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Biomedical subjects

J Benes

Publications and source records attributed to J Benes.

At least 19 recordsLinked to original sources
PubMed1996

Immunosuppressive activity of bovine seminal ribonuclease and its mode of action.

Two preparations of dimeric BS RNase-native and recombinant proteins caused identical immunosuppressive effects on MLC-stimulated human lymphocytes. The monomers of RNase A and BS RNase were ten times less active. The inhibitory effect on MLC-stimmulation was followed by 90% inhibition of cell-mediated lympholysis (CML) caused by BS RNase (10 micrograms/ml). This effect indicated that BS RNase suppressed the recognition phase of the cytotoxic reaction, resulting in inhibition of generation of cytotoxic effector cells. BS RNase exerted a similar effect on generation of cytotoxic LAK cells. Cytotoxic activity of LAK cells or CTLs against K562 target cells was abrogated only when BS RNase was added at the beginning of the sensitizing phase, but the cytotoxicity of effector cells in the destruction phase was not influenced. The effect of RNase A on the generation of cytotoxic cells was much less pronounced. To get more information about the site of action, the effect of BS RNase on early lymphocyte stimulation by PHA was investigated by using fluorescein cell probes. BS RNase (100 micrograms/ml) prevented a shift in fluorescein emission occurring within one hour of activation using fluorescein diacetate as a marker for changes in the cytoplasmic matrix. On the contrary, it did not block the shift in fluorescence emission when tested with diphenylhexatrien as a marker for changes in membrane fluidity. Furthermore the effect of BS RNase on expression of membrane antigens expressed on activated human lymphocytes was estimated. BS RNase significantly inhibited the expression of CD25, CD38 and CD71 antigens on PHA-, Con A- and MLC-stimulated human T and B lymphocytes. No substantial change in expression of these antigens was observed on IL-2-stimulated cells, but DNA synthesis was totally abrogated. These results indicate that the mode of action of BS RNase on activated T and B lymphocytes is based mainly on the suppressed expression of receptors for interleukin-2-alpha-chain and transferrin.

ADP-ribosyl Cyclase↗
PubMed1995

[Treatment of pancreatic stones with extracorporeal lithotripsy with sonographic localization].

BACKGROUND: Pancreatic stones may be treated by endoscopic extraction or by surgery. Extracorporeal shock wave lithotripsy increased possibility of noninvasive steps to their elimination. The aim of this study was to describe our first experience with this method. METHOD AND RESULTS: 10 patients (6 men and 4 women) in average age 47 years (between 19 to 72 years) were treated. The lithotriptor MEDILIT with sonographic targeting was used for fragmentation of pancreatic stones. Fragmentation was achieved in 8 patients, in 4 cases we observed spontaneous disappearnace, in 3 cases an endoscopic extraction of fragments was necessary. In one case good fragmentation was observed at control ECRP, but the repeated Wirsungography showed a big pseudocyst which had not been diagnosed at the first examination and surgery was necessary. In 2 cases no fragmentation was achieved and in these cases surgery was also indicated. No serious side effects were observed, nor elevation of amylase values compared with the situation before the shock wave treatment. CONCLUSIONS: Extracorporeal shock wave lithotripsy of pancreatic stones revealed good fragmentation and disappearance stone from ductus Wirsungi without serious side effects on clinical course and surrounding soft tissues.

Adult↗
PubMed1994

[Prophylaxis of infectious endocarditis].

In spite of introducing antibacterial agents in prophylaxis of infective endocarditis (I.E.) more than 50 years ago, the optimal scheme for indication and application of the prophylaxis has not been solved. Evidences accumulate that prophylaxis (being developed to cover some medical procedures leading to bacteremia) can prevent only a small part (< 10%) of cases of I.E. The most effective protection from I.E. is the systematic care for gums and mucosae of the mouth cavity.

Anti-Bacterial Agents↗
PubMed1993

[Perianal pyoderma].

Perianal pyoderma (hidradenitis suppurativa-acne conglobata) is a chronic disease which in its progressive form cannot be treated by conservative methods. Extensive suppurative foci must be radically excised incl. all systems of fistulas right down to the fascia and the defects which develop are allowed to heal per secundam or after several weeks they can at a different period of time be covered by a skin transplant. The authors present their 30-year experience with surgical treatment of 39 patients. Treatment was in all instances successful after radical surgical excision. All these patients have fully recovered as regards work capacity as well as social aspects.

Adolescent↗
PubMed1992

[Energy expenditures in patients with acute and chronic catabolic conditions].

