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Tytuł:
Precision medicine and improving the outcomes of atrial tachycardia ablation: a comprehensive review
Autorzy:
Młyński, Mikołaj
Sławiński, Grzegorz
Kozłowski, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/33894933.pdf
Data publikacji:
2024-06-28
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
atrial tachycardia
catheter ablation
prognostic factors
procedural technique
precision medicine
Opis:
Atrial tachycardia (AT) is a prevalent cardiac arrhythmia characterized by rapid, abnormal electrical activity originating from the atria. It represents a significant clinical challenge due to its potential for recurrence, adverse cardiovascular outcomes, and impact on patients' quality of life. Catheter ablation has emerged as a primary therapeutic modality for AT, offering the potential for rhythm control and symptom alleviation. Despite advancements in ablation techniques and technology, the success of AT ablation can vary widely among patients. Identifying prognostic factors associated with successful ablation and potential outcome improving techniques is imperative for optimizing patient care.
Źródło:
European Journal of Translational and Clinical Medicine; 2024, 7, 1; 5-15
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer modelling of the ablation casting process and prediction of the strength properties of AC-42000 castings
Autorzy:
Małysza, Marcin
Puzio, Sabina
Major-Gabryś, Katarzyna
Głowacki, Mirosław
Wilk-Kołodziejczyk, Dorota
Kamińska, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/29520071.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
casting
simulations
ablation
gravity sand casting
gravity die casting
mechanical properties
Opis:
The demand for castings with superior properties has compelled the development and optimization of manufacturing technologies. By further developing already known techniques, we are able to contribute to the introduction of new research possibilities. The article presents the methodology of conducting simulation tests of the gravity casting process into sand moulds with the use of ablation. The ablation technique consists in spraying water through evenly spaced nozzles onto a mould into which the liquid casting alloy has been poured. The conducted research focuses on an alloy from the group of Al-Si alloys. In order to compare the effects of different techniques, additional tests were carried out for gravity casting into sand and metal die moulds. At the same time, virtual experiments were conducted to develop a simulation methodology for ablation casting technology, taking into account mould degradation. Additionally, the possibility of predicting the final mechanical properties of various manufacturing technologies was tested. Destructive tests were carried out to determine the mechanical properties in the cast samples, as well as microstructure tests and secondary dendrite spacing. The results of the mechanical tests are compared with the predicted simulation properties.
Źródło:
Computer Methods in Materials Science; 2022, 22, 2; 79-88
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Osteoid osteoma mimicking tuberculosis and juvenile idiopathic arthritis – a case report
Kostniak kostnawy w masce gruźlicy i młodzieńczego idiopatycznego zapalenia stawów – opis przypadku
Autorzy:
Wałejko, Szymon
Napora, Justyna
Mazurek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2193813.pdf
Data publikacji:
2022-03-31
Wydawca:
Wydawnictwo Exemplum
Tematy:
osteoid osteoma
bone tumor
tuberculosis
juvenile idiopathic arthritis
computed tomography
radiofrequency ablation
kostniak kostnawy
guz kości
gruźlica
młodzieńcze idiopatyczne zapalenie stawów
tomografia komputerowa
ablacja prądem częstotliwości radiowej
Opis:
Osteoid osteoma is a common benign bone tumor. The classic presentation includes nocturnal pain that responds well to nonsteroidal anti-inflammatory drugs. Osteoid osteoma can mimic many conditions, including juvenile idiopathic arthritis, infection, malignant neoplasm, and post-traumatic condition. We present the case of a 14-year-old girl with a months-long history of pain with limited mobility of the left hip joint. The patient was subject to several incorrect diagnoses followed by incorrect treatment pathways. Initially, a post-traumatic condition was diagnosed, then latent tuberculosis and juvenile idiopathic arthritis. Numerous hospitalizations, laboratory and imaging studies, and inappropriate treatment delayed the diagnosis and appropriate management by 2 years. Ultimately, a CT scan of the hip joints enabled the correct diagnosis to be made. Thermal ablation with intraoperative 3D navigation was utilized to successfully treat the lesion.
