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    Wyświetlanie 1-12 z 12
    Tytuł:
    Review of a Modern Technical Solution in Continuous Miner Machine Technology
    Autorzy:
    Mężyk, Arkadiusz
    Pawlak, Mariusz
    Kania, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/2064276.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    continuous miner
    road header machine
    permanent magnet motor
    silnik z magnesami trwałymi
    maszyna górnicza
    maszyna urabiająca
    Opis:
    In this paper is presented the overview of Continuous Miners available on the market. Numbers describe machines from 1 to 41 and parameters obtained from manufacturers catalogues are presented on diagrams. The statistical analysis of some of parameters are carried out by linear approximation to show factors determining, for example, the total power of installed engines to the power of the cutting head drive, the total power of installed engines to the total mass, cutting height to the cutter diameter and cutting height to the cutting width, etc. Thin layers of coal less than 1.2 m thick and remnants of seams that require work on a system of boards and columns constitute an increasing share of coal deposits. Geometric restrictions, in this case, are closely correlated with the construction form of the machine and they must have high performance with limited geometric dimensions. This type is called “Continuous Miner”, and is closely correlated with those restrictions. The paper reviews the technical solutions used in these machines, which are currently used around the world. Particular attention is paid to the new concept of the cutting drum drive system, in which permanent magnet motors are proposed. Placing them in a cutting drum improves the efficiency of the mining process and the possibility of modular configuration depending on the required working conditions.
    Źródło:
    New Trends in Production Engineering; 2020, 3, 1; 272--282
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault diagnosis of sensors in the control system of a steam turbine
    Diagnostyka uszkodzeń torów pomiarowych w układzie sterowania turbiny parowej
    Autorzy:
    Pawlak, Mariusz
    Buchta, Janusz
    Oziemski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/106069.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
    Tematy:
    diagnostic
    turbine
    control system
    neural networks
    diagnostyka
    turbina
    system sterowania
    sieci neuronowe
    Opis:
    A diagnostic and control system for a turbine is presented. The influence of the turbine controller on regulation processes in the power system is described. Measured quantities have been characterized and methods for detecting errors have been determined. The paper presents the application of fuzzy neural networks (fuzzy-NNs) for diagnosing sensor faults in the control systems of a steam turbine. The structure of the fuzzy-NN model and the model’s method of learning, based on measurement data, are presented. Fuzzy-NNs are used to detect faults procedures. The fuzzy-NN models are created and verified.
    Przedstawiono system diagnostyki dla układu sterowania turbiny parowej. Opisano procesy regulacji w systemie elektroenergetycznym oraz strukturę układu regulacji turbiny kondensacyjnej w układzie bloku energetycznego. Mierzone wielkości zostały scharakteryzowane wraz z metodami wykrywania uszkodzeń dla poszczególnych wielkości. W pracy przedstawiono zastosowanie rozmytych sieci neuronowych do detekcji uszkodzeń torów pomiarowych Przedstawiono strukturę modelu rozmytego i metodę uczenia modelu na podstawie danych pomiarowych. Zaprezentowano przykład zastosowania modelu FNN i zweryfikowano jego działanie na podstawie rzeczywistych danych pomiarowych.
