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Pulmonary prostacyclin is associated with less severe respiratory distress in preterm infants
Patrik Lassus1, Lasse Viinikka, Olavi Ylikorkala
1Hospital for Children and Adolescents, Helsinki University Central Hospital, Helsinki, Finland. patrik.lassus@helsinki.fi
Insights
Higher levels of prostacyclin metabolite (6-keto-prostaglandinF(1 alpha)) in preterm infants correlated with less respiratory distress. Thromboxane metabolite (thromboxane B(2)) was linked to maturity, not directly to respiratory distress severity.
Area of Science:
- Neonatal Medicine
- Pulmonary Physiology
- Eicosanoid Biology
Background:
- Prostacyclin (PGI(2)) and thromboxane A(2) (TxA(2)) play roles in lung pathology.
- PGI(2) may protect against hyperoxic lung injury in newborns.
- TxA(2) may contribute to bronchopulmonary dysplasia (BPD) development.
Purpose of the Study:
- To investigate the relationship between pulmonary PGI(2) and TxA(2) levels and respiratory distress in preterm infants.
- To analyze these relationships during the early postnatal period.
Main Methods:
- Quantified 6-keto-prostaglandinF(1 alpha) (PGI(2) metabolite) and thromboxane B(2) (TxA(2) metabolite) in tracheal aspirates.
- Analyzed 284 samples from 48 preterm infants (gestational age: 27.4±2.1 weeks; birth weight: 959±334 g) within the first 12 postnatal days.
- Utilized radioimmunoassays for metabolite quantification.
Main Results:
- Mean concentrations: 6-keto-prostaglandinF(1 alpha) 414±31 pg/ml; thromboxane B(2) 418±37 pg/ml.
- 6-keto-prostaglandinF(1 alpha) correlated positively with gestational age, birth weight, and initial arterial-alveolar oxygenation ratio.
- Negative correlations found between 6-keto-prostaglandinF(1 alpha) and inspired oxygen, mechanical ventilation duration.
- Indomethacin treatment associated with lower 6-keto-prostaglandinF(1 alpha) but not thromboxane B(2).
- Thromboxane B(2) positively correlated with gestational age, birth weight, initial oxygenation ratio, and inversely with ventilation duration.
Conclusions:
- In preterm infants, elevated pulmonary 6-keto-prostaglandinF(1 alpha) is linked to reduced respiratory distress severity and greater maturity.
- Pulmonary thromboxane B(2) levels are more strongly associated with infant maturity than with respiratory distress.
- These findings highlight the differential roles of PGI(2) and TxA(2) metabolites in neonatal respiratory health.
Background:
Prostacyclin (PGI(2)) and thromboxane A(2) (TxA(2)) may take part in lung pathology; high concentrations of PGI(2) may protect newborn rabbits against hyperoxic lung injury, and TxA(2) may participate in the development of bronchopulmonary dysplasia (BPD).
Aims:
To examine in small preterm infants, the relationship between pulmonary PGI(2) and TxA(2) and respiratory distress during the early postnatal period.
Methods:
The stable metabolite of prostacyclin, 6-keto-prostaglandinF(1 alpha), and that of thromboxane A(2), thromboxane B(2), were quantified by radioimmunoassays in 284 samples of tracheal aspirates from 48 infants (GA: 27.4+/-2.1 week, BW 959+/-334 g) during the first 12 postnatal days.
Results:
Mean concentration of 6-keto-prostaglandinF(1 alpha) was 414+/-31 pg/ml (mean+/-S.E.M.), and of thromboxane B(2) was 418+/-37 pg/ml. Correlations existed between 6-keto-prostaglandinF(1 alpha) and gestational age, birth weight, and the initial arterial-alveolar oxygenation ratio. Negative correlations existed between 6-keto-prostaglandinF(1 alpha) and both mean inspiratory oxygen and duration of mechanical ventilation. Indomethacin treatment was associated with lower pulmonary 6-keto-prostaglandinF(1 alpha), but not with lower TxB(2). Thromboxane B(2) correlated positively with gestational age, birth weight, and initial arterial-alveolar oxygenation ratio, and inversely with duration of mechanical ventilation.
Conclusions:
In preterm infants, higher pulmonary 6-keto-prostaglandinF(1 alpha) was associated with less severe respiratory distress and with maturity, whereas thromboxane B(2) was associated more strongly with maturity than with respiratory distress.