CPAP exam 4 Flashcards

1
Q

What % of O2 is in plasma vs bound to hemoglobin?

A

3% plasma and 97% bound to Hb

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2
Q

ABGs read Os levels where?

A

ABGs read the O2 that is dissolved in plasma

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3
Q

Normal Hb levels for male and female

A

Male: 14-16 g/100mL
Female: 12-15

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4
Q

Why is adult Hb never fully 100% saturated?

A

This is due to normal anatomical shunts.

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5
Q

Left shift at the lung

A

This would mean there is an increase in affinity which would increase the loading of O2

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6
Q

What 3 things, if increased will cause a right shift in the curve?

A

Increased H+ ions (acid), CO2, and temperature.

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7
Q

Where do you want a left shift in the curve to occur in the body, what about a right shift?

A

Left shift at Lung, Right at Tissue

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8
Q

Which shift causes a decreased affinity?

A

Right shift, which would increase offloading of O2 at tissue site.

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9
Q

Three main factors that decrease oxygen delivery

A

Decreased Hb levels, oxygen in blood (PaO2), and decreased CO.

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10
Q

shunt

A

blood flow without ventilation

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11
Q

deadspace

A

ventilation without blood flow

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12
Q

four types of hypoxia

A

Hypoxic, anemic, circulatory, histotoxic

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13
Q

hypoxemia

A

Low PaO2 in blood

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14
Q

hypoxia

A

Inadequate tissue oxygenation

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15
Q

carbonic anhydrase

A

The enzyme catalyst that helps create the formation of HCO3

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16
Q

Ratio of HCO3 to PaCO2 to maintain pH

A

20:1 ratio

17
Q

Shunt equation

A

Qs/QT

18
Q

Ranges for acceptable shunts

A

<10% is normal, 20-30 is bad, >30% is life threatening

19
Q

CO2 normal production

A

200mL/min

20
Q

O2 normal production

A

250mL/min

21
Q

Venous saturation

A

SvO2 75% PvO2- 40mmHg

22
Q

CaO2

A

18-20 vols%

23
Q

Normal A-a gradient

A

10-15mmHg, 200 is serious problem

24
Q

Where admixture is done by looking at what?

A

ABG at radial artery, femoral artery, and pulmonary artery….in that order

25
Q

Common cause of dead space

A

Pulmonary embolism

26
Q

Common cause of shunt

A

Restrictive lung disease

27
Q

Normal V/Q value

A

0.8

28
Q

Increased FiO2 will help treat what but not what?

A

Deadspace but will not help treat shunt.

29
Q

V/Q value for determining shunt vs deadspace

A

Shunt is <0.8 deadspace is more than .8

30
Q

Which is the only shunt that responds to O2 therapy?

A

shunt-like effect

31
Q

How do you find the respiratory quotient?

A

CO2 produced:O2 consumption

32
Q

Where do you find a low V/Q in the lung?

A

at the bottom

33
Q

Normal C(a-v)O2

A

5 vols%

34
Q

A shunt will always result in what?

A

hypoxemia

35
Q

How is CO2 mainly transported?

A

Bicarbonate (HCO3)

36
Q

True or absolute shunts will always result in what?

A

Refractory hypoxemia a.k.a unresponsive to O2 Tx

37
Q

Carbon monoxide is an example of which type of hypoxia?

A

Anemic….bleeding out also causes this.