Kostniak kostnawy jest częstym łagodnym nowotworem kości. Klasyczna prezentacja objawów obejmuje ból nocny, dobrze reagujący na niesteroidowe leki przeciwzapalne. Kostniak kostnawy może naśladować wiele schorzeń, m.in. młodzieńcze idiopatyczne zapalenie stawów, infekcję, nowotwór złośliwy, stan pourazowy. Przedstawiamy przypadek 14-letniej dziewczynki z wielomiesięczną historią bólu z ograniczeniem ruchomości lewego stawu biodrowego. Pacjentka przeszła kilka nieprawidłowych ścieżek diagnostyczno-leczniczych. Początkowo rozpoznano stan pourazowy, następnie gruźlicę latentną oraz młodzieńcze idiopatyczne zapalenie stawów. Liczne hospitalizacje, badania laboratoryjne, obrazowe oraz niedostosowane leczenie spowodowały opóźnienie rozpoznania i wdrożenie odpowiedniego postępowania o 2 lata. Ostatecznie wykonanie badania TK stawów biodrowych umożliwiło postawienie prawidłowego rozpoznania. Wyleczenie uzyskano za pomocą ablacji termicznej z śródoperacyjną nawigacją 3D.
Źródło:
Chirurgia Narządów Ruchu i Ortopedia Polska; 2022, 87, 1; 32-35
0009-479X
2956-4719
Pojawia się w:
Chirurgia Narządów Ruchu i Ortopedia Polska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periprocedural decrease in tumor necrosis factor alpha is a risk factor for atrial fibrillation recurrence after ablation
Autorzy:
Szczerba, Ewa
Koźluk, Edward
Januszkiewicz, Łukasz
Lisicka, Monika
Nowak, Justyna
Kondracka, Agnieszka
Majstrak, Joanna
Rodkiewicz, Dariusz
Piątkowska, Agnieszka
Kiliszek, Marek
Opolski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/25712809.pdf
Data publikacji:
2022-12-05
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
atrial fibrillation
ablation
TNF-alpha
Opis:
Background Concentration of tumor necrosis factor alpha (TNF-alpha) might be useful in selecting patients with paroxysmal atrial fibrillation (PAF) who will benefit the most from pulmonary vein isolation. Material and methods We performed prospective cohort study among patients with PAF who had sinus rhythm prior to undergoing either radiofrequency ablation or cryoablation procedure. Blood samples were collected at the start of the procedure and 16-24 h after. TNF-alpha concentrations were measured. Follow-up data was obtained during a structured telephone interview and 24-hour ECG Holter monitoring 12 months after the ablation procedure. Results Thirty seven patients were enrolled. After 12-month follow-up 27 patients maintained sinus rhythm, 8 had recurrence of AF and 2 were lost to follow-up. There was no significant correlation between TNF-alpha concentrations in any of the samples and the recurrence of arrhythmia (for pre-procedural samples: 1.75 pg/ml vs 1.74 pg/ml; p=0.72; for post-procedural samples: 1.49 pg/ml vs 1.79 pg/ml; p=0.16). In patients who had a recurrence of AF, we observed a decrease in the periprocedural TNF-alpha concentration (-0.12 pg/ml vs 0.05 pg/ml; p=0.05). Conclusions Neither pre- nor post-procedural TNF-alpha concentrations are predictive of ablation outcome in patients with PAF. We observed a decrease in the periprocedural TNF-alpha concentration in patients who had AF recurrence.
Źródło:
European Journal of Translational and Clinical Medicine; 2022, 5, 2; 16-23
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent advances on diagnosis and treatment of osteoid osteoma
Najnowsze doniesienia w diagnostyce i leczeniu kostniaka kostnawego
Autorzy:
Gryglewski, Krystian
Napora, Justyna
Wałejko, Szymon
Mazurek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2193867.pdf
Data publikacji:
2022-03-31
Wydawca:
Wydawnictwo Exemplum
Tematy:
osteoid osteoma
radiofrequency ablation
CT-guided procedure
thermal ablation
cryoablation
laser ablation
microwave ablation
Magnetic Resonance-guided Focused Ultrasound (MRgFUS)
kostniak kostnawy
ablacja częstotliwością radiową
nawigacja tomografią komputerową
termoablacja
krioablacja
ablacja laserowa
ablacja mikrofalowa
MRgFUS
Opis:
Osteoid osteoma (OO) is a benign bony lesion with a characteristic radiologic feature of x-ray focus (nidus). The most common symptom indicating diagnosis is strong nocturnal pain that eases with nonsteroidal anti-inflammatory drugs (NSAID). Computed tomography (CT) is a method of choice for diagnosing and localizing the tumor. Osteoid osteoma can regress spontaneously, thus conservative treatment is one of the methods of choice. In the past open resection surgery had been a standard management of osteoid osteoma until radiofrequency ablation (RFA) was discovered in the early 1990s. Nowadays, there are a few minimally invasive treatment techniques that are used. CT-guided radiofrequency ablation is considered a gold standard technique these days. Many cases occur with late diagnosis, and delayed treatment despite of characteristic symptoms. Therefore, it is crucial to be familiar with the clinical features of osteoid osteoma, proper diagnostic patterns, and treatment schemes.
