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  1. Article ; Online: Transcatheter aortic valve durability, predictors of bioprosthetic valve dysfunction, longer-term outcomes - a review.

    Šolc, Abigail Johanna / Línková, Hana / Toušek, Petr

    Expert review of medical devices

    2024  Volume 21, Issue 1-2, Page(s) 15–26

    Abstract: Introduction: Transcatheter aortic valve implantation (TAVI) is one of the most significant inventions in cardiology, as it provides a viable minimally invasive treatment option for patients with aortic stenosis, the most common valvular disease in the ... ...

    Abstract Introduction: Transcatheter aortic valve implantation (TAVI) is one of the most significant inventions in cardiology, as it provides a viable minimally invasive treatment option for patients with aortic stenosis, the most common valvular disease in the developed world and one with a poor prognosis when left untreated. Using data available to date, this review aims to discuss and identify possible predictors of TAVI valve durability - an essential requirement for the device's wide-spread use, especially in younger patients.
    Areas covered: This article explores the main causes of bioprosthetic valve dysfunction (BVD) based on pathophysiology and available data, and reviews possible predictors of BVD including prosthesis-related, procedure-related, and patient-related factors. An emphasis is made on affectable predictors, which could potentially be targeted with prevention management and improve valve durability. A literature search of online medical databases was conducted using relevant key words and dates; significant clinical trials were identified. A brief overview of important randomized controlled trials with mid to long-term follow-up is included in this article.
    Expert opinion: Identifying modifiable predictors of valve dysfunction presents an opportunity to enhance and predict valve durability - a necessity as patients with longer life-expectancies are being considered for the procedure.
    MeSH term(s) Humans ; Aortic Valve/surgery ; Prosthesis Failure ; Heart Valve Prosthesis ; Treatment Outcome ; Transcatheter Aortic Valve Replacement/adverse effects ; Transcatheter Aortic Valve Replacement/methods ; Aortic Valve Stenosis/surgery ; Bioprosthesis
    Language English
    Publishing date 2024-02-04
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2250857-0
    ISSN 1745-2422 ; 1743-4440
    ISSN (online) 1745-2422
    ISSN 1743-4440
    DOI 10.1080/17434440.2023.2288275
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Telemedicine and the standard of care: a call for a new approach?

    Holčapek, Tomáš / Šolc, Martin / Šustek, Petr

    Frontiers in public health

    2023  Volume 11, Page(s) 1184971

    Abstract: Telemedicine, understood as the provision of health care by a health professional to a patient who is physically not in the same location as the health professional, has many actual and potential benefits. It also has some disadvantages though, including ...

    Abstract Telemedicine, understood as the provision of health care by a health professional to a patient who is physically not in the same location as the health professional, has many actual and potential benefits. It also has some disadvantages though, including a higher risk of misdiagnosis or another unfavorable outcome of certain remotely-provided services. In principle, the regime of legal liability for medical malpractice is the same for telemedicine as for traditional physical care. The general outline of the standard of care, which includes respect for medical science, the patient's individuality and objective possibilities, is abstract and flexible enough to be used for remote care without the need for redefinition. The quality of health care should be evaluated on the basis of the whole scale of risks and benefits it brings to a particular patient, including accessibility and comfort. In general, it should be permissible to provide a medical service remotely on the condition that its overall quality is at least as good as its comparable physical alternative. In other words, certain decrease in quality of some aspects of remote care can be compensated by other advantages. In terms of public health, support for telemedicine may bring a great improvement in the access to health care, and thus help significantly the individual members of the population. From the individual perspective, respect for personal autonomy implies that a patient should have every right to opt for a remote service, provided that there exists a true choice between meaningful options which is made on the basis of full information. If telemedicine is to fulfill its potential without sacrificing the protection of patients and their rights, reasonable guidelines for remote services need to be defined for particular medical fields, and for specific procedures within them. Among other issues, these guidelines must address the question of when it is necessary to refer the patient to physical care.
    MeSH term(s) Humans ; Standard of Care ; Telemedicine ; Delivery of Health Care ; Malpractice ; Liability, Legal
    Language English
    Publishing date 2023-05-04
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2711781-9
    ISSN 2296-2565 ; 2296-2565
    ISSN (online) 2296-2565
    ISSN 2296-2565
    DOI 10.3389/fpubh.2023.1184971
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Emergency unmanned airborne spectrometric (HPGe) monitoring system.

