The health impact of stray and wild cats in the human environment]

The population of stray cats in towns expands due to irresponsible behaviour of humans who allow them to enter cellars, hot water canals, store rooms etc. As a result of frequent feeding some specimens become tame, lose their shyness and on contact with humans and domestic animals they can become the source of some infectious agents. The most important of thus transmitted diseases is rabies. Cats become infected from foxes on rubbish heaps on the periphery of communities. More than 60% of cases of rabies of domestic animals are found in cats. Toxoplasmosis--cats excrete the infectious stage of the causal agent in their excreta. In the same manner also the agent causing intestinal salmonelloses is excreted. More than 5% cats are infected. Via excreta also the causal agents of toxocariasis are spread--the larvae of cat thread worms settle in the internal organs of humans (larva migrans). The assumed incidence in cats is as high as 50%, as suggested also by the high positivity of specimens from children playgrounds. Stray cats may be the source of agents causing various dermatomycoses and of ectoparasites.     

Inhibition of platelet aggregation following chronic in vivo treatment of rats with nicotine: prevention by simultaneous application of propranolol

Platelet aggregability is known to be enhanced and platelet-survival time shortened in smokers when compared with nonsmokers. Up to now it is unknown which of the substances in tobacco smoke are responsible for these effects. To evaluate a possible role of nicotine, rats were chronically treated with the alkaloid (10 mg/kg/day), continuously released from subcutaneously implanted osmotic minipumps. Surprisingly, after 8 weeks, platelet sensitivity toward the aggregating stimulus adenosine 5'-diphosphate (ADP) was markedly reduced. The mean ADP concentration required to induce half the maximum rate of aggregation (EC50) was 0.88 mumol/L in nicotine-treated animals, as compared with 0.67 mumol/L in controls (p less than 0.002). Platelet aggregability remained normal when the rats were treated simultaneously with nicotine and the beta blocker propranolol (3.5 mg/kg/day); for these animals, the mean EC50 for ADP was 0.73 mumol/L. These results are suggestive of a catecholamine-mediated action of nicotine. However, neither the basal levels of cAMP in platelet-rich plasma, nor the cAMP levels attained after stimulation of platelet adenylate cyclase with prostaglandin E1 (PGE1), were affected by 8 weeks of treatment with nicotine or nicotine plus propranolol. No effect on platelet aggregation was observed when the rats were treated with nicotine for only 2 weeks, or when nicotine or nicotine plus cotinine were added to platelet-rich plasma in vitro in concentrations equal to those attained in vivo after 8 weeks. Thus, prolonged application of nicotine in vivo caused an inhibition of ADP-induced rat platelet aggregation presumably mediated by beta-catecholaminergic stimulation of platelets.(ABSTRACT TRUNCATED AT 250 WORDS)     

Analgesic nephropathy in Hungary: the HANS study.

BACKGROUND: The diagnosis of analgesic nephropathy has improved significantly with modern imaging techniques. We reviewed a large portion of the Hungarian dialysis population to obtain additional insight into the problem. METHODS: Twenty-two participating dialysis units enrolled 1400 patients on renal replacement therapy between 1 January 1995 and 1 January 1998. Patients with no known aetiology (n = 284) were interviewed and studied with renal imaging. We assessed the presence of decreased renal mass combined with either bumpy contours, papillary calcification, or both. The subjects studied were interrogated extensively. RESULTS: Our survey suggested analgesic nephropathy in 47 of 1400 patients (3.3%), 3-fold higher than the EDTA database estimate for Hungary. The analgesics most commonly abused were phenacetin-containing mixtures. The driving symptoms were mainly headache and joint pain. Cardiovascular complications were more common than in the rest of the dialysis population, independent of smoking and lipid values (P<0.01). CONCLUSIONS: Phenacetin should be banned. Our study results support the need for longitudinal cohort and case-control studies in Hungary.     

Value of small bowel double contrast enema in clinical interventions

The double contrast enema is the most effective morphological screening method for the evaluation of the whole small bowel. Its sensitivity is 85%, its specifity 96.7%. In specific clinical problems the number of pathological roentgen findings rises: from 34.4% when all indications are taken into consideration to 58% in indications specific to the small intestine such as Morbus Crohn or the malabsorption syndrome. Search for tumours and the double contrast of the small bowel in unclear gastro-intestinal bleeding are unproductive. The weak point of this screening method is the lower part of the small intestine. Therefore, the selective peroral or retrograde analysis of the terminal ileum supplement the contrast method. A precondition for good results is an adequate technical standard. Besides the clinical results some technical results are therefore discussed such as contrast medium quantities, examination and X-ray time, radiation exposure and influences on the image quality.     

Shunt nephritis with crescent formation

The case of a 17-year-old girl is reported, who presented shunt nephritis, 8 years after the ventriculo-atrial shunt insertion was made. Renal biopsy showed membranoproliferative glomerulonephritis. The symptoms of uremia mingled with those of chronic septic state. Persistent hypocomplementemia and cryoglobulinemia dominated the picture of the disease. At the beginning of the disease Staphylococcus aureus abunded in the blood culture. In spite of the therapy the general status of the patient declined steadily.     

Wegener's granulomatosis

A case of an unusual development of Wegener's granulomatosis is described. A long-term immunosuppressive therapy led to intermittent involution of the process, but finally a transformation to a new disease, for present qualified as "malignant histiocytosis" was the result. The cause of the transformation and the differentiation from other necrotising granulomas are discussed.     

