ACCS Kettering, Exam Questions and answers, 100% Accurate. VERIFIED.

ACCS Kettering, Exam Questions and answers, 100% Accurate. VERIFIED. Alveolar Oxygen Tension (PAO2)/Alveolar Air Equation - -Shortcut: (Fio2 x 7) -Paco2 +10 VD/VT and ratio - -Paco2-Peco2/Paco2 Make it a ratio by multiply answer by 100. 20-40% (up to 60% for vent pts) Alveolar Minute Ventilation - -(VT-VD) x f Anatomic deadspace - -1ml per 1lb body weight Work of breathing - -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 - -PAO2-PaO2 Normal:25-65 torr on 100% o2 V/Q mismatch: 66-300 torr Shunting:300 torr Arterial Oxygen Content (CaO2) - -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 - -Reflect cardiac output. Cvo2 and SvO2 will decrease with the cardiac output. Cvo2: 12-16%. SvO2: 65-75% Arterial-Venous Oxygen Content Difference (C(a-v)O2) - -CaO2-CvO2. Will rise when cardiac output is falling. 4-5%. Shunt Equation (QS/QT) - -Shortcut: When A-aDO2 goes up by 100 add 5% starting at 5%. Example 300=20%. Normal is 3-5% PaO2 to SaO2 relation - -PaO2+30= SaO2 P/F Ratio - -PaO2/FiO2 380 torr or greater ATS/ERS Criteria (old school) - -ALI: 300. ARDS P/F Ratio 200, PCWP 18mmhg, diffuse bilateral infiltrates Berlin Criteria (New school) - -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 - -4