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Wyszukujesz frazę "cardiac function" wg kryterium: Temat


Wyświetlanie 1-10 z 10
Tytuł:
Cardiac abnormalities induced by benzene exposure from the flaring disaster at the BP refinery plant in Texas City
Autorzy:
D'Andrea, Mark A.
Garg, Nadish
Trehan, Shubham
Reddy, G. Kesava
Tematy:
pulmonary function
cardiac function
benzene poisoning
urinary phenol
flaring disaster
toxic emission
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/62240140.pdf  Link otwiera się w nowym oknie
Opis:
Objectives Benzene exposure is associated with multiple adverse health effects on the human’s biological systems including its cardiac, pulmonary, respiratory, renal, liver, and other organs’ function. The purpose of this study is to assess the adverse health effects of benzene exposure on the cardiac functions in subjects affected by a flaring incident at the British Petroleum (BP) refinery in Texas City, Texas, USA. Material and Methods A total of 1790 evaluable subjects who were exposed to benzene were included in the study. Using the patients’ medical charts, the authors analyzed the data on various heart rate parameters as well as on the pulmonary function, the serum levels of β2-microglobulin, and the amount of urinary excretion of phenol. Results Of the 1790 subjects, 1083 experienced some type of cardiac function abnormality as assed by electrocardiogram (EKG) testing following their exposure to benzene. Normal cardiac function was preserved in 707 subjects despite their exposure to benzene. Regardless of the changes in their overall cardiac function, most benzene exposed subjects experienced some changes in various heart rate parameters such as P wave duration, PR interval, PR segment, QRS duration, QT interval, QTC interval, P wave axis, QRS axis, and T wave axis. Similarly, alterations in their pulmonary function test (PFT), β2-microglobulin levels, and urinary excretion of phenol were observed in benzene exposed subjects regardless of the changes in cardiac function. Furthermore, the incidence of the abnormality of various heart rate parameters was found to be 2–10 fold higher in the benzene exposed subjects compared with the general population. Conclusions Environmental benzene exposure from the BP flaring incident pose significant health risks including specific alteration in cardiac and pulmonary functions in those subjects exposed to benzene.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obrazowanie metodą rezonansu magnetycznego w badaniach funkcji serca w mysim modelu niewydolności serca
Magnetic resonance imaging in cardiac function experiments in a mouse model of heart failure
Autorzy:
Obrzud, Jowita
Opis:
Niewydolność serca jest jedną z najczęstszych przyczyn zgonów na świecie. W celu lepszego zrozumienia mechanizmów patologii układu sercowo-naczyniowego wykorzystuje się szereg zwierzęcych modeli tych chorób, w tym te oparte na myszach laboratoryjnych. Ze względu na znacznie mniejsze rozmiary ciała myszy (ok 30 g dla dorosłego osobnika), a przez to mniejsze rozmiary anatomiczne serca u myszy, niezbędne jest zastosowanie dedykowanych metod obrazowania funkcji serca o odpowiedniej czułości i przestrzennej zdolności rozdzielczej.Obrazowanie magnetycznego rezonansu jądrowego (MRI) jest bezinwazyjną metodą obrazowania funkcji tkanek i narządów która może być użyta w celu szczegółowej charakteryzacji zmian zachodzących w trakcie rozwoju niewydolności serca. W niniejszej pracy zbadano możliwości ilościowej oceny zmian w funkcji lewej komory serca opartą o analizę dynamiki skurczu i rozkurczu lewej komory w trakcie cyklu pracy serca w mysim modelu niewydolności serca. Jako model zwierzęcy wykorzystano myszy genetycznie modyfikowane E3L.CETP które spontaniczne rozwijają dyslipidemię o charakterze zbliżonym do tej obserwowanej u pacjentów klinicznych. Do badań wykorzystano mysz w wieku 8 i 40 tygodni, samce i samice. Do oceny funkcji serca wykorzystano wysokopolowy (B0=9.4T) skaner MRI dedykowany do pomiarów małych zwierząt. W celu dynamicznego zobrazowania funkcji lewej komory wykorzystano sekwencję szybkiego echa gradientowego z bramkowaniem retrospektywnym. Do ilościowej oceny funkcji serca wykorzystano pomiar pojemności lewej komory w skurczu i rozkurczu oraz pochodne ich parametry (rzut serca, frakcja wyrzutowa, rzut serca, pojemność minutowa) jak również analizę krzywych objętość lewej komory – czas, na podstawie których oszacowano szybkość wyrzutu i napełniania lewej komory. Zaobserwowano szereg zmian w w.w. parametrach które zależą od wieku i płci myszy.
