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Biomedical subjects

K Behrens

Publications and source records attributed to K Behrens.

18 recordsLinked to original sources
PubMed1997

[Laparoscopic palliative gastrointestinal operation in inoperable upper abdominal tumors with gastric outlet obstruction].

In the period from June 1994 to February 1997, a laparoscopic gastroenterostomy was carried out without intraoperative complications or mortality. In 12 out of 13 patients with gastric outlet obstruction due to inoperable tumor of the upper GI tract (gastric, gallbladder or pancreas carcinoma). From the above, a total of 4 patients had postoperative complications (30.7%), three of which could be treated without further operation. The average duration of the operation was 130 min (range 70-285 mins) followed by an approximal postoperative hospital stay of 17 days (8-41 days).

Gastric Outlet Obstruction↗
PubMed1996

Geometric mismatch of the Gamma nail to the Chinese femur.

The geometric mismatch of the femoral component of the Gamma nail to the Chinese femora resulted in intraoperative complications. To provide scientific data for modification of the implant, 28 pairs of normal Chinese femora were studied with the 3-dimensional reconstruction from the computed tomography scan data. Measurements were taken from the reconstituted drawings, and the anthropometric data were applied in the modification of the implant. This study is the first report on the application of Chinese anthropometric data on the design of a trauma implant. It is hoped that a larger scale of the study will provide a more comprehensive data base for wider application to orthopaedic implant design in the future.

Aged↗
PubMed1995

Effect of allergen provocation on inflammatory cell profile and endothelin-like immunoreactivity in guinea-pig airways.

The effect of allergen challenge on the number of leucocytes and the concentration of endothelin 1-like immunoreactivity (ET-LI) in bronchoalveolar lavage fluid (BALF) was investigated in guinea-pigs sensitized to Ascaris suum. The animals were twice exposed to allergen aerosol. All animals responded to the second challenge with bronchoconstriction. Twelve hours later, a significant increase in the number of eosinophilic granulocytes in BALF, compared to unsensitized and unprovoked control animals, was noted. Twenty-four hours after provocation, there was also an elevation of ET-LI concentration and content of neutrophils. During the first day post-challenge, the ET-LI values were moderately correlated to the eosinophil levels. One week after challenge, the ET-LI level and the neutrophil count did not differ from corresponding values in control animals whereas the number of eosinophils remained elevated. Pretreatment with dexamethasone before the second allergen challenge did not consistently affect the parameters studied during the first 24 h. Bronchoconstriction induced by carbachol aerosol affected significantly neither the ET-LI concentration nor the number of inflammatory cells in BALF. It is concluded that the allergen-induced inflammation in the guinea-pig airways causes an elevation in the ET-LI concentration in BALF and that this is moderately correlated to the influx of eosinophils during the first 24 h.

Allergens↗
PubMed1992

Evolution of the retrotransposons TRS/ingi and of the tubulin genes in trypanosomes.

The African trypanosomes have genomes of high plasticity, as demonstrated for instance by their ability to shuffle their genes around, coding for variant-specific surface glycoproteins (VSGs). Another indication of their genome plasticity is the presence of multiple retro-elements. The retrotransposon-like element TRS/ingi is present in many copies in the genome of trypanosomes. One particular derivative of TRS/ingi, called TUBIS, had previously been found to interrupt a tubulin gene in a particular strain of T. brucei. Here both TRS/ingi and TUBIS were studied by hybridizing genomic DNA of various strains and species of trypanosomes with suitable probes in order to elucidate the evolution of this family of retro-elements. The TSR/ingi elements are highly repeated and have very long open reading frames, while TUBIS clearly is a truncated, inactivated form of this element, found in only one particular chromosomal location. Both elements were shown to be present in several strains and species of the subgenus Trypanozoon, in particular in T. brucei brucei, T. gambiense, T. rhodesiense, T. equiperdum and T. evansi. They could not be detected in species of other subgenera, in particular in T. congolense and T. cruzi. These findings suggest that the retrotransposon TRS/ingi was acquired by trypanosomes only after divergence of present day subgenera. The TUBIS element was found in exactly the same chromosomal location (at the 3' end of the tubulin gene cluster) in many different strains and species of the subgenus Trypanozoon. This shows that the element was transposed to this location before speciation of the subgenus. Although, TRS/ingi is unlikely to be involved directly in VSG switching, it may have contributed to the genome plasticity of trypanosomes.

Animals↗
PubMed1989

Leydig cell mitoses in human testes bearing early germ cell tumors.

