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Biomedical subjects

B Helpap

Publications and source records attributed to B Helpap.

At least 91 records · Page 5Linked to original sources
PubMed1983

The morphological consequences of thermosurgery.

Immediately after electric coagulation or laser surgery, black-brown carbonizations were observed on the surface of different human tissue biopsies and in the experimental studies of rat organs. In specimens of liver, urinary bladder, and prostate coagulation necrosis developed, followed by a cell-rich granulation tissue with giant cells of the foreign body type. More than 3 months after the thermoinjury the granulomas could still be demonstrated in the tissue. After 6-8 weeks postoperatively (p.o.) a fibrous scar tissue began to develop. The number of lymphocytes in the central T-dependent peripheral lymphatic sheaths (PALS) of the spleen and their labeling index decreased within the first 2 days after thermoinjury followed by a slight hyperplasia after day 5. This initial T-cell alteration may reflect the clinico-serologic finding which shows that after skin burn a temporary reduction of the cell-mediated immune defense mechanism of the organism is observed. Compared with wound healing after scalpel or cryosurgical injuries, the delayed wound healing after thermosurgery may be caused by the alteration of the lymphoid system due to a disturbed co-operation of T- and B-lymphocytes with macrophages.

Animals↗
PubMed1983

[Is tubal sterilization with the Tupla-clip a reversible method?].

Between 1976 and 1981 402 tubal sterilizations were performed with Tupla-clip most of them by laparoscopic application. 11 tubes were removed between 15 and 47 months following the sterilization with the Tupla-clip. The local changes both macroscopically and microscopically to the tupla-clip were evaluated. The possibility of tubal patency following removal of the clips was tested by carbon dioxide pertubation. The tubal-occlusion with the tupla-clip is definitive since all tubes had a fibrous tissue strand where the clip had been applied which still carried blood vessels. No tube was patent with the carbon dioxide pertubation. The intra-operative testing of correct application of the clip and the documentation of this correct application is again mentioned. This is especially important in view of the recent judgements of the federal supreme court regarding liability in failed tubal sterilizations. The excellent chance of reversal by tubal anastomosis and the 100% success rate of this method of sterilization within the 6 years under observation will increase the acceptance of the tupla-clip as a method for tubal sterilizations.

Female↗
PubMed1983

[Comparative histologic studies following esophageal varices sclerosing with different substances].

Sclerosing varices of the lower esophagus by endoscopic injection of phenol-peanut oil or ethoxysclerol into the submucosal tissue induces inflammatory changes of varying degree. The process of inflammation leads to formation of connective tissue surrounding and protecting the varices, or to obliteration of these vessels. Phenol-peanut-oil induces a rather mild inflammatory process which contains many macrophages and runs a slow course, leading to fibrosis and sclerosis without complications worth mentioning. Ethoxysclerol on the other hand can induce suppurating, almost phlegmonous inflammation; complications like mediastinitis and pleural exsudates are definitively more common than after injection of phenol-peanut oil. Life threatening situations and death may occur after previous treatment by balloon compression and subsequent sclerosing procedures. Therefore, treatment of esophageal varices by sclerosing procedures should only be done, if the esophageal wall has not been altered by mechanical therapeutic measures.

Esophageal and Gastric Varices↗
PubMed1983

Should treatment of highly differentiated thyroid carcinoma be conservative?

On the basis of three selected cases (one with clinically occult follicular and two with metastatic papillary carcinoma) the necessity of a comprehensive therapeutic concept even in highly differentiated thyroid cancer is stressed. Thyroid tissue and regional metastases should be eliminated by surgery, followed by radioiodine therapy in any event. Radiation teletherapy should be reserved to patients with invasive tumor growth exceeding the organ capsule, with lymph node metastases, and with massive angioinvasive growth.

Adenocarcinoma↗
PubMed1982

[Grading and staging of urinary bladder carcinomas (author's transl)].

In a retrospective study, staging and grading of 2085 primary and recurrent urinary bladder carcinomas were determined according to WHO and UICC rules. Of the carcinomas 51% were papillary, 23% solid and 26% partly papillary and partly solid. 46.2% of carcinomas were correspondent to malignancy grade I, 37.7% to grade II and 16.1% to grade III. The depth of invasion was the greater the less the degree of differentiation. The uncorrected recurrence rate of carcinoma was 14.9%, 28% of the recurrences showed an increase in malignancy grade and (or) depth of invasion. The recurrence rate fell within the first three years from 76.8% to 8.2%. In addition, there was a high degree of coincidence between carcinoma grade III and severe urothelial dysplasia. The diagnosis of severe dysplasia is an indication for frequent cystoscopic and bioptic checks. Since the biological significance of urinary bladder carcinoma depends not only on the degree of malignancy but also on the depth of invasion and the readiness of carcinoma towards invasion, it is necessary for successful prospective studies, designed to evaluate the course of urinary bladder carcinoma and their therapeutic response, to incorporate exact staging and grading.

