ABGs

Question 1

Allens Test purpose

Answer 1

check for secondary or collateral blood flow

Question 2

For an adult, what size needle?

Answer 2

22-25 G

Question 3

Time frame for sample to be on ice?

Answer 3

Cannot exceed 30 min

Question 4

Purpose of ABG

Answer 4

How well oxygen is getting into your body

**this is how to explain it to pt

Question 5

What 3 things do blood gas analyzers MEASURE

Answer 5

pH, pCO2, PO2

Question 6

Blood gas analyzer calculates what?

Answer 6

Hb saturation/BiCarb/BE (base excess)

Question 7

What is used to measure pH in a blood gas example

Answer 7

Sanz electrode

Question 8

PO2 is measured by what in a blood gas example

Answer 8

Clark polarographic electrode

Question 9

What in vivo mean?

Answer 9

analyzing it inside the artery

Question 10

in vitro

Answer 10

removing blood then analyzing it outside the body (lab)

Question 11

Levey-jennings chart

Answer 11

Helps follow quality control

Question 12

systematic errors look like what?

Answer 12

theres a trend on the graph that changes gradually or abruptly (shift)

Question 13

What two things do ABGs reflect?

Answer 13

adequacy of oxygenation/adequacy of ventilation

Question 14

The ABGs reflect oxygenation and ventilation. Which values reflect them?

Answer 14

PaO2 reflects oxygenation while PaCO2 reflects ventilation and ability to ventilate without assistance

Question 15

Which values of the ABGs are considered “respiratory values”?

Answer 15

PaO2 and PaCO2

Question 16

Which values of ABGs represent the “metabolic values”?

Answer 16

HCO3 and BE

Question 17

Base/acid on pH scale

Answer 17

pH goes up the more basic the solution

Question 18

If you cant use the radial site, then go to brachial, after that what do you do?

Answer 18

Contact the physician

Question 19

Three reasons you can absolutely not puncture the site?

Answer 19

AV shunt and Negative Allen’s test, thrombolytics

Question 20

How long to wait to get ABGs for healthy lungs/heart

Answer 20

5-10 min

Question 21

How long should you wait if someone has unhealthy lungs OR heart?

Answer 21

20 to 30 minutes

Question 22

3 signs you might have venous blood

Answer 22

SaO2/PaO2 very off, blood doesnt fill syringe the normal way, if blood looks darker

Question 23

If you have an air bubble , what will happen to the PCO2 and PO2 values?

Answer 23

PCO2 will ALWAYS be lower, and PO2 will move towards 159mmHg.

Question 24

If you have air in your needle and your blood PO2 is less than 159mmHg, what will happen?

Answer 24

Due to equilibrium, more O2 will diffuse into the blood sample, RAISING the PO2 value

Question 25

Modified Allens test

Answer 25

this is when you OCCLUDE the arteries, when you only have them pump their fist it is referred to as just ‘Allen’s Test’

Question 26

Normal PiO2

Answer 26

159mmHg