- 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)

Test 4 Flashcards by Marcus Chlopek

Which of the following is true as oxygen transfer increases?

Arterial PO2 will increase

How well did you know this?

Not at all

Perfectly

Which of the following is true as CO2 transfer increases?

Arterial PCO2 decreases

How well did you know this?

Not at all

Perfectly

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

0.5:1

How well did you know this?

Not at all

Perfectly

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

1.5:1

How well did you know this?

Not at all

Perfectly

changing the GF:BF ratio for a bubble oxygenator

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

How well did you know this?

Not at all

Perfectly

Membrane oxygenators

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)

How well did you know this?

Not at all

Perfectly

O2 too low

increase FiO2 (fraction of inspired)

How well did you know this?

Not at all

Perfectly

O2 too high

decrease FiO2

How well did you know this?

Not at all

Perfectly

CO2 too low

decrease GF:BF ratio

How well did you know this?

Not at all

Perfectly

CO2 too high

increase GF:BF ratio

How well did you know this?

Not at all

Perfectly

SvO2 too low

increase blood flow

How well did you know this?

Not at all

Perfectly

Calculating new GF:BF ratio

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

How well did you know this?

Not at all

Perfectly

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

.74:1

How well did you know this?

Not at all

Perfectly

Calculating new gas flow

New Ratio x Blood Flow = New gas flow

How well did you know this?

Not at all

Perfectly

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

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

3.8

How well did you know this?

Not at all

Perfectly

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

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

1.65:1

How well did you know this?

Not at all

Perfectly

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

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

7.59

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

bubbles produced/min increases

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

Gas transfer area is increased

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

Gas volume is increased

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

O2 & CO2 transfer will increase

as oxygen transfer decreases the arterial O2 does what

Arterial O2 will decrease

as carbon dioxide transfer decreases arterial CO2 does what

Arterial CO2 will increase

as turbulence increases in a membrane oxygenator

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

What will increase the gas-to-blood flow ratio

- Decrease blood flow; No change in gas flow | - No change in blood flow; Increase gas flow

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?

GF to BF ratio will decrease

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

Carbon dioxide transfer decreases

On bypass gas results: PaO2 155 mmHg; PaCO2 | 55 mmHg; pH 7.25; SvO2 75%. Which value do you look at first?

SvO2

On bypass gas results: PaO2 155 mmHg; PaCO2 | 55 mmHg; pH 7.25; SvO2 75%. Which value needs to be corrected?

PaCO2

On bypass gas results: PaO2 155 mmHg; PaCO2 | 55 mmHg; pH 7.25; SvO2 75%. What do you do?

Increase ratio

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.)

0.69:1;.69:1

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)

3.1

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

SvO2

On bypass gas results: PaO2 250 mmHg; PaCO2 | 41 mmHg; pH 7.38; SvO2 65%. What change do you make?

Increase blood flow

On bypass gas results: PaO2 300 mmHg; PaCO2 | 41 mmHg; pH 7.38; SvO2 75%. What needs to be corrected?

PaO2

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

Decrease FiO2

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

PaCO2

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

Decrease ratio

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

PaO2

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

Increase FiO2

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

Increase blood flow