Dysrhythmia update. Case study: analysis of dual chamber rate responsive pacing in atrial fibrillation

This article presents a case study of a patient who required a dual chamber rate responsive pacemaker to assist in managing atrial fibrillation. The patient developed significant bradycardia when treated with the dose of propafenone required to convert atrial fibrillation, so the pacemaker was inserted. An example of a paced rhythm is presented and a differential diagnosis approach is used to discuss the possible interpretations of the rhythm. A brief explanation of the actual cause of the observed paced rhythm is presented.     

Mycotoxicosis in chicks produced by toxins from Phomopsis sp. or Diaporthe phaseolorum var. sojae

The possibility of producing toxic effects in day-old chicks with mycotoxins from Phomopsis sp. or Diaporthe phaseolorum var. sojae isolates was studied. Evidence was found that Phomopsis sp., but not Diaporthe, produces hepatic necrosis with high mortality in chicks. Enzymatically, the hepatotoxin produced by Phomopsis sp. caused an increase in the level of liver glucose-6-P dehydrogenase. Mycotoxicosis caused by Phomopsis sp. was compared with lupinosis.     

Bacterial catalytic processes for transformation of metals

Microorganisms actively participate in the transformation of metals and metalloids by various processes including adsorption, absorption, alkylation, oxidation and reduction reactions. Bacteria of the genera Thiobacillus and Sulfolobus have a chemolithotrophic mode of metabolism and catalyze various metal transformations. These bacteria are primarily involved in oxidation-reduction reactions of metals. Metal sulfides can be either directly oxidized by the microbes or oxidized by ferric iron, an end-product of microbial metabolism. These processes result in solubilization of iron, copper, molybdenum, uranium, and many other metals as well. Bacteria capable of these reactions are found, and they function in a variety of environments. Conditions which favor their growth are acidic pH (1.5 to 3.5) and temperatures which can be as high as 75 degrees C for Sulfolobus. The microbes have potential for mobilization of pollutants, or toxic elements, during resource extraction processes. In the absence of oxygen, iron, molybdenum and chromium may be reduced by microbes.     

Synovial-type (group II) phospholipase A2 human seminal plasma

Phospholipase A2 (PLA2) was analysed in seminal plasma of fertile, subfertile, and vasectomized men as well as in prostatic secretion and tissue. Immunological cross-reactivity was observed between synovial-type PLA2 antiserum and the enzyme present in seminal plasma. There was a highly significant correlation between the concentration of the synovial-type PLA2, as measured by a time-resolved fluoroimmunoassay and the catalytic activity of the PLA2. The results show that the PLA2 content in human seminal plasma is very high (approximately 1000 times of that present in blood plasma) and that the enzyme belongs to the synovial-type group II phospholipase A2. The results also indicate that the enzyme is secreted by the prostate.     

Manipulator system performance measurements

This paper presents results of man-in-the-loop tests of manipulator systems. These tests were performed as part of an effort to specify man-machine interface requirements for earth orbital teleoperator systems. The entire test sequence was designed to permit quantitative evaluation of a manipulator system in terms of general manipulative tasks and tasks specifically required for remote servicing of satellites. Comparison tests were carried out using two existing manipulators and control systems to perform a fine positioning task.     

Chronic bronchitis--alterations of the bronchial mucosa

The mucociliary transport system is usually an important defense system which protects the body against a variety of noxious agents. Reactions of the bronchial mucosa to chronic infections are seen in the ciliated cells, the amount of globlet cells, in modifications of the basement membrane underlying the bronchial epithelium and an altered percentage of inflammatory cells. In ciliated cells the following atypia can be seen: thickening of the ciliar membrane, swollen cilia, formation of compound cilia, disarrangement of microtubules. Common alterations of the basement membrane are: increased diameter of the basement membrane zone, inhomogeneous staining pattern of the basement membrane zone, formation of cytoplasmatic protrusions, formation of double layers of the basement membrane and increased number of cytoplasmatic bound vesicles. Structural abnormalities of the basement membrane will lead to disturbances of the zone of transition and have to be interpreted as a sign of disregulation in the process of diffusion and resorption. The inflammatory response of the epithelium during chronic bronchitis and asthma shows many similarities. The bronchial epithelium has a specific reaction pattern which supports the response against different noxious agents. So all findings have to be interpreted as unspecific pathological changes. All alterations may show different degrees of severity and are dependent on individual pattern and the severity of chronic process. Electronmicroscopical examinations in combination with lightmicroscopical findings and immuno-histochemistry and seen in context with clinical data help to understand the mechanism of the inflammatory process.     

Meeting the bereavement needs of kids in patient/families--not just playing around

Children grieve differently than adults. Although the unit of care in hospice is the patient and family, emphasis is often on the grown members of the family and the anticipatory grief and bereavement needs of children and adolescents are sometimes not met adequately. In this paper, hands-on strategies for working with children both before and after a significant death are presented, as well as appropriate context information on the grieving process for youth under age 18.