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CNST Chapter 23 Oxygen Therapy TEST exam with verified solutions.
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CNST Chapter 23 Oxygen Therapy TEST exam with verified solutions.
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CNST Chapter 23: OxygenTherapy TEST exam with verified
solutions
A patient diagnosed with chronic obstructive pulmonary disease (COPD) is
on oxygen therapy at 3 L per nasal cannula. Which assessment finding
should alert the nurse to a potential problem with this patient?
a.
Respiratory rate of 26
b.
Low carbon dioxide levels
c.
Arterial oxygen saturation level of 99%
d.
Lower oxygen saturation levels at night than during the day
C
In the patient with COPD, high levels of oxygen can extinguish the
stimulus to breathe. In the individual with healthy lungs, the
chemoreceptors are sensitive to small changes in carbon dioxide levels
and effectively regulate ventilation. In patients with COPD who retain
carbon dioxide, the chemoreceptors are not sensitive to small changes in
carbon dioxide and regulate ventilation poorly. In these patients, it is the
change in the oxygen level that stimulates changes in ventilation. Patients
with COPD are at risk of retaining carbon dioxide and developing carbon
dioxide narcosis induced by administration of high levels of oxygen.
Uncontrolled oxygen administration may cause acute hypoventilation and
carbon dioxide retention with dire consequences. Arterial oxygen
saturation levels should be at 88% to 92% and no higher. Some patients
with COPD have normal oxygen levels during the day but oxygen
desaturation during sleep.
A patient with pneumonia is receiving supplemental oxygen. Which
assessment finding(s) by the nurse should be reported as an early
indication of hypoxia?
a.
Cyanosis around the lips and oral mucosa
b.
Anxiety and restlessness
c.
Decrease in the level of consciousness
d.
Decreased blood pressure and respiratory rate
, B
Anxiety, confusion, and restlessness are early signs of hypoxia. Cyanosis
around the lips and mouth is a sign of hypoxia, but it is a late sign.
Decreased level of consciousness, decreased respiratory rate, and
decreased blood pressure are also late signs of hypoxia. The respiratory
rate will increase as the body attempts to compensate for the decreased
level of oxygen. As hypoxia worsens, the respiratory rate may decline.
During early stages of hypoxia, blood pressure is elevated unless the
condition is caused by shock.
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A patient with chronic obstructive pulmonary disease (COPD) has carbon
dioxide retention and is ordered oxygen therapy. The nurse anticipates
the use of which oxygen delivery system?
a.
Face tent
b.
Face mask
c.
Nasal cannula
d.
Nonrebreathing mask
C
Oxygen can be delivered via the nasal cannula at flow rates of 1 to 2 L per
minute, which deliver 24% to 28% FiO2 and are useful for patients with
chronic lung disease. The face tent is used primarily for humidification and
for oxygen only when the patient cannot or will not tolerate a tight-fitting
mask. The FiO2 cannot be controlled, and there is no way to estimate how
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