3 - Diagnostics: ABG

Question 1

ABG three components

Answer 1

pH = 7.4

PaCO2 = 40

PaO2 = 100

Question 2

Always give ABG in what order

Answer 2

pH > PCO2 > PO2

Question 3

Allens test

Answer 3

Occlude radial and ulnar arteries to check for perfusion

Question 4

Shortened HH equation

Answer 4

pH (proportional to) HCO3/PaCO2

Question 5

In acute, For every rise of 10 in pCO2

Answer 5

pH drops by .08

Question 6

Chronic resp.

PaCO2 increase by 10

Answer 6

pH decreases by .03

Question 7

Room air FiO2

Answer 7

21%

Question 8

PaO2

Answer 8

Dissolved arterial oxygen

Question 9

spO2

Answer 9

Oxygen saturation (on Hb)

Question 10

SaO2

Answer 10

saturation via chem lab (instead of finger probe)

Question 11

PiO2

Answer 11

Pressure inspired oxygen in trachea

Question 12

Alveolar oxygen - arterial oxygen

Answer 12

A-a gradient

Question 13

A-a gradient eq

Answer 13

PiO2 - (PaCO2) - PaO2

Question 14

Normal A-a gradient

Answer 14

Age/4 + 4

Question 15

SpO2 vs PaO2 curve

Answer 15

Sigmoidal bc of positive cooperativity of hemoglobin

Question 16

Left shifting things

Answer 16

Alkalosis

Hypothermia

Low PCO2

Low 2,3DPG

CO poisoning

Question 17

Expected PaO2 should be roughly

Answer 17

5x your FiO2

Question 18

Wht happens as seeverity of diffusion impairment increases

Answer 18

The ratio of PaO2 to FiO2 decreases

Question 19

SG cath try to get where?

Answer 19

zone 3, best representation of ___

Question 20

Increasing FiO2 does not..

Answer 20

fully correct hypoxia caused by pure shunt