Arterial Blood Gases Flashcards Preview

Y1 Respiratory > Arterial Blood Gases > Flashcards

Flashcards in Arterial Blood Gases Deck (17):
1

Physiological pH of the body

7.35 - 7.45

2

Metabolic Acidosis is...

the production of excess H+ by the body due to disease i.e. lactic acidosis, renal failure, sepsis

3

Potential causes of metabolic acidosis

Renal failure

Lactic acid 

Ketones

Drugs

Sepsis

Addisons disease

4

Key features of metabolic acidosis

  1. reduced pH
  2. Tachypnoea with a reduced CO2
  3. A reduced HCO3 (used up by H+)

5

What is Respiratory Acidosis?

An accumulation of CO2 due to disease of the lungs 

The kidneys attempt to counteract this by accumulating bicarbonate

6

Causes of respiratory acidosis

Type 2 respiratory failure

COPD

7

Which conditions may present as respiratory acidosis when nearing exhaustion and respiratory arrest?

Asthma

Pneumonia

Pulmonary Oedema

8

Key features of Respiratory Acidosis

Reduced pH

Increased CO2

Little or no change in bicarbonate

9

Where might raised bicarbonate be seen in respiratory acidosis?

COPD where there is chronic acidosis

10

Metabolic Alkalosis is...

a net loss of acid from the body

11

Causes of metabolic alkalosis

Vomiting

Burns

K+ depletion

Ingestion of base

12

To counteract a surplus of alkali, the body tries to hold onto acid by _______ and retaining CO2

HYPOventilating

13

Key features of metabolic alkalosis

elevated pH

 

marginal increase in CO2 

(relatively poor compensation mechanism)

14

Respiratory Alkalosis is...

a lack of acid because of the loss of CO2. This occurs as a result of hyperventilation

15

Causes of respiratory alkalosis

Stroke

Subarachnoid bleed

Meningitis

Asthma

Anxiety

Altitude

PE

16

Key features of Respiratory Alkalosis

Elevated pH

Hyperventilation

Low CO2

Little change in HCO3

 

17

What is Base Excess?

The amount of strong base which would need to be added or subtracted from a substance in order to return the pH to normal