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Thoracic Anesthesia and Respirology > Lung Volumes > Flashcards

Flashcards in Lung Volumes Deck (12):
1

Value of FRC

30 ml/kg

2.3 L in men
1.8 L in women

2

Value of RV

15-20 ml/kg

1.2 L in men
1.1 L in women

3

Value of ERV

15 ml/kg

1.2 L in men
0.7 L in women

4

Value of TV

6 ml/kg

0.5 L in men & women

5

Value of IRV

45 ml/kg

3 L in men
1.9 L in women

6

Value of VC

60-70 ml/kg

4.6 L in men
3.1 L in women

7

Value of TLC

80 ml/kg

5.8 L in men
4.2 L in women

8

FRC = _____ + _____

ERV + RV

9

Define closing capacity.

Closing capacity is the volume at which the small airways close during expiration.

10

At what age does FRC = CC?

66 in standing position
44 in supine position

11

Describe Fowler's method and what it measures.

This is used to measure anatomical dead space.
A patient takes a breath of 100% oxygen to rid the conducting zone gases of nitrogen and then exhales through a mouthpiece capable of analyzing nitrogen concentration at the lips. Initially the exhaled gases contain no nitrogen as this is dead space gas; the nitrogen concentration will increase as the alveolar gases are exhaled. Nitrogen measured following the breath of 100% oxygen must have come only from gas exchanging areas of the lung and not dead space.

12

Name 4 factors which correspond to a decrease in FRC.

a) obesity
b) general anaesthesia
c) supine posture
d) increasing age