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Biomedical subjects

R Beer

Publications and source records attributed to R Beer.

At least 73 records · Page 4Linked to original sources
PubMed1986

[Animal experiment studies of combined suture and glue microanastomoses using a fibrin glue based on the Cohn I human plasma fraction].

A total of 48 end-to-side microvascular anastomoses between the A. and the V. femoralis of Albino Wistar rats were established with and without an additional gluing using the human plasma fraction Cohn I (Cohn-I adhesive) and clinically and histologically examined after 3-4 weeks--group 1 with 4 single button sutures and gluing, group 2 with 8 single button sutures and gluing as well as a control group with the usual suture technique with 12-14 single knob sutures (in each case 16 anastomoses). The time required for anastomosing could not be considerably reduced by the suture-gluing technique. In group 1 the thrombotic occlusion due to vascular wall dehiscences with penetration of the adhesive material into the lumen could not be prevented in eight anastomoses. Owing to the exact vascular wall adaptation with 8 single button (group 2) 14 anastomoses were free just as in the control group. Histologically the tissue-preserving influence of the gluing could be confirmed by the reduction of the number of sutures. Summarising it can be said that the perfectly performed suture technique should continue to play the dominating role, but that the combined suture-gluing technique can be a great help for the surgeon in special cases.

Animals↗
PubMed1985

[Adhesive strength studies of biologic tissue adhesives].

Different tissue adhesives including an own fibrin adhesive on the base of the human plasma fraction Cohn I were investigated in relation to their adhesive strength tension. These investigations were carried out on lyophilised skin grafts in vitro. The adhesive strengths were equal in case of the Cohn I adhesive, the Tissucol-Kit and also with Beriplast. These investigations will contribute to optimize an adhesive system.

Adhesiveness↗
PubMed1983

Multicentric giant lymph node hyperplasia clinically simulating angioimmunoblastic lymphadenopathy. Associated Kaposi's sarcoma in two of three cases.

We report on three patients whose clinical presentation and laboratory findings were similar to those of angioimmunoblastic lymphadenopathy (AILD). The pathology findings in the lymph nodes were characterized by enlarged lymph follicles, a massive plasma cell infiltration, and marked vascularization. These morphological features were similar to those of giant lymph node hyperplasia, plasma cell type. In two of the patients, there was an associated Kaposi's sarcoma.

Aged↗
PubMed1980

[Effect of a single gonadotropin injection on the uterus of prepuberal gilts].

Histological studies were conducted into the uteri and macroscopic studies into the ovaries of 64 gilts, aged between 180 and 220 days, following administration of 400 I.U. of pregnant mare serum gonadotrophin (PMSG) with 200 I.U. of human chorionic gonadotrophin (hCG) or 500 I.U. of PMSG with 250 I.U. of hCG, in order to test the action of one single injection of PMSG and hCG on the reproductive organs of prepuberal gilts. Ovulation was achieved in something between 75 and 100 per cent of all test animals which were treated in four experimental groups. The mean ovulation rates, following injection of 500 I.U. of PMSG with 250 I.U. of hCG, were between 17.2 and 28.6 (superovulation). The changes induced to the uterus by gonadotrophin injection were similar to those resulting from spontaneous onset of puberty, with the effectiveness of 500 I.U. of PMSG with 250 I.U. of hCG having been stronger than that of 400 I.U. of PMSG with 200 I.U. of hCG. However, histometric examinations have shown that uterus developed with induced cycle was not fully identical with uterus development with spontaneous onset of sexual maturity. Only in about 30 per cent of all animals tested was an induced cycle spontaneously followed by another cycle. Uterus growth was stimulated by gonadotrophin injection even in animals with no further cyclic activity.

Animals↗
PubMed1977

Paper chromatographic estimation of fructose and myo-inositol in human seminal fluid: a method for evaluating seminal vesicle and prostatic function.

A semiquantitative paper chromatographic method for the separation of myo-inositol and fructose in human seminal fluid was described. The intensity of the chromatographic zones characteristic of myo-inositol, which is a marker for human prostatic secretion and for fructose, which is useful in evaluating seminal vesicle function, were estimated after staining with an alkaline silver nitrate reagent. Characteristic patterns were found for patients with prostatic or vesicular dysfunction, and for patients with agenesis or blockage of the vas deferens. Paper chromatographic analysis of split ejaculate samples allowed evaluation of the sequence of ejaculation of the prostate and seminal vesicles.

Chromatography, Paper↗
PubMed1976

Epididymis and seminal vesicle as sources of carnitine in human seminal fluid: the clinical significance of the carnitine concentration in human seminal fluid.

Carnitine determinations in human seminal fluid were shown to be useful in assessing epididymal and seminal vesicle function and in locating blockages in the male reproductive tract. The carnitine concentrations in 50 samples of seminal fluid ranged from 15 to 530 mug/ml (as carnitine-HCl). The patients could be divided into four classes. Patients with normal seminal vesicle and epididymal function had values of 250 mug/ml or above. Those with a defective epididymis and a functional seminal vesicle had intermediate carnitine levels (100 to 200 mug/ml) and normal fructose values in the seminal fluid. Patients with a defective seminal vesicle but a functional epididymis had intermediate carnitine concentrations and low fructose levels. Extremely low carnitine values (less than 100 mug/ml) were found in seminal fluid from patients whose epididymis and seminal vesicle both were defective. The possible role of carnitine in sperm maturation was discussed.

Acid Phosphatase↗
PubMed1976

Retrograde ejaculation: pathophysiologic aspects and report of two successfully treated cases.

The ejaculatory process consists of two stages. During the first stage the semen is pumped into the posterior urethra and during the second stage the semen is propelled via the urethra through the external meatus. A pathologic second stage may lead to retrograde ejaculation of the semen into the urinary bladder. Attempts to achieve fertility in such patients can be made in two ways; namely through procedures to restore antegrade ejaculation (mainly using alpha-sympathomimetic agents) and procedures to regain viable and fertile sperm from the urinary bladder after sexual intercourse, with subsequent artificial insemination. The latter way of treatment was used in two patients who were referred for infertility and in whom retrograde ejaculation had been diagnosed. Postcoital urinary specimens were obtained by micturition and centrifuged. In one patient the sediment was washed with a nutrient solution; the other patient received alkalizing agents prior to intercourse in order to neutralize the urinary pH. The wives were inseminated on appropriate days and conceived. Both delivered healthy babies after uneventful pregnancies.

Adult↗
PubMed1976

Varicocle in oligospermic patients: pathophysiology and results after ligation and division of the internal spermatic vein.

We have followed for up to 32 months 51 oligospermic patients with varicoceles who underwent high ligation and division of the left spermatic vein. Of these patients 59.9 per cent had improvement in total sperm count, 47.1 per cent in sperm motility and 42.1 per cent in the morphological pattern of the spermatozoa. Pregnancies were reported by 13 patients. Improvement in sperm motility occurred first, followed by improvement in morphology. The last improvement was in total sperm count. We suggest that the observation period after a varicocele operation be restricted to 9 months, in which time about 75 per cent of the expected improvement takes place. A clinical classification for the degree of varicocele is proposed. No correlation between size of the varicocele and treatment results could be observed. A classification of sperm analysis is proposed, using a 3-digital index that might enable better comparison of sperm analysis and better communication among physicians. We could not define a specific group of oligospermic patients who might benefit more than other groups from a varicocele operation. Pathophysiological pathways leading to impaired spermatogenesis in patients with varicoceles are discussed.

Fertility↗