Numbers

Question 1

PVR formula

Answer 1

PVR = 80*(PAP – PCWP)/CO, normal 100-200 dyn-s/cm5

Question 2

SVR formula

Answer 2

SVR = 80*(MAP – CVP)/CO, normal 900-1200 dyn-s/cm5

Question 3

Normal PA systolic is what % of SBP

Answer 3

Note that normal PA_systolic is 1/8th systemic SBP, and that pulmonary hypertension is defined as PA_systolic is > 1/4 systemic.

Question 4

Normal PVR value

Answer 4

100-200 dyn-s/cm5

Question 5

Normal SVR value

Answer 5

900-1200 dyn-s/cm5

Question 6

height and bp change

Answer 6

0.7mm Hg for every centimeter cuff is above or below the heart

Question 7

Normal cardiac output adult

Answer 7

4-6.5 ml/min

Question 8

Alveolar gas equation

Answer 8

pAO2 = FiO2 (Patm – pH20) – (paCO2/RER)

pAO2 = (FiO2 x 713 mmHg) – (paCO2/0.8)

Question 9

normal ICP values

Answer 9

normal at rest 5-15
intracranial hypertension 25-40
threshold of death 60
brain death 80

Question 10

goal CPP in TBI

Answer 10

60

Question 11

dibucaine number

Answer 11

percentage that dibucaine inhibits the hydrolysis of benzoylcholine by pseudocholinesterae
normal = 80%
homozygous atypical 20%
heterozygous 40-60%

Question 12

stump pressure threshhold

Answer 12

less than 50 ass’d with hypoperfusion

Question 13

PFT results predict increased risk postop mech vent

Answer 13

FEV < 2L total
maximum breathing capacity <50% predicted
MMEFR <50% predicted (maximal mid expiratory flow rate)

Question 14

extubation criteria in ICU

Answer 14

HD stable

complete reversal nmb

vital capacity >10 mL/kg
tidal volume >6 mL/kg
NIF >20cm H2O
PaO2 >60 with FiO2 <50%
PaCO2<50 mmHg
RR <30

normothermia

adequate pain control

leak test (auscultate breath sounds with cuff down and spont breathing)

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