Kostniak kostnawy jest nowotworem łagodnym o charakterystycznym ognisku (nidus) w badaniach radiologicznych. Najczęstszym objawem prowadzącym do jego rozpoznania jest silny, nocny ból, reagujący na niesteroidowe leki przeciwzapalne. Tomografia komputerowa jest metodą z wyboru w diagnostyce i lokalizacji zmiany. Kostniak kostnawy może wygoić się samoistnie, toteż leczenie zachowawcze jest jedną z metod postępowania. Resekcja otwarta była standardowym leczeniem kostniaka kostnawego do czasu wprowadzenia termoablacji prądem wysokiej częstotliwości (RFA) na początku lat 90. XX wieku. Obecnie istnieje kilka metod leczenia małoinwazyjnego. RFA pod kontrolą tomografii komputerowej jest aktualnie uważana za złoty standard terapeutyczny leczenia kostniaka kostnawego. W wielu przypadkach występuje znaczne opóźnienie pomiędzy początkiem charakterystycznych objawów a postawieniem prawidłowej diagnozy i skutecznym wyleczeniem. W związku z tym istotna jest znajomość obrazu klinicznego, prawidłowy dobór metod diagnostycznych i leczniczych.
Źródło:
Chirurgia Narządów Ruchu i Ortopedia Polska; 2022, 87, 1; 25-31
0009-479X
2956-4719
Pojawia się w:
Chirurgia Narządów Ruchu i Ortopedia Polska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Phosphate Binder for Ablation Casting of AlSi7Mg Modified TiB Alloy
Autorzy:
Puzio, Sabina
Kamińska, J.
Major-Gabryś, K.
Angrecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/2126893.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ablation casting technology
alumina
phosphate binder
self-hardening sand
inorganic binder
odlewanie ablacyjne
tlenek glinu
spoiwo fosforanowe
piaski samoutwardzalne
spoiwo nieorganiczne
Opis:
The possibilities of using an inorganic phosphate binder for the ablation casting technology are discussed in this paper. This kind of binder was selected for the process due to its inorganic character and water-solubility. Test castings were made in the sand mixture containing this binder. Each time during the pouring liquid alloy into the molds and solidification process of castings, the temperature in the mold was examined. Then the properties of the obtained castings were compared to the properties of the castings solidifying at ambient temperature in similar sand and metal molds. Post-process materials were also examined - quartz matrix and water. It has been demonstrated that ablation casting technology promotes refining of the microstructure, and thus upgrades the mechanical properties of castings (Rm was raised about approx. 20%). Properties of these castings are comparable to the castings poured in metal moulds. However, the post-process water does not meet the requirements of ecology, which significantly reduces the possibility of its cheap disposal.
Źródło:
Archives of Foundry Engineering; 2022, 22, 1; 62--68
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of the spatial and temporal changes on the Jakobshavn Glacier (Greenland) using remote sensing data
Autorzy:
Olszewska, Katarzyna
Borowiec, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/2055846.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
global warming
glaciers
ablation
glacier calving
remote sensing
Greenland
Opis:
This article presents the problem of climate warming and the effect of melting ice caps. The problem of climate warming is discussed in two stages. In the first stage, the factors affecting global warming are discussed in detail and the effects and risks of ablation extensively described. Analyses were conducted on data available online from NASA and Carbon Dioxide Information Analysis Center. The Greenland area (Jakobshavn Glacier) was selected to visualize glacier calving front changes. The analysis of changes was performed on the selected satellite images covering the summer period (June to September) provided by the Landsat program. Then, the changes in the position of the calving front of the Jakobshavn Glacier were visualized for the period 1985–2020, with a repeatability of every 5 years. Thus, our results addressed the challenges of environmental changes to remote sensing data processing. In addition to the visualization, a surface summary of these changes was presented in the study. The results were discussed in the context of climate change data processed by means of the GIS method. Furthermore, an analysis of the effects of greenhouse gases on glacier surface changes was performed. In summary, the results reveal that satellite imagery is an excellent source of data on which to visualize glacier calving rates, comparing individual layers showing the position of the glacier calving front and calculating the area of calved ice.
