Transfusion related morbidity in premature babies: Possible mechanisms and implications for practice

Area of Science:

• Neonatal Medicine
• Pediatric Hematology
• Biochemistry

Background:

• Premature infants, especially those with low birth weight, often require multiple blood transfusions.
• Major complications of prematurity include bronchopulmonary dysplasia, retinopathy of prematurity, intraventricular hemorrhage, and necrotizing enterocolitis.
• Existing research shows correlations between transfusions and these conditions, but the underlying pathophysiology is not well understood.

Purpose of the Study:

• To review recent findings on how the preparation and storage of pediatric packed red blood cells affect their heme, iron, and oxidative status.
• To relate these changes to the premature infant's capacity to handle them post-transfusion.
• To present a novel hypothesis on transfusion-related morbidity in premature infants.

Main Methods:

• Literature review of recent studies.
• Analysis of the influence of preparation and storage on red blood cell unit composition (heme, iron, oxidative status).
• Correlation of these factors with the physiological reserves of premature infants.

Main Results:

• Pediatric packed red blood cells can be a source of heme, redox-active iron, and free radicals, increasing with storage duration.
• Hemolysis of transfused red blood cells adds further iron and cell-free hemoglobin to the infant.
• Premature infants, particularly those with low birth weight and gestational age, have limited capacity to manage additional iron, heme, and oxidative loads.

Conclusions:

• Transfusion of stored red blood cells can exacerbate iron overload and oxidative stress in premature infants, potentially contributing to major complications.
• A novel hypothesis suggests these factors play a significant role in transfusion-related morbidity.
• Strategies to mitigate this risk include optimizing preparation and storage of blood products and modifying clinical practices.