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Disturbed surface properties in preterm infants with pneumonia.
M Rüdiger1, W Friedrich, B Rüstow
1Otto Heubner Center for Pediatrics, Clinic of Neonatology, Charité Campus Mitte, Hospital of Humboldt University, Berlin, Germany. mario.ruediger@rz.hu-berlin.de
Biology of the Neonate
|February 27, 2001
Summary
Congenital pneumonia in preterm infants can disrupt lung surfactant function, even with adequate surfactant amounts. This suggests surfactant substitution therapy may benefit these infants with respiratory insufficiency.
Area of Science:
- Neonatology
- Pulmonology
- Biochemistry
Background:
- Congenital pneumonia in preterm infants frequently causes respiratory insufficiency.
- Mechanical ventilation is often required for these infants.
- The role of surfactant dysfunction in congenital pneumonia is not well understood.
Purpose of the Study:
- To investigate whether congenital pneumonia in preterm infants is linked to surfactant inhibition or deficiency.
- To assess surfactant properties in infants with pneumonia compared to other respiratory conditions.
Main Methods:
- Determined the lecithin and sphingomyelin (L/S) ratio and minimal surface tension in tracheal aspirates.
- Analyzed samples from preterm infants with pneumonia, respiratory distress syndrome (RDS), and wet lung, alongside healthy term infants.
- Utilized established cut-off values for L/S ratio and surface tension to identify surfactant deficiency and inhibition.
Main Results:
- Infants with RDS showed significantly lower L/S ratios and higher surface tension compared to healthy and wet lung groups.
- Infants with pneumonia had a lower L/S ratio than healthy and wet lung groups, but higher than the RDS group.
- While 81% of pneumonia infants had sufficient surfactant amounts, only 21% exhibited appropriate surface tension, indicating disturbed surface properties.
Conclusions:
- Preterm infants with congenital pneumonia requiring mechanical ventilation exhibit disturbed lung surface properties despite sufficient surfactant quantities.
- Surfactant inhibition, rather than deficiency, appears to be a key issue in these cases.
- Surfactant substitution therapy could be a potential beneficial treatment for respiratory insufficiency in congenital pneumonia.