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Related Experiment Videos

The voiding pattern of healthy preterm neonates.

U Sillén1, E Sölsnes, A L Hellström

  • 1Department of Pediatric Surgery, University Hospital, Ostra, Göteborg, Sweden.

The Journal of Urology
|December 22, 1999
PubMed
Summary

Preterm newborns exhibit immature voiding patterns, with more interrupted voidings and sleep-related urination than full-term infants. This suggests delayed detrusor-sphincter coordination in premature infants.

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Area of Science:

  • Neonatal physiology
  • Pediatric urology
  • Developmental biology

Background:

  • Understanding infant voiding habits is crucial for assessing urinary tract development.
  • Previous studies focused on full-term newborns, leaving a gap in knowledge for preterm infants.

Purpose of the Study:

  • To investigate the free voiding pattern in healthy preterm neonates.
  • To compare voiding habits of preterm infants with those of full-term infants.

Main Methods:

  • Evaluated 19 healthy preterm newborns (11 male, 8 female) at a mean postmenstrual age of 32 weeks.
  • Utilized a 4-hour voiding observation method in the neonatal ward.
  • Assessed voiding frequency, volume, interrupted voiding, and residual urine.

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Main Results:

  • Preterm neonates averaged 1 void per hour, with 53% bladder capacity voided volume.
  • Interrupted voiding occurred in 58% of instances, with mean residual urine at 11% bladder capacity.
  • Two-thirds of voiding occurred during sleep, with limited awake time (mean 17 minutes).

Conclusions:

  • Preterm infants display more interrupted voidings, indicating immature detrusor-sphincter coordination.
  • Increased voiding during sleep further suggests a less mature voiding pattern in preterm newborns.
  • Findings highlight developmental differences in urinary control between preterm and full-term infants.