AbstractThe most significant changes in voiding patterns in male subjects with prostatism occur toward the end of the stream rather than at the beginning or at peak flow. The flow curve shape that is heavily weighted toward endstream events flattens and can be expressed mathematically as the ratio of peak flow to time of voiding. The flow rate at the end of voiding deteriorates more in the obstructed patient than in the normal, so that terminal flow is a better discriminator of pathology than peak flow. The terminal velocity is also sensitive to minor changes in outflow resistance. Values of terminal flow rate in the obstructed male were scattered below 8 ml/s. Terminal velocity in obstructed males was usually less than 85 cm/s with an overlap zone between 85 and 100 cm/s. The studies were done on a total of 35 subjects, 12 normal men and 23 patients.
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