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Wyświetlanie 1-10 z 23
Tytuł:
Computer modelling of vascular systems
Autorzy:
Krętowski, M.
Bézy-Wendling, J.
Tematy:
computer modelling
vascular system
angiogenic process
Pokaż więcej
Wydawca:
Politechnika Gdańska
Powiązania:
https://bibliotekanauki.pl/articles/1965822.pdf  Link otwiera się w nowym oknie
Opis:
A model of the vascular system perfusing an internal organ is presented in the paper. The system's development is driven by the increasing needs of growing tissue. The modelled network consists of 2 or 3 (in the case of the liver) vascular trees connected on the macro-cell level. Each appearance of a new macro-cell activates an angiogenic process. The geometry of newly formed vessels is determined as a result of local optimization of the bifurcation volume. The model can simulate modifications of the vascular network caused by pathological processes.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symmetry and asymmetry in atherosclerosis
Autorzy:
Kolaszyńska, Oliwia
Lorkowski, Jacek
Tematy:
symmetry
atherosclerosis
cardiovascular risk
asymmetry
vascular system
artificial intelligence
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/23363025.pdf  Link otwiera się w nowym oknie
Opis:
Atherosclerosis remains the main cause of death worldwide. Most important issues concerning atherosclerosis are hemodynamics and how it affects plaque prevalence and distribution, as well as the symmetry and asymmetry of vasculature and plaques. To present the symmetry in the vascular system an analysis of PubMed and MEDLINE databases was performed. As of February 21, 2023, the results were as follows: for “symmetry” AND “atherosclerosis” there were 47 results; for “symmetry” AND “atherosclerotic lesions” – 20 results; for “symmetry” AND “artery stenosis” – 82 results; for “asymmetry” AND “atherosclerosis” – 87 results. Not without meaning are preventive measures. In the light of the Fourth Industrial Revolution artificial intelligence (AI) solutions help to develop new tools outperforming already existing cardiovascular risk scales. The aim of this paper is to present a current view on symmetry within vasculature and atherosclerosis as well as present a new approach to assess individuals’ cardiovascular risk in accordance with precision medicine assumptions. Symmetry and asymmetry within the human vascular system play a crucial role in understanding of arterial diseases, including atherosclerosis. Moreover, it is unavoidable to use AI in cardiovascular risk stratification.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphometric analysis of the lumbar vertebrae and intervertebral discs in relation to abdominal aorta : CT-based study
Autorzy:
Krzyżewski, Roger
Frączek, Maciej J.
Kwinta, Borys
Popiela, Tadeusz
Polak, Jarosław
Grochowska, Anna
Kot, Anna
Klepinowski, Tomasz
Opis:
Purpose: Although lumbar discectomy is the most common procedure in spine surgery, reports about anatomical relations between discs and prevertebral vessels are limited. Aim of this research was to investigate morphometric of the lumbar region and the relations between intervertebral discs (IVDs) and abdominal aorta. Methods: 557 abdominal computed tomography scans were assessed. For each spinal column level from Th12/L1 down to L4/L5, we investigated: intervertebral disc’s and vertebra’s height, width, length, and distance from aorta or common iliac artery (CIA). Those arteries were also measured in two dimensions and classified based on location. Results: 54.58% of patients were male. There was a significant difference in arterial-disc distances (ADDs) between genders at the levels: L1/L2 (1.32 ± 1.97 vs. 0.96 ± 1.78 mm; p = 0.0194), L2/L3 (1.97 ± 2.16 vs. 1.15 ± 2.01 mm; p < 0.0001), L3/L4 (2.54 ± 2.78 vs. 1.71 ± 2.61 mm; p = 0.0012), also for both CIAs (left CIA 3.64 ± 3.63 vs. 2.6 ± 3.06 mm; p = 0.0004 and right CIA: 7.96 ± 5.06 vs. 5.8 ± 4.57 mm; p < 0.001)—those ADDs were higher in men at all levels. The length and width of IVD increased alongside with disc level with the maximum at L4/L5. Conclusion: Bifurcations of the aorta in most cases occurred at the L4 level. Collected data suggest that at the highest lumbar levels, there is a greater possibility to cause injury of the aorta due to its close anatomical relationship with discs. Females have limited, in comparison to males, ADD at L1/L2, L2/L3, and L3/L4 levels what should be taken into consideration during preoperative planning of surgical intervention.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Signals flowing from mature tissues to shoot apical meristem affect phyllotaxis in coniferous shoot
Autorzy:
Banasiak, A
Zagorska-Marek, B.