    Źródło:
    Journal of Automation, Electronics and Electrical Engineering; 2019, 1, 1; 29-36
    2658-2058
    2719-2954
    Pojawia się w:
    Journal of Automation, Electronics and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Antibiotic Therapy in Rectal Cancer Surgery
    Autorzy:
    Morawiec, Zbigniew
    Pawlak, Mariusz
    Kołacińska, Agnieszka
    Dziki, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1397022.pdf
    Data publikacji:
    2012-12-01
    Wydawca:
    Index Copernicus International
    Tematy:
    rectal cancer
    infectious complications
    local antibiotic use
    Opis:
    Infectious complications and their consequences are still key issues in rectal cancer surgery. Currently, intravenous antibiotic administration is a recognized method for lowering the rate of these complications. The aim of the study was to assess the efficacy of complementary application of a gentamicin-impregnated sponge in the perineal wound or in the vicinity of intestinal anastomosis after abdominoperineal resection or low anterior resection. Material and methods. 112 patients with primary rectal cancer were enrolled in this study. 42 patients were treated with a gentamicin sponge and drainage (group A) and 70 individuals were treated with drainage alone (group B). In the aforementioned groups a routine short-term regimen of antibiotic prophylaxis was used. We applied gentamicin-impregnated sponges in 27 patients in whom anterior resection was performed and in 15 patients from the abdominoperineal resection group (64% and 36%, respectively). In the control group, 44 anterior resections and 26 abdominoperineal resections were carried out (63% and 37%, respectively). Results. We did not observe statistically significant differences in the incidence of suppurative complications (intraabdominal abscess, perineal wound infection): 4 cases (9.52%) in group A and 9 (12.58%) in group B and anastomotic leakage with clinical manifestation after low anterior resection: 1 case (3.7%) in group A and 2 (4.5%) in group B. Postoperative fever of unknown origin was noted more often in group B: 23 patients (32.8%) versus 10 patients (23.8%) in group A and this difference was statistically significant (p<0.05). Hospitalization after surgery was also significantly longer in group B (9-37 days, median 11 days) as compared with group A (8-26 days, median 13 days) (p<0.05). Conclusions. Local antibiotic therapy in rectal cancer surgery lowered the incidence of postoperative fever of unknown origin and permitted shorter hospitalization after surgery. Local gentamicin application in rectal cancer surgery did not change significantly the rate of infectious complications.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 12; 613-617
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Does the Choice of Hospital Increase a Chance of Survival in Rectal Cancer?
    Autorzy:
    Pawlak, Mariusz
    Morawiec, Zbigniew
    Dziki, Łukasz
    Morawiec, Jan
    Kolacińska, Agnieszka
    Dziki, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1397012.pdf
    Data publikacji:
    2012-12-01
    Wydawca:
    Index Copernicus International
    Tematy:
    rectal cancer
    prognostic factors
    hospital caseload
    5-year survival
    local recurrence
    Opis:
    was to assess the impact of hospital caseload on long-term outcomes of rectal cancer patients. We posed two questions: 1. Does the number of operations carried out in the surgical department influence five year survival and local recurrence rates? 2. Does surgery alone without adjuvant therapy performed in the particular department affect long-term results? Material and methods. 215 consecutive rectal cancer patients treated in six hospitals of the Łódź district between 1994 and 1998 were enrolled into this prospective study. We analyzed patients in whom local excision, low anterior resection, abdominoperineal resection and Hartmann’s procedure were performed. 27 percent of patients received adjuvant therapy such as radio- or chemotherapy or both. Long-term results were compared between high and low volume institutions by means of local recurrence and five year survival rates. Results. In high volume departments; 69.2% of five year survival rates were obtained versus 46.6% for low volume institutions (p=0.00433). Similar differences were noted comparing local recurrence rates between the aforementioned groups: 19.7% versus 36.5%, respectively (p=0.00430). In surgically treated patients who did not receive adjuvant therapy statistically significant differences were found: 76.5% of patients operated on in high volume hospitals survived five years as compared with 42.9% for low caseload institutions (p=0.00013). Local recurrence rates were 15.5% for high caseload institutions and 38.5% for low caseload hospitals (p=0.00042). Conclusions. High volume hospitals achieved better results in rectal cancer patients with regard to five year survival and local recurrence rates. Better outcomes were also obtained in high caseload departments regarding surgically treated patients who did not receive adjuvant therapy.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 12; 638-645
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determinants for international competitiveness of the food industry in 43 countries world-wide: evidence from panel models
    Autorzy:
    Hamulczuk, Mariusz
    Pawlak, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/22443152.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    international competitiveness
    trade balance
    food industry
    panel models
    Opis:
