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Flashcards in Lung Volumes Deck (22):
1

Inspiratory Reserve Volume (IRV)

The volume of air you breathe in after (on top of/in addition to) the tidal volume

2

Expiratory Reserve Volume (ERV)

-The volume of air you can force out in addition to the VT
-Requires activation of expiratory muscles (active expiration)

3

Residual volume

-No matter how hard you try, you cannot voluntarily force the air
-"Having the wind knocked out of you"-something forced you to exhale into RV

4

The Respiratory Capacities
-What is a capacity?
-How many are there?

-A capacity is the sum of two or more of the respiratory volumes
-There are four capacities

5

The Respiratory Capacities
-Influenced by?
-Absolute volume compared to % of predicted?
-% predicted based on?

-Size, gender, and age
-Absolute volume is less important than % of predicted
-% predicted is based on population norms and regression analysis

6

Vital capacity

-Inhale as deeply as you can then exhale all the air that you can (force it out at the end)
-VC = IRV + VT + ERV

7

Vital capacity
-Does not include residual volume allows VC to be measured via?

Spirometry

8

Inspiratory capacity

-Inhale as deeply as you can
-The total volume of air you can inhale from a normal resting point
-IC = IRV + VT
-Does not include RV-can be measured using spirometry

9

What volume cannot be measured using spirometry?

Residual volume

10

Functional Residual Capacity

-All the air that remains in your lungs at the end of a normal (passive) respiration
-FRC = ERV + RV
-INCLUDES RV so it CANNOT be measured using spirometry

11

Total Lung Capacity

-The total volume of air in your lungs after a maximal inhalation
-TLC = ERV + RV + IRV + VT
-INCLUDES RV-CANNOT be measured using spirometry

12

VC (vital capacity) equation?

VC = ERV + IRV + VT

13

IC (inspiratory capacity) equation?

IC = IRV + VT

14

FRC (functional residual capacity) equation?

FRC = ERV + RV

15

TLC (total lung capacity) equation?

TLC = ERV + IRV + VT + RV

16

3 types of dead space?

-Anatomic
-Alveolar
-Physiologic

17

Anatomic Dead Space

This is the conducting airways that were never meant to exchange O2 and CO2

18

Alveolar Dead Space

-Alveoli that get air, but do not get blood
-No exchange occurs here (because there is no blood to exchange with)
-As a result, the work it took to get the air into these alveoli is wasted

19

Physiologic Dead Space

The sum of anatomic and alveolar dead space

20

Reading assignments Respiratory physiology West
-Ch 2 pgs. 13-15 (FIG 2-2 especially), pgs. 15-16, pgs. 19-21

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21

You wish to measure a patients tidal volume. What instructions do you give the patient?

Breathe normally

22

The Respiratory Volumes
-Tidal volume (VT)-definition?
-Varies with circumstances such as?

-Amount of air inspired (or expired) in a single breath
-Varies with circumstances-resting versus exercise