    Rusňák, Jan / Šuráň, Jiří / Šolc, Jaroslav / Kovář, Petr / Bohuslav, Petr / Nohýl, Jiří

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2023  Volume 194, Page(s) 110677

    Abstract: After a nuclear or radiation event, emergency responders and radiation protection authorities need quick and credible information based on reliable accident and post-accident radiological data. However, risks to people in the vicinity of the source pose ... ...

    Abstract After a nuclear or radiation event, emergency responders and radiation protection authorities need quick and credible information based on reliable accident and post-accident radiological data. However, risks to people in the vicinity of the source pose serious measurement challenges. Many problems could be solved by unmanned airborne monitoring systems, but the current ones are mostly based on non-spectrometric detectors carried by drones with low bearing, short flying range and flight time. Therefore spectrometric monitoring system based on High-Purity Germanium (HPGe) detector carried by powerful unmanned helicopter has been developed. The presented unmanned aerial spectrometric system is reliable and heavy-duty and enables quick and safe identification of released radionuclides, thus provides a basis for determining the plant damage state and for planning of emergency and contamination zones. The system will support timely, effective actions that protect the public and environment against the effects of ionizing radiation. The paper describes development and performance tests of this novel system.
    Language English
    Publishing date 2023-01-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2023.110677
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Subtraction of natural radiation contribution from gamma-ray spectra measured by HPGe detector.

    Kovář, Petr / Šolc, Jaroslav

    Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

    2017  

    Abstract: A method is described for the subtraction of Monte Carlo simulated detector spectra of the contribution of natural radiation to measured detector spectra aiming to decrease the decision threshold for the detection of artificial radionuclides. HPGe ... ...

    Abstract A method is described for the subtraction of Monte Carlo simulated detector spectra of the contribution of natural radiation to measured detector spectra aiming to decrease the decision threshold for the detection of artificial radionuclides. HPGe detector spectra were simulated for selected naturally occurring radionuclides deposited onto a filter used for aerosol collection in a newly developed airborne radioactivity monitoring system. Stepwise, the simulated spectra were fitted to the actually acquired gamma-ray spectrum and the decision threshold was determined. Contribution of cosmic rays background was also estimated.
    Language English
    Publishing date 2017-07-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 1142596-9
    ISSN 1872-9800 ; 0883-2889 ; 0969-8043
    ISSN (online) 1872-9800
    ISSN 0883-2889 ; 0969-8043
    DOI 10.1016/j.apradiso.2017.07.024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: RanGTP and importin β regulate meiosis I spindle assembly and function in mouse oocytes.

    Drutovic, David / Duan, Xing / Li, Rong / Kalab, Petr / Solc, Petr

    The EMBO journal

    2019  Volume 39, Issue 1, Page(s) e101689

    Abstract: Homologous chromosome segregation during meiosis I (MI) in mammalian oocytes is carried out by the acentrosomal MI spindles. Whereas studies in human oocytes identified Ran GTPase as a crucial regulator of the MI spindle function, experiments in mouse ... ...