Metastasierendes atypisches fibroxanthom oder malignes fibröses histiocytom

Zusammenfassung Anhand der Beobachtung eines metastasierenden fibrohistiocytären Tumors im Gesicht einer 76jährigen Patientin wird die differentialdiagnostische Problematik zwischen atypischem Fibroxanthom und malignem fibrösen Histiocytom dargestellt. Eine Differenzierung nach klinischen Kriterien, insbesondere durch einen schichtenspezifischen Sitz, kann wegen einer auch möglichen primären dermalen Lokalisation des malignen fibrösen Histiocytoms nicht erfolgen. Ebenso bietet das histopathologische Bild beider Affektionen kaum sichere Unterscheidungsmerkmale. Die Tumoren kennzeichnet im wesentlichen ein cellulärer Dimorphismus, der einerseits aus spindeligen fibroblastenähnlichen und andererseits aus histiocytenähnlichen Zellelementen besteht. Durch zusätzliche morphologische Parameter (pattern analysis) wie unscharfe Begrenzung, asymmetrisches und tiefes infiltratives Wachstum, Ulceration und Nekrose werden beim von uns beobachteten Tumor Kriterien der Malignität offensichtlich und weisen ihn als malignes fibröses Histiocytom aus. Es wird vorgeschlagen, diese Bezeichnung für das metastasierende atypische Fibroxanthom zu verwenden. Mit dieser Trennung behält der Begriff atypisches Fibroxanthom seine Bedeutung als überwiegend doch eher gutartiger Tumor.Die histomorphologische Variationsbreite fibro-histiocytärer Proliferationen hat je nach Ausprägung der cytologischen Strukturelemente ein breites Spektrum von Differentialdiagnosen zur Folge. Zu berücksichtigen sind bei Überwiegen der fibromatösen spindelzelligen Komponente das semimaligne Dermatofibrosarcoma protuberans, das cytologisch ebenso monomorphe Fibrosarkom mit fischzugartig angeordneten Tumorzellen und das spindelzellig differenzierte Kaposi-Sarkom, welches durch seinen angiomatösen Charakter unterscheidbar ist. Das Spindelzellcarcinom, ein besonders unreifes Plattenepithelcarcinom, imitiert sarkomähnliche Strukturen, kann aber wie das spindelzellige maligne Melanom durch Betrachtung der dermo-epidermalen Junktionszone vom atypischen Fibroxanthom abgegrenzt werden. Bei unreifen Liposarkomen und beim malignen Riesenzelltumor der Weichteile ermöglichen spezifische Zellelemente histogenetische Rückschlüsse.     

Efficacy of early treatment with toltrazuril in prevention of coccidiosis and necrotic enteritis in chickens

In the present study, efficacy of the toltrazuril treatment for prevention of coccidiosis and necrotic enteritis was tested. Ninety-six 14-day-old commercial broiler chickens were caged and divided into eight groups (n=12), designated groups 1 to 8. Chickens of groups 1 to 6 were inoculated orally at 18 days of age with 25,000 oocysts of Eimeria tenella and 75,000 oocysts of Eimeria brunetti. At 22 days of age, chickens of groups 1 to 6 were infected with 10⁹ colony-forming unit Clostridium perfringens. Chickens of group 1 were treated with 75 parts/10⁶ toltrazuril in drinking water for 8 h on two consecutive days up to 12 h before Eimeria infection, while chickens of groups 2 to 5 were treated with the same dose of toltrazuril at 12 h, 36 h, 60 h and 84 h after Eimeria infection, respectively. The non-treated group 6 served as a positive control. Chickens in group 7 were treated with toltrazuril at 17 and 18 days of age, and those of group 8 remained uninfected and non-treated as a negative control. The feed conversion ratio was higher in the positive control compared with other groups. The mortality rates were 16.8% and 41.7% in the late toltrazuril-treated (at 84 h) and infected non-treated chickens, respectively. Lesions scores of necrotic enteritis or coccidiosis in infected, non-treated chickens were significantly more severe compared with negative controls (P<0.01) and late toltrazuril-treated (at 84 h) chickens (P<0.05). In conclusion, application of toltrazuril before Eimeria challenge protected chickens from coccidiosis and indirectly from successive necrotic enteritis caused by C. perfringens infection.     

Bringing tendon biology to heel: Leveraging mechanisms of tendon development,healing, and regeneration to advance therapeutic strategies

Tendons are specialized matrix-rich connective tissues that transmit forces from muscle to bone and are essential for movement. As tissues that frequently transfer large mechanical loads, tendons are commonly injured in patients of all ages. Following injury, mammalian tendons heal poorly through a slow process that forms disorganized fibrotic scar tissue with inferior biomechanical function. Current treatments are limited and patients can be left with a weaker tendon that is likely to rerupture and an increased chance of developing degenerative conditions. More effective, alternative treatments are needed. However, our current understanding of tendon biology remains limited. Here, we emphasize why expanding our knowledge of tendon development, healing, and regeneration is imperative for advancing tendon regenerative medicine. We provide a comprehensive review of the current mechanisms governing tendon development and healing and further highlight recent work in regenerative tendon models including the neonatal mouse and zebrafish. Importantly, we discuss how present and future discoveries can be applied to both augment current treatments and design novel strategies to treat tendon injuries.