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Flashcards in Physiological Consequences of Increased Movement of Fluid Deck (17)
1

What is the pulmonary arterial pressure?

15mmHg

2

What is the pulmonary capillary pressure?

12-8 mmHg

3

What is the pulmonary capillary volume at rest?

60-80mL

4

Why does pulmonary arterial pressure not increase as cardiac output increases?

Because of dilation of pulmonary vessels and also possible recruitment of vessels that are normally not being perfused

5

What is the change in systemic blood pressure with respiration relative to?

The size of the negative intrapleural pressure

6

What causes kerley B lines on a CXR?

dilated lymphatics

7

What does low PaCO2 in blood gases indicate with low pH?

Metabolic acidosis - CO2 is low due to compensatory hyperventilation in attempt to increase pH

8

What causes metabolic acidosis in heart failure?

Tissues undergoing anaerobic metabolism generating acid because they are hypoxic

9

What causes low bicarbonate in metabolic acidosis?

Either bicarbonate is being lost for a reason (such as diarrhoea) or it is being consumed to act as a buffer for an acid (such as lactic acid in hypoxia or ketoacid if diabetic etc.)

10

What is the normal concentration of HCO3-?

22 to 28 mmol/L

11

What does low PaCO2 in blood gases indicate with high pH?

respiratory alkalosis

12

What are the causes of pulmonary oedema?

Increase in hydrostatic pressure or increased vascular permeability

13

What are the mechanical changes that occur in pulmonary oedema?

decrease in lung complicance, decrease in lung volume, increase in airway resistance, increased work of breathing (both elastic and resistive)

14

What are the blood gasses in pulmonary oedema?

low PaO2, low PaCO2, high pH - due to compensatory hyperventilation

15

What are the blood gasses in severe pulmonary oedema?

low PaO2, high PaCO2, low pH - if in metabolic and respiratory acidosis - fatigue so can no longer hyperventilate

16

What is the result of interstitial oedema in the lung?

Increased WOB without impaired gas exchange

17

What are aggravating factors of pulmonary oedema?

Reduced lymphatic drainage and low osmotic pressure