Źródło:
Geology, Geophysics and Environment; 2021, 47, 4; 187--201
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference in demand for analgesic and sedative medication according to the type of catheter ablation for atrial fibrillation
Autorzy:
Koźluk, Edward
Rzechorzek, Wojciech
Piątkowska, Agnieszka
Rodkiewicz, Dariusz
Opolski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1197576.pdf
Data publikacji:
2021-05-26
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
analgesia
atrial fibrillation
catheter ablation
conscious sedation
cryoballoon
Opis:
Background: Our aim was to determine if there is a difference in demand for analgesic and sedative medication according to the type of catheter ablation for atrial fibrillation (AF). Material and methods: We collected data from protocols of 1144pts, who underwent ablation of AF. We excluded 275pts, at most due to electrocardioversion during the procedure. We divided them into 4 groups: cryoballoon ablation group (CB, n = 101), single-point radiofrequency ablation group (RFth-, n = 541), single-point radiofrequency ablation group with thermocool catheter (RFth+, n = 156) and Multielectrode Pulmonary Vein Ablation Catheter group (PVAC, n = 71). We used fentanyl and midazolam for pain control. The dose was adjusted by the operator, accord-ing to patients’ request. Results: The median dose of fentanyl 0.04 mg (0.00-0.08) and midazolam 1.00 mg (0.00-2.00) in CB group was lower than in other groups (p < 0.001). The median dose of fentanyl 0.12 mg (0.08-0.17) was lower in RFth- than in in RFth+ group: 0.15 mg (0.1-0.2) (p < 0.001). The demand for analgesia was higher when PVAC was used, with median dose of fentanyl 0.15 mg (0.1-0.2) (p < 0.0024). Conclusions: The demand for analgesic/sedative medication was lower among patients who underwent CB. Among those who underwent RF ablation it was higher in groups with thermocool and multielectrode catheters.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 1; 35-42
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Assessment of the Impact of Sonication Parameters on Necrotic Lesions Induced in Tissues by HIFU Ablative Device for Preclinical Studies
Autorzy:
Fura, Łukasz
Dera, Wojciech
Dziekoński, Cezary
Świątkiewicz, Maciej
Kujawska, Tamara
Powiązania:
https://bibliotekanauki.pl/articles/1953466.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
automated ultrasound imaging-guided HIFU ablation system
ex vivo tissue
ultrasonic exposure parameters
extent of necrotic lesions
Opis:
We have designed and built ultrasound imaging-guided HIFU ablative device for preclinical studies on small animals. Before this device is used to treat animals, ex vivo tissue studies were necessary to determine the location and extent of necrotic lesions created inside tissue samples by HIFU beams depending on their acoustic properties. This will allow to plan the beam movement trajectory and the distance and time intervals between exposures leading to necrosis covering the entire treated volume without damaging the surrounding tissues. This is crucial for therapy safety. The objective of this study was to assess the impact of sonication parameters on the size of necrotic lesions formed by HIFU beams generated by 64-mm bowl-shaped transducer used, operating at 1.08 MHz or 3.21 MHz. Multiple necrotic lesions were created in pork loin samples at 12.6-mm depth below tissue surface during 3-s exposure to HIFU beams with fixed duty-cycle and varied pulse-duration or fixed pulse-duration and varied duty-cycle, propagated in two-layer media: water-tissue. After exposures, the necrotic lesions were visualized using magnetic resonance imaging and optical imaging (photos) after sectioning the samples. Quantitative analysis of the obtained results allowed to select the optimal sonication and beam movement parameters to suport planning of effective therapy.
