optimal
## Ideal Body Weight (IBW) - Calculation Explained

[Music]

in the last lesson on arts management i

mentioned about using ideal body weight

or ibw when we're setting our title

volume goals in this quick lesson here i

just wanted to review over exactly what

this was so our ideal body weight which

is also something referred to as

predicted body weight or pbw that this

is as the name suggests the ideal or

expected weight for someone given their

height and gender so the concept was

initially introduced by ben devine in

1974. now the ideal body weight may and

often does differ from the patient's

actual or total body weight when we

actually weigh them especially in the

united states as well as many other

places around the world the average

person is actually larger than what we

would expect and so a patient's

composition of that and muscle has a

different influence based on the

proportions of each it was found that

some medications metabolism was related

more to a person's ideal body weight

than their actual body weight in

addition men when we're comparing them

to women of the same height are

generally a little bit larger so this is

something that we also have to account

for and then in the context of the last

lesson on ards a person's lung size

doesn't change despite their total body

weight so for two people of the same

height but different weights we would

actually expect their lungs to be

approximately the same size so what this

means especially for our lung protective

ventilation as well as the use of some

medications that we need to calculate

our patients ideal body weight and then

use that number instead to ensure safety

for them so let's go and talk about how

it is that we calculate it now there's

actually many different methods to

calculating this but the most popular

one is actually the divine formula for

adults so we have two different slightly

different calculations for both men and

women so for men we're going to start

with 50 kilograms or 110 pounds to that

we're going to add 0.9 kilograms or 2

pounds times their height in centimeters

minus 152.

for women we're basically just beginning

with a slightly different starting

number so we're going to begin with 45.5

kilograms or 100 pounds again plus 0.9

kilograms or 2 pounds times their height

minus 152. now fortunately we actually

have charts of these calculated out so

you don't actually have to do this

calculation as well as most charting

systems will automatically determine

what our patient's idle body weight is

but it is helpful to kind of understand

how we got to these numbers so let's go

through just a couple of quick examples

here just to help cement the calculation

in here so first we're going to take a

man who is six foot tall and figure out

what his ideal body weight would be so

six foot is equal to 72 inches which is

equal to 182 centimeters so if we're

working with kilograms here we'll take

50 kilograms plus 0.9 times 182 minus

152 or if we're working in pounds we do

110 plus 2 times the difference of 182

minus 152 so we know here in kilograms

we would be doing 0.9 times 30 which

gives us 50 plus 27 which equals 77

kilograms this would be our ideal body

weight if we were continuing in pounds

we'd have 110 plus 2 times 30 which

equals 110 plus 60 giving us 170 pounds

of ideal body weight and then next let's

take a woman who is 5 foot 5 inches so 5

foot 5 inches is 65 inches which equals

165 centimeters so here we're going to

be starting with a different beginning

number so we're going to take 45.5

kilograms plus 0.9 kilograms times 165

minus 152. in pounds that would be a

hundred pounds plus two times 165 minus

152. so we know that difference is 13 so

on the kilogram side we'd have 45.5

plus 0.9 times 13 which gives us 11.7

adding that to 45.5 gives us 57.2

kilograms of ideal body weight again if

we're doing this in pounds we'd have 100

pounds plus 2 times 13 which gives us

100 pounds plus 26 or 126 pounds of

ideal body weight so again pretty easy

calculation and oftentimes we'll just

plug in what their height is and we've

already got it figured out what their

actual ideal body weight is but

hopefully you guys kind of understand

why it is that this would be an

important thing especially when we're

doing the lung protective ventilation

for arts pretty simple lesson hope you

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