Equations

Question 1

Cerebral perfusion pressure

Answer 1

=MAP - Intracranial cerebral pressure

Question 2

MAP

Answer 2

1/3 systolic + 2/3 diastolic

Question 3

Free water deficit

Answer 3

4 mL x weight (kg) x desired change in serum Na (meq/L)

Question 4

Nitrogen intake

Answer 4

protein intake (g/day) x 0.16

Question 5

Nitrogen balance

Answer 5

Nitrogen intake - Nitrogen lost

Question 6

Polycythemia volume to be exchanged

Answer 6

[(observed Hct.- desired Hct (usually 55-60%) / observed Hct ] x infant’s blood volume (mL)
(blood volume = weight in kg x 80-100 mL/kg

Question 7

Hardy Weinberg principle

Answer 7

p+q = 1

p2 +2pq + q2 = 1