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Flashcards in Oxygen therapy Deck (22):
1

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

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

2

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

IncreasedTemp
Increased 2-3 DPG
Increased (H+)

3

What are the causes of Hypoxia?

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

4

What are the causes of Hypoxemia?

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

5

What are the causes of Dysoxia?

Cellular use of O2 is abnormally decreased
Cyanide poisoning

6

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

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

7

What are the causes of Physiologic Shunt?

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

What are the causesof Physiologic Dead Space?

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

9

What are the physiologic Effects of Hypoxia?

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

What are the CLinical Objectives in Oxygen therapy?

Correct Hypoxemia
(Adults/kids SaO2

11

What is the pathological response to Oxygen therapy?

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

12

What Disease staes are caused by Oxygen tharapy?

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

13

What are the different forms of Oxygen monitoring?

Pulse Oximetry
Arterial Blood Gas
Capillary Sampling

14

What are indications of Oxygen therapy?

Air Embolism
CO poisoning
Wound therapy

15

What are the complictions of Hyperbaric O2 therapy?

Barotrauma caused by high pressure
CNS, Pulm complications caused by O2 toxicity

16

What are the different Forms of delivery of O2 therapy?

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

Waht are the Pros/Cons of Nasal Cannula?

Comfotable
Low cost
Mobility
Mouth breathing ok

Cant do High O2
Requires adequate vent pattern

18

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

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

Interferes with eating/talking
Irritating to face
Var FiO2

19

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

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

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

Good for short term
Similar to partial rebreather

Higher potential for O2 Tox

21

What are the Pros/Cons of the Venturi mask?

Delivers exact FiO2
FiO2 independant of vent rate

Interferes with eating/talking
Condensation
Needs to fit well!

22

What are the Pros/Cons of the Aerosol mask?

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

Water can build up in tubing
Heater malfunction