Numerous mitoses were noted in testicular tissue from adult men with early germ cell tumors. More than 15 Leydig cells undergoing mitosis were found in the interstitial compartment. The presence of specific crystalline intracytoplasmatic inclusions demonstrated for the first time that differentiated Leydig cells are capable of proliferation. Occasionally cells are difficult to discriminate during mitosis. To establish reference criteria, the light- and electron-microscopic features of the following mitotic cells were examined: Leydig cells, fibroblasts, perivascular cells, peritubular cells, and lymphocytes. Supplementary mitoses in germ cell tumors and in a case of Leydig cell tumor were investigated. In the literature, only single reports of mitoses in Leydig cells are available. The frequent incidence of Leydig cell mitosis in early germ cell tumors may be due to the presence of growth-promoting factors in the testicular tissue.

Adult↗
PubMed1989

[Puerperal thyroid gland dysfunction in healthy patients].

Elevated thyroid antibodies (AB) have been described in clinically healthy women indicating a postpartum thyroid dysfunction. We evaluated the incidence of the postpartum thyroid dysfunction in Hannover, FRG. 121 women were examined 1-5 days pp and 2-4 months later; 76 were restudied 5-7 months pp. Every time T3, T4, TSH, TBG, microsomal AB and thyroglobulin AB were determined. Six patients showed increased TAB and 10 increased MAB titers. Severe clinical symptoms were not complained. In some patients these elevated titers turned to normal subsequently. Further studies must evaluate the prognosis of this disease.

Adolescent↗
PubMed1987

[Comparison of Blount's sling and Kirschner wire fixation in the treatment of a dislocated supracondylar humeral fracture in childhood].

From 1979 to 1982 we were treating 63 cases of displaced supracondylar fractures of the humerus. Patients underwent either closed reduction and fixation by collar and cuff immobilization (32 cases), or fixation by means of Kirschner wires following closed or (more often) open reduction (31 cases). Follow-up controls after an average time of three years clearly showed the more favourable results of the conservative method.

Adolescent↗
PubMed1987

[Clinical and histopathologic studies of primary glandular cancer of the uterine cervix. An analysis of 78 cases from 1972 to 1984].

In the period between 1972 and 1984 716 cervical carcinomas, of which 78 were glandular cancers, were diagnosed at the University Hospital in Hamburg-Eppendorf. The incidence of invasive adenocarcinomas of the cervix is 10.9%. When compared with a study published in 1949 (19) the incidence of adenocarcinoma has risen from 3% to 10.9%. In the period of observation, i.e., from 1972 to 1984, no trend to an increase in incidence was observed. The average age of the patients, 62.6 years, is relatively high in comparison with other studies. An earlier onset of disease has not been observed. The available data do not provide any evidence of connection between the use of oral contraceptives and later development of an adenocarcinoma. The five-year survival rate for all stages taken together was 40.4%. The five-year survival rate, and thus the prognosis for glandular carcinomas of the cervical glands, depends primarily on the clinical stage of the disease, though also on the histological type and the degree of differentiation of the tumor.

Adenocarcinoma↗
PubMed1984

[Diagnosis and therapy of syphilitic changes of the skin and mucous membrane in the head and neck].

Since the mid seventies the German Federal Board of Statistics has recorded a decrease in the incidence of the classical venereal diseases gonorrhoea and syphilis. This decrease is based only on a decline in the morbidity of gonorrhoea. Statistics on syphilis show an increase, from about 6000 to 8900 new cases each year, that is an increase of 48% between 1974 and 1978. Some cities such as Cologne, with a total of 401 new cases each year, show an increase, while numbers in rural regions remain unchanged or show a slight decline. Between 1978 and 1980 at the ENT and Dermatologic OPC of Cologne University many ulcers of uncertain aetiology in the head and neck region have been diagnosed as primary or secondary syphilis or as unusual presentations of this disease. In our Department a primary lesion of the head and neck was the presenting symptom in about 6% of all newly diagnosed cases. The differential diagnosis of early syphilitis lesions in the head and neck, the present position of serological diagnosis, and the current treatment of syphilis are illustrated by selected typical lesions.

Adult↗
PubMed1982

[Peripheral T-lymphocytes and delayed hypersensitivity in surgically and radiologically treated patients with early stages of larynx-carcinoma].

122 patients with squamous-cell-carcinoma of the larynx (T1-stage) were examined after surgical or radiological treatment. None of these patients showed evidence of tumor recurrence. Peripheral T-lymphocytes and delayed hypersensitivity were studied in all these patients. According to their treatment, the patients were allotted into three groups and compared with a control group, consisting of 20 patients with nonneoplastic head- and neck-disease. The main finding was a significant decrease in the peripheral T-lymphocytes in surgically- or radiologically-treated patients with a squamous-cell-carcinoma of the larynx (T1-stage). This reduction of T-cells must be interpreted as a congenital or acquired defect of the immunocompetent system. In about half of the control cases the DNCB-tests showed no evidence of delayed hypersensitivity. In view of these results and those reported in the literature, the test should be used critically. In contrast to our earlier findings, where patients received radiotherapy over large areas including big vessels, radiation over a smaller, localised area does not lead to a significant depression of peripheral T-lymphocytes.

