[Flow index: a substitute for uroflow nomograms?].

: One hundred and twenty-nine flowmetries from an equal number of male patients with urinary obstructive symptoms have been analyzed, and the data provided by Siroky's nomogram compared to the flow ratios. Flow ratio was considered compatible with obstruction if below 0.80, which in turn correlated to -2 DE in Siroky's nomogram. Agreement between both parameters was noted in 95% cases (p < 0.05). The use of a flow ratio as a substitute for Siroky's nomogram to evaluate urinary obstructive disease would be justified by the easiness of interpretation, since it avoids translation of maximum flow and mean flow data to a plot. Flowmetry should only be considered determinant with clearly obstructive values.