Equations

Question 1

Relative Risk

Answer 1

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

Question 2

Attributable risk

Answer 2

a/a+b - c/c+d

adverse event w/ tx. - adverse event w/o tx

Question 3

Number needed to treat

Answer 3

NNT= 1/absolute risk reduction

Question 4

Harvey-Weinberg equilibrium

Answer 4

p2+2pq+q2

p+q=1

Question 5

Volume of distribution

Answer 5

amount of drug in body/ plasma drug concentration

Question 6

Half life

Answer 6

.7 x Vd/ CL

Question 7

Drug clearance

Answer 7

rate of elimination of drug/ plasma drug concentration

Vd x Ke (elimination constant)

Question 8

Loading dose

Answer 8

LD= Cp x Vd/ F

Question 9

Maintenance dose

Answer 9

Cp x CL x t / F

Question 10

Cardiac output (2 equations)

Answer 10

CO= rate of O2 consumption/ arterial O2 content- venous O2 content

CO= SV x HR

Question 11

Mean arterial pressure (2 equations)

Answer 11

MAP= CO x TPR (V=IR)

MAP= 2/3 diastolic + 1/3 systolic

Question 12

Stroke volume

Answer 12

SV= EDV-ESV

Question 13

Ejection Fraction (2 equations)

Answer 13

EF= SV/EDV = EDV-ESV/ EDV

Question 14

Resistance

Answer 14

change in pressure/flow = 8(viscosity)(length of tube)/ ttr4

Question 15

Capillary fluid exchange

Answer 15

Kf[(Pc-Pi)-(ttc-tti)

Question 16

Renal clearance

Answer 16

C= UxC/Px

Question 17

Glomerular filtration rate (2 equations)

Answer 17

GFR= UinulinxV/ Pinulin

GFR= Kf [(Pgc-Pbs)-(ttgc-ttbs)]

Question 18

Effective renal plasma flow

Answer 18

UpahxV/ Ppah

Question 19

Renal blood flow

Answer 19

RPF/1-Hcrt

Question 20

Filtration fraction

Answer 20

GFR/RPF

Question 21

Physiologic dead space

Answer 21

Vd= Vt x PaCO2-PeCO2/PaCO2

Question 22

Pulmonary vascular resistance

Answer 22

Ppulm artery- Pleft atrium/ CO

Question 23

Alveolar gas equation

Answer 23

PAO2= PIO2 - PaCO2/R

Question 24

Relative risk reduction

Answer 24

RRR= 1 - RR