CO2 Ventilatory Response Curve Flashcards Preview

Apex 1 - 2 Respiratory II: Physiology (24) > CO2 Ventilatory Response Curve > Flashcards

Flashcards in CO2 Ventilatory Response Curve Deck (22)
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1

The CO2 response curve describes the relationship between PaCO2 and

minute ventilation

2

Chemoreceptors in which areas monitor PaCO2?

Medulla (central)

Carotid bodies

Transverse aortic arch (peripheral)

3

Where are central PaCO2 chemoreceptors located?

Medulla

4

Where are peripheral PaCO2 chemoreceptors located?

Transverse aortic arch

5

Which part of the CO2 Ventilatory Response curve represents the sensitivity of the entire respiratory apparatus to PaC02?

Slope

6

Minute ventilation increases with PaC02 in a linear fashion when PaCO2 is between which values?

20 - 80 mmHg,

7

Carbon dioxide is a respiratory depressant when PaCO2 exceeds which values?

80- 100 mmHg

8

What's the MAC of CO2

200 mmHg

9

What are the causes of the left shift of the CO2 Ventilatory Response Curve?

Hypoxemia

Metabolic acidosis

Surgical stimulation

Some CNS etiologies

Some drugs

10

Which CNS etiologies may cause a left shift of the CO2 Ventilatory Response Curve?

Increased ICP

Fear

Anxiety

 

11

Which drugs may cause a left shift of the CO2 Ventilatory Response Curve?

Salicylates

Aminophylline

Doxapram

Norepinephrine

12

What are the causes of Right shift of the CO2 Ventilatory Response Curve?

Metabolic alkalosis

Carotid endarterectomy

Natural sleep

Some drugs

13

Which drugs may cause a right shift of the CO2 Ventilatory Response Curve?

Volatile anesthetics

Opioids

Neuromuscular blockers

14

Opioid antagonists do not affect the CO2 Ventilatory Response Curve:

A. In the presence of opioids

B. In the absence of opioids

In the absence of opioids

15

A left shift and increased slope indicate that

A. Ve is higher than expected for a given  PaC02

B. Ve is lower than expected for a given  PaC02

 

Ve is higher than expected for a given  PaC02

16

A left shift and increased slope indicate that Ve is higher than expected for a given  PaC02. This creates

A. a respiratory acidosis

B. a respiratory alkalosis

a respiratory alkalosis

17

A right shift and decreased slope indicate that

A. Ve is higher than expected for a given PaCO2

B. Ve is lower than expected for a given PaCO2

Ve is lower than expected for a given PaCO2

18

A right shift and decreased slope indicate that Ve is lower than expected for a given PaCO2. This creates

A. a respiratory acidosis

B. a respiratory alkalosis

a respiratory acidosis

19

The  highest PaC02 at  which a person will not breathe is called:

Apneic threshold

20

A left shift implies that the apneic threshold has

A. increased

B. decreased

decreased

21

A right shift implies that the apneic threshold  has

A. increased

B. decreased

 

increased

22

References:

Barash. Clinical Anesthesia. 8th edition. 2017 p. 370-3 71.

Nagelhout. Nurse Anesthesia. 6th ed. 2018. p. 579 -581.