    Abstract Homologous chromosome segregation during meiosis I (MI) in mammalian oocytes is carried out by the acentrosomal MI spindles. Whereas studies in human oocytes identified Ran GTPase as a crucial regulator of the MI spindle function, experiments in mouse oocytes questioned the generality of this notion. Here, we use live-cell imaging with fluorescent probes and Förster resonance energy transfer (FRET) biosensors to monitor the changes in Ran and importin β signaling induced by perturbations of Ran in mouse oocytes while examining the MI spindle dynamics. We show that unlike RanT24N employed in previous studies, a RanT24N, T42A double mutant inhibits RanGEF without perturbing cargo binding to importin β and disrupts MI spindle function in chromosome segregation. Roles of Ran and importin β in the coalescence of microtubule organizing centers (MTOCs) and MI spindle assembly are further supported by the use of the chemical inhibitor importazole, whose effects are partially rescued by the GTP hydrolysis-resistant RanQ69L mutant. These results indicate that RanGTP is essential for MI spindle assembly and function both in humans and mice.
    MeSH term(s) Animals ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; Chromosome Segregation ; Female ; Guanine Nucleotide Exchange Factors/genetics ; Guanine Nucleotide Exchange Factors/metabolism ; Meiosis/physiology ; Mice ; Microtubules/metabolism ; Mutation ; Nuclear Proteins/genetics ; Nuclear Proteins/metabolism ; Oocytes/cytology ; Oocytes/metabolism ; Spindle Apparatus/physiology ; beta Karyopherins/genetics ; beta Karyopherins/metabolism ; ran GTP-Binding Protein/genetics ; ran GTP-Binding Protein/metabolism
    Chemical Substances Cell Cycle Proteins ; Guanine Nucleotide Exchange Factors ; Nuclear Proteins ; Rcc1 protein, mouse ; beta Karyopherins ; ran GTP-Binding Protein (EC 3.6.5.2)
    Language English
    Publishing date 2019-10-16
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.15252/embj.2019101689
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Measuring and Monte Carlo Modelling of X-Ray and Gamma-Ray Attenuation in Personal Radiation Shielding Protective Clothing.

    Kozlovska, Michaela / Solc, Jaroslav / Otahal, Petr

    Computational and mathematical methods in medicine

    2019  Volume 2019, Page(s) 1641895

    Abstract: A collection of personal protective equipment (PPE), suitable for use in case of accident in nuclear facilities or radiological emergencies, was gathered at the National Institute for Nuclear, Chemical and Biological Protection, Czech Republic. The ... ...

    Abstract A collection of personal protective equipment (PPE), suitable for use in case of accident in nuclear facilities or radiological emergencies, was gathered at the National Institute for Nuclear, Chemical and Biological Protection, Czech Republic. The shielding characteristics of the various PPE materials were measured via narrow geometry spectral attenuation measurements with point radionuclide sources covering a broad range of photon energies. Photon relative penetration and attenuation for relevant energies of the spectra were the principal experimentally determined quantities for tested PPE. Monte Carlo simulations in the MCNPX™ code were carried out to determine photon attenuation for respective energies in the tested PPE, and the results were compared to those determined experimentally. Energy depositions in a unit volume of an ORNL phantom were simulated in a radioactive aerosols atmospheric environment to determine effective doses both for the whole body and in various organs in the human torso during exposure to different dispersed radioactive aerosols while wearing one of the PPE protecting against X- and gamma-ray. This work aimed to determine the effective dose and its decrease for individual PPE protecting against X- and gamma-ray.
    MeSH term(s) Aerosols ; Computer Simulation ; Gamma Rays ; Humans ; Monte Carlo Method ; Photons ; Protective Clothing ; Radiation Dosage ; Radiation Protection/instrumentation ; Radiation Protection/methods ; Radiography ; Scattering, Radiation ; X-Rays
    Chemical Substances Aerosols
    Language English
    Publishing date 2019-11-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2252430-7
    ISSN 1748-6718 ; 1748-670X ; 1027-3662
    ISSN (online) 1748-6718
    ISSN 1748-670X ; 1027-3662
    DOI 10.1155/2019/1641895
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Aurora kinase A is essential for meiosis in mouse oocytes.

    Blengini, Cecilia S / Ibrahimian, Patricia / Vaskovicova, Michaela / Drutovic, David / Solc, Petr / Schindler, Karen

    PLoS genetics

    2021  Volume 17, Issue 4, Page(s) e1009327

    Abstract: The Aurora protein kinases are well-established regulators of spindle building and chromosome segregation in mitotic and meiotic cells. In mouse oocytes, there is significant Aurora kinase A (AURKA) compensatory abilities when the other Aurora kinase ... ...