    Research background: Food industry is of key importance to each economy due to its role in ensuring food security, balancing the labour market, as well as contributing to the economic growth and international trade. With a limited increase in demand for food in many highly developed countries, further growth in this sector of the economy will largely depend on the ability to successfully distribute manufactured goods in international markets and cope with competitive pressure from other entities. Purpose of the article: Therefore, the study attempts to assess the determinants of international competitiveness of the food industry worldwide measured by the trade balance. Methods: The research was based on data from the United Nations Conference on Trade and Development Data Center (UNCTADStat) and the World Input-Output Database (WIOD). The time frame for the analyses was determined by the availability of internationally comparable data and thus covered the period of 2000?2014. The empirical analysis was performed with the use of panel models, while international competitiveness was measured by trade balance (net export). Findings & value added: It was proved that increasing trade openness and relative demand, as well as decreasing relative unit labour costs have a positive impact on international competitiveness of the food industry worldwide. However, the nature of the relationship between relative labour productivity and trade balance appears to be ambiguous. A stronger impact of the examined factors on net exports in the long-run rather than the short-run was also evidenced. The novelty of our analysis is that we consider trade balance determinants of the food industry worldwide using panel models, whereas most of the existing studies focus either on one or a narrow group of countries.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2022, 17, 3; 635-667
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Another look at boredom in language instruction: The role of the predictable and the unexpected
    Autorzy:
    Kruk, Mariusz
    Pawlak, Mirosław
    Zawodniak, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1047077.pdf
    Data publikacji:
    2021-03-29
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    boredom
    English as a foreign language
    L2 instruction
    micro-perspective
    negative emotions
    Opis:
    Although recent years have seen a growing interest in positive emotions in second or foreign language learning and teaching, negative emotions are always present in the classroom and they deserve to be investigated in their own right. The article focuses on boredom, a construct that has been explored in educational psychology but has received only scant attention from second language acquisition researchers. It reports a study which examined the changes in the levels of boredom experienced by 13 English majors in four EFL classes and the factors accounting for such changes. Using data obtained from a few different sources (i.e., boredom grids, narratives, interviews, class evaluations and lesson plans), it was found that although boredom can be attributed to different constellations of factors, it was mainly traced to repetitiveness, monotony and predictability of what transpired during a particular class.
    Źródło:
    Studies in Second Language Learning and Teaching; 2021, 11, 1; 15-40
    2083-5205
    2084-1965
    Pojawia się w:
    Studies in Second Language Learning and Teaching
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Knee joint position sense in physically active patients after ACL reconstruction
    Autorzy:
    Pawlak, Dawid
    Wysota, Aleksandra
    Furmanek, Mariusz
    Ficek, Krzysztof
    Juras, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1054848.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    anterior cruciate ligament
    joint position sense
    knee
    reconstruction
    Opis:
    The term “proprioception” is defined as the conduction of sensory information deriving from proprioceptors that have an impact on conscious sensations, posture and trans-segmental sense. An ACL injury may lead to functional knee joint instability. According to research, this may result in impaired movement sensation and joint position. The purpose of this study was to evaluate the joint position sense (JPS) in patients before arthroscopic ACL reconstruction and 5 months after the surgery. The examinations were conducted in a group of twelve specifically selected male patients. The examination procedure consisted of JPS measurement in both lower limbs (the operated and the healthy one) during active extension in a range of angles: 30, 45, 60°. The level of significance was: p < 0.05. The analysis of variance performed for repeated measurements (ANOVA) did not indicate any statistically significant differences of JPS in comparisons made between the operated and the healthy limb. Statistical values for the absolute, relative, and variable errors were p = 0.7684, p = 0.1546, p = 0.5694 respectively. The obtained results do not indicate any limitation of proprioception in patients with ACL injury before the intervention or half a year later.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2014, 7, 3; 65-72
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential sources of foreign language learning boredom: A Q methodology study
    Autorzy:
    Kruk, Mariusz
    Pawlak, Mirosław
    Elahi Shirvan, Majid
    Taherian, Tahereh
    Yazdanmehr, Elham
    Powiązania:
    https://bibliotekanauki.pl/articles/2051509.pdf
    Data publikacji:
    2022-03-21
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    foreign language learning boredom (FLLB)
    Q methodology
    teacher-induced boredom
    student-induced boredom
    activity-induced boredom
    Opis:
    The present study employed an interpretive approach to investigate individual learners’ viewpoints on foreign language learning boredom (FLLB). To this aim, a Q method, which shares features of both qualitative and quantitative research approaches, was used to explore 37 Iranian English as a foreign language (EFL) learners’ perceptions of potential sources of boredom in the classroom. Nonprobability purposeful sampling was used to select participants from two private language institutes in Mashhad, Iran. A hybrid-type Q sampling was employed to produce 40 statements related to the sources of FLLB. Using PQ Method, an exclusive statistical package for Q methodology, the Q sorts were intercorrelated and factor-analyzed. Three factors were extracted and rotated using varimax rotation and hand adjustment. Factor arrays and qualitative analyses were utilized to find and interpret three different accounts of FLLB. The three factors showed that the students held three divergent prototypical points of view about the sources of boredom experienced in EFL learning in class: (a) teacher-induced boredom, (b) student-induced boredom, and (c) activity-induced boredom. The findings also showed that different learner prototypes experience FLLB distinctly. Thus teachers should consider using different strategies to prevent or reduce this negative emotion in the context of L2 learning since otherwise this process could be impeded.
