NURSING EXAM QUESTIONS
PHARMACOLOGY
Question
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The P50 of sickle cell hemoglobin is
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19 mm Hg
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26 mm Hg
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31 mm Hg
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35 mm Hg
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Explanation:
Detailed explanation-1: -p50-The p50 is the pressure at which hemoglobin is 50% saturated (27 mmHg on the X-axis). Arterial blood-Hemoglobin is approximately 100% saturated at an oxygen pressure of 100 mmHg.
Detailed explanation-2: -Patients with sickle cell disease have a variable Hb level that may range from 7.0 to 11.0 g/dL in their steady state condition.
Detailed explanation-3: -p50 is the oxygen tension when hemoglobin is 50 % saturated with oxygen. When hemoglobin-oxygen affinity increases, the oxyhemoglobin dissociation curve shifts to the left and decreases p50. When hemoglobin-oxygen affinity decreases, the oxyhemoglobin dissociation curve shifts to the right and increases p50 (Figure 1).
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