A nurse educator is reviewing the implications of the oxyhemoglobin dissociation curve with regard to the case of a current patient
The patient currently has normal hemoglobin levels, but significantly decreased SaO2 and PaO2 levels. What is an implication of this physiological state?
A) The patient's tissue demands may be met, but she will be unable to respond to physiological stressors.
B) The patient's short-term oxygen needs will be met, but she will be unable to expel sufficient CO2.
C) The patient will experience tissue hypoxia with no sensation of shortness of breath or labored breathing.
D) The patient will experience respiratory alkalosis with no ability to compensate.
Ans: A
Feedback:
With a normal hemoglobin level of 15 mg/dL and a PaO2 level of 40 mm Hg (SaO2 75%), there is adequate oxygen available for the tissues, but no reserve for physiological stresses that increase tissue oxygen demand. If a serious incident occurs (e.g., bronchospasm, aspiration, hypotension, or cardiac dysrhythmias) that reduces the intake of oxygen from the lungs, tissue hypoxia results.
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