The difference between urethral pressures measured along the anterior wall and those measured along the posterior wall was found to increase markedly as the stiffness of the catheter was increased and to increase by a greater amount if the weight of the catheter was increased. A method of grading the stiffness of catheters is proposed and the use of stiff catheters in past reports of urethral measurements is discussed.
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Plevnik et al. (1985) studied this question.
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