Biomedical subjects
Publications and source records attributed to F Lintner.
Myometrial homogenates of estrogen-treated nonpregnant rats were fractionated by differential and discontinuous sucrose gradient centrifugation. Binding of PGF2 alpha was maximal in membrane fraction which showed the highest specific activity of 5'-nucleotidase, a marker for plasma membrane.
Progesterone production was compared in short-term cultures of turkey and fowl granulosa cells isolated from preovulatory follicles of different maturities. In both species cells from the most mature follicle produced the greatest amount of progesterone under stimulated conditions and in response to ovine or turkey LH, the latter being significantly more potent. Whereas basal production of progesterone was higher in turkey cells, the response to LH or cAMP stimulation was significantly greater in chicken granulosa cells both in absolute terms and particularly in relation to unstimulated levels. These species differences may reflect difference in the intensity of reproductive activity of the turkey and the domestic fowl selected for egg production.
On the basis of the newly-formed capsular tissue of 80 cemented (Weber-Huggler, Müller-Charnley) and uncemented (ceramic/ceramic/titanium) total hip endoprostheses which had to be reoperated on because of aseptic loosening, the efficiency of the Sudan-III-staining reported in literature to identify polymethylmethacrylate (PMMA) bone cement particles is investigated, because the quantity as well as quality of the various wear products is discussed as possible factors of prostheses loosening. PMMA-, polyethylene and polyester particles show definite sudanophilia and orange-red coloration in the Sudan-III-stained frozen sections, so that only very large wear products utilizing the knowledge of the materials of the artificial joints used can be recognized by their forms, whereas the wear stored in the macrophages cannot be identified. Thus, Sudan-III-staining is not suitable for guaranteeing identification and determination of the amount of PMMA-wear.
Explore the source record for details and available documents.
The prosthesis loosening represents the main complication of an endoprosthesis. When using bone cement for an anchorage, the most important factors of loosening are the impairment of tissue during toxical and thermic influence, foreign body reaction on the abraded material of the prosthesis, the resorption effect through foreign body giant cells as well as the parallel effect of monomer impoverishment and the dissapearance of polymerization matrix material. Histological examinations of the reparation proceedings of not loosened cement-bone surfaces at total endoprostheses are rarely found in literature, and the extent of a long term effect of the cement on the bone layer has not been sufficiently ascertained. To obtain an insight into the reaction of the bone tissue to the bone cement, the bone-cement surface was examined histologically after 3-10 years TEP-implantation.
Explore the source record for details and available documents.
The question of an accelerating influence of the fibrin adhesive (Immuno AG, Vienna) on healing has been investigated in the suture of heel tendons of 69 rabbits. The achilles-tendon cut through was anastomosed in typical way, but besides in the one group a homologous fibrinogen-cryoprecipitate was applied. The histological and biomechanical evaluations of the anastomosis were carried out after one, two and four weeks. By means of the fibrin adhesive the loading capacity of the healing tendons could not be accelerated. The data of rupture stress were in the control group after one week 1.65 kg (+/- 1.14) and after two weeks 8.66 kg (+/- 1.38) and in the fibrin group 2.13 kg (+/-1.28) respectively 7.76 kg (+/-2.19). The difference between the two groups is not significant. Four weeks postoperatively the test could not be carried out, for the anchorage of the tendons at the material testing machine was not possible for over 15 kg stress-strain. Histologically a distinct difference of the repair process of the tendons operated on could not be seen in the two groups either.
Heterologous bone grafts are mostly refused for bone transplantation because of the low osteogenic potency. The remodelling of the heterografts can be improved significantly by application of a fibrin-adhesive-system. Between 1977 and 1979 thirty-five bone defects caused by bone tumors resp. seven times by osteomyelitis were operated on and closed with cancellous Kiel-bone grafts (Braun, Melsungen) soaked thoroughly with fibrin-glue (Tissel/Tissucol TM, Immuno AG, Vienna). Postoperatively there were two infections, but none of them in our osteomyelitic cases. After an average follow-up period of 24.6 months (15-36), the highly satisfying, preliminary results were exactly analysed. Despite the relatively short postoperative time, in almost all cases the complete remodelling of the heterografts into new bone tissue could be observed. A formula to calculate the amount of fibrin-glue, necessary for the procedure, is given.
A malign giant cell tumor of the soft parts is reported and the specific localization of the hand is pointed out; on this basis, a possible connection or a common origin is discussed and the latest literature reviewed.
Typical symptoms of acute myocardial infarction led to admission of a 66-year-old female. Creatine kinase (CK) was 720 U/l on admission and together with CK-MB of 108 U/l fitted the clinical picture. The ECG showed complete left bundle branch block. The patient died a few hours later in cardiac failure. Massive hypercalcaemia of 6.2 mmol/l and hyperphosphataemia of 1.6 mmol/l suggested acute primary hyperparathyroidism already clinically which later could be verified by a parathormone level of more than 100 000 ng/l ("C-terminal assay"). At necropsy chief cell adenoma of the epithelial bodies was found, typical changes of primary hyperparathyroidism in the skeleton and kidneys, and disseminated calcifications and fresh necroses of cardiac muscle. The coronaries were normal. This is the first clinical report of fatal acute primary hyperparathyroidism due to hypercalcaemia-induced myocardial necroses.
