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Biomedical subjects

S Hirabayashi

Publications and source records attributed to S Hirabayashi.

At least 91 records · Page 5Linked to original sources
PubMed1989

Long-term results of transurethral lithotripsy with the rigid ureteroscope: injury of intramural ureter.

We treated 208 patients with ureteral calculi via transurethral lithotripsy using the rigid ureteroscope between March 1985 and April 1988. A total of 220 ureteroscopic procedures was performed in 217 ureters. Complete removal was achieved after 180 procedures (81.8%) and incomplete removal was achieved after 9 (4.1%). In 31 cases (14.1%) the stone could not be removed because of various reasons. Ureteral disruption was observed in 1 case (0.5%), which was treated successfully with reconstruction. Ureteral perforation occurred in 15 cases (6.8%) and was treated successfully except for 1 patient (0.5%) in whom ureteral stricture was observed requiring reconstruction. From long-term followup of sequential excretory urography and voiding cystography, mild stricture at the vesical end of the ureter was noted in 3 of 86 ureters (3.5%) and vesicoureteral reflux was noted in 7 of 73 (9.6%). These results indicate that the injury to the intramural ureter might arise from the passage of the ureteroscope resulting in stricture and vesicoureteral reflux.

Adolescent↗
PubMed1989

Experimental studies on complete global brain ischemia using the isohistogenic infantile head transplant model in Lewis rats.

A new experimental model is presented, using isohistogenic Lewis rats and microsurgical techniques. Transplantation of the head and forelimbs of the infantile rat was done to the groin of an adult rat. The goal was to study the effects of ischemia on brain tissue. This model also proved useful for other experiments in studies of facial and cranial bone growth. The model presented proved efficient for the study goals, and long-term experiments were possible. The maximum ischemia time tolerated by brain tissue was found to be somewhere between 60 min and 120 min.

Animals↗
PubMed1989

[Reconstructive surgery of obstructive disease of the upper urinary tract].

Efficacy of reconstructive surgery for the obstructive disease of the upper urinary tract was evaluated. Reconstructive surgery was performed in 75 units of the urinary drainage system of 72 patients between July, 1977 and December, 1987. 44 patients were male and 28 were female. The patients ranged in age 1 to 71, mean +/- S.D. being 43 +/- 14 years old. Original diseases were postoperative scar, scar due to the calculi, injury, retroperitoneal fibrosis, ureteritis, tuberculosis, amyloidosis and multiple ureteral diverticulum. The surgery consisted of ureterocalicostomy, renal descensus, descent of right renal vein, uretero-ureterostomy, ureteroneocystostomy (to the dome of the bladder), psoas bladder hitch and renal autotransplantation. Renal autotransplantation was chosen instead of ileal substitution to preserve the continuity of the urinary drainage system, when the upper urinary tract was extensively damaged. The obstructive change of the upper urinary tract improved or disappeared in 66 of 75 units. However, it persisted in 9 units, which were treated with ureterocalicostomy (wrong technics; in 4 units), ureteroureterostomy (wrong choice of the procedure; in 4 units) and autotransplantation (cessation of anti tbc drugs; in 1 unit). In 3 of these 9 units, additional reconstructive surgery was necessary. One patient who was treated with autotransplantation, died of massive bleeding from rupture of arterial anastomosis on 14th postoperative day. No other life-threatening complications were observed. Deterioration of the renal function was observed in two severely damaged kidneys which were performed autotransplantation, although the obstructive change of their urinary tract completely disappeared.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1988

An experimental study of craniofacial growth in a heterotopic rat head transplant.

In order to examine whether or not facial bones are themselves able to regulate their own growth, we devised a new experimental model in which we transplanted the whole head of an infant rat to the body of an isohistogeneic adult rat by means of microvascular anastomoses. The advantage of this model is that the transplanted head has neither scars nor any moving soft tissues that could modify growth around facial bones. Using this model, we conducted a study of the nasomaxillary region that has led us to conclude that facial bones do in fact regulate their own growth. The results also suggested that facial bone sutures play a more active role in the growth process than presently suspected.

