Pulm/Airway

Question 1

difference btwn peak pressure and plateau pressure represents?

Answer 1

Pressure of airway resistance

-pressure needed to overcome resistance to airflow at any given inspiratory flow rate

Question 2

Difference between plateau pressure and zero represents?

Answer 2

Elastic recoil force of lungs and chest wall

Question 3

Plateau pressure itself represents pressure in what entity?

Answer 3

Peak Pressure in alveolus at end of inspiration

Question 4

Mean airway pressure is what?

Answer 4

Average pressure in airway during ventilatory cycle.

Question 5

Mean airway pressure influenced by what variables? (5)

Answer 5

1) peak airway pressure
2) contour of pressure waveform
3) PEEP
4) RR
5) Ti/Ttot (inflation time relative to total time of vent cycle)

Question 6

Estimate Mean Airway pressure on ventilator by what mathematical thing?

Answer 6

Integrating area under curve of airway pressure waveform

Question 7

Normal Mean Airway pressure?
This pressure if airway obstruction?
Mean airway pressure for noncompliant/stiff lungs?

Answer 7

5-10cm H2O
10-20cm H2O
20-30cm H2O

Question 8

Normal MvO2 sat?

Where measured optimally?

Answer 8

• 75%
• measured in pulm artery
• ->with PA cath

Question 9

MvO2 sats high, with what probs?

Answer 9

• carbon monoxide poisoning

- ESPecially cyanide poisoning

Question 10

What’s BAD MvO2?

Question 11

SVC vs IVC MvO2?

Answer 11

72 - SVC
78 - IVC
–brain extracts more O2 than body (Avg 75 in pulm art)