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Wyświetlanie 1-10 z 530
Tytuł:
Subdirectly irreducible non-idempotent left symmetric left distributive groupoids
Autorzy:
Jeřábek, Emil
Kepka, Tomáš
Stanovský, David
Tematy:
groupoid
left distributive
left symmetric
subdirectly irreducible
Pokaż więcej
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:
https://bibliotekanauki.pl/articles/729183.pdf  Link otwiera się w nowym oknie
Opis:
We study groupoids satisfying the identities x·xy = y and x·yz = xy·xz. Particularly, we focus our attention at subdirectlyirreducible ones, find a description and charecterize small ones.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applicability of computed tomography preoperative assessment of the LAA in LV summit ablations
Autorzy:
Jakob, Nicholas
Karkowski, Grzegorz
Walocha, Jerzy
Krupiński, Maciej
Gosnell, Marc
Lelakowski, Jacek
Budnicka, Kinga
Kuniewicz, Marcin
Urbańczyk-Zawadzka, Małgorzata
Opis:
Purpose: Ventricular arrhythmias originating from the left ventricular summit (LVS) may present with challenges for catheter ablation. Recently, the left atrial appendage (LAA) became a new vantage point for mapping and ablating arrhythmias from that region, but data of possible usefulness is limited. Methods: From September to December 2019, we retrospectively analyzed 48 consecutive patient hearts (20 male; mean age 57.9y ± 11.56) undergoing diagnostic coronary vessel imaging in 64 dual-source computer tomography angiography (CTA). Distances from the LAA to the LVS, LAA shape type, and coronary arteries in the LVS region were measured. Also, we compared the true LVS area from CTA with a calculated formula derived from LVS definition. Results: The mean LVS area calculated from the formula was 291.58 mm2 (± 115.5) while the true area calculated from CT was 263.33 mm2 (± 99.49) (p = 0.44). The mean inaccessible area was 133.42 mm2 (± 72.89), accessible 95.67 mm2 (± 72.77). The mean LAA coverage over LVS was 196.08 mm2—which is approximately 75% of LVS size in general. The most common LAA shape was chicken wing (50%); windsock has the highest accessible area coverage on average (80.23%), followed by chicken wing (59.88%), broccoli (47.72%), and cactus (46.98%). The mean distance from LAA to the surface was 5.14 mm (1.5 to 10 mm) and was not correlated with BMI. LAA has a 98% coverage over the point of transition between the great cardiac vein and anterior interventricular vein. Conclusion: Angio-CT assessment of the LAA over the LVS structures may be helpful in decision making before an ablation procedure. LAA appears to be a promising mapping approach in LVS arrhythmias.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Autorzy:
Jasińska, Katarzyna
Dudkiewicz, Damian
Dobrzynski, Halina
Hołda, Mateusz
Słodowska, Katarzyna
Opis:
Background: The clinical anatomy of the left atrium is of special interest since many invasive procedures are performed within this chamber. Pulmonary vein isolation, linear transcatheter ablations, transcatheter mitral valve repair procedures and left atrial appendage occlusions are examples of highly effective procedures done within the left atrial chamber. Methods: This narrative literature review seeks to discuss the latest articles about the anatomy of left atrial structures. Results: This article reviews recent morphological studies about the pulmonary venous ostia, the myocardial sleeves of the pulmonary veins, the mitral isthmus, the left atrial appendage isthmus, the left atrial medial isthmus and the other left atrial isthmuses together with spatial relationships of blood vessels within the isthmus lines. This review touch upon the clinical relevance of the left lateral ridge and the left atrial appendage. Conclusion: A thorough understanding of local anatomy is essential for safe electrophysiologic invasive procedures. Clinical anatomy of the left atrium is treacherous, difficult and its unfamiliarity can cause serious intraoperative complications. Some anatomical features of the left atrium may significantly impede invasive transcatheter interventions, especially ablation procedures.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Postoperative coagulation changes in patients after epicardial left atrial appendage occlusion varies based on the left atrial appendage size
Autorzy:
Kapelak, Bogusław
Rusinek, Jakub
Natorska, Joanna
Litwinowicz, Radosław
Lee, Randall J.
Ząbczyk, Michał
Lakkireddy, Dhanunjaya R.