Tematy:
mature tissue
shoot
apical meristem
phyllotaxis
coniferous plant
auxin
vascular system
leaf
primordium
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Wydawca:
Polskie Towarzystwo Botaniczne
Powiązania:
https://bibliotekanauki.pl/articles/57096.pdf  Link otwiera się w nowym oknie
Opis:
Axial homodromy in growing shoots of perennial plants with spiral phyllotaxis is the case when the chirality of phyllotactic pattern does not change in consecutive growth increments of the same axis. In conifers such as Picea or Abies this rule is strictly observed, except for the rare cases of discontinuous phyllotactic transitions. In Torreya, however, the chirality changes, at random, every year. The pattern of primordia packing, executed by vegetative shoot apical meristem (SAM), depends in Torreya on their identity. The primordia of bud scales are initiated in the decussate and those of needles in bijugate spiral pattern. The decussate, achiral i.e. neutral pattern always precedes the formation of new spiral pattern and thus facilitates random selection of its chiral configuration. Periodic change in organ identity cannot itself be responsible for the special behavior of Torreya, because in other conifers it also exists. There is, however, one important difference: in Torreya, when the initiation of bud scales begins at SAM, the distance between differentiated protoxylem and the initiation site gradually increases, while in other conifers it remains constant and small. In Torreya, at this phase of development, the rate of xylem differentiation and the rate of organogenesis become uncoupled. Closer anatomical examination shows that the decussate pattern in a bud scale zone develops slowly suggesting gradual decrease of the putative signal flowing acropetally from differentiated protoxylem, responsible for positioning of primordia. We hypothesize that in the absence of this signal SAM starts acting autonomously, distributing primordia according to their identity only. A constant presence of the signal in other conifers assures the continuation of the same phyllotactic pattern throughout the period of bud scale formation, despite the change in organ identity.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vascular structure of the earliest shark teeth
Autorzy:
Martínez-Pérez, C.
Martín-Lazaro, A.
Ferrón, H. G.
Kirstein, M.
Donoghue, P. C. J.
Botella, H.
Tematy:
Leonodus
Celtiberina
early chondrichthyans
Lower Devonian
synchrotron tomography
vascular system
ryby chrzęstnoszkieletowe
ryby chrzęstne
chrzęstniki
dolny dewon
tomografia
układ naczyniowy
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/139170.pdf  Link otwiera się w nowym oknie
Opis:
Here we use synchrotron tomography to characterise dental vasculature in the oldest known tooth-bearing sharks, Leonodus carlsi Mader, 1986 and Celtiberina maderi Wang, 1993. Three dimensional reconstruction of the vascular system and microstructure of both taxa revealed a complex and dense network of canals, including horizontal, ascending and secondary bifurcated canals, as well as histological features consistent with an osteodont histotype. However, L. carlsi and C. maderi also exhibit significant morphological differences, showing Leonodus a typical diplodont tooth morphology with a linguo-labially elongated base, that contrast with Celtiberina’s teeth that show a single conical cusp curved lingually with a week developed flat base mesio-distally extended, perhaps reflecting distant relationship. These data are compatible with a pre-Devonian diversification of the two main tooth types traditionally recognised in Palaeozoic sharks (i.e., “cladodont” vs “diplodont”). Finally, our data demonstrate that existing dental classification schemes based on styles of vascularisation are over-simplified, especially when Palaeozoic taxa are considered.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of care of the patient with psychoorganic syndrome by theory of Dorothy Orem
Model opieki nad pacjentem z zaburzeniami psychoorganicznymi wg teorii Dorothy Orem
Autorzy:
Zajas, Michalina
Opis:
Zaburzenia psychoorganiczne o charakterze naczyniowym mogą mieć charakter łagodnych zaburzeń poznawczych lub otępienia naczyniopochodnego. Etiopatogeneza zaburzeń jest niejednorodna. Występowanie otępienia naczyniowego jest spowodowane destrukcją określonych struktur mózgu wynikającą z uszkodzenia danego naczynia krwionośnego lub niewystarczającego przepływu krwi przez naczynia mózgowe. W wyniku destrukcji danej struktury pojawiają się u pacjenta takie objawy jak pomijanie stronne czy afazja oraz objawy wspólne dla różnych typów otępień, takie jak zaburzenia rytmu dobowego, zaburzenia nastroju czy niesamodzielność w czynnościach dnia codziennego. Celem niniejszej pracy jest przedstawienie roli pielęgniarki w opiece nad pacjentem z zaburzeniami psychoorganicznymi naczyniopochodnymi. Podano definicję zaburzeń psychoorganicznych, przedstawiono etiopatogenezę, epidemiologię, czynniki ryzyka oraz obraz kliniczny otępienia naczyniowego. Praca pielęgniarki w opiece nad chorym z zaburzeniami psychoorganicznymi opiera się w dużej mierze na działaniach niefarmakologicznych, rehabilitacji i wsparciu emocjonalnym. Pielęgniarka powinna posiadać takie cechy jak empatia, cierpliwość, serdeczność, wykazywać duże zaangażowanie w opiece nad chorym oraz prowadzić edukację opiekunów i rodziny pacjenta. Model opieki nad pacjentem przedstawiony w niniejszej pracy oparty jest o teorię Dorothy Orem, w której skład wchodzi teoria samoopieki, teoria deficytu samoopieki oraz teoria systemów pielęgnowania.
Psychoorganic syndrome related to the vascular nature may be caused by mild cognitive impairment and vascular dementia. Etiopathogenesis of these disorders is heterogeneous. The presence of vascular dementia is caused by the destruction of certain brain structures resulting from damage of the blood vessel or insufficient blood flow through blood vessel. As a result of the destruction of the certain structure, symptoms such as hemispatial neglect, aphasia, as well as symptoms common to various types of dementi , such as the circadian rhythm disfunctions, mood swings or no dependence in daily activities can appear in patient’s behaviour. The aim of this thesis is to present the role of nurses in the care of patients with psychoorganic syndrome. In this study the definition of psychooragnic syndrome is mentioned as well as etiopathogenesis, epidemiology, risk factors and clinical studies about vascular dementia. The work of nurses in the care of patients with psychoorganic syndrome is based largely on the non-pharmacological activities such as rehabilitation and emotional support. The nurse should possess qualities such as empathy, patience, kindness, should demonstrate a strong commitment to the patient and educate patient’s caregivers and family. The care model presented in this paper is based on the theory of Dorothea Orem, that includes the theory of self-care, self-care deficit theory and nursing system theory.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Congestive myelopathy due to intradural spinal AVM supplied by artery of Adamkiewicz : case report with brief literature review and analysis of the Foix-Alajouanine syndrome definition
Autorzy:
Mistry, Kewal A.
Garg, Swati
Patel, Ankitkumar
Chadha, Veenal
Sood, Dinesh
Patel, Dhruv G.
Khatri, Garvit D.
Suthar, Pokhraj P.
Opis:
BACKGROUND: Spinal arteriovenous malformations (AVMs) can lead to development of congestive myelopathy (Foix-Alajouanine syndrome). Spinal AVMs are rare and so is this syndrome. Diagnosis is often missed due to its rarity and confusing definitions of the Foix-Alajouanine syndrome. CASE REPORT: We report a case of a 47-year-old male patient suffering from this rare syndrome with an AVM arising from the artery of Adamkiewicz, which is another rarity. Our patient was treated by embolization of the lesion with 20% glue, after which he showed mild improvement of symptoms. We also present a brief review of literature on spinal AVMs and elucidate the evolution of the term Foix-Alajouanine syndrome. CONCLUSIONS: Use of the term "Foix-Alajouanine syndrome" should be restricted to patients with progressive subacute to chronic neurological symptoms due to congestive myelopathy caused by intradural spinal AVMs. CT angiography should supplement DSA as preliminary Imaging modality. Patients may be treated with surgery or endovascular procedures.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 23

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