Heart failure is one of the most common causes of death worldwide. In order to better understand the mechanisms of cardiovascular pathology, a number of animal models of these diseases are being used, including those based on laboratory mice. Due to the much smaller body size of mice (about 30 g for an adult individual), and thus the smaller anatomical size of the heart in mice, dedicated imaging methods for cardiac function with adequate sensitivity and spatial resolution are necessary.Nuclear magnetic resonance imaging (MRI) is a non-invasive imaging method that can be used to characterize in detail the changes that occur during the development of heart failure. In the present study, we investigated the potential for quantitative assessment of changes in left ventricular function based on analysis of left ventricular systolic and diastolic dynamics during the cardiac cycle in a mouse model of heart failure. As an animal model, we used genetically modified E3L.CETP mice that spontaneously develop dyslipidemia that corresponds to that observed in clinical patients. Mice of 8 and 40 weeks of age, male and female, were used for the study. A high-field (B0=9.4T) MRI scanner dedicated to small animal measurements was used to assess cardiac function. A fast gradient echo sequence with retrospective gating was used to dynamically image left ventricular function. To quantitatively assess cardiac function, we used measurements of left ventricular volume in systole and diastole and their derived parameters (cardiac output, ejection fraction, cardiac output, minute volume) as well as analysis of left ventricular volume-time curves, from which left ventricular ejection and filling rates were estimated. Several changes were observed in the aforementioned parameters which depend on the age and sex of the mice.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Comprehensive MRI for the detection of subtle alterations in diastolic cardiac function in $apoE/LDLR^{-/-}$ mice with advanced atherosclerosis
Autorzy:
Orzylowska, Anna
Bar, Anna
Jasztal, Agnieszka
Skorka, Tomasz
Jasinski, Krzysztof
Kostogrys, Renata
Tyrankiewicz, Urszula
Jablonska, Magdalena
Chłopicki, Stefan
Opis:
$ApoE/LDLR^{-/-}$ mice represent a reliable model of atherosclerosis. However, it is not clear whether cardiac performance is impaired in this murine model of atherosclerosis. Here, we used MRI to characterize cardiac performance in vivo in $apoE/LDLR^{-/-}$ mice with advanced atherosclerosis. Six-month-old $apoE/LDLR^{-/-}$ mice and age-matched C57BL/6J mice (control) were examined using highly time-resolved cine-MRI [whole-chamber left ventricle (LV) imaging] and MR tagging (three slices: basal, mid-cavity and apical). Global and regional measures of cardiac function included LV volumes, kinetics, time-dependent parameters, strains and rotations. Histological analysis was performed using OMSB (orceine with Martius, Scarlet and Blue) and ORO (oil red-O) staining to demonstrate the presence of advanced coronary atherosclerosis. MR-tagging-based strain analysis in $apoE/LDLR^{-/-}$ mice revealed an increased frequency of radial and circumferential systolic stretch (25% and 50% of segments, respectively, p≤0.012), increased radial post-systolic strain index (45% of segments, p=0.009) and decreased LV untwisting rate ($-30.3^{o}$ ($11.6^{o}$)/cycle, p=0.004) when compared with control mice. Maximal strains and LV twist were unchanged. Most of the cine-MRI-based LV functional and anatomical parameters also remained unchanged in $apoE/LDLR^{-/-}$ mice, with only a lower filling rate, longer filling time, shorter isovolumetric contraction time and slower heart rate observed in comparison with control mice. The coronary arteries displayed severe atherosclerosis, as evidenced by histological analysis. Using comprehensive MRI methods, we have demonstrated that, despite severe coronary atherosclerosis in six-month-old $apoE/LDLR^{-/-}$ mice, cardiac performance including global parameters, twist and strains, was well preserved. Only subtle diastolic alterations, possibly of ischemic background, were uncovered.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Ticagrelor effectively inhibits platelet aggregation in comatose survivors of cardiac arrest undergoing primary percutaneous coronary intervention treated with mild therapeutic hypothermia
Autorzy:
Tomala, Marek
Zajdel, Wojciech
Stępień, Ewa
Legutko, Jacek
Trąbka-Zawicki, Aleksander
Żmudka, Krzysztof
Machnik, Andrzej
Nawrotek, Bartłomiej
Opis:
Background: Mild therapeutic hypothermia (MTH) is believed to reduce the effectiveness of antiplateletdrugs. Effective dual-antiplatelet therapy after percutaneous coronary intervention (PCI) is mandatoryto avoid acute stent thrombosis. The effectiveness of ticagrelor in MTH-treated out-of-hospital cardiacarrest (OHCA) survivors is still a matter of debate. The aim of the study was to evaluate the impactof MTH on the platelet-inhibitory effect of ticagrelor in comatose survivors of OHCA treated with primaryPCI. Methods: Eighteen comatose survivors of OHCA with acute coronary syndrome undergoing immediatePCI treated with MTH were compared with 14 patients with uncomplicated primary myocardial infarctionafter PCI, matched for gender and age, in a prospective, single-center, observational study. Plateletaggregation was evaluated using VerifyNow P2Y12 point-of-care testing at 3 time points: admission (T0),during MTH (T1), and 48–72 h after rewarming (T2). Results: Ticagrelor effectively inhibits platelet aggregation in OHCA patients subjected to MTH andin all patients in the control group. The effectiveness of ticagrelor did not differ between the MTH groupand the control group (p = 0.581). In 2 cases in the MTH population, the platelet response to ticagrelorwas inadequate, and in one of them it remained insufficient during the re-warming phase. There wasno stent thrombosis in these patients. Conclusions: The present study confirmed the effectiveness of ticagrelor to inhibit platelets in myocardialinfarction patients after OHCA treated with primary PCI undergoing hypothermia. The use ofcooling was not associated with an increased risk of stent thrombosis.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Impairment of pulmonary function and changes in the right cardiac structure of pneumoconiotic coal workers in China
