ACCS Kettering Questions With Complete Solutions Alveolar Oxygen Tension (PAO2)/Alveolar Air Equation correct answer: Shortcut: (Fio2 x 7) -Paco2 +10
VD/VT and ratio correct answer: Paco2-Peco2/Paco2 Make it a
ratio by multiply answer by 100. 20-40% (up to 60% for vent pts)
Alveolar Minute Ventilation correct answer: (VT-VD) x f
Anatomic deadspace correct answer: 1ml per 1lb body weight
Work of breathing correct answer: change in Pressure X change
in Volume .5-.7 J/L (.05-.07 kg-m/l) Alveolar-Arterial Oxygen Gradient (P(A-a)O2 or AaDo2 or A-a Gradient correct answer: PAO2-PaO2 Normal:25-65 torr on 100% o2 V/Q mismatch: 66-300 torr Shunting:>300 torr
Arterial Oxygen Content (CaO2) correct answer: Never have to
calculate on test. If all values are good just pick normal 17-20% (high teens). If all values are bad pick the answer in low teens Mixed Venous Oxygen Content (CvO2) and SvO2 correct
answer: Reflect cardiac output. Cvo2 and SvO2 will decrease
with the cardiac output. Cvo2: 12-16%. SvO2: 65-75% 1 / 2
Arterial-Venous Oxygen Content Difference (C(a-v)O2) correct
answer: CaO2-CvO2. Will rise when cardiac output is falling.
4-5%.Shunt Equation (QS/QT) correct answer: Shortcut: When A- aDO2 goes up by 100 add 5% starting at 5%. Example 300=20%. Normal is 3-5%
PaO2 to SaO2 relation correct answer: PaO2+30= SaO2
P/F Ratio correct answer: PaO2/FiO2 380 torr or greater
ATS/ERS Criteria (old school) correct answer: ALI: <300.ARDS P/F Ratio <200, PCWP <18mmhg, diffuse bilateral infiltrates Berlin Criteria (New school) correct answer: Mild ARDS: P/F ratio <200-300 Moderate ARDS: P/F ratio <100-200 Sever ARDS:P/F Ratio <100 Diffuse bilateral opacities
Cardiac output correct answer: 4-8 L/min
Cardiac index correct answer: 2-4 L/min. half cardiac output
Pulmonary Artery Pressure (PAP) correct answer: 25/8
(14)mmhg
Right Atrium pressure correct answer: 2-6 mmhg or 4-12
cmh2o
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