Measurement of protein flux with positron emission tomography in neonates
- Division of Newborn Medicine, Edward Mallinckrodt Department of Pediatrics, Washington University School of Medicine and St Louis Children’s Hospital, St Louis, Missouri
- Dr Aaron Hamvas, Division of Newborn Medicine, St Louis Children’s Hospital, St Louis, MO 63110 USA.
- Accepted 14 August 1998
Abstract
AIM To determine whether abnormal transvascular protein flux can be measured with positron emission tomography (PET) in neonates with respiratory distress syndrome (RDS).
METHODS Fourteen infants with normal gas exchange (non-RDS group) underwent one PET measurement and 12 infants with RDS (the RDS group) underwent two measurements of protein flux, as determined by the pulmonary transcapillary escape rate for68Gallium labelled transferrin (PTCER).
RESULTS The mean PTCER for the RDS infants (132 ± 39 10-4/min) was significantly greater than that for infants without RDS (75 ± 27 10-4/min). PTCER did not change between measurements in the infants with RDS, including five who received and responded to surfactant replacement between the two scans.
CONCLUSIONS Increased transvascular flux of large molecular weight proteins complicates RDS in preterm infants. PET provides a tool with which to evaluate the processes that contribute to pulmonary dysfunction in neonates.
