As postnatal age increases, the oxygen dissociation curve (ODC) shifts in which direction?

Enhance your readiness for the MEDNAX Neonatal Nurse Practitioner Exam. Utilize flashcards, multiple-choice questions, and detailed explanations. Equip yourself for success!

Multiple Choice

As postnatal age increases, the oxygen dissociation curve (ODC) shifts in which direction?

Explanation:
The oxygen dissociation curve shifts in response to changes in hemoglobin type and factors that affect oxygen affinity. After birth, hemoglobin transitions from fetal to adult form and 2,3-BPG levels rise, along with other metabolic changes that favor delivery of oxygen to tissues. A rightward shift means hemoglobin has a lower affinity for oxygen, raising the PO2 at which hemoglobin releases O2 to the tissues (higher P50) and enabling easier unloading of oxygen when it’s needed. Therefore, as postnatal age increases, the curve shifts to the right, improving tissue oxygen delivery.

The oxygen dissociation curve shifts in response to changes in hemoglobin type and factors that affect oxygen affinity. After birth, hemoglobin transitions from fetal to adult form and 2,3-BPG levels rise, along with other metabolic changes that favor delivery of oxygen to tissues. A rightward shift means hemoglobin has a lower affinity for oxygen, raising the PO2 at which hemoglobin releases O2 to the tissues (higher P50) and enabling easier unloading of oxygen when it’s needed. Therefore, as postnatal age increases, the curve shifts to the right, improving tissue oxygen delivery.

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