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Biomedical subjects

R I Hansen

Publications and source records attributed to R I Hansen.

At least 19 recordsLinked to original sources
PubMed1995

The upper arm arterio-venous fistula--an alternative for vascular access in haemodialysis.

Forty-eight consecutive arteriovenous fistulae of the upper arm constructed in 44 patients between 1983 and 1987 were reviewed. The median observation time was 8.5 months (range 1 day-65 months). The overall patency rate for fistulae used for haemodialysis (early failures excluded) was 50% after one year and 38% after two years. However, only six (18.7%) of the used fistulae stopped because of thrombosis. The total number of thromboses was nine (19.6%). The main cause of discontinuance of fistulae was a high number of deaths (n = 22), presumably a result of a high median age of 62 years. Early failure rate was seven of 46 (15.2%); in three cases (6.5%) this was caused by thrombosis. The results are compared to other alternatives for radiocephalic fistulae and the difficulties of comparisons are discussed. It is concluded that the upper arm arteriovenous fistula can serve as a second choice, when a radio-cephalic fistula fails.

Adolescent↗
PubMed1990

[Extracorporeal shock wave treatment of urinary calculi. Results after treatment of the first 207 patients at the Copenhagen City Stone Center with a second generation lithotriptor].

Early experience of extracorporeal shock wave lithotripsy (ESWL) using a second generation lithotriptor (Siemens Lithostar) is reported. Two hundred and seven patients underwent 272 treatments for 291 stones. There were 259 renal calculi, including three staghorn calculi and 32 ureteric calculi. Treatments were performed under local analgesia (78%) or epidural or general anaesthesia (22%) when invasive procedures had to be done in connection with the treatment. Stone fragmentation was achieved with 2,487 +/- 1,262 shocks. The first month stone clearance rate was 43%, 24% had fragments less than 6 mm and 33% had residual stones. The same figures after three and six months were 57%, 23% and 20% and 71%, 23% and 6%, respectively. Septicaemia occurred in four patients and cardiac arrhythmia in 24 patients (12%); no serious intra- or perirenal heamatomas were registered. In 7% additional procedures were required, seven patients had residual stones removed at an open operation. The Lithostar is an effective second generation lithotriptor which can be used for renal, staghorn and ureteric calculi in situ in all three segments without stone manipulation prior to ESWL.

Adolescent↗
PubMed1989

LHRH analogue as a depot preparation (Zoladex) in the treatment of advanced carcinoma of the prostate followed by orchiectomy as a second line therapy--a phase II study.

An LHRH agonist, Zoladex, was employed as a monthly depot in 56 previously untreated patients with advanced carcinoma of the prostate. Of 53 evaluable patients, 27 achieved partial remission and 7 were stable. Median duration of response was 10 months. A favorable subjective response was attained in 68% of the patients. During treatment, serum testosterone was in the castrate range in all patients except five. Possible explanations for this escape phenomenon are discussed. No toxicity was observed and treatment was well tolerated in all patients. Thirty-two patients underwent bilateral orchiectomy following treatment failure of Zoladex. In one patient partial remission according to protocol criteria was recorded. Treatment with LHRH agonists seems safe and may serve as an alternative to conventional hormonal treatment of advanced carcinoma of the prostate.

Aged↗
PubMed1987

Stricture prophylaxis in transurethral prostatectomy.

In a prospective study 317 patients with prostatic hypertrophy, admitted for transurethral prostatectomy (TUR P), were randomized into three different groups: (1) urethral dilation and TUR P; (2) urethrotomy according to Otis and TUR P, and (3) TUR P alone. The number of postoperative urethral strictures significantly decreased in the Otis group and significantly increased in the dilatation group as compared with the control group.

Aged↗
PubMed1987

Effective perioperative prophylaxis with a single dose of cefotaxime in transurethral prostatectomy.

In a prospective, observer-blind study, the authors assessed the efficacy of cefotaxime (2 gm IV) as auxiliary therapy to the currently used antimicrobial prophylaxis in transurethral prostatectomy. Cefotaxime was administered to 48 patients. From these, 188 blood specimens were drawn and eight blood cultures from eight patients were positive. From an untreated control group of 50 patients 196 specimens were drawn. Thirty-one of these specimens (from 17 patients) were positive (P less than 0.05). This significant reduction was due mainly to fewer pathogen isolates (1 versus 16). The number of postoperative complications was reduced from 21 in 15 patients to 12 in 10 patients (P less than 0.05). It is concluded that a single IV dose of 2 gm of cefotaxime protects against the immediate perioperative complications.

Aged↗
PubMed1986

Predictive values of diagnostic tests in the evaluation of female urinary stress incontinence.

