Peak Expiratory Flow in Pulmonary Function Tests
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Questions and Answers

Your patient has pulmonary function tests ordered. One of the values that is measured is the Peak Expiratory Flow. This measures:

  • how quickly an individual can exhale (correct)
  • the amount of air an individual can exhale with force in one breath
  • the amount of air in an individual's lungs after inhaling as deeply as possible

    • A trauma patient comes into your ER after a motor vehicle accident. You see that his oxygen saturations are 92%, and are ready to put the nasal canula on him to increase his oxygen levels. However, his family member states that this patient has had emphysema for 10 years. You know that you should not attempt to get his oxygen up to 98% as you would in a healthy patient due to which of the following reasons?

  • This patient relies on central chemoreceptors located in the medulla to sense changes in blood CO2 to stimulate respirations
  • This patient relies on peripheral chemoreceptors to sense a decrease in arterial O2 levels to stimulate respiration (correct)
  • This patient relies on Hering-Breuer reflexes to detect stretching of bronchi and bronchioles to stimulate respiration
  • This patient relies on baroreceptors to detect changes in blood pressure to stimulate respiration

    • Respiratory acidosis is the result of hypercapnia. How do the kidneys compensate for respiratory acidosis?

  • they secrete hydrogen ions and reabsorb bicarbonate (correct)
  • they secrete renin which affects lung function
  • they secrete hydrogen ions and reabsorb carbon dioxide
  • they reabsorb water to dilute the excess acid in the blood

    • Trauma leading to air entering the pleural cavity is termed:

    <p>pneumothorax</p> Signup and view all the answers

    Stroke patients are routinely assessed by speech language pathologists to determine their swallowing efficacy secondary to loss of esophageal muscle control, and recommend best feeding practices. This is to prevent which of the following?

    <p>aspiration pneumonia</p> Signup and view all the answers

    You are taking care of your total knee replacement patient postoperatively. One of the standing orders is to encourage use of the incentive spirometer every hour. You know that this is to prevent which of the following (choose BEST answer)?

    <p>atelectasis</p> Signup and view all the answers

    How does hyperthermia (fever) affect hemoglobin affinity for oxygen?

    <p>decreases</p> Signup and view all the answers

    Your patient has been determined to have ventilation-perfusion mismatching. There is an area with a pulmonary embolism that has resulted in a "dead space". You know that in this area, which of the following has occurred?

    <p>This is a high V/Q, where lungs are ventilated, but not perfused</p> Signup and view all the answers

    Which of the following will cause hypoxia to drive respiration?

    <p>Chronic hypercapnia</p> Signup and view all the answers

    Which of the following is NOT true of the atrioventricular valves?

    <p>They are closed during diastole</p> Signup and view all the answers

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