Which of the following sites are used for arterial blood sampling by percutaneous needle punc-ture? 1. Femoral 2. Radial 3. Brachial 4. Carotid
a. 2 and 3 only
b. 1 and 4 only
c. 1, 2, and 3 only
d. 1, 2, 3, and 4
Q. 2 While checking a polarographic (Clark) electrode, you determine that the device fails to read 100 when exposed to pure O2. Which of the following actions would be the proper first step?
a. Check the silica crystals.
b. Send the device out for repair.
c. Replace the analyzer's batteries.
d. Change the analyzer's fuel cell.
Q. 3 During calibration of a Clark polarographic O2 analyzer, you cannot get the sensor to read 100 when exposed to 100 O2, even after adjusting its calibration control. The unit has new batteries.
Which of the following actions would be correct?
a. Use it only with low FiO2 values.
b. Send the device out for repair.
c. Replace the unit's batteries.
d. Change the sensor or electrode.
Q. 4 You are asked to provide continuous monitoring of the FiO2 provided by a humidified O2 deliv-ery system using a galvanic cell analyzer. Where would you install the analyzer's sensor?
a. Proximal to the heated humidifier
b. On the expiratory side of the circuit
c. Distal to the heated humidifier
d. As close to the patient as possible
Q. 5 Which of the following are true about invasive versus noninvasive monitoring?
1. Invasive procedures require insertion of a device into the body.
2. Laboratory analysis of gas exchange is usually noninvasive in nature.
3. Physiologic monitoring can be either invasive or noninvasive.
4. Invasive procedures provide more accurate data but carry greater risks.
a. 2 and 4 only
b. 1, 3, and 4 only
c. 2 only
d. 1, 2, 3, and 4
Q. 6 How does the Clark polarographic O2 electrode function?
a. It measures the magnetic properties of O2 versus N2.
b. It measures the electrical potential across a Wheatstone bridge.
c. It uses O2 to produce a reduc-tion-oxidation reaction.
d. It measures the comparative cooling effect on a heated wire.
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