Biostats Flashcards by Andrew Herrmann

Q

Sensitivity

A

TP/TP+FN

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Q

Specificity

A

TN/TN+FP

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Q

PPV

A

TP/TP+FP

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Q

NPV

A

TN/TN+FN

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Q

Odds Ratio

A

AD/BC

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Q

Relative risk

A

(A/A+B) / (C/C+D)

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Q

Attributable risk

A

(A/A+B) - (C/C+D)

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Q

Relative risk reduction

A

1 - AD/BC

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Q

Absolute risk reduction

A

(C/C+D) - (A/A+B)

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Q

NNT

A

1/ARR

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Q

NNH

A

1/AR

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Q

Vd

A

Amt in body / Plasma concentration

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Q

Half life

A

0.7 x Vd / Cl

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Q

Clearance

Given an elimination constant?

A

U x V / P

Vd x Ke

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Q

Loading dose

A

Cp x Vd / F

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Q

Maintenance dose

A

Cp x Cl x tau / F

Q

Cardiac output (w/ oxygen values)

A

Rate of consumption / (Arterial - Venous)

Q

MAP (given systolic and diastolic)

A

2/3 diastolic + 1/3 systolic

Q

RBF (given RPF and Hct)

A

RBF = RPF / (1-Hct)

Q

Filtration fraction

A

GFR/RPF

Q

pH (given ABG)

A

6.1 + log (HCO3/(.03*PCO2))

Q

PCO2 (given HCO3)

A

1.5(HCO3) + 8 +/- 2

Q

Physiologic dead space

A

Vt x ((PaCO2 - PeCO2)/PaCO2)

Q

PVR (given pressures and output)

A

(P pulm artery - P L atrium) / C.O.

Q

Alveolar gas equation

A

PAO2 = PIO2 - (PaCO2/R)