CALCULATIONS PIO2 = PB – 47 x FIO2 667 47 620 x .21 130.2 - PAO2 = PIO2 – PaCO2 x 1.2* * If FIO2< 60% otherwise use 1.0 - a/A PO2 = PaO2 PAO2 a/A PO2 = 130.2 mmHg 48.0 mmHg (40.0 x 1.2) 82.2 mmHg (PAO2) 75 mmHg normal PaO2 (Amarillo) 82.2 mmHg (Amarillo) A-a PO2 = PAO2 - PaO2 - VD physiologic mmHg (PB) mmHg (water vapor) mmHg FIO2 mmHg (PIO2) 82.2 75 7.2 mmHg mmHg mmHg a/A PO2 = 0.91 (PAO2) (PaO2) (A-a PO2 gradient) VDphysiologic = PaCO2 - PECO2 x VE PaCO2 VD PaCO2 - PECO2 = VT PaCO2 VDphysiologic = 40 - 27 x 500 40 VD 40 - 27 = VT 40 VD = 0.325 VT VDphysiologic = 0.3.25 x 500 VDphysiologic = 162.5 ml VD anatomic VDanatomic = FACO2 - FECO2 x VE FACO2 VDanatomic = 6.45% - 4.35% x 500 6.45% VDanatomic = .325 x 500 VDanatomic = 162.5 ml R respiratory exchange ratio R= VCO 2 2 VO R= 200 ml 250 ml R = 0.8 VE (or VT) x f = V (V E) 500 ml x 14 bpm = 7000 ml or 7 L VA x f = V A 350 ml x 14 bpm = 4900 ml or 4.9 L VD x f = V D 150 ml x 14 bpm = 2100 ml or 2.1 L V = V D + V A 7 L = 2.1 L + 4.9 L DLCO x 1.23 = DLO2 36 ml/min/mmHg (CO) x 1.23 = 44.28 ml/min/mmHg (O2)
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