    Abstract The Aurora protein kinases are well-established regulators of spindle building and chromosome segregation in mitotic and meiotic cells. In mouse oocytes, there is significant Aurora kinase A (AURKA) compensatory abilities when the other Aurora kinase homologs are deleted. Whether the other homologs, AURKB or AURKC can compensate for loss of AURKA is not known. Using a conditional mouse oocyte knockout model, we demonstrate that this compensation is not reciprocal because female oocyte-specific knockout mice are sterile, and their oocytes fail to complete meiosis I. In determining AURKA-specific functions, we demonstrate that its first meiotic requirement is to activate Polo-like kinase 1 at acentriolar microtubule organizing centers (aMTOCs; meiotic spindle poles). This activation induces fragmentation of the aMTOCs, a step essential for building a bipolar spindle. We also show that AURKA is required for regulating localization of TACC3, another protein required for spindle building. We conclude that AURKA has multiple functions essential to completing MI that are distinct from AURKB and AURKC.
    MeSH term(s) Animals ; Aurora Kinase A/genetics ; Aurora Kinase B/genetics ; Aurora Kinase C/genetics ; Cell Cycle Proteins/genetics ; Cell Nucleus Division/genetics ; Chromosome Segregation/genetics ; Female ; Fetal Proteins/genetics ; Gene Expression Regulation, Developmental/genetics ; Humans ; Meiosis/genetics ; Mice ; Microtubule-Associated Proteins/genetics ; Microtubule-Organizing Center/metabolism ; Oocytes/growth & development ; Oocytes/metabolism ; Protein Serine-Threonine Kinases/genetics ; Proto-Oncogene Proteins/genetics ; Spindle Apparatus/genetics ; Spindle Poles/genetics ; Polo-Like Kinase 1
    Chemical Substances Cell Cycle Proteins ; Fetal Proteins ; Microtubule-Associated Proteins ; Proto-Oncogene Proteins ; TACC3 protein, mouse ; Aurkb protein, mouse (EC 2.7.11.1) ; Aurkc protein, mouse (EC 2.7.11.1) ; Aurora Kinase A (EC 2.7.11.1) ; Aurora Kinase B (EC 2.7.11.1) ; Aurora Kinase C (EC 2.7.11.1) ; Protein Serine-Threonine Kinases (EC 2.7.11.1)
    Language English
    Publishing date 2021-04-26
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2186725-2
    ISSN 1553-7404 ; 1553-7390
    ISSN (online) 1553-7404
    ISSN 1553-7390
    DOI 10.1371/journal.pgen.1009327
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: CDC25B is required for the metaphase I-metaphase II transition in mouse oocytes.

    Ferencova, Ivana / Vaskovicova, Michaela / Drutovic, David / Knoblochova, Lucie / Macurek, Libor / Schultz, Richard M / Solc, Petr

    Journal of cell science

    2022  Volume 135, Issue 6

    Abstract: Mammalian oocytes are arrested at meiotic prophase I. The dual-specificity phosphatase CDC25B is essential for cyclin-dependent kinase 1 (CDK1) activation that drives resumption of meiosis. CDC25B reverses the inhibitory effect of the protein kinases ... ...

    Abstract Mammalian oocytes are arrested at meiotic prophase I. The dual-specificity phosphatase CDC25B is essential for cyclin-dependent kinase 1 (CDK1) activation that drives resumption of meiosis. CDC25B reverses the inhibitory effect of the protein kinases WEE1 and MYT1 on CDK1 activation. Cdc25b-/- female mice are infertile because oocytes cannot activate CDK1. To identify a role for CDC25B following resumption of meiosis, we restored CDK1 activation in Cdc25b-/- oocytes by inhibiting WEE1 and MYT1, or expressing EGFP-CDC25A or constitutively active EGFP-CDK1 from microinjected complementary RNAs. Forced CDK1 activation in Cdc25b-/- oocytes allowed resumption of meiosis, but oocytes mostly arrested at metaphase I (MI) with intact spindles. Similarly, approximately a third of Cdc25b+/- oocytes with a reduced amount of CDC25B arrested in MI. MI-arrested Cdc25b-/- oocytes also displayed a transient decrease in CDK1 activity similar to Cdc25b+/+ oocytes during the MI-MII transition, whereas Cdc25b+/- oocytes exhibited only a partial anaphase-promoting complex/cyclosome activation and anaphase I entry. Thus, CDC25B is necessary for the resumption of meiosis and the MI-MII transition.
    MeSH term(s) Anaphase ; Anaphase-Promoting Complex-Cyclosome/metabolism ; Animals ; Female ; Mammals ; Meiosis ; Metaphase ; Mice ; Oocytes/metabolism ; cdc25 Phosphatases
    Chemical Substances Anaphase-Promoting Complex-Cyclosome (EC 2.3.2.27) ; Cdc25b protein, mouse (EC 3.1.3.48) ; cdc25 Phosphatases (EC 3.1.3.48)
    Language English
    Publishing date 2022-03-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2993-2
    ISSN 1477-9137 ; 0021-9533
    ISSN (online) 1477-9137
    ISSN 0021-9533
    DOI 10.1242/jcs.252924
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Triple-Color Live Imaging of Mouse Oocytes.

