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Related Experiment Videos

Voiding function in pregnancy and puerperium.

H P Dietz1, C J Benness

  • 1Royal Prince Alfred Hospital, Sydney, Australia. hpdietz@bigpond.com

International Urogynecology Journal and Pelvic Floor Dysfunction
|September 29, 2004
PubMed
Summary

Pregnancy alters bladder function, with decreased voided volumes and increased maximum (MFR) and average flow rate (AFR) centiles observed. These changes, particularly in MFR and AFR, correlate with bladder neck mobility shifts during and after pregnancy.

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Area of Science:

  • Urogynecology
  • Obstetrics
  • Female Pelvic Medicine

Background:

  • Bladder function undergoes significant physiological changes during pregnancy.
  • Understanding these alterations in nulliparous women is crucial for establishing normative data.

Purpose of the Study:

  • To prospectively investigate changes in voiding function in a cohort of nulliparous women during pregnancy and postpartum.
  • To correlate urodynamic parameters with bladder neck mobility.

Main Methods:

  • Prospective study of 200 nulliparous women with assessments during pregnancy and postpartum.
  • Evaluation of flowmetry, ultrasound estimation of residual urine, and translabial ultrasound of bladder neck mobility.
  • Calculation of maximum (MFR) and average (AFR) flow rate centiles using Liverpool nomograms.

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Main Results:

  • Voided volumes decreased significantly during pregnancy (253ml to 180ml) and returned to near baseline postpartum (198ml).
  • MFR and AFR centiles increased progressively from early pregnancy through postpartum (p<0.001).
  • Increases in MFR centiles showed weak but significant correlations with changes in bladder neck mobility parameters.

Conclusions:

  • Pregnancy and childbirth lead to significant increases in maximum and average flow rates in nulliparous women.
  • These urodynamic changes are weakly associated with alterations in bladder neck mobility.
  • Findings provide valuable insights into the evolving voiding dynamics throughout the childbearing continuum.