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Influence of pudendal nerve blockade on stress relaxation in the female urethra

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The urethral pressure decay following a sudden and sustained dilatation corresponds to stress relaxation. Urethral stress relaxation can be described by the equation Pt = Pequ + P alpha e-t/tau alpha + P beta e-t/tau beta, where Pt is the pressure at time t, Pequ is the equilibrium pressure after dilatation, P alpha and P beta are pressure decay, and tau alpha and tau beta are time constants. The time constants have previously proved independent of the way the dilatation is performed. The urethral stress relaxation obtained in 10 healthy women before and after pudendal nerve blockade was analysed by the mathematical model and the pressure parameters and time constants determined. The fast time constant, tau beta, was reduced by the nerve blockade, whereas tau alpha was unaffected, however, both P alpha and P beta were reduced. No single stress relaxation parameter can therefore be related to the muscle or the connective tissue components. The method may prove useful in the further evaluation of the closure function of the urethra with special reference to the pathophysiology of stress urinary incontinence.
Original languageEnglish
JournalNeurourology and Urodynamics
Volume15
Issue number1
Pages (from-to)31-6
Number of pages6
ISSN0733-2467
DOIs
Publication statusPublished - 1996

    Research areas

  • Adult, Anesthetics, Local, Autonomic Nervous System, Drug Combinations, Elasticity, Female, Humans, Lidocaine, Muscle Relaxation, Muscle, Skeletal, Nerve Block, Norepinephrine, Pressure, Stress, Mechanical, Sympathomimetics, Urethra, Urinary Incontinence, Stress

ID: 38645944