The technique of synchronous pressure-flow studies requires the use of either a transurethral or a suprapubic catheter. Although the flow is impaired by the presence of catheter, the use of transurethral catheter can eliminate unnecessary
cystostomy
procedure. We evaluated the effect of urethral catheter on the uroflow. The maximal and average urinary flow rates of healthy volunteer o 24 male and 7 female were measured in the presence and absence of a 5Fr. and 8Fr. urethral catheter. A
comparison
of these flow rates showed that those measured with the catheter in situ were lower than those in the absence of a catheter. There was an insignificant decrease in maximal flow rate(MFR) from 20.8±6.3(ml/sec) to 20.4±4.9 and 19.0±5.2 with 5Fr.
and
8Fr. urethral catheter, respectively. The average flow rate(FR0 was also decreased insignificantly from 10.7±3.8(ml/sec) to 9.5±2.3 and 8.8±2.3 with 5Fr. and 8Fr. urethral catheter, respectively. The followings are correlation formulae of AFR
and MFR
according to diameter of ruethral catheter in situ. MFR=0.79Xmfr(5Fr.) +4.71 (R square=10.37), MFR=0.74xaMFR (8Fr.) +6.92 (R square=0.32), AFR=1.0Xafr(5Fr.) +1.48(R square=0.35), AFR=1.23Xafr(8Fr.) -0.15 (R square=0.59) (MFR : maximal flow rate,
AFR :
average flow rate).
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