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Flashcards in Oxygen therapy Deck (22)
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1
Q

What are the factors that will cause a Left shift in Oxyhemoglobin dissociation curve?

A

DecreasedTemp(hypothermia)
Decreased 2-3 DPG
Decreased (H+)
CO

2
Q

What are the factors that will cause a Right shift in Oxyhemoglobin dissociation curve?

A

IncreasedTemp
Increased 2-3 DPG
Increased (H+)

3
Q

What are the causes of Hypoxia?

A

Hypoxemia(resp system cant oxygenate)
Impaired Blood Flow(dec Heart)
Dysoxia(tissues cant utilize O2)

4
Q

What are the causes of Hypoxemia?

A
Low ambient PO2
Hypoventilation
Hb Deficiencies
Impaired Alveolar-Cap diffusion
V/Q Mismatch
Shunts
5
Q

What are the causes of Dysoxia?

A

Cellular use of O2 is abnormally decreased

Cyanide poisoning

6
Q

What are the causes of Normal O2 content but impaired delivery to tissues?

A
Circulatory failure(shock)
Local Reduction in perfusion
-clot
-stenosis
Ischemia
MI, Stroke
7
Q

What are the causes of Physiologic Shunt?

A

Anatomic(BF doesn’t participate in gas exchange)
-R=>L Shunt
DOESNT RESPOND TO O2 THERAPY

Alveolar Shunts(Areas of poorventilation)
-Pneumonia, COPD, atelectaisis
8
Q

What are the causesof Physiologic Dead Space?

A

Anatomical: Conducting airways
Alveolar: Inc ventilation/poorly perfused alveoli

9
Q

What are the physiologic Effects of Hypoxia?

A
Pulm vasoconstriction
Inc CV workload
Harmful effects on Myocardial Funct
Impaired renal function
Cerebral vasodilation, Inc cerebral BF
Anaerobic Mets, LA accumulation, metabolic Acidosis
10
Q

What are the CLinical Objectives in Oxygen therapy?

A

Correct Hypoxemia

(Adults/kids SaO2

11
Q

What is the pathological response to Oxygen therapy?

A

Damage Capillary Endothelium
Thickening of alveolar-cap membrane
Alveolar Exudate and Consolidation causing physiological shunting
Pulm fibrosis and HTN at end stage

12
Q

What Disease staes are caused by Oxygen tharapy?

A

O2 induced hypoventilation
Retinopathy of Prematurity
Absorptive Atelectais(N2 replaced with O2)

13
Q

What are the different forms of Oxygen monitoring?

A

Pulse Oximetry
Arterial Blood Gas
Capillary Sampling

14
Q

What are indications of Oxygen therapy?

A

Air Embolism
CO poisoning
Wound therapy

15
Q

What are the complictions of Hyperbaric O2 therapy?

A

Barotrauma caused by high pressure

CNS, Pulm complications caused by O2 toxicity

16
Q

What are the different Forms of delivery of O2 therapy?

A
Low flow systems
-nasal cannula
-simple mask
-partial/non rebreather with reservoir
High Flow Systems
-Venturi mask
-aerosol mask
Enclosures
-Tents and hoods
-Isolettes
17
Q

Waht are the Pros/Cons of Nasal Cannula?

A

Comfotable
Low cost
Mobility
Mouth breathing ok

Cant do High O2
Requires adequate vent pattern

18
Q

What are the Pros/Cons of the Simple O2 mask?

A

Overflow valves if flow rate too high
Higher inspired O2
WOnt dry Mucous membranes

Interferes with eating/talking
Irritating to face
Var FiO2

19
Q

What are the Pros/Cons of the Partial Rebreather Mask?

A

Higher FiO2
Better gas reserve

Requires tight fit
Not practical for long term therapy
Remove for eating/talking

!!! Keep reservoir filled!!!
Monitor ABG
Keep good seal

20
Q

What are the Pros/Cons of the Non-rebreather mask?

A

Good for short term
Similar to partial rebreather

Higher potential for O2 Tox

21
Q

What are the Pros/Cons of the Venturi mask?

A

Delivers exact FiO2
FiO2 independant of vent rate

Interferes with eating/talking
Condensation
Needs to fit well!

22
Q

What are the Pros/Cons of the Aerosol mask?

A

Humidification and heat
Port Can control FiO2 28%-100%

Water can build up in tubing
Heater malfunction