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Urodynamic Techniques

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Urodynamics

Abstract

The evolution of urodynamic units may be traced to the interest in the hydrodynamics of micturition which had been simmering since the early cystometric studies of the nineteenth century, but it was the advent of electronics that acted as the catalyst for modern urodynamic studies. In 1956 von Garrelts described a simple practical apparatus, using a pressure transducer, to record the volume of urine voided as a function of time and thus, by derivation, urine flow rates could be calculated. His work stimulated a revival of interest in cystometry, because it was then possible to record the bladder pressure and the urine flow rate simultaneously during voiding. As a result, normal and obstructed micturition could be defined in terms of these measurements (Claridge 1966) and a formula was applied to express urethral resistance (Smith 1968). Enhorning (1961) measured bladder and urethral pressures simultaneously with a specially designed catheter and he termed the pressure difference between them the urethral closure pressure. He demonstrated that a reduction of intraurethral pressure occurred several seconds prior to detrusor contraction at the initiation of voiding. This appeared to be related to the relaxation of the pelvic floor, thus confirming the EMG studies of Franksson and Peterson (1955).

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  1. Bristol Urological Institute, Southmead Hospital, BS10 5NB, Westbury-on-Trym, Bristol, UK

    Paul Abrams MD, FRCS

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  1. Paul Abrams MD, FRCS
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© 1997 Springer-Verlag London

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Abrams, P. (1997). Urodynamic Techniques. In: Urodynamics. Springer, London. https://doi.org/10.1007/978-1-4471-3598-2_3

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  • DOI: https://doi.org/10.1007/978-1-4471-3598-2_3

  • Publisher Name: Springer, London

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