Equations

Question 1

Cockcroft-Gault Equation

Answer 1

GFR= [(140-age)(wt)(0.85)] / (72xCr)

Question 2

Calvert dosing (carbo dosing)

Answer 2

Dose= AUC (GFR+25)

Question 3

Calculate SVR

Answer 3

SVR= [(MAP-CVP)/CO] x80

CO= SV x HR

Normal = 800-1200

Question 4

Calcium correction for albumin

Answer 4

Corrected Ca mg/dL = Measured Ca + (0.8* (4 - measured Alb))

Question 5

Definition of ARDS

Answer 5

Berlin Criteria:
PaO2/FiO2 <300mmHg

Question 6

Definition of COPD

Answer 6

FEV1/FVC <70

Question 7

Rapid Shallow Breathing Index (RSBI)

Answer 7

RR/TV =

Predicts success in weaning ventilator.

Respiratory Rate (RR) / Tidal Volume (TV)
<105 predicts likely successful weaning
>= 105 predicts likely failure

Question 8

expected change in pH with change of pCO2 of 10

Answer 8

0.08 change in pH

Question 9

FeNa Calculation

Answer 9

[(Urine Na * Plasma Cr) / (Plasma Na * Urine Cr)] x 100

<1% PreRenal
>2% Intrinsic

Question 10

Harris-Benedict Equation

Answer 10

Calculates basal energy expenditure

= 666 + (9.6kg) + (1.7cm) - (4.7*yr)

Kg = weight
cm = height
yr = age

Question 11

Nitrogen balance equation

Answer 11

= (protein intake g/day / 6.25 )- UUN+4

Question 12

Sensitivity Equation

Answer 12

a/a+c

TP/TP+FN

Question 13

Specifity Equation

Answer 13

d/b+d

TN/TN+FP

Question 14

PPV Equation

Answer 14

a/a+b

TP/TP+FP

Question 15

NPV Equation

Answer 15

d/d+c
TN/TN+FN

Question 16

WHO Scoring

Answer 16

Question 17

Equation for power?

Answer 17

Power=1-beta

Reflects the ability of a study to detect an actual effect

Question 18

Equation for confidence level?

Answer 18

Confidence level = 1-alpha

The confidence level equals 100*(1 - alpha)%, or in other words, an alpha of 0.05 indicates a 95 percent confidence level.

Question 19

Equation for attributable risk?

Answer 19

(a/a+b) - (c/c+d)
(Risk of disease or death in an exposed population) - (risk in unexposed population)

A number >0 may indicate exposure increased risk of disease
A number <0 may indicated exposure decreases risk

Question 20

Equation for OR

Answer 20

(a/b)/(c/d)

Question 21

Equation for RR

Answer 21

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