Equations Flashcards
What is the alveolar gas equation?
PAO2 = PIO2 – (PaCO2 * 1.2)
What is the equation for air inspired when breathing at KU?
PIO2 = (PB-47)*0.21 = 147 mm Hg
What is the equation for total blood O2 content?
Hb *1.34 * % saturation + (0.003*PO2)
What is the equation for Dead Space/Tidal volume?
(PaCO2 – PECO2) / PaCO2
What is the equation for compliance?
∆ Lung volume /∆PTP
What is the equation for airway resistance?
(PB - PALV) / airflow
What is the equation for O2 saturation of Hb (%)?
O2 saturation of Hb (%) = [(HbO2,ml/dl / (Hb, g/dl * 1.34 ml/g)] x 100
What is the equation for blood O2 content?
Blood [O2] content, ml/dl = [0.003 ml/(mmHg x dl) x PO2 (mmHg)] + [Hb] g/dl x 1.34 ml/g x % O2 sat]
Calculate and insert the remaining values
What is the equation for VO2?
VO2 = Q * C(a-v) O2
Q, cardiac output
C (a-v) O2, difference in arterial and venous O2 content
What is the equation for oxygen extraction ratio (O2ER)?
O2ER- C (a-v) O2/ CaO2
What is the equation for the pressure produced by a single gas?
Find the partial pressures of gases a and b given that the Ptotal is 100 mm Hg; a, n=6 and b, n=14.
What is the equation for the diffusion of a substance across a membrane?
What is the equation for difussion capacity?
What is the alveolar gas equation?
PAO2 = PIO2 - (PACO2 * 1.2)
How does increasing (PAO2- P capil) O2 effect O2 flux?
Increases flux
What is PO2?
Partial pressure of O2 in a system
What is PIO2?
The partial pressure of O2 in inspirated air
What is PAO2?
That partial pressure of alveolar O2
What is PaO2?
Partial pressure of arterial oxygen
What is PvO2?
Partial pressure of venous O2
What is FACO2?
The fraction of CO2 in alveoli
What is VE?
Volume exhaled into the spirometer
