ACCS Kettering questions with correct answers

Alveolar Oxygen Tension (PAO2)/Alveolar Air Equation Answer Shortcut: (Fio2 x 7) -Paco2 +10 VD/VT and ratio Answer Paco2-Peco2/Paco2 Make it a ratio by multiply answer by 100. 20-40% (up to 60% for vent pts) Alveolar Minute Ventilation Answer (VT-VD) x f Anatomic deadspace Answer 1ml per 1lb body weight Work of breathing 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 Answer PAO2-PaO2 Normal:25-65 torr on 100% o2 V/Q mismatch: 66-300 torr Shunting:300 torr Arterial Oxygen Content (CaO2) 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 Answer Reflect cardiac output. Cvo2 and SvO2 will decrease with the card