Pulmonary Tests

Question 1

pulmonary function tests

Answer 1

• maximal effort flow volume loop
• peak expiratory flow
• forced vital capacity
• indicates pulmonary compliance

Question 2

maximal expiratory flow volume curves

Answer 2

• maximal flow that can be attained at each lung volume
• greater at greater lung volume because airways are distended and resistance is lower
• no balloon-used for obstructive and restrictive disease
• effort independent
• recorded with spirometer that measures flow and volume during a breathing cycle
• can be constructed from IVPF curves by taking points from plateau
• if lung elastic recoil pressure is abnormally low, maximal expiratory flow rate is low

Question 3

flow volume loop

Answer 3

flow and volume recorded simultaneously with spirometer during forceful rapid expiration after maximal inspiration

• normal vital capacity around 4.75 L
• peak expiratory flow at 75% VC, and 100% VC exhaled over 1 sec

Question 4

FVC

Answer 4

forced vital capacity

-4.75

Question 5

FEV.5

Answer 5

forced expired volume in 05 sec

Question 6

FEV1

Answer 6

forced expired volume in 1 sec

should be 100 %

Question 7

FEV 3

Answer 7

3 sec

Question 8

PEF

Answer 8

peak expiratory flow

-75% VC

Question 9

FEF 25-75

Answer 9

-forced expired flow between 25-75% of the expired volume

Question 10

FEF 50

Answer 10

-forced expired flow at 50% of expired volume

Question 11

MEFV loops in obstructive and restrictive lung disease

Answer 11

• bigger in obstructive
• smaller in restrictive
• emphysema curves down