Respiratory Therapy Equations – Flashcards
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Oxygen Extraction Ratio
answer
O2ER= CaO2-CvO2/ CaO2
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Hb Saturation
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SaO2= [Hbo2/Total Hb] x100
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A-a Oxygen Tension Gradient
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P (A-a) O2= PAO2-PaO2
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Oxygen Content of Arterial Blood
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CaO2= (Hbx 1.34x SaO2) + (PaO2 x 0.003)
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Oxygen Content of Mixed Venous Blood
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CvO2= (Hb x 1.34 x SvO2) + (PvO2 x 0.003)
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Oxygen Content of Pulmonary Capillary Blood
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CcO2= (Hb x 1.34X SaO2) + (PaO2 x 0.003)
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Total Oxygen Delivery
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DO2= QT (CaO2 x 10)
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Pulmonary Shunt Fraction
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Qs/Qt= CcO2-CaO2/CcO2- CvO2
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Arterial- Venous Oxygen Content Difference
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C(a-v) O2 = CaO2- CvO2
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Farenheight to Celsius
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F-32= 1.8 (C)
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Kelvin
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K= C+273
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Boyle's Law
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P1 x V1= P2 x V2
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Charles' Law
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V1/T1= V2/T2
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Guy-Lussac's
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P1/T1= P2/T2
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Combined Gas Law
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(P1x V1)/ T1= (P2 x V2)/ T2
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Minute Ventilation
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Vt (tidal volume) x RR (respiratory rate)
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Ideal Body Weight
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Male: 106 +6 (Height in inches -60) Female: 105 +5 (Height in inches - 60)
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Duration of Flow (min)
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Duration of Flow (min)= Pressure (psig) x cylinder factor/ Flow (L/min)
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Amount of Gas in Cylinder
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Liquid O2= weight(lb) x 860/ 2.5 lb/L
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Duration of Gas (min)
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Amount of Gas in Cylinder(L)/ Flow (L/min)
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%O2
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(Air Flow x 21) + (O2 Flow x 100)/ Total Flow
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Cylinder Factor (L/psig)
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Cubic Feet (full cylinder) x 28.3/ Pressure(full cylinder) in psig
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Shunt Equation w. or w/o CPAP
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Qs/Qt= CcO2-CaO2/5+CcO2- CvO2
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Shunt Equation w. or w/o PEEP
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Qs/Qt= CcO2-CaO2/3.5+CcO2- CvO2
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Shunt Equation : Modified
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Qs/Qt= (PAO2- PaO2) x 0.003/(CaO2- CvO2)+ (PAO2-PaO2) x 0.003
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Anion Gap
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Agap =Na+ -(Cl- +HCO3-)
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Arterial/Alveolar Oxygen Tension (a/A) Ratio
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a/A = PaO2 /PAO2
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Arterial-Mixed Venous Oxygen Content Difference
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[C (a - v) O2]
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amount of O2 dissolved in 100mL
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PaO2 x 0.003
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