Urological Research

, Volume 22, Issue 4, pp 235–238 | Cite as

Long-term changes in urodynamic studies of voiding in the elderly

  • D. Griffiths
  • G. Harrison
  • K. Moore
  • P. McCracken
Original Paper


Urodynamic studies were conducted in 80 incontinent elderly patients (27 men and 53 women; mean age, 77 years) and repeated 2–4 weeks later after patients had been subject to interventions. Interpretable voiding studies were performed in 84% of sessions. Interpretable initial and repeat studies were performed in 74% of patients. For detrusor pressure at maximum flow the intra-individual, between-sessions variability was ±11.7 cm H2O (SD) and the initial-repeat correlation coefficient was 0.61. For maximum flow rate the corresponding figures were ±4.7 ml/s and 0.44. Mean residual urine volume was 195 ml, with a between-sessions variability of ±113 ml (SD). These results suggest that there is substantial long-term variability in voiding function, including urethral resistance. Of the men, 5% showed a change in obstruction classification (unobstructed/obstructed) between sessions. This variability and the modest proportion of interpretable studies should be taken into account when assessing urethral obstruction and designing clinical trials.

Key words

Urethral obstruction Detrusor pressure Urine flow rate Pressure/flow studies Clinical trials 


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • D. Griffiths
    • 1
  • G. Harrison
    • 2
  • K. Moore
    • 2
  • P. McCracken
    • 3
  1. 1.Urodynamics UnitEdmonton General HospitalEdmontonCanada
  2. 2.Department of Applied Sciences in MedicineUniversity of AlbertaEdmontonCanada
  3. 3.Department of GeriatricsEdmonton General HospitalEdmontonCanada

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