Adult↗
PubMed1982

Electron-microscopic study of the development of the periarteriolar zone in splenic white pulp of rats.

To obtain more information concerning the origin of interdigitating cells, the postnatal development and morphology of the periarteriolar lymphatic sheath in splenic white pulp of rats was investigated by light- and electron-microscopy. Special attention was paid to the ontogeny of interdigitating cells. The spleens of the animals were studied in the age range from 1 h to 28 days after birth. The splenic white pulp of neonatal rats consists only of a few reticuloblasts, which are concentrically arranged around central arterioles. After 21 h an increase in promonocytes and monocytes was noted. Between the fifth and seventh postnatal day monocytogenic cells with a light and almost translucent cytoplasm appear, which display long cytoplasmic projections between the adjacent cells. Neighbouring lymphocytes often insert finger-like processes into the invaginated cellular membrane of these transitional forms. This intimate cellular contact is supported by zonulae occludentes. These cells represent transitional forms between monocytes and interdigitating cells. From seven days of age onwards typical interdigitating cells were present as in adult animals. After the differentiation into an inner and outer periarteriolar lymphatic sheath, the T-cell-dependent area of splenic white pulp has attained its adult appearance and further changes are not to be expected. On the basis of these findings, it is highly probable that interdigitating cells develop via transformation of monocytes.

Animals↗
PubMed1982

Regeneration of endocrine cells in the stomach.

A mucosal defect was produced by cryosurgery in the antral and the fundic wall of the rat stomach, and regeneration of gastric endocrine cells was studied 50, 100 and 200 days after operation. Fifty days after the operation, the mucosal defect was completely covered with regenerated epithelium. The regenerated mucosa both in the antral and in the fundic region consisted of mucinous glandular structures. The regenerated mucosa in the corpus remained pseudopyloric in type even 200 days after operation. Regardless of the time after operation, regeneration of endocrine cells was always observed. We could identify G cells and EC cells in the regenerated mucosa of the antrum, and EC cells, A cells and AL cells in the regenerated mucosa of the corpus, respectively. By electron microscopy, endocrine-exocrine cells were frequently encountered. These cells had two different types of intra-cytoplasmic granules; one was an endocrine-specific, small electron-dense granule, and the other a large, lucent mucin droplet-like granule. These findings indicate that the endocrine cells of the stomach are formed from endodermal precursor cells.

Animals↗
PubMed1982

[Morphological and cell kinetic investigations of wound healing of rat kidney after local freezing ].

The effects of cryonecrosis in rat kidney after single and repeated local freezing were studied by morphological and cell kinetic methods. Shortly after single and repeated cryolesions a well-demarcated coagulation necrosis developed which was replaced by granulation tissue. 4 weeks after the second freezing only a small fibrous scar was visible. Cell analysis revealed no significant differences between single and repeated cryolesions. Autoradiographically, however, it was shown that the labelling index of fibroblasts in the granulation tissue was higher after repeated than after single cryolesions. The proliferation maxima of epithelial cells were delayed for 24 h. After 4 weeks the cell proliferation again had reached normal values. Hardly any differences between wound healing after single and after repeated cryolesion were found. Thus, repeated is advisable and no complications should be expected.

Animals↗
PubMed1982

[Results of chemoimmune prophylaxis of superficial bladder carcinoma (author's transl)].

41 patients with superficial urothelial bladder cancer were subjected to chemoimmune prophylaxis with i.v. cyclophosphamide and intravesical as well as systemic BCG treatment, after complete tumor resection. Compared with a historical patient control group treated by tumor resection alone, the chemoimmune treatment group exhibited a distinct reduction of the recurrence rate. This difference was most marked during the first 6 months postoperatively. The side effects of this treatment were tolerable. Our results are discussed with regard to the reported findings in the literature. Possible immune biological mechanisms of the tumor protection achieved by cyclophosphamide/BCG are suggested.

Adult↗
PubMed1981

[Combined nevus: malignant blue nevus and giant pigmented nevus (author's transl)].

A combined nevus occurring on the right temporal region of a 30-year-old man with multiple giant pigmented nevi on the head, trunk and extremities was surgically removed. Histologically, the cellular blue nevus found in the deep corium fulfilled the criteria of malignancy in so far as mitoses and foci of tumor necroses were present.

Adult↗