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Flashcards in Ventilation Deck (16):
1

VD

anatomical dead space

all the space between the nose-mouth and the gas-exchanging surfaces of the alveoli

2

alveolar ventilation

VA - the amount of oxygen that reaches the alveoli to participate in gas exchange

3

Will there be a larger increase in alveolar ventilation if minute ventilation is increase by tidal volume or frequency?

tidal volume

4

causees of alveolar dead space

hydrostatic failure of alveolar perfusion

pulmonary embolus

ventilation of non-vascular air space

obstruction of pulmonary circulation by external forces

5

physiologic dead space

total volume of inhaled gas that does not participate in gas exchange

sum of anatomic and alveolar dead spaces

6

respiratory quotient (state normal)

VCO2/VO2

the ratio of inspired and expired O2 molecules

normally a value of 0.8

7

majro differences between alveolar air and ambient air

water vapor saturation of alveolar air at body temp

presence of significant amount of CO2 in alveolar air

8

alveolar gas equation

PAO2 = PIO2 - (PACO2/RQ)

9

normal PAO2 values

80-100 mmHg

10

normal PACO2 and clinical range

textbook normal - 40 mmHg

clinical range - 35-45 mmHg

11

describe the relationship between alveolar ventilation and PACO2

hyperbolic, exact shape dependso n level of metabolic carbon dioxide production

12

hyperventilation

greater alveolar ventilation than needed to maintain normal PCO2

13

hypoventilation

lower ventilation than necessary to maintain normal PCO2

14

hyperpnea

the ventilatory response for when metabolic rate increases and there is an increase in alveolar ventilation that is appropriate to maintain a constant level of arterial PCO2

15

hypopnea

the compensatory decrease in alveolar ventilation to maintain PaCO2 when metabolism decreases

16

Describe the relationship between alveolar ventilation and PAO2.

have to account for the oxygen in the inspired gas

alveolar PO2 hyperbolically increases, asymptotically approaching the inspired PO2