Biomedical subjects
Publications and source records attributed to T Tóth.
A non-tumoral stenosis of the gastrointestinal tract (after rectum resection) was treated successfully with CO2 laser. The case was not suitable for classic surgical resection.
Computer simulations of the spontaneous pacemaker oscillations observed in thalamocortical (TC) cells were performed using a biophysical model that included the low voltage activated, Ca2+ current, IT, and the mixed Na+/K+, inward rectifying current, Ih. The simulations accurately reproduced the waveform and voltage-dependence of the pacemaker oscillations, hence the transition from tonic firing to burst firing which is a peculiar feature of the electrical activity of TC cells both in vivo and in vitro. The results provide further support to the suggestion that IT and Ih are essential for the presence of the pacemaker oscillations, and indicate that our model is a useful tool for the study of spontaneous, low-frequency oscillatory activities in TC cells.
Intestinal lesions were produced experimentally by heating the eventrated loop of the small intestine of Wistar rats in 44 degrees C 0.9% saline 20 minutes. Luminal haemorrhage and elevation of the potassium concentration in the wash-out fluid were registered from the fifth minute of the experiment. In the sediment of the wash-out fluid erythrocytes, degenerated and necrotic epithelial cell clusters were found. Histologically the mildest lesions were subnuclear vacuolization of the epithelial cells and stromal oedema of the villi. In the medium-degree lesion subepithelial cleft formation, desquamation of the epithelial cells and denudation of the villi occurred. The fully developed lesion was characterized by the destruction of the villi intestinalis and haemorrhage. This lesion produced by local heating differs from the intestinal lesions of the rats exposed to high environmental temperature basically in the haemorrhagical nature of the former lesion.
The Nd:YAG and CO2 laser can be used with benefit in the surgery of the liver, biliary tract and pancreas. The Nd:YAG laser is most suitable for cutting parenchymatous organs, as e.g. the liver. In biliary surgery the CO2 laser can be recommended. Based on their 12 cases, authors discuss the applicability of CO2 laser.
Authors have performed 29 septic operations by a TLS61 60 W CO2 laser apparatus. In accordance with international experience, favorable results have been obtained in laser surgery of vascularized, hemophilic and bacterium penetrated alterations and infected wounds.
Rare dermatoglyphical patterns of fingers and palms of 26 different Hungarian population groups (males; 3207 individuals, 6414 hands) are compared with that observed in some population groups from the USSR (Buriats, Chookhchees, Kazakhs, Mansi and Komi), Khalkha-Mongolians, and Ethiopians (altogether 838 male individuals, 1676 hands). These patterns are: Radial loops on IV. and V. fingers, absence of triradius "d" on the palms, Ar,Lu and W + S on the hypothenar, Lc/Lr (Bettmann figure) and W + S on the thenar/I, and W on II., III. and IV. interdigital pads. It is pointed out that in addition to population studies these rare traits may also be used in genetic investigations (twin studies) as well as in forensic anthropology (disputed paternity).
The authors have performed 29 septic operations with a TLS61 CO2 surgical laser with 60 Watt output power. They have gained good experiences with the laser excision of the vascularized, bleeding, inflammated, penetrated by bacteries and infected wounds.
The author has analysed the renal alterations in 8 patients, each of whom died of renal failure. Extracapillary crescents had developed in more than 50% of the glomeruli in all of them. Renal symptoms followed those of endocarditis after two weeks. Proteinuria, haematuria and impairment of renal functional parameters featured the clinical course of the disease. From the haemoculture, bacteria (in 6 cases) and fungus (in one case) were isolated. Haemoculture was negative in one case. The obtained serum complement values, intraglomerular immunoglobulin and/or complement depositions, electron-dense deposits along the glomerular basement membrane and within the mesangium all proved the presence of an immunocomplex mechanism. The rapid course leading to renal failure can be explained by the abundant crescent formation.
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The applicability of TLS61 CO2 developed in Hungary was investigated in dermatological-plastic surgery. This apparatus can be used with benefit in certain plastic operations, like lipectomy, dermabrasion, removal of keloid-tattoo and skin excisions.
This paper presents a rare type of renal cystic disease involving the Bowman's capsule: the glomerulocystic disease associated with multiple malformation. Etiology or pathogenesis of glomerulocystic kidney remained unclear.
A 6 h immobilization stress was found to be lethal for rats weighing 125 g in average. Stress of 4 h was sublethal for the majority of these rats, however, simultaneous administration of adrenaline turned the sublethal effect to lethal. Death occurred in the fifth or sixth hour measured from the beginning of the stress, independently of the fact whether the stress was going on or not. Severe morphological changes in the heart muscle, lungs and kidneys were found.
Twenty-five cases of extracapillary crescentic glomerulonephritis were examined immunohistologically. The peroxidase-antiperoxidase (PAP) method was used, the presence of immunoglobulin, complement factors and fibrin was analysed and glomerular positivity was found in all but two cases. Two types of reaction could be discerned: linear and granular, which can be considered as evidence of the pathomechanism. Surprisingly, IgG and IgM positivity was seen most frequently. The author emphasizes the importance of immunoperoxidase examination in the renal histology. This method can be easily applied in paraffin-embedded samples and gives many useful information.
Intraglomerular embolization by tubular epithelial cell is a rare artefact found in needle biopsy specimens. The authors have observed this phenomenon in five out of 300 renal biopsy cases. Tubular epithelial cells, were present in the glomerular capillaries (in two cases) or in the capillaries and within the glomerular urinary space (in three cases).
Favourable results obtained by using the RT TLS61 CO2 laser of TUNGS-RAM, of a performance of 60 W are reported. It is emphasized that the device has several advantages in surgical gastroenterology over the traditional cutting instruments. The light of the device coagulates the smaller than 0.5 mm vessels during cutting. On opening the gastrointestinal tract-contrary to electrocautery-the necrotic zone is narrower, which may be of importance from the point of view of suture insufficiency. The device provides more favourable conditions for ablastic operations than do the traditional cutting instruments.
An unusual type of gastric lesions, clearly different from erosions, was produced in rats by prolonged immobilization and application of adrenaline at the first and the third hour of stress. The lesions are large, round, highly hyperaemic elevations of the glandular part of the rat stomach. Necrosis of the superficial 2/3 of the mucosa with haemorrhages and leucocytic infiltration as well as marked oedema, focal haemorrhages, necrotic vasculitis and darkly stained phagocytes in the submucosa are the most prominent histological features of it. Some special conditions seem to be necessary for the development of this "superficial gastric necrosis".
The number of gastric erosions induced experimentally by immobilization stress were observed following norepinephrine treatment. We revealed a significant reduction of the number of erosions. This indicates the protective effect of sympathetic nervous system in the pathogenesis of stress-induced erosions.
Author has studied in 5 needle-biopsy and 25 autopsy samples the wall unevennesses of the glomerular capillary loops developing in kidney amyloidosis. In all cases subepithelial spikes consisting of parallel amyloid fibres were observed. In half of the cases, similar structures occurred also subendothelially. In silver-stained preparations they were readily identified by their increased argyrophilia. In all cases nodular features composed of irregular amyloid fibres were subendothelially present resulting in a considerable narrowing of the lumen. The spikes and nodules causing the unevenness of the basement membrane are of diagnostic value in glomerular amyloidosis.