Źródło:
Archives of Acoustics; 2021, 46, 2; 341-352
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-power and short-duration ablation with the Qdot+ algorithm for pulmonary vein isolation and the right superior ganglion plexus ablation without fluoroscopy
Autorzy:
Koźluk, Edward
Piątkowska, Agnieszka
Rodkiewicz, Dariusz
Opolski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1891023.pdf
Data publikacji:
2021-12-02
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
atrial fibrillation
pulmonary vein isolation
high power short duration ablation
Qdot Micro catheter
ganglion plexi ablation
zero-fluoroscopy ablation
Opis:
In this report we present pulmonary vein and posterior box isolation together with the right superior ganglion plexus ablation using the Qdot Micro catheter without fluoroscopy. We describe different possibilities of this new technology for catheter ablation. The main advantages of this catheter to potentially increase ablation safety and effectiveness are discussed. Specifically, the possibility to perform high-density mapping with the lowest available distance between points. Furthermore, the possibility to decrease the risk of collateral tissue damage and to improve atrial linear lesions contiguity, transmurality and durability due to the dominance of resistive heating supported by the feedback temperature control. Finally, the possibility to shorten the procedure and fluoroscopy duration due to the high shortening of application duration to 4 seconds only.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 2; 10-17
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Irrigated DiamondTemp catheter and return to ablation under temperature control. First Polish experience with DiamondTemp catheter in pulmonary vein isolation
Autorzy:
Koźluk, Edward
Piątkowska, Agnieszka
Rodkiewicz, Dariusz
Opolski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1890952.pdf
Data publikacji:
2021-12-02
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
atrial fibrillation
zero fluoroscopy
pulmonary vein isolation
high-power short-duration ablation
temperature control RF ablation
Opis:
We present the first Polish experience with ablation performed using DiamondTemp catheter. The study was conducted with 3 male patients diagnosed with atrial fibrillation (AF). In the first 2 patients typical transseptal punctures were performed, followed by mapping with the Advisor catheter and EnSite-Precision system. One patient had a residual atrial septal leak, therefore ablation without fluoroscopy was attempted. High-power, short-duration ablation under temperature control was performed around pulmonary vein (PV) ostia. The power was 49-53 W, the temperature was 45-48 ͦC. Duration of procedures/fluoroscopy were: 146/8.9, 177/5.9, 132/0.0 min. In the reference group, 10 recent AF identical ablation procedures performed with traditional equipment resulted in 143.0±27.0/6.0±4.4 min. Duration of DiamondTemp applications were 14.7, 32.7, 30.8 min (reference group 37.3 ± 11.4 min). Procedural endpoints were achieved in all but one patient with incomplete isolation of the low segment of the right inferior PV. There were no procedural complications noted. In conclusion, the DiamondTemp saline-irrigated catheter is safe and effective for high-power short-duration ablation in patients with AF. Furthermore, this technology makes it possible to complete the procedure without fluoroscopy. However these findings must be confirmed in larger group of patients.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 2; 44-51
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Various Matrixes on the Strength Properties of Moulding Sands with Thermally Hardened Hydrated Sodium Silicate for the Ablation Casting Process
Autorzy:
Major-Gabryś, Katarzyna
Puzio, Sabina
Bryłka, Agata
Kamińska, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/2056023.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
innovative foundry technologies and materials
moulding sand
ablation casting
water glass
thermal curing
innowacyjne technologie
materiały odlewnicze
piasek formierski
odlewanie ablacyjne
szkło wodne
utwardzanie termiczne
Opis:
The essence of ablation casting technology consists in pouring castings into single-use moulds made from the mixture of sand and a water-soluble binder. After pouring the mould with liquid metal yet while the casting is still solidifying, the mould destruction (washing out, erosion) takes place using a stream of cooling medium, which in this case is water. This paper focuses on the selection of moulding sands with hydrated sodium silicate for moulds used in ablation casting. The research is based on the use of water glass 145 and 150 as binders. As part of the research, loose moulding mixtures based on two silica sands from different sand mines with different content of binders were prepared. The review of literature data and the results of own studies have shown that moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties to be used in the ablation casting process. Our own research also confirmed the possibility of using these sand mixtures in terms of both casting surface quality and sand reclamation. The results presented in this paper prove that both sand grains and types of binder tested may be used as components in moulding sands devoted to ablation casting.
Źródło:
Journal of Casting & Materials Engineering; 2021, 5, 2; 31--35
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the Type of Inorganic Binder on the Properties of Microwave-Hardened Moulding Sands for Ablation Casting Technology
Autorzy:
Puzio, S.
Kamińska, J.
Angrecki, M.
Major-Gabryś, K.
