Ch 19 Analysis And Monitoring Of Gas Exchange

Question 1

When doing ABG where is it most often done

Answer 1

Radial artery

Question 2

Indications for ABG

Answer 2

Evaluate ventilation and oxygenation, asses the patients response to therapy or diagnosis, and monitor severity and progression of a disease process

Question 3

What are precautions and possible complications to ABG

Answer 3

Arteriospasm, hemorrhage, trauma to vessel, air or clotted embolism, hematoma, vasovagal response

Question 4

The arterial sampling what should you not do

Answer 4

Never recap a used needle without a safety device

Never transport sample with needle attached to the syringe

Question 5

What can clinicians do to avoid preanalytical errors

Answer 5

-Obtain anaerobically: an air bubble artificially increases PaO2 and artificially decreases PaCO2 and pH

• Properly anti coagulated : heparin that has not been properly incorporated will artificially increase O2 and decrease CO2

-Analyzed within 15 min: if not ran in time, O2 is artificially decreased due to oxygen consumption

Question 6

What is pulse oximetry

Answer 6

Most rapid assessment of oxygenation. It is a noninvasive monitoring technique performed at bedside

Question 7

What can pulse oximerty not distinguish

Answer 7

Cannot distinguish HbCO from Hbo2, reads falsely high in CO poisoning