Słomka, Artur
Batko, Jakub
Bartuś, Magdalena
Burysz, Marian
Bartuś, Krzysztof
Opis:
Left atrial appendage occlusion affects systemic coagulation parameters, leading to additional patient-related benefits. The aim of this study was to investigate the differences in coagulation factor changes 6 months after epicardial left atrial appendage occlusion in patients with different LAA morphometries. This is the first study to analyze these relationships in detail. A prospective study of 22 consecutive patients was performed. Plasminogen, fibrinogen, tPA concentration, PAI-1, TAFI and computed tomography angiograms were performed. Patients were divided into subgroups based on left atrial appendage body and orifice diameter enlargement. The results of blood tests at baseline and six-month follow-up were compared. In a population with normal LAA body size and normal orifice diameter size, a significant decrease in analyzed clotting factors was observed between baseline and follow-up for all parameters except plasminogen. A significant decrease between baseline and follow-up was observed with enlarged LAA body size in all parameters except TAFI, in which it was insignificant and plasminogen, in which a significant increase was observed. Occlusion of the left atrial appendage is beneficial for systemic coagulation. Patients with a small LAA may benefit more from LAA closure in terms of stabilizing their coagulation factors associated with potential thromboembolic events in the future.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
On k-radicals of Greens relations in semirings with a semilattice additive reduct
Autorzy:
Mondal, Tapas
Bhuniya, Anjan
Tematy:
k-radicals of Green's relations
left k-regular semiring
left k-simple semiring
distributive lattices of left k-simple semirings
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Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:
https://bibliotekanauki.pl/articles/728930.pdf  Link otwiera się w nowym oknie
Opis:
We introduce the k-radicals of Green's relations in semirings with a semilattice additive reduct, introduce the notion of left k-regular (right k-regular) semirings and characterize these semirings by k-radicals of Green's relations. We also characterize the semirings which are distributive lattices of left k-simple subsemirings by k-radicals of Green's relations.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-term effect of anticoagulation following left atrial appendage occlusion with the LARIAT device in patients with nonvalvular atrial fibrillation : impact on thromboembolism, bleeding and mortality : real life data
Autorzy:
Sobczyk, Dorota
Filip, Grzegorz
Kapelak, Bogusław
Vuddanda, Venkat
Litwinowicz, Radosław
Lakkireddy, Dhanunjaya
Bartuś, Magdalena
Bartuś, Krzysztof
Opis:
Introduction: Indications for left atrial appendage occlusion (LAAO) are varied and patients require individual management strategies. However, currently no guidelines exist for postprocedure oral anticoagulation (OAC) after an LAAO procedure. Aim: To evaluate the effect of OAC on thromboembolism, bleeding and mortality following the LAAO procedure for patients with AF. Material and methods: One hundred and thirty-nine consecutive patients with nonvalvular atrial fibrillation (NVAF) who underwent LAAO with the LARIAT device were followed for at least 40 months. Decisions about OAC and its modifications were individualized based on clinical presentation, patient and physician preferences. Results: Following LAAO, 52 (41%) patients did not receive OAC (No-OAC group) and 75 (59%) patients received OAC (OAC group), without any intergroup differences in CHADS2, CHA2DS2-VASc score or other thromboembolic risk factors. The median HAS-BLED score was higher in the OAC-group (median 3 (3–4) vs. 3 (2–4), p = 0.014). During a median follow-up time of 51 (43–57) vs. 55 (48–59) months in the No-OAC group and in the OAC group (p = 0.19) there were no significant differences between groups in ischemic stroke/TIA, 0 (0%) vs. 2 (2.7%), other thromboembolic events, 0 (0%) vs. 1 (1.3%), life-threatening, disabling or major events, 2 (3.7%) vs. 2 (2.7%), or annual mortality rate, 1.9% vs. 0.9%, respectively. Conclusions: There is no need for OAC after the LAAO procedure. Omitting OAC after an LAAO procedure in AF patients: (1) has similar stroke prevention rates as patients on OAC, (2) has similar bleeding prevention rates as patients on OAC, (3) has similar safety endpoints and long-term efficacy as patients on OAC.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Model of the distribution of diastolic left ventricular posterior wall thickness in healthy adults and its impact on the behavior of a string of virtual cardiomyocytes
Autorzy:
Fijorek, Kamil
Krzesinski, Pawel
Polak, Sebastian
Kocowska, Maryla
Smurzynski, Pawel
Kawecka-Jaszcz, Kalina
Stahli, Barbaar E.
Gielerak, Grzegorz
Stolarz-Skrzypek, Katarzyna
Stanula, Barbara
Kopeć, Grzegorz
Tanner, Felix C.
Tylutki, Zofia
Stanczyk, Adam
Podolec, Mateusz
Uzieblo-Zyczkowska, Beata
Jastrzębski, Marek
Opis:
Correlation of the thickness of the left ventricular posterior wall (LVPWd) with various parameters, including age, gender, weight and height, was investigated in this study using regression models. Multicenter derived database comprised over 4,000 healthy individuals. The developed models were further utilized in the in vitro-in vivo (IVIV) translation of the drug cardiac safety data with use of the mathematical model of human cardiomyocytes operating at the virtual healthy population level. LVPWd was assumed to be equivalent to the length of one-dimensional string of virtual cardiomyocyte cells which was presented, as other physiological factors, to be a parameter influencing the simulated pseudo-ECG (pseudoelectrocardiogram), QTcF and $\Delta$QTcF, both native and modified by exemplar drug (disopyramide) after $I_{Kr}$ current disruption. Simulation results support positive correlation between the LVPWd and QTcF/$\Delta$QTc. Developed models allow more detailed description of the virtual population and thus inter-individual variability influence on the drug cardiac safety
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 530

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