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Biomedical subjects

P Bloch

Publications and source records attributed to P Bloch.

At least 73 records · Page 4Linked to original sources
PubMed1980

[Magnetic closure for ileostomy (author's transl)].

The Maclet magnetic stoma seal already used by the authors for colostomies was applied to the closure of permanent terminal ileostomies. A reservoir is constructed upstreams of the closure with the last loop of ileum, so that the faeces accumulate and can be evacuated by intermittence. Patients empty the reservoir by removing the cap which blocks the intestinal lumen and introducing a probe into it. The technique was used on 2 patients who had undergone total proctocolectomy for familial polyposis of the colon. One patient has now been followed up for 3 years and the other for 6 months. The perfect continence obtained by this method favourably compares with Kock's continent ileostomy.

Humans↗
PubMed1980

Computer calculation of the dose distribution in the electron build-up region.

A procedure has been developed for producing accurate computer-calculated dose distributions at the air-tissue boundaries for oblique incidence of a photon beam. Measurements of the dose distribution under conditions of tangential incidence are presented for a Siemens 6 MV linear accelerator. These measurements have been compared with calculated distributions using the standard Cunningham-Clarkson calculation technique. Based on this comparison, two changes are suggested for improving the accuracy of the calculation. The grid spacing for the calculation is decreased in order that the rapid dose variations that occur at the boundary may be better followed. Furthermore, the dose calculation scheme is modified to take into account the differences in the amount of electron build-up which occurs. An algorithm is presented for making this modification. Also, the calculated dose at the exit surface had to be modified to handle the deficit of scatter material behind the calculation points. The results of these changes are shown as a comparison of a typical chest wall irradiation treatment plan using two opposing tangential fields.

Computers↗
PubMed1980

Nodular lymphoid hyperplasia of the small bowel associated with primary jejunal malignant lymphoma. Evidence favoring a cytogenetic relationship.

A nonimmunodeficient patient with diffuse nodular lymphoid hyperplasia of the small bowel and a jejunal malignant lymphoma of mixed lymphocytic-histiocytic type is reported. Surface marker and immunohistologic studies of the malignant lymphoma and of histologically benign lymphoid nodules proximal to the tumor showed a similar pattern of monoclonality (IgM-kappa) and gave suggestive evidence of a cytogenetic relation of the lymphoma to nodular lymphoid hyperplasia. It is suggested that intestinal nodular lymphoid hyperplasia may be a condition leading to lymphoid malignancy; its exact incidence in patients with both malignant lymphoma of the gut and a primary immunodeficiency syndrome should warrant further consideration.

Adolescent↗
PubMed1980

An experimental study of survival after two hours of normothermic hepatic ischemia.

Total hepatic inflow occlusion is well tolerated in pigs with normothermia for as long as two hours, provided that splanchnic venous pooling is avoided by active pumping through a splenojugular bypass. Hepatic dysfunction after 60, 90 and, even, 120 minutes of hepatic ischemia is mild and transient. Complete return to normal liver function tests is rapid. Early microscopic alterations of the liver are moderate, and no late abnormalities, such as cirrhosis or vascular changes, were observed one to three months later. Conversely, interruption of hepatic blood flow for three hours is not compatible with life. In this study, a previously unsuspected resistance of the pig liver to warm ischemia is demonstrated. These findings corroborate and extend those of recent clinical studies in which a similar tolerance of the human liver to prolonged normotherthermic ischemia is reported, thus questioning the necessity for deliberate hypothermia in operations involving the liver.

Alanine Transaminase↗
PubMed1980

[The role of the scout-film in urography (author's transl)].

The importance of the scout film (plain film of the abdomen) prior to any contrast examination of the urinary tract is pointed out. After initial review of radiographic techniques and normal anatomic findings, the pathologic findings due to urinary tract disease are pointed out and are differentiated from those of non urinary--tract origin.

Diagnosis, Differential↗
PubMed1979

[Intestinal polyposis (author's transl)].

Recto-colonic polyposis is typical of pre-malignant lesions. Recognition and the application of appropriate treatment offer true prophylaxis against recto-colonic carcinoma in sufferers. Careful study should be made of other family members, the only way in which latent forms may be discovered before the stage of malignant change.

Colonic Neoplasms↗