Filtration fraction

29
Q

Winters formula

A

PCo2=1.5 [HCO3-] +8 +- 2

30
Q

Physiologic dead space

A

VD= VT* PaCO2- PECO2/ PaCO2

31
Q

Pulmonary vascular resistance

A

Ppulm artery-PLatrium/ CO

32
Q

Alveolar gas equation

A

PAO2 = PIO2 - PaCO2/R

USMLE (18 decks)

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