    Źródło:
    Studies in Second Language Learning and Teaching; 2022, 12, 1; 37-58
    2083-5205
    2084-1965
    Pojawia się w:
    Studies in Second Language Learning and Teaching
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of 4-aminopyrimidine at the R-AgLAFE/chlorate(VII) interface. Comparison of the adsorption properties of various water activity as well as different surfactants
    Autorzy:
    Martyna, Marlena
    Pawlak, Alicja
    Grochowski, Mariusz
    Bazan-Woźniak, Aleksandra
    Pietrzak, Robert
    Nosal-Wiercińska, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/24085664.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    4-aminopyrimidine
    SDS
    CTAB
    R-AgLAFE
    specific adsorption
    Opis:
    The results of 4-aminopyrimidine (4-APM) impact studies on the double layer parameters at the R-AgLAFE/ chlorates(VII) interface in the solutions with different water activity as well as different properties of the mixed adsorption layer of 4-aminopirimidine – sodium 1-decanesulfonate (SDS) and 4- aminopyrimidine - hexadecyltrimethylammonium bromide (CTAB) at the electrode/solution interface are discussed.The differential capacity of the double layer (Cd) at the R-AgLAFE/ basic solution interface was measured using the electrochemical impedance spectroscopy. The zero charge potential (Ez) was determined using a streaming electrode, while the surface tension at the zero charge potential (Yz) was measured using the largest pressure method inside the mercury drop. It was proved that both the 4-aminopirymidine concentration and water activity have an essential effect on the doublelayer parameters on the R-AgLAFE/ chlorates(VII) interface. In the studied systems: 4-APM - SDS and 4-APM - CTAB, 4-aminopyrimidine dominance was observed.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 170204
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous TAPP (transabdominal pre-peritoneal technique) for inguinal hernia and cholecystectomy – a feasible and safe procedure
    Autorzy:
    Lehmann, Andrzej
    Piątkowski, Jacek
    Nowak, Mariusz
    Jackowski, Marek
    Pawlak, Maciej
    Witzling, Mieczysław
    Śmietański, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1395705.pdf
    Data publikacji:
    2014-02-01
    Wydawca:
    Index Copernicus International
    Tematy:
    TAPP
    transabdominal pre-peritoneal technique
    laparoscopic cholecystectomy
    simultaneous
    Opis:
    Inguinal hernia repair and cholecystectomy are amongst the most common surgical procedures performed worldwide. In the recent decades, early disease detection has notably increased due to easily accessible ultrasound. The aim of the study was to assess the safety and the possibility of performing a simultaneous hernia repair and cholecystectomy using the laparoscopic approach. Material and methods. Eight patients (M=100%) with inguinal hernia (3 with bilateral hernia) and cholelithiasis were included in the study. The presence of gallstones was confirmed by imaging. Mean age of the patients was 61.75 years (ranging from 47-72). Simultaneous laparoscopic cholecystectomy and transabdominal pre-peritoneal hernia repair was performed in all patients. Postoperative complications were analyzed to assess the safety and feasibility of the procedure. Results. Mean operating time was 55 minutes (ranging from 30-60) and average length of stay was 3.625 days (ranging from 2-7). In order to perform a cholecystectomy, 1-2 additional trocars were used. No intra-operative complications were observed. At a follow-up visit on postoperative day 7, a small hematoma (10 ml of blood was punctured) in the right groin was noted in one patient. Another patient developed fever postoperatively, treated conservatively with antibiotics. Conclusions. Simultaneous TAPP and cholecystectomy proved to be a safe and feasible procedure. Acceptable operating time and hospital stay, as well as lack of influence on the length of convalescence, may present an interesting alternative to two separate procedures
