Equations Flashcards

1
Q

What is the alveolar gas equation?

A

PAO2 = PIO2 – (PaCO2 * 1.2)

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2
Q

What is the equation for air inspired when breathing at KU?

A

PIO2 = (PB-47)*0.21 = 147 mm Hg

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3
Q

What is the equation for total blood O2 content?

A

Hb *1.34 * % saturation + (0.003*PO2)

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4
Q

What is the equation for Dead Space/Tidal volume?

A

(PaCO2 – PECO2) / PaCO2

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5
Q

What is the equation for compliance?

A

∆ Lung volume /∆PTP

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6
Q

What is the equation for airway resistance?

A

(PB - PALV) / airflow

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7
Q

What is the equation for O2 saturation of Hb (%)?

A

O2 saturation of Hb (%) = [(HbO2,ml/dl / (Hb, g/dl * 1.34 ml/g)] x 100

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8
Q

What is the equation for blood O2 content?

A

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]

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9
Q

Calculate and insert the remaining values

A
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10
Q

What is the equation for VO2?

A

VO2 = Q * C(a-v) O2

Q, cardiac output

C (a-v) O2, difference in arterial and venous O2 content

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13
Q

What is the equation for oxygen extraction ratio (O2ER)?

A

O2ER- C (a-v) O2/ CaO2

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14
Q

What is the equation for the pressure produced by a single gas?

A
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15
Q

Find the partial pressures of gases a and b given that the Ptotal is 100 mm Hg; a, n=6 and b, n=14.

A
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17
Q

What is the equation for the diffusion of a substance across a membrane?

A
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18
Q

What is the equation for difussion capacity?

A
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20
Q

What is the alveolar gas equation?

A

PAO2 = PIO2 - (PACO2 * 1.2)

23
Q

How does increasing (PAO2- P capil) O2 effect O2 flux?

A

Increases flux

24
Q

What is PO2?

A

Partial pressure of O2 in a system

25
Q

What is PIO2?

A

The partial pressure of O2 in inspirated air

26
Q

What is PAO2?

A

That partial pressure of alveolar O2

27
Q

What is PaO2?

A

Partial pressure of arterial oxygen

28
Q

What is PvO2?

A

Partial pressure of venous O2

29
Q

What is FACO2?

A

The fraction of CO2 in alveoli

30
Q

What is VE?

A

Volume exhaled into the spirometer