    Courtois, Aurélien / Solc, Petr / Kitajima, Tomoya S

    Methods in molecular biology (Clifton, N.J.)

    2018  Volume 1818, Page(s) 89–97

    Abstract: Meiotic division is a dynamic process that exhibits active interactive behaviors amongst different intracellular structures and components for spindle assembly and chromosome segregation. Understanding the mechanisms of meiotic spindle assembly and ... ...

    Abstract Meiotic division is a dynamic process that exhibits active interactive behaviors amongst different intracellular structures and components for spindle assembly and chromosome segregation. Understanding the mechanisms of meiotic spindle assembly and chromosome segregation therefore requires a quantitative analysis of spatiotemporal relationships among different structures and components. In this chapter, we describe a method for triple-color live imaging of meiotic division in mouse oocytes. This approach combines the microinjection of RNAs encoding proteins tagged with green and red fluorescent proteins and the visualization of microtubules with the fluorogenic far-red probe SiR-Tubulin. This method enables the simultaneous spatiotemporal mapping of three different components of the spindle and chromosomes, which opens the way to quantitative analysis of their interactive behaviors.
    MeSH term(s) Animals ; Cells, Cultured ; Chromosome Segregation ; Female ; Green Fluorescent Proteins/metabolism ; Image Processing, Computer-Assisted ; Luminescent Proteins/metabolism ; Meiosis ; Mice ; Microscopy, Fluorescence/methods ; Microtubules/metabolism ; Oocytes/cytology ; Oocytes/physiology ; Spindle Apparatus/metabolism ; Tubulin/metabolism ; Red Fluorescent Protein
    Chemical Substances Luminescent Proteins ; Tubulin ; Green Fluorescent Proteins (147336-22-9)
    Language English
    Publishing date 2018-07-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-4939-8603-3_10
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Measuring and Monte Carlo Modelling of X-Ray and Gamma-Ray Attenuation in Personal Radiation Shielding Protective Clothing

    Michaela Kozlovska / Jaroslav Solc / Petr Otahal

    Computational and Mathematical Methods in Medicine, Vol

    2019  Volume 2019

    Abstract: A collection of personal protective equipment (PPE), suitable for use in case of accident in nuclear facilities or radiological emergencies, was gathered at the National Institute for Nuclear, Chemical and Biological Protection, Czech Republic. The ... ...

    Abstract A collection of personal protective equipment (PPE), suitable for use in case of accident in nuclear facilities or radiological emergencies, was gathered at the National Institute for Nuclear, Chemical and Biological Protection, Czech Republic. The shielding characteristics of the various PPE materials were measured via narrow geometry spectral attenuation measurements with point radionuclide sources covering a broad range of photon energies. Photon relative penetration and attenuation for relevant energies of the spectra were the principal experimentally determined quantities for tested PPE. Monte Carlo simulations in the MCNPX™ code were carried out to determine photon attenuation for respective energies in the tested PPE, and the results were compared to those determined experimentally. Energy depositions in a unit volume of an ORNL phantom were simulated in a radioactive aerosols atmospheric environment to determine effective doses both for the whole body and in various organs in the human torso during exposure to different dispersed radioactive aerosols while wearing one of the PPE protecting against X- and gamma-ray. This work aimed to determine the effective dose and its decrease for individual PPE protecting against X- and gamma-ray.
    Keywords Computer applications to medicine. Medical informatics ; R858-859.7
    Language English
    Publishing date 2019-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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