Pulmonary Mechanics Demo

Question 1

Describe how iso-volume pressure-flow (IVPF) curves indicate dynamic compression in health and disease

Answer 1

see pg. 69

it shows that resistance to expiration increases @ low volumes

Question 2

Describe the basis for how pursed lip breathing helps patients with emphysema

Answer 2

Pursed lip breathing (PLB) is the act of exhaling through tightly pressed, pursed lips. If you purse your lips, there is a higher resistance @ the lips. The purpose of PLB is to create back-pressure (cheeks pop out) inside airways which keeps it open during expiration; moving air thus then takes less work.

Question 3

Describe how maximal expiratory flow-volume (MEFV) curves are determined and what information regarding abnormal pulmonary function in obstructive and resistive lung diseases can be obtained from them

Answer 3

MEFV are flow vs volume curves.

See pgs. 76 - 78 for graphs

Question 4

1) volume v pressure curve
2) flow v pressure curve
3) max effort flow volume curve

Answer 4

1) compliance
2) resistance
3) flow vs volume

Question 5

Peak flow is a measure of strength of the

Answer 5

respiratory muscles

The peak expiratory flow (PEF), also called peak expiratory flow rate (PEFR) is a person’s maximum speed of expiration.

Question 6

Vital capacity can indicate the size of the

Answer 6

lung

Question 7

Look @ curves on pg. 79

Answer 7

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