CONCEPTS OF OXYGENATION Flashcards

1
Q

OXYGEN SATURATION (SA02):

A

PERCENTAGE OF HEMOGLOBIN THAT IS BOUND TO OXYGEN

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2
Q

PULMONARY DIFFUSION

A

EXCHANGE OF GAS MOLECULES (OXYGEN AND CARBON DIOXIDE) FROM AREAS OF HIGH CONCENTRATION TO AREAS OF LOW CONCENTRATION

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3
Q

PULMONARY DIFFUSION 2

A

PROCESS BY WHICH OXYGEN AND CARBON DIOXIDE ARE EXCHANGED FROM AREAS OF *HIGH CONCENTRATION TO AREAS OF LOW CONCENTRATION AT THE AIR–BLOOD INTERFACE.

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4
Q

PULMONARY PERFUSION:

A

BLOOD FLOW THROUGH THE PULMONARY VASCULATURE. REMEMBER, THE BLOOD IS PUMPED INTO THE LUNGS BY THE RIGHT VENTRICLE THROUGH THE PULMONARY ARTERY.

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5
Q

*PARTIAL PRESSURE OF OXYGEN IN THE ARTERIES (PAO2):

A

THE VOLUME OF OXYGEN PHYSICALLY DISSOLVED IN THE PLASMA.

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6
Q

PULSE OX

A

The pulse ox is
- an essential tool in monitoring a patient status
- indirectly* indicates arterial hemoglobin saturation
- Only measures one component

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7
Q

The Oxyhemoglobin Disassociation Curve (OHDC)

A
  • can provide a more accurate picture
  • can be very challenging
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8
Q
A
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9
Q

REVIEW

A
  • EACH RBC HAS HUNDREDS OF THOUSANDS OF HBG MOLECULES
  • EACH HEMOGLOBIN CAN BIND 4 OXYGEN MOLECULES
  • WHEN BLOOD PASSES THROUGH THE ALVEOLI, O2 DIFFUSES FROM ALVEOLI INTO RBCS AND BINDS TO HEMOGLOBIN
  • HEMOΒ­GLOBIN CAN’T BE SATURATED MORE THAN 100%
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10
Q
A
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11
Q

Pulse Ox (indirect SAO2):

A

93-97%

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12
Q

Partial Pressure (PA02):

A

80-100

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13
Q

PaO2

A

> 70 mm Hg
- Relatively safe levels: PaO2 45–70 mm Hg
- Dangerous levels: PaO2 <40 mm Hg

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14
Q

OXYHEMOGLOBIN DISSOCIATION CURVE

A

OXYHEMOGLOBIN DISSOCIATION CURVE
- SHIFT TO THE RIGHT
β€” Higher demand for oxygen from the tissues
β€” Hgb lets go of O 2 to go into the tissues
β€” CAUSES:
β€” - Decreased pH
β€” - increased temp
β€” - increased carbon dioxide concentration
β€” - Increased metabolic demand
- SHIFT TO THE LEFT
β€” Less demand for oxygen from the tissues
β€” Hgb binds tightly to O 2
β€” CAUSES:
β€” - Increased pH
β€” - decreased temp
β€” - Decreased carbon dioxide levels
β€” - Decreased metabolic demand

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15
Q

E.G. ACUTE MI
- Patient has reduced oxygen due to acute MI.
- Body compensates by increasing the release of oxygen. (The curve shows at lower levels of P02, hemoglobin releases oxygen more readily to tissues to help perfusion despite decreased blood flow.)
- The release of more oxygen shows as a shift to the right in response to factors such as decreased pH and increase levels of C02 which can be present during an MI
- The shift to the right enhances oxygen release

A

CLINICAL SIGNIFICANCE FOR THE NURSE
- IS THE PULSE OX FUNCTIONING NORMALLY?
- WHERE ON THE CURVE DOES THE PATIENTS DATA FALL (FLAT OR CURVE)
- DON’T ALWAYS ASSUME IF THE PULSE OX ALARMS THE PATIENT NEEDS MORE O2
- DON’T ALWAYS ASSUME IF THE PULSE OX IS NORMAL THE PATIENT ISN’T STARVING FOR OXYGEN
- INTERPRET VALUES BASED ON OVERALL PATIENT CONDITION
- OXYGEN THERAPY MANAGEMENT
- ASSESSMENT OF RESPIRATORY STATUS
- MONITORING FOR TISSUE HYPOXIA
- UNDERSTANDING PATIENT CONDITIONS
- COLLABORATION WITH THE INTERDISCIPLINARY TEAM

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