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Preterm infants with high polyunsaturated fatty acid and plasmalogen content in tracheal aspirates develop
M Rüdiger1, A von Baehr, R Haupt
1Department of Neonatology, Charité, Hospital of Humboldt University, Berlin, Germany.
Insights
Higher levels of polyunsaturated fatty acids (PUFA) and plasmalogens in preterm infants are linked to a lower risk of bronchopulmonary dysplasia (BPD). These crucial lipids decrease during the first day of mechanical ventilation with oxygen.
Area of Science:
- Neonatal Medicine
- Pulmonary Medicine
- Biochemistry
Background:
- Bronchopulmonary dysplasia (BPD) is a chronic lung disease in preterm infants, often exacerbated by oxygen toxicity.
- Polyunsaturated fatty acids (PUFA) and plasmalogens are key components of pulmonary surfactant and are susceptible to lipid peroxidation.
- Understanding the role of these lipids in BPD pathogenesis is crucial for developing preventative strategies.
Purpose of the Study:
- To investigate the association between initial concentrations of PUFA and plasmalogens and the development of BPD in extremely preterm infants.
- To determine if mechanical ventilation with oxygen affects the levels of PUFA and plasmalogens in these infants.
Main Methods:
- A prospective, noninterventional study was conducted in a Level III neonatal intensive care unit.
- Tracheal aspirates were collected from 25 extremely preterm infants with respiratory distress syndrome and from healthy term infants.
- Gas chromatography was used to quantify PUFA and dimethylacetals (DMA, representing plasmalogens).
Main Results:
- Infants who did not develop BPD had significantly higher relative percentages of PUFA and DMA compared to those who developed BPD.
- Levels of PUFA and DMA in healthy term infants were similar to those in the BPD group.
- In non-BPD infants, initially higher PUFA and DMA levels decreased within the first day of ventilation to levels seen in the BPD group.
Conclusions:
- Elevated initial levels of PUFA and plasmalogens in tracheal aspirates are associated with a reduced risk of BPD.
- Mechanical ventilation with oxygen leads to a reduction in these protective lipids within the first day of life.
Objective:
Oxygen toxicity causes chronic bronchopulmonary dysplasia (BPD) in extremely preterm infants. Polyunsaturated fatty acids (PUFA) and plasmalogens are the two main substrates for lipid peroxidation in the pulmonary surfactant. In the present study, we tested whether low concentrations of both were associated with development of BPD and whether both were further reduced during mechanical ventilation with oxygen.
Design:
Prospective, noninterventional, descriptive study.
Setting:
Level III neonatal intensive care unit in a university hospital.
Patients:
In 25 extremely low birth weight infants with respiratory distress syndrome, tracheal aspirates were collected immediately after birth and in the following 4 days. As control, tracheal and pharyngeal aspirates were collected from healthy infants immediately after birth. The amount of PUFA and dimethylacetals (DMA, representing plasmalogens) was determined gas-chromatographically.
Interventions:
None.
Measurements And Main Results:
The relative percentages of PUFA and DMA on all fatty acids in non-BPD infants (PUFA% 26+/-8.9, DMA% 3.5+/-1.2) were higher compared with infants who developed BPD (PUFA% 14.5+/-3.8, DMA% 1.8+/-0.9). In term healthy infants, DMA% and PUFA% were in the same range as in the BPD group. The higher levels found for non-BPD infants decreased after day 1 to values equal to the BPD group and remained low.
Conclusions:
The results suggest that initially higher levels of PUFA and plasmalogens in the tracheal effluent are associated with a reduced risk of developing BPD and are reduced during the first day of ventilation.