Summary
Pressure-flow studies of voiding contain information about urethral resistance or obstruction and about the detrusor contraction or contractility. A fundamental problem, discussed in this paper, is how to disentangle these two. A second, more difficult, problem is how to evaluate them in a simple, clinically useful way. Plots of detrusor pressure against flow rate during the course of voiding offer a helpful adjunct to conventional urodynamic curves showing changes with time. Many ways of assessing urethral obstruction from these plots have been proposed that have somewhat differing aims but, in practice, produce rather similar results. Agreement on a standard method is needed to allow the comparison of results obtained in different centers. Detrusor contractility has been less extensively studied but methods for assessing it are available.
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References
Abrams PH, Griffiths DJ (1979) The assessment of prostatic obstruction from urodynamic measurements and from residual urine. Br J Urol 51:129–134
Abrams P, Blaivas J, Nordling J, Griffiths DJ, Kondo A, Koyanagi T, Neal D, Schäfer W, Yalla S (1993) The objective evaluation of bladder outflow obstruction. In: Cockett ATK, Khoury S, Aso Y, Chatelain C, Denis L, Griffiths K, Murphy G (eds) Proceedings of the 2nd International Consultation on Benign Prostatic Hyperplasia. Scientific Communication International, Jersey, pp 151–209
Griffiths DJ (1980) Urodynamics: the mechanics and hydrodynamics of the lower urinary tract. Hilger, Bristol
Griffiths DJ (1991) Assessment of detrusor contraction strength or contractility. Neurourol Urodyn 10:1–18
Griffiths DJ, Constantinou CE, Van Mastrigt R (1986) Urinary bladder function and its control in healthy females. Am J Physiol 251:R225-R230
Hill AV (1983) The heat of shortening and the dynamic constants of muscle. Proc R Soc London [Biol] 126:136–193
International Continence Society (1988) Standardisation of terminology of lower urinary tract function. Neurourol Urodyn 7:403–426
Schäfer W (1983) The contribution of the bladder outlet to the relation between pressure and flow rate during micturition. In: Hinman F Jr (ed) Benign prostatic hypertrophy. Springer, New York Berlin Heidelberg, pp 470–496
Schäfer W (1990) Basic principles and clinical application of advanced analysis of bladder voiding function. Urol Clin North Am 17:553–566
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Griffiths, D. Basics of pressure-flow studies. World J Urol 13, 30–33 (1995). https://doi.org/10.1007/BF00182663
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DOI: https://doi.org/10.1007/BF00182663