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Plasma N-terminal proBNP Concentrations and Patent Ductus Arteriosus in Preterm Babies

This study has been completed.
National Health Service, United Kingdom
Medical Research Council
Information provided by:
St George's, University of London Identifier:
First received: July 28, 2008
Last updated: September 17, 2009
Last verified: September 2009

Premature babies are affected by a condition known as "patent ductus arteriosus" in which the ductus arteriosus (a normal structure) fails to close after birth as it should. A very large ductus can put extra strain on the heart and lungs, making the baby's breathing dependent on a mechanical ventilator. Attending physicians can close the duct with medical\or surgical treatment but assessing whether this is justified can be difficult. The physician usually bases this decision on assessment of the baby's general condition and an ultrasound evaluation of the heart (called an "echocardiogram") but the last is particularly dependent on availability of skilled operators.

The investigators have examined whether blood levels of a hormone called B-type natriuretic peptide (Nt pro-BNP)in the first week of life predict the need to treat a ductus arteriosus. This hormone is produced by the heart if it is under strain. If the test is helpful it could reduce dependence of physicians on echocardiography by skilled operators.

Babies who were recruited had blood samples collected on days 1, 2, 3 and 7 for measurement of Nt pro-BNP. Each baby also had an echocardiogram performed between the fifth and seventh day of life. Decisions about treatment of the duct were made by attending physicians independent of the study. Physicians, investigators and echocardiographers were blinded to knowledge of the Nt pro-BNP concentration. Nt pro-BNP was also measured before and after treatment in all babies who had a PDA treated and echocardiography performed to confirm closure.

Receiver operating characteristics (ROC) curves were used to assess the predictive value of Nt pro-BNP for samples collected at each time point. The investigators also compared the Nt pro-BNP levels in samples collected before and after treatment to assess the usefulness of Nt pr-BNP as an indicator of duct closure.

Ductus Arteriosus, Patent

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: A Study of the Value of Plasma N-terminal proBNP Concentrations for Diagnosing Patent Ductus Arteriosus in Preterm Babies.

Resource links provided by NLM:

Further study details as provided by St George's, University of London:

Enrollment: 102
Study Start Date: May 2005
Study Completion Date: June 2007
Primary Completion Date: June 2007 (Final data collection date for primary outcome measure)
Treated PDA
Infants who had a PDA which the attending physicians treated medically or surgically.


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Preterm infants in a tertiary level neonatal intensive care unit

Inclusion Criteria:

  • Preterm babies under 34-weeks gestation admitted to the neonatal intensive care unit

Exclusion Criteria:

  • Known structural heart abnormality other than PDA
  Contacts and Locations
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Please refer to this study by its identifier: NCT00725647

Sponsors and Collaborators
St George's, University of London
National Health Service, United Kingdom
Medical Research Council
Principal Investigator: Santhanakrishnan Ramakrishnan, MB MRCPCH St George's Healthcare NHS Trust
Study Director: Anthony F Williams, MB FRCPCH St George's, University of London
  More Information

Responsible Party: Dr Santhanakrishnan Ramakrishnan (Principal investigator), St George's Healthcare NHS Trust Identifier: NCT00725647     History of Changes
Other Study ID Numbers: 04/Q0803/98
Study First Received: July 28, 2008
Last Updated: September 17, 2009

Keywords provided by St George's, University of London:
N terminal B type natriuretic peptide
atrial natriuretic peptides
preterm infant

Additional relevant MeSH terms:
Ductus Arteriosus, Patent
Heart Defects, Congenital
Cardiovascular Abnormalities
Cardiovascular Diseases
Heart Diseases
Congenital Abnormalities processed this record on August 21, 2017