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The problem of hemoglobin switching in premature infants and IUGR infants
Insights
Hemoglobin switching, crucial for infant adaptation, is delayed in premature and growth-restricted infants. Respiratory distress syndrome infants show impaired 2,3-DPG increase, maintaining high oxygen affinity.
Area of Science:
- Neonatal Physiology
- Hematology
- Perinatal Medicine
Background:
- Hemoglobin switching is vital for neonatal adaptation after birth.
- Understanding this process in premature infants is critical for their survival and development.
- Factors influencing oxygen affinity impact fetal and neonatal blood oxygen transport.
Purpose of the Study:
- To investigate the timing and regulation of hemoglobin switching in premature infants.
- To identify factors affecting oxygen affinity in fetal and neonatal blood.
- To understand the role of 2,3-diphosphoglycerate (2,3-DPG) in neonatal adaptation.
Main Methods:
- Analysis of hemoglobin profiles in premature infants.
- Assessment of oxygen affinity in fetal and neonatal blood samples.
- Evaluation of 2,3-DPG levels in infants with and without respiratory distress syndrome (RDS).
Main Results:
- Hemoglobin switching requires maturation; it is delayed by at least 3 weeks in premature infants (27–32 weeks gestation).
- Intrauterine growth retardation (IUGR) infants exhibit delayed hemoglobin switching, but show a compensatory increase in 2,3-DPG post-birth.
- Infants with respiratory distress syndrome (RDS) display a delayed 2,3-DPG increase, resulting in persistently high oxygen affinity.
Conclusions:
- Hemoglobin switching is significantly delayed in premature and IUGR infants, impacting extrauterine adaptation.
- Compensatory mechanisms like 2,3-DPG increase aid adaptation in some high-risk neonates.
- RDS disrupts normal adaptation by impairing 2,3-DPG regulation, leading to high oxygen affinity and potential complications.
Abstract:
Understanding the hemoglobin switching regulation mechanism in extremely premature infants is particularly important for understanding the extrauterine adaptation of the infants. In this study, we sought to identify factors influencing oxygen affinity in fetal blood and neonatal blood and obtained these results. (1) Aging is required for hemoglobin switching. (2) Switching in premature infants (27 to 32 weeks) is delayed at least 3 weeks in comparison with full-term infants. (3) A delay in the switching of fetal hemoglobin to adult hemoglobin was confirmed in IUGR (intrauterine growth retardation) infants. However, there is a compensatory increase in 2, 3-DPG for adaptation after birth. (4) A delay in 2, 3-DPG increase was observed in RDS (respiratory distress syndrome) infants, and oxygen affinity remained high.