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Perf Tech > Test 4 > Flashcards

Test 4 Flashcards

1
Q

Which of the following is true as oxygen transfer increases?

A

Arterial PO2 will increase

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2
Q

Which of the following is true as CO2 transfer increases?

A

Arterial PCO2 decreases

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3
Q

Gas Flow = 2.0 L/min and Blood Flow = 4.0 L/min. What is the gas-to-blood flow ratio?

A

0.5:1

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4
Q

Gas Flow = 6.0 L/min and Blood Flow = 4.0 L/min. What is the gas-to-blood flow ratio?

A

1.5:1

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5
Q

changing the GF:BF ratio for a bubble oxygenator

A
  • increase total number of bubbles/ml of blood
  • which increases total surface area of the bubbles resulting in increased oxygen transfer
  • which increases total volume of bubble resulting in increase carbon dioxide transfer
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6
Q

Membrane oxygenators

A
  • changing pressure gradient only effective for oxygen (increase gradient increases O2 transfer)
  • Changing GF:BF changes amount of CO2 being carried (swept) away (increase ratio increases CO2 transfer)
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7
Q

O2 too low

A

increase FiO2 (fraction of inspired)

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8
Q

O2 too high

A

decrease FiO2

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9
Q

CO2 too low

A

decrease GF:BF ratio

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10
Q

CO2 too high

A

increase GF:BF ratio

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11
Q

SvO2 too low

A

increase blood flow

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12
Q

Calculating new GF:BF ratio

A

(Actual PCO2 / Desired PCO2 (which is 40)) x (Ratio that gave you the actual) = New Ratio

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13
Q

PCO2 = 37 mmHg; Ratio = 0.8:1; BF = 5.1 L/min. What is the new gas-to-blood flow ratio?

A

.74:1

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14
Q

Calculating new gas flow

A

New Ratio x Blood Flow = New gas flow

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15
Q

PCO2 = 37 mmHg; Ratio = 0.8:1; BF = 5.1

L/min. What is the new gas flow (no units)?

A

3.8

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16
Q

PCO2 = 60 mmHg; Ratio = 1.1:1; BF = 4.6

L/min. What is the new gas-to-blood flow ratio?

A

1.65:1

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17
Q

PCO2 = 60 mmHg; Ratio = 1.1:1; BF = 4.6

L/min. What is the new gas flow (no units)?

A

7.59

18
Q

what will occur as gas flow is increased into a bubble oxygenator?

A

bubbles produced/min increases

19
Q

what will happent to the SA as the number of bubbles produced per minute is increased in a bubble oxygenator?

A

Gas transfer area is increased

20
Q

What happens to the volume of gas as the number of bubbles produced per minute is increased in a bubble oxygenator?

A

Gas volume is increased

21
Q

as the # of gas bubbles increase in a bubble oxygenator?

A

O2 & CO2 transfer will increase

22
Q

as oxygen transfer decreases the arterial O2 does what

A

Arterial O2 will decrease

23
Q

as carbon dioxide transfer decreases arterial CO2 does what

A

Arterial CO2 will increase

24
Q

as turbulence increases in a membrane oxygenator

A

A. Oxygen transfer will increase
B. Carbon dioxide transfer will increase
C. Potential for cell damage will increase

25
Q

What will increase the gas-to-blood flow ratio

A
  • Decrease blood flow; No change in gas flow

- No change in blood flow; Increase gas flow

26
Q

Gas flow=4 L/min; Blood flow=4 L/min. You increase
your blood flow by 1 L/min and you increase your gas
flow by 500 mls/min. Which of the following best describes the change to the gas-to-blood flow diagram?

A

GF to BF ratio will decrease

27
Q

as the Gas-to-Blood Flow Ratio is decreased in a membrane oxygenator

A

Carbon dioxide transfer decreases

28
Q

On bypass gas results: PaO2 155 mmHg; PaCO2

55 mmHg; pH 7.25; SvO2 75%. Which value do you look at first?

A

SvO2

29
Q

On bypass gas results: PaO2 155 mmHg; PaCO2

55 mmHg; pH 7.25; SvO2 75%. Which value needs to be corrected?

A

PaCO2

30
Q

On bypass gas results: PaO2 155 mmHg; PaCO2

55 mmHg; pH 7.25; SvO2 75%. What do you do?

A

Increase ratio

31
Q

On bypass gas results: PaO2 155 mmHg; PaCO2 55 mmHg; pH 7.25 mmHg; SvO2 75%. Assuming the old
ratio was .5 to 1, what is your new gas to blood flow ratio? (Rounding x.xx for gas component.)

A

0.69:1;.69:1

32
Q

On bypass gas results: PaO2 155 mmHg; PaCO2 55
mmHg; pH 7.25 mmHg; SvO2 75%. Assuming the new
ratio is 0.69:1 and your blood flow is 4.5 liters/minute,
what is your new gas flow? (Rounding x.x) (No Units)

A

3.1

33
Q

On bypass gas results: PaO2 250 mmHg; PaCO2 41 mmHg; pH 7.38; SvO2 65%. Which value needs to be corrected?

A

SvO2

34
Q

On bypass gas results: PaO2 250 mmHg; PaCO2

41 mmHg; pH 7.38; SvO2 65%. What change do you make?

A

Increase blood flow

35
Q

On bypass gas results: PaO2 300 mmHg; PaCO2

41 mmHg; pH 7.38; SvO2 75%. What needs to be corrected?

A

PaO2

36
Q

On bypass gas results: PaO2 300 mmHg; PaCO2
41 mmHg; pH 7.38; SvO2 75%.
What change do you make?

A

Decrease FiO2

37
Q

On bypass gas results: PaO2 200 mmHg; PaCO2
32 mmHg; pH 7.48; SvO2 72%.
What needs to be corrected?

A

PaCO2

38
Q

On bypass gas results: PaO2 200 mmHg; PaCO2
32 mmHg; pH 7.48; SvO2 72%.
What change do you make?

A

Decrease ratio

39
Q

On bypass gas results: PaO2 95 mmHg; PaCO2
39 mmHg; pH 7.40; SvO2 75%.
What needs to be corrected?

A

PaO2

40
Q

On bypass gas results: PaO2 95 mmHg; PaCO2
39 mmHg; pH 7.40; SvO2 75%.
What change do you make?

A

Increase FiO2

41
Q

On bypass gas results: PaO2 250 mmHg; PaCO2
52 mmHg; pH 7.28; SvO2 60%.
Which of the following will you do first?

A

Increase blood flow

Perf Tech (6 decks)

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