19 research outputs found

    Nawracaj膮ce cz臋stoskurcze komorowe torsade de pointes i wstrz膮s kardiogenny w przebiegu ci臋偶kiej niedoczynno艣ci tarczycy

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    W pojedynczych publikacjach wskazuje si臋 na mo偶liwo艣膰 wyst臋powania cz臋stoskurcz贸w typu torsade de pointes (TdP) i migotania kom贸r w przebiegu nabytego zespo艂u wyd艂u偶onego QT u chorych z niedoczynno艣ci膮 tarczycy. W niniejszej pracy przedstawiono przypadek 51-letniej kobiety z chorob膮 Hashimoto i niedoczynno艣ci膮 tarczycy, kt贸ra przyjmowa艂a za ma艂e dawki l-tyroksyny. Chor膮 przyj臋to do kliniki z objawami prze艂omu hipometabolicznego. Obserwowano objawy wstrz膮su, a w zapisach EKG bradykardi臋 zatokow膮, wyd艂u偶enie odst臋pu QT do 0,8 s i napadowe cz臋stoskurcze komorowe typu TdP, wywo艂ywane pobudzeniami dodatkowymi komorowymi typu R na T. W badaniach dodatkowych wykazano g艂臋bok膮 niedoczynno艣膰 tarczycy. Poniewa偶 farmakoterapia zaburze艅 rytmu serca i bradykardii by艂a nieskuteczna, za艂o偶ono elektrod臋 endokawitarn膮. Dzi臋ki stymulacji kom贸r z cz臋stotliwo艣ci膮 90/min uzyskano skr贸cenie odst臋pu QT, ust膮pienie zaburze艅 rytmu serca oraz objaw贸w wstrz膮su. Po 2 dobach podawania hydrokortyzonu i l-tyroksyny zaprzestano stosowania elektrostymulacji. Skorygowany odst臋p QT (QTc) wynosi艂 0,43 i nie wyd艂u偶a艂 si臋 istotnie w okresie dalszej wielomiesi臋cznej obserwacji, w trakcie odpowiedniej substytucji l-tyroksyn膮. Niedoczynno艣膰 tarczycy mo偶e by膰 przyczyn膮 gro藕nych dla 偶ycia zaburze艅 rytmu serca wt贸rnych do nabytego zespo艂u wyd艂u偶onego QT. Elektrostymulacja kom贸r by艂a w tym przypadku zabiegiem ratuj膮cym 偶ycie. (Folia Cardiologica Excerpta 2007; 2: 255-258

    Designing of compressed elements made of aluminium with the use of Eurocodes and calculation software

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    W艂a艣ciwa ocena stateczno艣ci og贸lnej elementu oraz prawid艂owe wyznaczenie si艂y krytycznej i no艣no艣ci z uwagi na wyboczenie pr臋t贸w poddanych dzia艂aniu osiowej si艂y 艣ciskaj膮cej decyduj膮 o poprawnym zaprojektowaniu ustroju pr臋towego. Opisane zagadnienia zwi膮zane s膮 z projektowaniem pr臋t贸w 艣ciskanych osiowo wed艂ug Eurokodu 9, wykonanych z kszta艂townik贸w aluminiowych. Prezentowany artyku艂 zwraca uwag臋 na r贸偶nice wynikaj膮ce z niew艂a艣ciwego stosowania program贸w do wymiarowania konstrukcji aluminiowych w wypadkach, gdy programy nie zawieraj膮 procedur Eurokodu 9, a jedynie baz臋 danych materia艂owych wyrob贸w aluminiowych.Adequate assessment of general stability of the element as well as appropriate determination of a critical force and load-bearing capacity due to buckling of bars subject to the impact of axial compressing force determine the appropriate designing of the bar system. The issues described in the article are connected with designing of axially compressed bars according to eurocode 9, made using aluminium shape sections. The article pays attention to the differences resulting from improper use of software for sizing aluminium constructions in cases where programmes do not include eurocode 9 procedures, and only a material database of aluminium products

    Faults of designing and using metal-glass structures

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    The aim of the article is taking a closer look at the problems concerning technical condition assessment with regard to correctness of project goals of structures metal-glass facade. Made is reference to the manner of their execution and proper functioning. The issue of accordance to good engineering practice of adapting changes in the system and adjusting the fitted solutions as reccomended by the producers. Above mentioned issues were dealt with given an example of high-rise building with applied curtain wall and a residential building where a filling structure is mounted

    Nematodes (Nematoda) in Polish Forests. I. Species Inhabiting Soils of Nurseries

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    The paper presents the results of the analysis of 472 soil samples collected in the 1986-1987 time period, from 209 forest nurseries located in different regions of Poland. In total, 119 species of nematodes belonging to 56 genera were found: 64 species considered as plant feeders - parasites of higher plants, 34 species classified as fungal, epidermal cell and plant root hair feeders, 12 species of predatory nematodes, 2 species of omnivorous and 6 species of bacterial feeders. The most frequent species was Aphelenchus avenae which occurred in 45% of samples, followed by Paratylenchus projectus 22%, A. saprophilus 21%, A. bicaudatus 20%, P. pachydermus 20%, Trichodorus sparsus 20%, Aphelenchoides composticola 18%, A. parietinus 18%, Pratylenchus crenatus 17%, Bitylenchus dubius 14%, and P. penetrans 11%. Several species were very abundant e.g. maximal population density (number of specimens in 200 cm3 of soil) of Cephalenchus hexalineatus was 3,180 individuals, of A. saprophilus 2,500 individuals, of Filenchus nemorosus 2,450 specimens, of Ditylenchus anchilisposomus 850 individuals, of Meloidogyne hapla 800 individuals, of Coslenchus costatus 560 individuals, of B. dubius 410 specimens, and of Roty-lenchus robustus 400 specimens. Nematode communities very poor in omnivorous and predatory species indicated that soil quality in the forest nurseries was very low. Such a finding means that seedlings could be less resistant to parasites and pathogens. The obtained results indicated that P. penetrans, R. robustus and species belonging to the family Trichodoridae could inhibit the growth of seedlings in nurseries
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