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Flashcards in Pulmonary Deck (16):
1

What is vital capacity?

Inspiratory capacity + expiratory reserve volume

2

What is TLC defined?

VC + RV

3

How does vital capacity change in pregnancy?

VC: 20% increase

4

How does total lung capacity change in pregnancy?

TLC: 5% decrease

5

How does functional residual capacity change in pregnancy?

FRC: 20% decrease (expanding uterus and increased abdominal pressure cause chest wall compliance to decrease, so FRC (ERV+RV) decreases

6

How does inspiratory capacity change in pregnancy?

IC: 20% increase

7

How does tidal volume change in pregnancy?

TV: 500->700mL = 40% increase due to respiratory stimulant properties of progesterone

8

How does minute ventilation change in pregnancy?

MV: 7.5->10.5L/min = 40% increase due to increased tidal volume

9

How does alveolar ventialtion change in pregnancy?

Alveolar ventilation: 40% increase

10

How does expiratory reserve volume change in pregnancy in regards to ERV

ERV: 15% decrease

11

How does residual volume change in pregnancy?

RV: 1200->1000mL =15% decrease

12

How does respiratory rate change in pregnancy?

RR: unchanged

13

How does PaCO2 change in pregnancy?

PaCO2: decreases from 40 to 32 mmHg; pH 7.44-mild respiratory alkalosis (CO2 production increases approx 30%, but diffusion capacity increases, and with alveolar hyperventilation, the pCO2 decreases)

14

How is pulmonary hypertension defined in nonpregnant individuals?

Mean pulmonary pressure > 25 mmHg

15

What medications are used for primary pulmonary hypertension?

Diuretics, supplemental oxygen, vasodilator drugs
Choices from 2009 exam: Labetalol, Viagra, Hydralazine, CCB)

16

How do you calculate an A-a gradient?

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