The authors investigated the energy expenditure and utilization of different nutrients by indirect calorimetry. They examined three groups of subjects: patients with acute febrile diarrhoeal diseases (n = 36), patients with subacute to chronic severe febrile diseases (n = 10) and healthy subjects (n = 21). The measurements were made three times a day. In all groups the energy requirements of the organism were met in the morning above all by fats, in the course of the day the ration of utilized carbohydrates increased markedly. The authors discuss the problem of optimal nutrition of patients in a critical condition from the quantitative and qualitative aspect.

Acute Disease↗
PubMed1991

Treatment of a gastric bezoar by extracorporeal shock wave lithotripsy.

A bezoar of the stomach was diagnosed by X-ray and endoscopy in an 8-year-old boy who presented with intermittent dull epigastric pain. Attempts at endoscopic extraction failed because of the size and hardness of the bezoar. Extracorporeal shock wave lithotripsy was therefore applied using ultrasound to locate the bezoar. Disintegration of the bezoar and spontaneous evacuation of the fragments was achieved.

Bezoars↗
PubMed1991

[Treatment of kidney stones using shock-wave lithotripsy with sonographic control].

Lithotripsy by means of an extracorporeal shock-wave was performed in 128 patients with urolithiasis. In this group for the first time in Czechoslovakia ultrasound control of kidney stones was used in 44 patients; in the remainder X-ray control was used. The authors used equipment designed and manufactured locally. The ultrasonic probe is laterally connected with the shock-wave applicator. Disappearance of the fragments after lithotripsy was achieved in 39 patients where ultrasonic control was used. The paper presents the results, discusses the advantages and limitations of ultrasonic control in extracorporeal lithotripsy of urolithiasis.

Adult↗
PubMed1990

[Analgesia in extracorporeal shock wave lithotripsy. Experience with a lithotripsy apparatus made in Czechoslovakia].

The authors describe their experience with the use of analgesia during lithotripsy by an extracorporeal impulse wave (LERV). They made a total of 253 lithotripsies in various indications in a total of 150 patients. Most frequently ataracoanalgesia was administered (a combination of diazepam and phentanyl), however, administration of midazolam (Dormicum) is also adequate. This is due among others to the favourable physical properties of the impulse waves generated by the apparatus used. In the discussion the authors give a brief account of the causes of painfulness of LERV, based on contemporary ideas and experience.

Analgesia↗
PubMed1990

[Shock-wave lithotripsy in the treatment of 12 patients with choledocholithiasis using an apparatus manufactured in Czechoslovakia].

Lithotripsy by shock wave was performed in 12 patients with choledocholithiasis using the authors' own apparatus. The shock wave is created by an electric spark and the concentration is made by a rotational semi-elipsoid. The pressures attained in the second focus are 150 MPa. The focusing of the stones and the setting to the site of maximal pressures is made by means of two X-ray projections. Patients were indicated for the procedure when the method of endoscopic extraction had failed. Before the procedure a nasobiliary drain was inserted and after administration of analgesia on average 520 shocks were applicated. During the procedure no complications were observed. Fragmentation was achieved in 11 patients. Spontaneous release of fragments was recorded in five of the patients and in 6 during the check-up ERCP endoscopic extraction was made.

Adolescent↗
PubMed1989

[Disruption of biliary calculi in vitro with low amplitude shock waves and verification by chemical dissolution].

In lowering the amplitude of pressure in the point of the shock-wave concentration under MPa (in our equipment by means of lowering discharge tension under 8 kV) macroscopically observable breakdown of stones in vitro after passage of 5 shock-waves will not occur in approximately 1/3 of bile stones. After effect of 5 shock-waves cholesterol elution in model solvents was accelerated. In exposed parts of stones the cholesterol concentration was in the 40th minute in methanol and perchlorethylene solution in 9:1 ratio 2.45 times higher on average. The stones were halved by a diamond knife. Only one half was exposed and the other one was used for comparison. From the study were eliminated such halves of stones that were macroscopically damaged after the shock-wave exposition where acceleration of cholesterol elution is a priori obvious.

Cholelithiasis↗
PubMed1989

[A simple model for verifying the effects of a focused shock wave from our generator on erythrocytes and lymphocytes].

Biological effects of the focused shock wave produced by the generator of our own construction were observed on the erythrocyte and lymphocyte suspension as a model. Erythrocyte haemolysis located into the small volume of the 1.4 ml focus was observed in the dependence on the number of shocks. After 10 shocks it does not exceed 15%. In the previous experiments this particular dosage caused a complete destruction of the bile stone of about 1 cm size. Increase of kalium concentration in correspondence to the degree of haemolysis was discovered in the erythrocyte suspension. Effects of shock wave were observed also in lymphocytes, where no change of blastic transformation in the decrease of the life span approximately by 2% was proved. Regular measurements proved minimum damage of blood cells in given experimental conditions and the results are comparable with biological effects of other sources of the focused shock wave.

Erythrocytes↗