Autorzy:
Bian, Lu-Qin
Zhang, Yue
Jiang, Rong
Mao, Ling
Tematy:
coal worker’s pneumoconiosis
pulmonary artery systolic pressure
pulmonary function
right cardiac structure
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/2177031.pdf  Link otwiera się w nowym oknie
Opis:
Introduction: Information on the changes of pulmonary function and the right cardiac structure in patients with coal worker’s pneumoconiosis in China is very scarce. This study was performed to clarify the changes of pulmonary function and right cardiac structure in patients with coal worker’s pneumoconiosis in China. Material and methods: Pulmonary function, pulmonary artery systolic pressure, and the right cardiac structure were evaluated by spirometry and color Doppler echocardiography. Results: The pulmonary artery systolic pressure of patients with coal worker’s pneumoconiosis was increased with disease severity. Patients with coal worker’s pneumoconiosis also exhibited an impaired pulmonary function and altered right cardiac structure compared with control subjects. A significant linear correlation of the variables of pulmonary ventilation and diffusion function with the indicators of the right cardiac structure was found in patients with coal worker’s pneumoconiosis in China. Conclusions: This study elucidated a deterioration of pulmonary function and right cardiac structure in patients with coal worker’s pneumoconiosis in China.
Dostawca treści:
Biblioteka Nauki
Artykuł
Autorzy:
Zerebiec, Katherine
Chyrchel, Bernadeta
Rożanowska, Agnieszka
Davies, Cecilia
Czestkowska, Ewa
Surdacki, Andrzej
Opis:
Left ventricular hypertrophy (LVH) is traditionally considered a physiological compensatory response to LV pressure overload, such as hypertension and aortic stenosis (AS), in an effort to maintain LV systolic function in the face of an increased afterload. According to the Laplace law, LV wall thickening lowers LV wall stress, which in turn would be helpful to preserve LV systolic performance. However, numerous studies have challenged the notion of LVH as a putative beneficial adaptive mechanism. In fact, the magnitude of LVH is associated with higher cardiovascular morbidity and mortality, especially when LVH is disproportionate to LV afterload. We have briefly reviewed: first, the importance of non-valvular factors, beyond AS severity, for total LV afterload and symptomatic status in AS patients; second, associations of excessive LVH with LV dysfunction and adverse outcome in AS; third, prognostic relevance of the presence or absence of pre-operative LVH in patients referred for aortic valve surgery; fourth, time course, determinants and prognostic implications of LVH regression and LV function recovery after surgical valve replacement and transcatheter aortic valve implantation (TAVI) with a focus on TAVI-specific effects; fifth, the potential of medical therapy to modulate LVH before and after surgical or interventional treatment for severe AS, a condition perceived as a relative contraindication to renin-angiotensin system blockade.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Prawne podstawy stwierdzania śmierci
Legal basis of determination of death.
Autorzy:
Dudzic, Mateusz
Opis:
Presented thesis concerns legal basis of determination of death in the Polish law and the applicable definition of death.The wide recognition of the problem of death, has been divided into chapters dealing with the medical aspects, ethical considerations and legal situation in selected jurisdictions. I have thoroughly discussed the two main acts, that are legal grounds for the definition of death - the notice on the criteria and methods of finding permanent irreversible cessation of brain function, and the notice on the criteria and method of statements irreversible cardiac arrest. Both documents have been evaluated and criticized on the level of medical, ethical and legal issues. Thesis presents also problems arising from the existence of several definitions of death, diagnostic differences and controversies that raise from new guidelines around the world.
Praca dotyczy podstaw stwierdzania śmierci w prawie polskim i obowiązujących definicji śmierci. Szeroki problem jakim jest rozpoznawanie zgonu podzielony został na rozdziały traktujące o jego medycznych aspektach, etycznych uwarunkowaniach oraz sytuacji prawnej w Polsce i wybranych systemach prawnych. Dokładnie omówione zostały dwa główne akty będące podstawami legalnych definicji śmierci - obwieszczenie w sprawie kryteriów i sposobu stwierdzenia trwałego nieodwracalnego ustania czynności mózgu oraz obwieszczenie w sprawie kryteriów i sposobu stwierdzenia nieodwracalnego zatrzymania krążenia. Oba dokumenty zostały poddane ocenie i krytyce na płaszczyźnie medycznej, etycznej i prawnej. Przedstawione zostały także problemy wynikające z istnienia kilku definicji śmierci, różnic diagnostycznych i kontrowersji jakie wzbudzają nowe wytyczne na całym świecie.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
    Wyświetlanie 1-10 z 10

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