Powiązania:
https://bibliotekanauki.pl/articles/353306.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative technologies
ablation casting
moulding sands
microwave hardening
environmentally friendly inorganic binders
Opis:
The aim of this study is to demonstrate the possibility of using moulding sands based on inorganic binders hardened in a microwave chamber in the technology of ablation casting of aluminium alloys. The essence of the ablation casting technology consists in this that a mould with a water-soluble binder is continuously washed with water immediately after being poured with liquid alloy until its complete erosion takes place. The application of an environmentally friendly inorganic binder improves the ecology of the whole process, while microwave hardening of moulding sands allows moulds to be made from the sand mixture containing only a small amount of binder. The studies described in this article included microwave-hardened sand mixtures containing the addition of selected inorganic binders available on the market. The strength of the sands with selected binders added in an amount of 1.0; 1.5 and 2.0 parts by mass was tested. As a next step, the sand mixtures with the strength optimal for ablation casting technology, i.e. about 1.5 MPa, were selected and tested for the gas forming tendency. In the four selected sand mixtures, changes occurring in the samples during heating were traced. Tests also included mould response to the destructive effect of ablation medium, which consisted in the measurement of time necessary for moulds to disintegrate while washed with water. Tests have shown the possibility of using environmentally friendly, microwave-hardened moulding sands in ablation casting of aluminium alloys.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1385-1390
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First experience with left atrial arrhythmia ablation using a bidirectional steerable transseptal sheath (Vizigo) visible in the CARTO system as a method to reduce fluoroscopy
Autorzy:
Koźluk, Edward
Łojewska, Katarzyna
Hiczkiewicz, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/1196137.pdf
Data publikacji:
2020-12-03
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
atrial fibrillation ablation
pulmonary vein isolation
zero fluoroscopy
steerable sheath
electroanatomic mapping system
Opis:
In this report we present ablations of complex left atrial arrhythmias in 3 male patients using the bi-directional steerable transseptal sheath (Visigo) which is visualizable by the 3D electro-anatomical system. Ablations of complex left atrial (LA) arrhythmias were performed in 3 patients. In the first 2 patients typical transseptal punctures were performed, followed by mapping with the LassoNav catheter and PVI (one patient also had isolation of the posterior segment). The last patient had a residual atrial septal leak, therefore ablation without fluoroscopy was attempted. An anatomical map of the right atrium was made. The ablation catheter and the Vizigo sheath were introduced into the LA through the leak in the septum. LA, pulmonary veins and 3 tachycardia loops were mapped. Lines were made in the roof of LA, in the mitral isthmus and within the atrial septum, restoring the sinus rhythm. Times of procedures/fluoroscopy were: 185, 185, 205min / 5.5; 3.8 and 0min. In the group of the last 10 previous ablations, these times were respectively: 209±48min/5,6±1,8 min. We conclude that the Vizigo sheath reduces the risk of electrode and sheath dislocation into the right atrium and the need for fluoroscopic verification during maneuvers performed with the sheath. It is also a step towards simpler left atrial ablation without the use of fluoroscopy.
Źródło:
European Journal of Translational and Clinical Medicine; 2020, 3, 2; 18-21
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser modified functional carbon-based coatings on titanium substrate for cardiac tissue integration and blood clotting inhibition
Autorzy:
Major, Roman
Ostrowski, Roman
Surmiak, Marcin
Trembecka-Wójciga, Klaudia
Lackner, Jurgen
Powiązania:
https://bibliotekanauki.pl/articles/1844973.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
thin layers
migration channels
laser ablation
microstructure
Opis:
The work focused on developing functional coatings on titanium substrates that would facilitate the integration with the cardiac tissue and with a specific form of connective tissue like blood. Surface modifications consisted in the laser evaporation of part of the biocompatible layer, thus creating a suitable environment for a particular tissue. For the myocardium integration, the metal surface was refined by biohemocompatible coatings. Such surfaces were the starting point for further modifications in the form of channels. The channeled surfaces enabled a controlled cell migration and proliferation. The interaction of endothelial cells with the material was highly dependent on the surface characteristics such as: topography, microstructure or mechanical properties. The controlled cellular response was achieved by modifying the surface to obtain a network of wells or channels of different dimensions via the laser interference lithography. This technique determined a high resolution shape, size and distribution patterns. As a result, it was possible to control cells in the scale corresponding to biological processes. The surface periodization ensured the optimal flow of oxygen and nutrients within the biomaterial, which was of a key importance for the cell adhesion and proliferation. The work attempted at producing the surface networks mimicking natural blood vessels. To stimulate the formation of new blood vessel the finishing resorbable synthetic coatings were applied on the surface to act as a drug carrier. Therefore, the initial trial to introduce factors stimulating the blood vessels growth was performed.
Źródło:
Engineering of Biomaterials; 2020, 23, 155; 22-31
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 91

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