Adult↗
PubMed1981

[A new technique of triple osteotomy for turning dysplastic acetabula in adolescents and adults (author's transl)].

A new form of triple-osteotomy of the pelvis is described. The ischium is osteotomized from a dorsal approach, immediately behind the hip joint. The ischium is left in place, the ligaments giving stability to the sacrum remain in tension. After turning the patient a small medial incision is done for the osteotomy of the pubis. The The ilium is cut through with a Gigli saw from a small incision laterally. It should descend medially in a distance of 2-2,5 cm apart from the joint. The possibilities to turn the acetabulum are very good and correspond to the amount of abduction before operation. Injuries to the sciatic nerve are avoided by the dorsal approach. The evaluations of 32 patients with different degrees of dislocations are reported. The osteotomy may be done even in flat-shaped femoral heads, where the acetabulum is still congruent as long as it is possible to abduct the leg and turn the femoral head into the acetabulum. It has been done in high dislocations with secondary acetabulae as well. The operation may be used in children above 8 years, where the osteotomy of Salter and acetabuloplasties are not efficient any more. In contrary to Chiari's osteotomy the acetabulum is covered by cartilage and the angle of inclination usually normal. It can be used in adults and beginning arthrosis as long as the abduction is not limited.

Acetabulum↗
PubMed1981

A modified technique of the triple pelvic osteotomy: early results.

A modification of the triple pelvic osteotomy for children over 8 years and the young adult is described. The results of the first 32 cases are reviewed. These show that the indications for the operation can be widened so that not only primary dysplasias but also subluxated or dislocated hips with secondary dysplasia can be operated on successfully. The operation is done in two stages. At first the patient is lying prone. The osteotomy of the ischial ramus is done dorsally by cutting the connection between the sciatic notch and obturator foramen immediately behind and below the acetabulum. In the second stage, with the patient lying supine, the pubic and the iliac osteotomy are performed rather circular and parallel to the hip joint. These modifications have several advantages: (a) the operator has a direct field of view at all times; (b) the osteotomy is performed close to the acetabulum, thus allowing a great amount of lateral rotation and medial displacement of the acetabulum, thereby providing good coverage of the femoral head by hyaline cartilage; and (c) the ischial ramus and its ligaments to the sacrum are left intact, leading to greater stability of the pelvis and spine.

Acetabulum↗
PubMedDate not supplied

[The management of congenital hip luxation with arthrographic control, an individual risk-reducing and time-saving method. I. Choice of method and risk assessment based on arthrographic findings].

In 388 congenital hip dislocations arthrography was used to indicate the safest form of treatment. Immediate reduction in the squatting (human) position of plaster cast (Fettweis, Salter) was followed by 3.4% of avascular necrosis of the femoral head, while plaster casts after preliminary traction showed 14.8% necrosis and unsuccessful closed reductions preceeding open reductions 11.8%. Further investigations demonstrated the influence of mechanical factors. A higher percentage of avascular necrosis was found in a narrow capsular entrance between a deformed upper limbus (or acetabular bulge) and a protruding transverse ligament with insufficient reduction (lateral displacement greater than 5 mm) and abduction of more than 45 degrees. The percentage of avascular necrosis was also depending on the development of the epiphyseal nucleus, it was 0.9% in normal forms of nuclei, 4.5% when the nucleus had not appeared at the beginning of treatment, 4.7% in small and 12.5% in retarded nuclei. The rate of necrosis was increasing with age and the degree of dislocation. Critical arthrographic findings have been described. In sufficiently open joints and full reductions Pavliks harness or hip spicas in squatting (human) position are applied immediately. With moderate narrowing of the acetabular entrance and lateral displacement traction is used for 3-4 weeks with repeated arthrography. In severe soft tissue changes of the acetabulum and lateral displacement (greater than 5-7 mm) open reduction is safer than a forced closed reduction.

Adolescent↗
PubMedDate not supplied

[Postpartum thyroid gland dysfunction--a prospective study].

In a prospective study the postpartum thyroid function was investigated in 120 healthy women in the department of obstetrics and gynecology of the Medical School Hannover. A physical examination was performed in the first week after delivery and two to five and five to eleven months later. Additionally blood was drawn for the determination of thyroid hormones, thyroid autoantibodies and thyroid-stimulating hormone. In 10% of the patients pathological titers for thyroid microsomal autoantibodies and thyroglobulin autoantibodies were found, in 2.5% pathological concentrations of thyroid hormones. In none of these patients clinical symptoms of thyroid dysfunction could be found. After delivery a immunologically mediated thyroid disease should be considered in patients with clinical symptoms. Then the thyroid function needs to be investigated.

Adolescent↗