    Źródło:
    Polish Journal of Surgery; 2014, 86, 2; 73-76
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1000 Liver Transplantations at the Department of General, Transplant and Liver Surgery, Medical University of Warsaw - Analysis of Indications and Results
    Autorzy:
    Krawczyk, Marek
    Grąt, Michał
    Barski, Krzysztof
    Ligocka, Joanna
    Antczak, Arkadiusz
    Kornasiewicz, Oskar
    Skalski, Michał
    Patkowski, Waldemar
    Nyckowski, Paweł
    Zieniewicz, Krzysztof
    Grzelak, Ireneusz
    Pawlak, Jacek
    Alsharabi, Abdulsalam
    Wróblewski, Tadeusz
    Paluszkiewicz, Rafał
    Najnigier, Bogusław
    Dudek, Krzysztof
    Remiszewski, Piotr
    Smoter, Piotr
    Grodzicki, Mariusz
    Korba, Michał
    Kotulski, Marcin
    Cieślak, Bartosz
    Kalinowski, Piotr
    Gierej, Piotr
    Frączek, Mariusz
    Rdzanek, Łukasz
    Stankiewicz, Rafał
    Kobryń, Konrad
    Nazarewski, Łukasz
    Leonowicz, Dorota
    Urban-Lechowicz, Magdalena
    Skwarek, Anna
    Giercuszkiewicz, Dorota
    Paczkowska, Agata
    Piwowarska, Jolanta
    Gelo, Remigiusz
    Andruszkiewicz, Paweł
    Brudkowska, Anna
    Andrzejewska, Renata
    Niewiński, Grzegorz
    Kilińska, Beata
    Zarzycka, Aleksandra
    Nowak, Robert
    Kosiński, Cezary
    Korta, Teresa
    Ołdakowska-Jedynak, Urszula
    Sańko-Resmer, Joanna
    Foroncewicz, Bartosz
    Ziółkowski, Jacek
    Mucha, Krzysztof
    Senatorski, Grzegorz
    Pączek, Leszek
    Habior, Andrzej
    Lechowicz, Robert
    Polański, Sławomir
    Leowska, Elżbieta
    Pacho, Ryszard
    Andrzejewska, Małgorzata
    Rowiński, Olgierd
    Kozieł, Sławomir
    Żurakowski, Jerzy
    Ziarkiewicz-Wróblewska, Bogna
    Górnicka, Barbara
    Hevelke, Piotr
    Michałowicz, Bogdan
    Karwowski, Andrzej
    Szczerbań, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1396689.pdf
    Data publikacji:
    2012-06-01
    Wydawca:
    Index Copernicus International
    Tematy:
    liver transplantation
    indications
    results
    mortality
    Opis:
    The aim of the study was to analyze indications and results of the first one thousand liver transplantations at Chair and Clinic of General, Transplantation and Liver Surgery, Medical University of Warsaw.Material and methods. Data from 1000 transplantations (944 patients) performed at Chair and Clinic of General, Transplantation and Liver Surgery between 1994 and 2011 were analyzed retrospectively. These included 943 first transplantations and 55 retransplantations and 2 re-retransplantations. Frequency of particular indications for first transplantation and retransplantations was established. Perioperative mortality was defined as death within 30 days after the transplantation. Kaplan-Meier survival analysis was used to estimate 5-year patient and graft survival.Results. The most common indications for first transplantation included: liver failure caused by hepatitis C infection (27.8%) and hepatitis B infection (18%) and alcoholic liver disease (17.7%). Early (< 6 months) and late (> 6 months) retransplantations were dominated by hepatic artery thrombosis (54.3%) and recurrence of the underlying disease (45%). Perioperative mortality rate was 8.9% for first transplantations and 34.5% for retransplantations. Five-year patient and graft survival rate was 74.3% and 71%, respectively, after first transplantations and 54.7% and 52.9%, respectively, after retransplantations.Conclusions. Development of liver transplantation program provided more than 1000 transplantations and excellent long-term results. Liver failure caused by hepatitis C and B infections remains the most common cause of liver transplantation and structure of other indications is consistent with European data.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 6; 304-312
