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;
11 Cards in this Set
- Front
- Back
|
What does the PaO2 reflect?
|
-the lung's ability to transfer O2
-diminishes slowly w/ age |
|
|
What does hypoxemia occur secondary to?
|
-V/Q mismatch (most common)
-shunt -diffusion defect -true hypoventilation -breathing a reduced PaO2 |
|
|
What reflects the actual amount of O2 bound to Hb compared w/ total capacity?
|
SaO2 (clinically, >90% is considered adequate)
|
|
|
What does the PvO2 obtained from the pulmonary artery reflect?
|
tissue oxygenation (reflects balance between O2 delivery & O2 consumption)
|
|
|
What is a PvO2 <35 mmHg strong evidence of?
|
poor tissue oxygenation
|
|
|
What is a sudden drop in PvO2 most often caused by?
|
impaired circulation
|
|
|
What is the normal amount of CO bound to Hb?
|
0-1% (measured by co-oximetry)
|
|
|
In which direction will CO shift the oxyhemoglobin dissociation curve?
|
to the left (saturates Hb in place of O2 because of greater affinity)
|
|
|
How can you differentiate between causes of hypoxemia?
|
by adding PaO2 & PaCO2 while breathing 21% FIO2
-if total is between 110-130 mmHg, simple hypoventilation exists -if total is <110 mmHg, then usually lung dysfunction (shunt, V/Q mismatch, diffusion defect |
|
|
What are some situations in which a mixed acidosis can occur?
|
-CPR
-COPD w/ hypoxia -poisoning & drug OD |
|
|
What are some instances where a mixed alkalosis could occur?
|
-critically ill patients in ICU
-ventilator induced alkalosis in the face of chronic hypercapnia |