Animals↗
PubMed1988

[Electrohydraulic lithotripsy of upper urinary tract calculi].

Electrohydraulic lithotripsy (EHL) was employed for the treatment of 35 patients with upper urinary tract calculi. The stones in 14 patients with renal and upper ureteral calculi were disintegrated by a 9Fr probe and the rigid nephroscope. Twelve patients with upper or middle ureteral calculi were treated using a 5Fr probe and the fiberscope. The stones in 9 patients with lower ureteral calculi were removed by a 5Fr probe and the rigid ureteroscope. Although small residual stones were observed in 15 patients (43%), all the stones were fragmented satisfactorily except in two patients. The complications due to EHL were observed in eight patients (23%). The most frequent complication was the ureteral injury which was observed in 6 patients. In 2 of these patients the stone migrated out from the ureter. However, all the cases of ureteral injury were healed by the conservative therapy such as by indwelling the stent catheter without ureteral stricture.

Adult↗
PubMed1988

[The diffusion of enoxacin into the prostatic fluid in the chronic prostatitis patient].

To examine the diffusion of enoxacin into the prostatic fluid of patients with chronic prostatitis, the serum level and the expressed prostatic secretion (EPS) level of enoxacin were measured. Enoxacin was administered orally at a dose of 200 mg in 24 chronic prostatitis patients. One hour later, blood and EPS samples were taken. The level of enoxacin was measured by the bioassay using E. coli (Kp strain). In 24 patients, the mean value of enoxacin was 1.24 micrograms/ml in the serum and 0.69 micrograms/ml in the EPS. The mean ratio of EPS/serum was 0.58. These results indicated that enoxacin diffused well into the prostatic fluid of chronic prostatitis patients.

Adult↗
PubMed1987

Treatment of recurrent subareolar abscess.

Recurrent subareolar abscess is an infrequent but troublesome disease of the breast among young women. Recent experience with 5 patients indicated that successful treatment of recurrent subareolar abscess requires excision of the diseased ducts and necrotic cavity, including the inverted section of the nipple. The operative procedure described herein allows us to radically manage recurrent subareolar abscess and at the same time leave a nipple with a good cosmetic appearance.

Abscess↗
PubMed1987

Neurilemoma of the ansa cervicalis.

A case of neurilemoma originating from the ansa cervicalis is presented. Available literature is reviewed, and the rarity of the tumor is discussed. It is believed that some cases of neurilemoma in which the nerve of origin was not identified may in reality have originated from the ansa cervicalis.

Child↗
PubMed1987

[Natural cell-mediated cytotoxicity of kidney allograft recipients].

Natural cell-mediated cytotoxicity (NCMC) displayed by peripheral blood mononuclear cells of kidney allograft recipients was examined against K562 cells to demonstrate the kinetics of NCMC activity in the posttransplant period. On 44 kidney allograft recipients 301 NCMC assays were performed between 1 and 84 months after transplantation. These patients were treated with the conventional immunosuppressive treatment consisting of steroid and azathioprine. NCMC activity sharply decreased after transplant surgery. A decreased NCMC activity continued during the first 6 months and the mean NCMC value was 19.2 +/- 14.1. In the second 30 months, NCMC activity also constantly decreased, almost to 10. It was lower than that of the first 6 months (P less than 0.01). After 37 months, some patients restored a normal NCMC activity and others showed a decreased NCMC activity. The mean value was 27.4 +/- 20.6 in the third 48 months. The depression of NCMC activity might be caused by the large dose of steroid and azathioprine in the first 6 months. In the third 48 months, NCMC activity might be dependent on the dosage of azathioprine alone. The activation of NCMC activity might be caused by acute rejection crisis.

Adolescent↗