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution Of The Results Of 1500 Liver Transplantations Performed In The Department Of General, Transplant And Liver Surgery Medical University Of Warsaw
    Autorzy:
    Krawczyk, Marek
    Grąt, Michał
    Grąt, Karolina
    Wronka, Karolina
    Krasnodębski, Maciej
    Stypułkowski, Jan
    Masior, Łukasz
    Hołówko, Wacław
    Ligocka, Joanna
    Nyckowski, Paweł
    Wróblewski, Tadeusz
    Paluszkiewicz, Rafał
    Patkowski, Waldemar
    Zieniewicz, Krzysztof
    Pączek, Leszek
    Milkiewicz, Piotr
    Ołdakowska-Jedynak, Urszula
    Najnigier, Bogusław
    Dudek, Krzysztof
    Remiszewski, Piotr
    Grzelak, Ireneusz
    Kornasiewicz, Oskar
    Kotulski, Marcin
    Smoter, Piotr
    Grodzicki, Mariusz
    Korba, Michał
    Kalinowski, Piotr
    Skalski, Michał
    Zając, Krzysztof
    Stankiewicz, Rafał
    Przybysz, Marta
    Cieślak, Bartosz
    Nazarewski, Łukasz
    Nowosad, Małgorzata
    Kobryń, Konrad
    Wasilewicz, Michał
    Raszeja-Wyszomirska, Joanna
    Piwowarska, Jolanta
    Giercuszkiewicz, Dorota
    Sańko-Resmer, Joanna
    Rejowski, Sławomir
    Szydłowska-Jakimiuk, Monika
    Górnicka, Barbara
    Wróblewska-Ziarkiewicz, Bogna
    Mazurkiewicz, Michał
    Niewiński, Grzegorz
    Pawlak, Jacek
    Pacho, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1395614.pdf
    Data publikacji:
    2015-05-01
    Wydawca:
    Index Copernicus International
    Tematy:
    liver transplantation
    survival
    outcomes
    donors
    center experience
    center volume
    Opis:
    Liver transplantation is a well-established treatment of patients with end-stage liver disease and selected liver tumors. Remarkable progress has been made over the last years concerning nearly all of its aspects. The aim of this study was to evaluate the evolution of long-term outcomes after liver transplantations performed in the Department of General, Transplant and Liver Surgery (Medical University of Warsaw). Material and methods. Data of 1500 liver transplantations performed between 1989 and 2014 were retrospectively analyzed. Transplantations were divided into 3 groups: group 1 including first 500 operations, group 2 including subsequent 500, and group 3 comprising the most recent 500. Five year overall and graft survival were set as outcome measures. Results. Increased number of transplantations performed at the site was associated with increased age of the recipients (p<0.001) and donors (p<0.001), increased rate of male recipients (p<0.001), and increased rate of piggyback operations (p<0.001), and decreased MELD (p<0.001), as well as decreased blood (p=0.006) and plasma (p<0.001) transfusions. Overall survival was 71.6% at 5 years in group 1, 74.5% at 5 years in group 2, and 85% at 2.9 years in group 3 (p=0.008). Improvement of overall survival was particularly observed for primary transplantations (p=0.004). Increased graft survival rates did not reach the level of significance (p=0.136). Conclusions. Long-term outcomes after liver transplantations performed in the Department of General, Transplant and Liver Surgery are comparable to those achieved in the largest transplant centers worldwide and are continuously improving despite increasing recipient age and wider utilization of organs procured from older donors.
    Źródło:
    Polish Journal of Surgery; 2015, 87, 5; 221-230
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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