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Bladder function in healthy neonates and its development during infancy.

U Sillén1

  • 1Department of Paediatric Surgery/Urology Section, Queen Silvia Children's Hospital, Göteborg, Sweden.

The Journal of Urology
|November 7, 2001
PubMed
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Neonatal bladder function involves frequent, small voids and often interrupted voiding due to immature sphincter-detrusor coordination. This physiological dyscoordination, including detrusor hyperactivity, resolves before toilet training.

Area of Science:

  • Pediatric Urology
  • Neonatal Physiology
  • Urodynamics

Background:

  • Neonatal bladder function is not fully understood.
  • Previous concepts viewed voiding as an automatic reflex.
  • Developmental changes in bladder control are significant.

Purpose of the Study:

  • To describe bladder function in healthy neonates.
  • To detail the development of bladder control during infancy.
  • To analyze voiding characteristics and urodynamic findings.

Main Methods:

  • Review of free voiding studies in neonates and infants.
  • Utilized 4-hour voiding observation.
  • Incorporated urodynamic studies.

Main Results:

Related Experiment Videos

  • Healthy neonates exhibit small, frequent voids; 30% show interrupted voiding, linked to sphincter-detrusor dyscoordination.
  • Interrupted voiding, seen in 60% of preterm infants, resolves before toilet training.
  • Neonatal bladders show hyperactivity, low capacity, and high voiding pressures, suggesting cortical regulation rather than a purely automatic reflex.

Conclusions:

  • Neonatal bladder function is neurally regulated with cerebral cortex connections.
  • Physiological dyscoordination, including detrusor hyperactivity, characterizes the neonatal bladder.
  • Voiding in neonates is a disruptive reflex, not a conscious or voluntary act.