4 Acid base and ABG

Question 0

Normal pCO2

Answer 0

40mm HG

Question 1

Normal blood pH

Answer 1

7.4

Question 2

Normal HCO3-

Answer 2

24 mmol/L

Question 3

How to test for acidosis/alkylosis and respiratory or metabolic

Answer 3

1) pH (acidosis or alkylosis)
2) Is the primary disorder metabolic vs. respiratory
3) Calculate expected compensation
4) Calculate Anion gap

Question 4

-pCO2 compensation in metabolic acidosis

Answer 4

-1.5[HCO3-] +8

or Last 2 digits of pH

Question 5

pCO2 compensation in metabolic alkylosis

Answer 5

-0.9[HCO3-] +9

Question 6

Bicarbonate compensation

Answer 6

Bicarbonate compensates in same direction as change in pCO2

Question 7

Bicarb compensation

Answer 7

Respiratory acidosis
*Acute( 1 mmol/L ^bicarb per 10mmHg ^pCO2) (over 40)
*Chronic( 4 mm/L)
Respiratory Alklosis
*Acute ( 2mmol/L v Bicarb per 10mmHg v pCO2)
*Chronic (4mmol/L )

Question 8

Anion gap

Answer 8

[Na] - ([Cl] +[HCO3-]) (should be below 11)