Ventilation Flashcards Preview

Cardio I - Pulmonary Dysfunction Eval > Ventilation > Flashcards

Flashcards in Ventilation Deck (15)
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1
Q

Definition:

A

Movement of gas through tubes

2
Q

Does ventilation involve gas exchange?

A

NO

3
Q

What happens to the alveoli at the top of the lung at rest?

A

They are more expanded and filled with air

4
Q

Why does most air fill the alveoli in the lower airways (middle-lower lobes) during inspiration?

A

Because the alveoli in the upper airways are inflated @ rest

5
Q

When is air distribution more equal?

A

At higher lung volumes (exercise)

6
Q

What are the dependent airways?

A

The middle and lower lobes of the lungs

7
Q

When do the dependent airways deflate?

A

At low volumes (breathing slowly)

8
Q

Zone 1 (of perfusion and ventilation)

A

No BF
P in alveolus > pulmonary capillary P due to air rising
ABNORMAL

9
Q

Zone 2 (of perfusion and ventilation)

A

Mid lung when seated
Intermittent BF during systole
Limited BF during diastole

10
Q

Zone 3 (of perfusion and ventilation)

A

Lower lung when seated
Continuous BF
Capillary P > alveolar P

11
Q

Which zone is abnormal?

A

Zone 1

12
Q

Minute ventilation

A

VT x RR

13
Q

Normal WOB

A

3-5% of total E expenditure to breathe

14
Q

WOB in disease state

A

25% of caloric expenditure

15
Q

Minute ventilation

A

500mL (VT) x 15 breaths/min = 750mL/min