Calculation / Formulas

Question 1

Parkland Formula

Answer 1

4mL x %BSA x weight in kg = Total fluid in first 24hr

Give 1/2 over FIRST 8 hr

Remaining over next 16hr

Urine output .5mL/kg/hr

Question 2

Consensus Burn Formula

Answer 2

2 - 4 mL x %BSA x weight in kg = fluid given in first 24hrs

1/2 given over the first 8hr

Remaining given over next 16hrs

2mL/kg Adults

3mL/kg Peds

4mL/kg electrical burns

Question 3

Ventilator IBW Calculation

(For Male Pt)

Answer 3

Male = 50 + 2.3kg per inch > 60 = IBW

IBW x 6mL/kg = Vt

Question 4

Pediatric Resescutation 4/2/1 Rule

Answer 4

Use the Parkland Formula plus MAINTENANCE fluid

In 1 hour pt needs to get

4mL/kg for the first 10kg of body weight (0-10)

2mL/kg for the 2nd 10kg of body weight (10-20)

1mL/kg for remaining weight (> 20kg)

= mL/hr additional fluid

Question 5

100-50-20 Daily Fluid Maintenance

Answer 5

In one day a person needs:

100 mL/kg for first 10kg

50 mL/kg for 2nd 10kg

20 mL/kg for remaining weight > 20kg

Remember to divide by 24 to get hourly rate

Question 6

ET Tube Size Formula

Answer 6

1 y/o and older = 16 + age in years divided by 4 = ET size

or

Age in years divided by 4 + 4 = ET size

Preterm/fullterm = postconceptual age in weeks divided by 10

Question 7

ET Tube Depth

Answer 7

Suggested “lip to tip” 3 x tube size (oral)

4 x tube size (nasal)

or

Age in years divided by 2 + 12 = depth

Question 8

Cerebral Perfusion Pressure (CPP)

Calculation

Answer 8

MAP - ICP = CCP

CCP < 70 is associated with poor outcome brain injury

Systemic MAP is 60 - 180 mmHg

Question 9

Mean Arterial Pressure (MAP)

Calculation

Answer 9

Diastolic B/P x 2 + Systolic B/P / 3

Question 10

Medication Injection Calculation

(mL to give)

Answer 10

Give divided by Have x mL in vial = mL you will give

Question 11

Vital Capicity =

Answer 11

IRV + ERV + Vt = vital capicity

Question 12

Minute Ventilation (Ve) =

Answer 12

Ve = Vt x RR = mL/min

Question 13

Anion Gap Calculation

Answer 13

(Na+ + K+) - (Cl + HCO3) = Anion Gap

Normal 12 (+/-4)

Question 14

Golden Rule for pH Changes

Answer 14

For every change in PaCO2 of 10 the pH moves 0.08 units in the Opposite direction.

For every change in HCO3 of 10, the pH moves .15 units in the Same direction.

For every decrease in pH of 0.1, the K+ changes 0.6 in the Opposite direction

Question 15

Ventilator IBW Calculation

(For Female Pt)

Answer 15

Female = 45.5 + 2.3kg per inch > 60 = IBW

IBW x 6mL/kg = Vt

Question 16

Medication Infusion Formula

mL/hr

Answer 16

Dose x weight x 60 / concentration

Ex Dopamine - 10mcg/kg/hr

Pt weighs 80kg

10x80x60 = 48,000 / 1600 (concentration)

= 30mL/hr

Question 17

Adjusted FiO2 Formula

Answer 17

Initial FiO2 x Initial barometric Pressure

divided by

Barometric Pressure at Cruising Altitude

Ex initial FiO2 = .70 at sea level (760mmHg) and cruising altitude will be 6,000ft (600mmHg) =

.70x760 / 600 = .88 % (adjusted FiO2)