1) The author observed the influence of transurethral resection for bladder neck obstruction upon renal function by means of clearance tests and many other renal function tests; besides compared it with those of prostatectomy and transurethral electrocoagulation.
2) After TUR, renal function decreases temporarily, and reverts to the pre-operative level in 10 days in the cases of prostatic hypertrophy, and in 5-7 days in the cases of prostatism.
3) Renal function of the patients who have had prostatectomy shows a much greater decrease at the postoperative stage than in the cases of TUR, and it takes about 20 days for it to recover.
4) Among renal functions after TUR, RPF shows the most remarkable decrease; in many cases it reveals a markedly low value in spite of the recovery of GFR; therefore F F increases in general.
5) Disturbance of renal function is caused by many factors as well as other surgical procedures, and above all the author attaches importance to the following: the strong, frequent filling and dilatation of bladder, bleeding during and after TUR, and stimulation by use of high frequency.
6) If a proper indication is selected, TUR is suitable for the aged, bceause the decrease of renal function by TUR is very little compared with by open operation.
7) It is important to put tests to renal function for bladder neck obstruction before and after operation, and at the time of testing the author recommends the urea clearance test and PSP test avoiding other intricate ones.
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