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Undernutrition as a major contributing factor in the pathogenesis of bronchopulmonary dysplasia
1Department of Medicine, University of Miami School of Medicine, 33136.
Insights
Undernutrition significantly impacts lung defenses and repair, contributing to bronchopulmonary dysplasia (BPD) in premature infants. Optimizing nutritional support is crucial for improving outcomes in very-low-birthweight infants receiving respiratory support.
Area of Science:
- Neonatal Medicine
- Pediatric Pulmonology
- Nutritional Science
Background:
- Bronchopulmonary dysplasia (BPD) is a common chronic lung disease in very-low-birthweight (VLBW) infants requiring intensive respiratory support.
- VLBW infants often experience undernutrition during critical illness due to limited caloric and nutrient reserves.
- Adequate nutrition is vital for lung defense, repair, and overall clinical outcomes in these vulnerable infants.
Purpose of the Study:
- To investigate the role of nutritional status in the pathogenesis of BPD.
- To explore how undernutrition interacts with other factors contributing to BPD.
- To determine if optimized nutritional support can mitigate BPD development and improve outcomes in VLBW infants.
Main Methods:
- Review of experimental and clinical studies examining the relationship between nutrition and BPD.
- Analysis of the impact of nutrient deficiencies (vitamins A, E, copper, zinc, iron, selenium, essential fatty acids) on lung function.
- Evaluation of how nutritional status influences the lung's response to hyperoxia, barotrauma, infection, and other stressors.
Main Results:
- Undernutrition is a significant pathogenetic factor in BPD development.
- Nutritional status critically affects the lung's ability to resist damage, repair cells, grow, and fight infection.
- Experimental and clinical data suggest undernutrition exacerbates BPD by interacting with other known etiologic factors.
Conclusions:
- Optimizing nutritional support in VLBW infants receiving respiratory support may be a key preventive strategy for BPD.
- Improved nutritional management can enhance lung resilience and potentially alter the clinical course of BPD.
- Addressing nutritional deficits is essential for improving the long-term outcomes of premature infants with chronic lung disease.
Abstract:
The protean effects of undernutrition on lung defenses and repair capabilities suggest that less than adequate nutritional support is a key pathogenetic factor in the development of bronchopulmonary dysplasia (BPD). Very-low-birthweight (VLBW, less than or equal to 1,000 g) premature infants who require intensive respiratory support have a distressingly high incidence of chronic lung disease or BPD. Many VLBW infants are currently undernourished during the most acute phase of their respiratory illness. Because VLBW newborns have only meager caloric reserves (fat, glycogen), and have only marginally sufficient stores of nutrients needed for effective lung defenses and repair capacity (vitamins A and E, copper, zinc, iron, selenium, essential fatty acids, etc.), the adequacy of nutritional support provided them will almost certainly influence their ability to tolerate early stress, and it may play a critical role in their clinical outcome. Experimental studies, combined with a limited number of clinical studies, clearly demonstrate that undernutrition can interact with each of the other well-accepted etiologic factors involved in the pathogenesis of BPD. Nutritional status affects the lung's ability to resist hyperoxic damage, to replace damaged/sloughed lung cells caused by barotrauma, to promote continued lung growth, to resist infection, and to tolerate prolonged and potentially toxic stresses in general. By providing more ideal nutritional support, clinicians may be able to apply preventive treatment to influence the outcome of intensive respiratory therapy in the VLBW newborn.