Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
25 Cards in this Set
- Front
- Back
|
PaO2 trend with age?
|
It decreases by 4 with each decade after 20yo
i.e. 20 = 96-104 30 = 92-100 60 = 79-87 etc |
|
|
Equation for amount of O2 dissolved in plasma?
|
PaO2 x .003
|
|
|
Equation for amount of O2 bound to Hb?
|
Hb x 1.34 x SaO2
|
|
|
Normal Arterial Oxygen Content = ??
|
~20vol%
|
|
|
Normal amount of O2 bound to Hb?
|
19.7 mL
|
|
|
Normal amount of O2 in plasma?
|
0.3mL
|
|
|
Effect on Arterial Oxygen Content by increasing PaO2 5 fold?
|
it increases to 21.2 vol%
which ain't much. this is why oxygen bars aren't worth your money |
|
|
Delivered O2 is equal to???
|
Oxygen Content x Cardiac Output
|
|
|
What is normal DO2?
|
1000mL/min
|
|
|
When is hyperbaric O2 indicated?
|
carbon monoxide poisoning
smoke inhalation |
|
|
Define Hypoxia?
|
deficiency of O2 getting to tissues
|
|
|
Types of Hypoxia?
|
Histologic
Anemic Circulatory/Stagnant |
|
|
Define Histologic Hypoxia?
|
cells are unable to utilize O2
|
|
|
When might histologic hypoxia occur?
|
Cyanide Poisoning
Septic Shock |
|
|
Define Anemic Hypoxia?
|
When Hb concentration is lower than normal and unable to transport O2
|
|
|
When might anemic hypoxia occur?
|
Sickle Cell
CO poisoning metHb |
|
|
Define Circulatory Hypoxia?
|
When the CV system fails to transport O2 to tissues, usually b/c of low Cardiac Output
|
|
|
Difference between hypoxia and hypoxemia?
|
Hypoxemia is a reduction in the partial pressure of O2 in the blood.
This leads to hypoxia |
|
|
Causes of Hypoxemia?
|
Shunting
V/Q mismatching Diffusion Defects Hypoventilation |
|
|
Normal Arterial Blood Gas numbers?
|
pH = 7.35-7.45
PaCO2 = 35-45 PaO2 = 80-100 HCO3 = 22-24 |
|
|
In general, as PaCO2 increases by 1, what happens to PaO2?
|
it decreases by 1.25
|
|
|
What is CPAP?
|
Continuous Positive Airway Pressure
its like sticking your head out of the car at 60mph |
|
|
When do we use CPAP?
|
Obstructive sleep apnea
|
|
|
PO2 + PCO2 = between 110 and 130
AND the patient is hypoxemic CAUSE? |
Hypoventilation
|
|
|
PO2 + PCO2 < 110
CAUSE? |
V/Q Mismatch
Diffusion Defect Shunt |