The influence by a fibrin-adhesive on healing has been investigated in heterologous cancellous transplants in the rabbit ilum. After 8 and 12 weeks the radiologic and histologic results were evaluated. In the control group the fibrously surrounded transplants were resorbed and replaced by metaplastic bone only to a little degree. Applicating the fibrin-adhesive system (FKS) the transplants were osseously connected to the bone bearing. The trabeculae wre surrounded by newly built lamellar bone and resorbed during the following periods. The osteogenic potency of heterologous transplants resp. the efficiency of the bone bearing can be improved by application of the FKS.
WHO mortality statistics are subject to severe criticism all over the world due to the ICD code, the monocausal evaluation and th inhomogenity of data which are only partially verified by post mortem findings. Despite this fact WHO statistics are the only possibility to compare morality in different areas. In order to prove their reliability we have collected data of patients who have died in 9 Vienna hospitals. Our material consists of more than 15000 out of 25000 death cases in the year 1976. The autopsy rate was about 70%. To handle this amount of datas a computer system was used. In comparison with the official Austrian statistics our total atherosclerosis rate was higher due to the multicausal evaluation and the much higher percentage of CHD. Atherosclerosis of the brain was found in a lower percentage than officially mentioned when autopsy was performed. An example for single case studies is the myocardial infarction in a defined age group to support the importance of statistics based on a high rate of autopsies and the use of electronic data processing.
The changes in remodelling of autologous cancellous bone after reimplantation using a fibrinogen adhesive system (FAS) consisting of highly concentrated fibrinogen, thrombin and factor XIII were investigated in 23 rabbits. A 5 x 6 mm sized piece of bone was removed from the iliac crest and reimplanted in the same place with and without FAS. Histological, tetracycline fluorescence and radiological evaluation were carried out after 3, 6 and 9 weeks. The control group (without FAS) showed considerable breakdown of the bony trabeculae due to regression of the osteocytes in the centre of the reimplanted bone after 3 weeks, whereas in the FAS group bone was being built on to the vital trabeculae. After 6 weeks the reimplant in the FAS group was still clearly advanced in relation to the non-FAS group. The difference had almost disappeared after 9 weeks. Acceleration of remodelling and lack of regression of the osteocytes in the centre of autologous reimplants after the use of FAS indicates an earlier recommencement of nutrition as compared with the control group. New bone formation in autologous reimplants was clearly accelerated by the use of FAS.
Malignant degeneration of primary leiomyoma of the dorsal wall of the upper segment of the inferio vena cava (leiomyosarcoma) is reported in connection with the Chiari-Budd Syndrome. The facilities for improved ultrasonic diagnosis are pointed out and, hence, the possibility of earlier initiation of therapy.
Explore the source record for details and available documents.
Twelve uncemented, artificial patellar components clinically and radiologically without signs of loosening after an implantation period of 9-48 Months were investigated histologically and microradiographically. The components correspond to the system GSB-"old", GSB-"new", PCA and APS. Within the observed implantation period the artificial patellar components GSB-"old", GSB-"new" and PCA showed severe patho-morphological changes of the surrounding tissue and point to loosening. The dowel system according to APS shows after the longest period of time of 14 Months morphologically a fully bony encasement with wide spread direct contacts between the living bone and the metallic Titanium surface. The observation points urgently to the fact, that Polyethylene must not be in direct contact with the bony bed. On the basis of the patho-morphological reactions a partial armament of the polyethylene surface with metallic structures must be rejected as a general principle.
We examined the rates of necrosis of newly formed capsula tissue (the number of newly formed capsular tissues with necrosis) after the reoperation of 95 cemented and 11 uncemented total and cup endoprostheses, consisting of different arteficial joint materials. A comparison was made to the joint capsular tissue of 492 patients with arthrosis. The necrosis rate shows a lack of statistical significance within the two year-groups over a period of 12 years and between the different types of prostheses by using PMMA-bone cement. Therefore, it is assumed that a biological equivalence of the prostheses wear products is reached. It is also argued that necrosis can possibly develop from the sudden increased accumulation of PMMA-bone cement particles from the bone bed, caused by the loosening of the prosthesis. In comparison the newly formed capsular tissue of the uncemented prostheses, of which no necrosis was shown, evidence is given that the development of necrosis is chiefly due the quantity of PMMA wear products present. Because of the difficulty to exactly identify the PMMA-bone cement wear products, the toxicity of the PMMA-bone cement--who ist good known and in agreement in recent literature--or its wear products continues to be of hypothetical value in the production of necrosis. This is inspite of the successful detection by the gaschromatograph of the highly toxic paratoliudine in PMMA-bone cement. On the basis of the high statistical significance of the rate of necrosis in comparing the arthrosis joint capsules (14.83%) to the newly formed capsules (73 : 100%) it is shown that the capsulare fibrosis and scar formation to the obliteration of the lymphatic vessels is of secondary importance.
Explore the source record for details and available documents.