Calculations

Question 1

Effective osmolarity

Answer 1

2Na + glucose

NB remember units!!!!

Also

2Na+k+glucose

Question 2

RER

Answer 2

(BW(kg) x 30)+ 70
Can use the above for patients weighing 2-20kg

RER= 70 x [(bodyweight in kg) to the power of 0.75]

Question 3

What is the equation for Urea reduction ratio

Answer 3

Urea reduction ratio

URR= (BUN pre-BUN post) / BUN pre

Question 4

Pouseuille equation

Answer 4

Q (flow) = (deltaP x pi x r4th power)/ 8uL

Question 5

What is the plasma volume calculation for dogs?

Answer 5

Plasma volume calculation (ml) =(1-hct) x BW(kg) x 85ml/kg

Question 6

What is the plasma volume distribution for cats?

Answer 6

Plasma volume calculation (ml) =(1-hct) x BW(kg) x 55ml/kg

Question 7

What is the calculation for ROX index

Answer 7

SP02 /fio2/RR

For fio2 (fio2/100!!!)

> 4.88? Better prognosis check paper

Question 8

Calculation of sodium deficit

Answer 8

Na Def = (target Na-patient Na) x (0.6 x bodyweight in kg)

Question 9

Calculation of free water deficit

Answer 9

=[(current Na/ normal Na) -1] x0.6 x bodyweight in kg