EBME & Clinical Engineering Articles

Post Test

1. State two ways oxygen is carried in the blood.
   1. Dissolved in plasma and bound with haemoglobin.
   2. Dissolved in plasma and bound with carboxyhaemoglobin.
   3. Bound with haemoglobin and carbon monoxide.
   4. Dissolved in haemoglobin and bound with plasma.
2. Which of the following statements about total oxygen content is true?
   1. The majority of oxygen carried in the blood is dissolved in the plasma.
   2. The majority of oxygen carried in the blood is bound with haemoglobin.
   3. Only 1% to 2 % of oxygen carried in the blood is bound with haemoglobin.
   4. Total oxygen content is determined by haemoglobin ability to release oxygen to the tissues.
3. Which of the following statements about hypoxaemia is false?
   1. Obstructive sleep apnoea may cause carbon dioxide retention, but not hypoxaemia.
   2. Certain postoperative patients are at greater risk for hypoxaemia.
   3. Confusion may be a symptom of hypoxaemia.
   4. Even the obstetric patient may be at risk for hypoxaemia.
4. Pulse oximetry incorporates two technologies that require:
   1. Red and yellow light.
   2. Pulsatile blood flow and light transmittance.
   3. Haemoglobin and methaemoglobin.
   4. Veins and arteries.
5. Which of the following defines "SpO2"?
   1. Partial pressure of oxygen provided by an arterial blood gas.
   2. Oxygen saturation provided by an arterial blood gas.
   3. Oxygen saturation provided by a pulse oximeter.
   4. Partial pressure of oxygen provided by a pulse oximeter.
6. If your patient's oxygen saturation has fallen from 98% to below 90%, after receiving 4 liters 02 via nasal cannula, the following physiologic change may be occurring:
   1. Oxygen content is rapidly decreasing.
   2. PaO2 level is rapidly increasing.
   3. Oxygen content is slowly decreasing.
   4. PaO2 level is slowly increasing.
7. Pulse oximetry can be used to:
   1. Obtain invasive information about oxygenation.
   2. Provide acid-base profiles.
   3. Noninvasively monitor saturation values during ventilator weaning.
   4. Fully replace arterial blood gas testing.
8. Which of the following clinical conditions may contribute to inaccurate oxygen saturation readings as measured by a pulse oximeter?
   1. Venous pulsations.
   2. Mild anaemia.
   3. Sensor placed on a middle finger.
   4. Monitoring a patient during weaning from oxygen.
9. To troubleshoot motion artifact on a finger or toe sensor:
   1. Ensure the light source is directly across from the photodetector.
   2. Position the sensor below the level of the heart.
   3. Cover the sensor with an opaque material.
   4. Apply additional tape to the sensor to secure it in place.

Post Test Answers

1. a
2. b
3. a
4. b
5. c
6. a
7. c
8. a
9. a

References

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