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Position-related changes in voiding dynamics in men

M Riehmann1, W H Bayer, P J Drinka

  • 1Department of Surgery, University of Wisconsin, UW Hospital and Clinics, Madison, USA.

Urology
|October 8, 1998
PubMed
Summary
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Uroflowmetry and postvoid residual urine volume (PVR) in men show decreased urinary flow rates in the recumbent position. This may predispose elderly, bedridden individuals to urinary tract infections due to altered voiding dynamics.

Area of Science:

  • Urology
  • Geriatrics
  • Physiology

Background:

  • Altered bladder function in the supine position may contribute to urinary tract infections in institutionalized elderly men.
  • Understanding position-related changes in voiding dynamics is crucial for geriatric care.

Purpose of the Study:

  • To investigate changes in uroflowmetry and postvoid residual urine volume (PVR) in men across different voiding positions.
  • To assess the potential link between supine voiding and increased risk of urinary tract infections in the elderly.

Main Methods:

  • Urodynamic studies including uroflowmetry and transabdominal ultrasonic bladder scanning for PVR measurement.
  • Evaluation of healthy men and nursing home residents in both standing and recumbent positions.
  • Statistical analysis to determine significant differences (P < 0.05).

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Main Results:

  • A statistically significant decrease in peak urinary flow rate was observed in the recumbent position compared to the standing position for all participants.
  • No significant difference in PVR was found in healthy men, but a statistically significant increase was noted in nursing home residents when voiding recumbently.
  • Mean peak flow rates were significantly lower in the recumbent position across all study groups.

Conclusions:

  • Urinary flow rate is reduced when voiding in a recumbent position.
  • Bedridden elderly individuals may have an increased susceptibility to urinary tract infections due to these altered voiding dynamics.
  • Further research is recommended to explore these findings and their clinical implications.