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Biomedical subjects

J Tichý

Publications and source records attributed to J Tichý.

At least 37 records · Page 2Linked to original sources
PubMed1988

The devitalization of the stomach by a devascularization technique.

Different parts of the stomach in healthy animals (pigs) were devitalized (devascularized) by eliminating the blood supply and left in situ. In model experiments, parts of the stomach were chosen for the devitalization with respect to most frequent location of carcinomas. The operation technique consisted of a complete ligature of perigastric vessels, bling enclosure of the cranial part of the duodenum with two ligatures with a possible application of a seromuscular suture and transverse cutting of the oral part of the stomach and its enclosing by a suture with a partial invagination of the wall. The passage was renewed by a gastroenteroanastomosis, some of the used modifications of the operation technique according to Billroth II (Schlater-Pólya). A method was mostly proposed with an interposition of the jejunal loop, which bridged the site of the devitalized part of the stomach. In 10 to 20 weeks the stomach tissue was stepwise degraded and it was replaced by fibrous tissue. The operation technique is simple; it could be applicable as a palliative or possibly therapeutic intervention in the case of inoperable tumours in human practice.

Animals↗
PubMed1988

A technique of the segmental devitalization of kidneys in experiment.

With the help of partially overlapping parenchymatous sutures, different renal segments were devitalized. After 8 weeks, a fibrous conversion occurred in devitalized part of the kidney. For the orientation during establishing the sutures, a topographic schematic diagram was used, which is simple and quite satisfactory for the use in practice. The study was performed on minipigs (21 x unilaterally, 3 x bilaterally) without any exitus of the experimental animals. A long series of experiments was performed in 37 rats on one kidney and in 40 rats bilaterally. Only in 3 rats the cause of the exitus was obviously in a connection with eliminating more than 70 to 75% of the renal parenchyma from the function. The devitalization technique presents good results in both series of the experiments. Possibilities of its use in the clinical practice in cases, where the resection therapy is being used currently, are discussed.

Animals↗
PubMed1987

Morphology of regressive changes in the kidney following experimental ischaemia.

Total or partial renal ischaemia was studied in rats and pigs in a series of experiments, after total devascularization (ligature of renal vessels and ureter); ligature of isolated renal artery; experimental embolization of renal artery by non-resorbable material; devascularization of a specific renal segment by deep, strangulating sutures. Morphological studies showed that the resulting necrotization is represented most frequently by coagulation necrosis, less frequently by colliquating necrosis. Occlusion of the renal artery by embolization or ligature leads only to partial necrotization or atrophy. Total devascularization of the renal hilus or total devascularization of a specific renal segment by strangulating sutures leads to total destruction of the devascularized (devitalized) tissues. Within 8-12 weeks, the whole organ changes into a small residue of connective tissue. The possibility of the use of the devascularization technique in the treatment of tumours is discussed.

Animals↗
PubMed1985

[Small and large intestine devascularization (devitalization) and potentials in the therapeutic use of this operative method].

The experimental findings with devitalization of various intestinal segments by means of devascularization showed that the isolated segments left in peritoneal cavity (together with their contents) were gradually destroyed and changed into a slight fibrous residue. The retaining of the up to 180 cm long segment did not endanger the life of experimental animals. This experience was used in the surgical treatment of inoperable tumours in left half of large intestine and in rectosigmoideum. The case report of four successful operations is given together with two cases of invagination of the devitalized part into intestinal lumen.

Adenocarcinoma, Scirrhous↗
PubMed1985

Experimental elimination of various intestinal segments by means of devascularization (devitalization).

Segments of the small and large intestine, of varying lengths (10-180 cm), were devascularized by simultaneously ligating the mesenteric arteries and veins. When the circulation had been cut off, the ends of the devascularized segment were both ligated, continuity of intestinal passage was renewed by forming an anastomosis and the isolated segment was left in situ, together with its contents. Contrary to accepted views, no changes leading to death (necrosis and peritonitis) occurred, but the devascularized tissue was progressively destroyed and reconstructed until, after four weeks, all that was left was a minute fibrous residue. None of 41 pigs died as a result of devascularization, including those in which large doses of pathogenic microorganisms were injected into the isolated segment. The possibility of employing this technique in the surgical treatment of inoperable tumours is discussed.

Animals↗