Preoperatively a collaboration between gynecologists, urologists and radiologists is essential for the diagnostic accuracy of urinary incontinence especially to isolate stress incontinence for surgical treatment. The aim of this study was to estimate the value of these combined efforts. 212 women referred for urinary incontinence were assessed by history of micturition, pelvic examination, cystoscopy, cystometry, stress test for urine loss, uroflowmetry and colpo-cysto-urethrography. A final diagnosis obtained on this basis classified the patients in stress incontinence (130), urge incontinence (47), neuromuscular dysfunction (6), uncertain type (10), other disease (8) and no incontinence (11). According to calculations of predictive values of positive and negative tests, respectively, each single test in the preoperative investigation programme was evaluated regarding the final diagnosis stress incontinence. It was assumed that the symptom stress incontinence, the pelvic examination and the colpo-cysto-urethrography were of minor or no importance for the diagnosis stress incontinence but might have been for the choice of surgical treatment. Cystoscopy and uroflowmetry had no place in daily routine. In contrast normal cystometry and especially the sign stress incontinence deserved consideration of refinements.

Adult↗
PubMed1986

The value of colpo-cysto-urethrography in female stress- and urge incontinence and following operation.

The value of colpo-cysto-urethrography (CCU) in female stress- and urge incontinence was measured. In a prospective series of 172 consecutive females with stress- or urge incontinence, CCU was performed and assessed with regard to no suspension defects, anterior defects, or posterior defects, respectively. Six months following operative repair for stress incontinence, CCU was repeated in 97 patients and compared with operative success. CCU was of minor value in the differentiation between stress- and urge incontinence. In stress incontinence, CCU was of greater value for the preoperative planning of operative technique, vaginal or abdominal, but could be omitted when pelvic examination did not disclose genital prolapse, as this excluded posterior suspension defects at CCU. Postoperative CCU was of minor value, and poorly correlated to operative success or failure. Stress incontinence with anterior suspension defects was best treated by abdominal colposuspension, even when complicated by genital prolapse. With no suspension defect at CCU, vaginal and abdominal repair were equally good alternatives. Posterior suspension defects had the lowest cure rate.

Female↗
PubMed1986

Optical internal urethrotomy with and without catheter. A comparative study.

The role of postoperative catheter treatment after optical internal urethrotomy was studied in a prospective, consecutive, randomised series of 54 patients. Group one was treated without catheter and group two with catheter for one day. No significant difference in recurrence rate was found between the two groups studied by means of voiding interview, uroflowmetry and retrograde urethrography.

Adult↗
PubMed1984

An unusual complication to transurethral resection of the prostate. A case report.

During a transurethral resection of the prostate, performed in epidural anaesthesia, a 77-year-old man developed dyspnoea and distension of the lower abdomen. Acute cystostomy revealed a large bladder diverticulum containing 2 liters of irrigating fluid together with some tissue chips and 3 small bladder tumours. The tissue chips functioned as a stop valve only permitting entrance of fluid. In the absence of preoperative radiological examination of the urinary bladder meticulous cystoscopic examination of every tiny opening in the bladder is mandatory.

Aged↗
PubMed1983

Sucrose-induced insulin resistance in the rat: modulation by exercise and diet.

Isocaloric substitution of sucrose for starch results in hyperinsulinemia and deterioration of glucose tolerance, suggesting a loss of insulin sensitivity. In this study we have quantitated the insulin resistance which develops with sucrose feeding, and evaluated the ability of dietary fiber, or an increase in skeletal muscle activity, to inhibit, or even prevent, the detrimental effect of sucrose feeding on in vivo insulin action. Thus, 6-wk-old rats were fed one of the following regimens for three weeks: a 64% cornstarch diet (C), a 32% cornstarch + 32% sucrose diet (S), the (S) diet containing added wheat bran fiber (S/F), and the (S) diet given to rats running spontaneously in exercise wheel cages (S/ET). Insulin sensitivity was evaluated by comparing steady-state plasma glucose (SSPG) concentrations at constant plasma insulin levels approximately 70 microU/ml attained during the continuous infusion of epinephrine (0.08 micrograms/kg/min), propranolol (1.7 micrograms/kg/min), glucose (8 mg/kg/min), and insulin (2.5 mU/kg/min) to each experimental group. The results show that rats fed the S diet had a significant increase (p less than 0.01) in mean (+/- SEM) SSPG concentration compared with rats fed the C diet (255 +/- 14 versus 165 +/- 3 mg/dl). SSPG concentrations, although lower (p less than 0.05) in rats fed S/F (205 +/- 8 mg/dl), were still higher (p less than 0.05) than the C levels (165 +/- 3 mg/dl). However, S/ET completely inhibited the increase in SSPG concentration seen in rats fed S and the values were actually lower (p less than 0.05) than in rats fed C (100 +/- 10 versus 165 +/- 3 mg/dl). In conclusion 1) sucrose feeding results in a loss of insulin sensitivity in normal rats; 2) addition of fiber attenuates, but does not completely prevent, the loss of insulin sensitivity associated with feeding sucrose; 3) exercise training prevents the loss of insulin sensitivity seen in sucrose-fed rats, and actually improves glucose uptake beyond that seen in the control group. These results document the profound effect of environmental factors on in vivo insulin action.

Animals↗