LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 103

Search options

  1. Article ; Online: The impact of SARS-Covid-19 pandemic on peripheral nerve surgery - A single centre report.

    Minzenmay, Lena / Antoniadis, Gregor / Paľa, Andrej / Bäzner, Ute Marlies / Knoll, Andreas / Petkov, Martin / Wirtz, Christian Rainer / Pedro, Maria Teresa

    Clinical neurology and neurosurgery

    2024  Volume 237, Page(s) 108124

    Abstract: Objective: SARS-Cov-19 pandemic totally changed daily routine work in German hospitals. As hospital capacity was reduced, many surgeries were postponed or even cancelled. On March 25th 2020 the German Society of Neurosurgery (DGNC) published a statement ...

    Abstract Objective: SARS-Cov-19 pandemic totally changed daily routine work in German hospitals. As hospital capacity was reduced, many surgeries were postponed or even cancelled. On March 25th 2020 the German Society of Neurosurgery (DGNC) published a statement in which urgent non-elective surgeries were defined for each neurosurgical domain, whereas elective interventions were deferred. The present work examines the impact of these Covid strategies focusing on patients with peripheral lesions who were conducted to our department during this period of time.
    Methods: All patients who underwent any peripheral nerve surgery at our department from January 2018 until December 2022, were included. The complete range of surgeries including peripheral nerve lesions was examined encompassing compression syndromes, traumatic lesions of brachial plexus, traumatic lesions and tumors of single peripheral nerves. The numbers of surgical procedures were compared before, during and after pandemic. Pearson correlation coefficient was analysed.
    Results: From 2018 to 2022 the total number of surgical procedures involving peripheral nerves included 2422 procedures. Compression syndromes made up the largest proportion (1433 operations, 59%), followed by peripheral nerve lesions (445 operations, 18%), peripheral nerve tumors (344 operations, 14%) and lesions of the brachial plexus (142 operations, 6%). The average was 40,5 interventions per month, the range was 7-63. Two declines in the number of peripheral nerve surgeries were noted during this period. The first was in April and May 2020 with an average drop of 65% and 41% respectively. In these months the average number of operations was 37. The second decrease was from October 2021 until January 2022, where number of surgeries was reduced by 16%, 36%, 83% and 18% with an average number of 50 operations. Both declines showed a significant and strong correlation with the lower number of compression syndrome treatments (r = 0.952, p < 0.001 and r = 0.968, p < 0.001), while no drop and no significant correlation was found in the treatment of traumatic peripheral nerve injuries (p = 0.769, r = 0.095 and p = 0.243, r = 0.366) and traumatic brachial plexus injuries (p = 0.787, r = 0.088 and p = 0.780, r = 0.09). A weak significant correlation was seen in the treatment numbers of peripheral nerve tumors (p = 0.017, r = 0.672 and p = 0.015, r = 0.67).
    Conclusion: Covid-19 pandemic lead to a significant decrease in the number of nerve decompressions, since, according to the German Society of Neurosurgery, those were considered as elective surgeries.
    MeSH term(s) Humans ; COVID-19/epidemiology ; Pandemics ; Neurosurgical Procedures ; Peripheral Nerves/surgery ; Peripheral Nervous System Neoplasms/surgery
    Language English
    Publishing date 2024-01-19
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 193107-6
    ISSN 1872-6968 ; 0303-8467
    ISSN (online) 1872-6968
    ISSN 0303-8467
    DOI 10.1016/j.clineuro.2024.108124
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Monocytes and Macrophages in COVID-19.

    Knoll, Rainer / Schultze, Joachim L / Schulte-Schrepping, Jonas

    Frontiers in immunology

    2021  Volume 12, Page(s) 720109

    Abstract: COVID-19 is a contagious viral disease caused by SARS-CoV-2 that led to an ongoing pandemic with massive global health and socioeconomic consequences. The disease is characterized primarily, but not exclusively, by respiratory clinical manifestations ... ...

    Abstract COVID-19 is a contagious viral disease caused by SARS-CoV-2 that led to an ongoing pandemic with massive global health and socioeconomic consequences. The disease is characterized primarily, but not exclusively, by respiratory clinical manifestations ranging from mild common cold symptoms, including cough and fever, to severe respiratory distress and multi-organ failure. Macrophages, a heterogeneous group of yolk-sac derived, tissue-resident mononuclear phagocytes of complex ontogeny present in all mammalian organs, play critical roles in developmental, homeostatic and host defense processes with tissue-dependent plasticity. In case of infection, they are responsible for early pathogen recognition, initiation and resolution of inflammation, as well as repair of tissue damage. Monocytes, bone-marrow derived blood-resident phagocytes, are recruited under pathological conditions such as viral infections to the affected tissue to defend the organism against invading pathogens and to aid in efficient resolution of inflammation. Given their pivotal function in host defense and the potential danger posed by their dysregulated hyperinflammation, understanding monocyte and macrophage phenotypes in COVID-19 is key for tackling the disease's pathological mechanisms. Here, we outline current knowledge on monocytes and macrophages in homeostasis and viral infections and summarize concepts and key findings on their role in COVID-19. While monocytes in the blood of patients with moderate COVID-19 present with an inflammatory, interferon-stimulated gene (ISG)-driven phenotype, cellular dysfunction epitomized by loss of HLA-DR expression and induction of S100 alarmin expression is their dominant feature in severe disease. Pulmonary macrophages in COVID-19 derived from infiltrating inflammatory monocytes are in a hyperactivated state resulting in a detrimental loop of pro-inflammatory cytokine release and recruitment of cytotoxic effector cells thereby exacerbating tissue damage at the site of infection.
    MeSH term(s) COVID-19/immunology ; COVID-19/pathology ; HLA-DR Antigens/immunology ; Humans ; Inflammation/immunology ; Inflammation/pathology ; Macrophages/immunology ; Macrophages/pathology ; Monocytes/immunology ; Monocytes/pathology ; SARS-CoV-2/immunology ; Severity of Illness Index
    Chemical Substances HLA-DR Antigens
    Language English
    Publishing date 2021-07-21
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2021.720109
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Combined stent retriever angioplasty and continuous intra-arterial nimodipine infusion as salvage therapy for cerebral vasospasm and delayed cerebral ischemia after subarachnoid hemorrhage: illustrative case.

    Knoll, Andreas / Durner, Gregor / Braun, Michael / Schmitz, Bernd / Wirtz, Christian Rainer / König, Ralph / Pala, Andrej

    Journal of neurosurgery. Case lessons

    2023  Volume 6, Issue 14

    Abstract: Background: Delayed cerebral ischemia (DCI) and cerebral vasospasm (CV) are severe complications of spontaneous subarachnoid hemorrhage (SAH) contributing to an inferior outcome. Rescue therapies include intra-arterial balloon angioplasty and repetitive ...

    Abstract Background: Delayed cerebral ischemia (DCI) and cerebral vasospasm (CV) are severe complications of spontaneous subarachnoid hemorrhage (SAH) contributing to an inferior outcome. Rescue therapies include intra-arterial balloon angioplasty and repetitive and finally continuous intra-arterial nimodipine infusion.
    Observations: In the presented case, a young female patient with fulminant refractory DCI and CV, despite induced hypertension and nimodipine application, was treated with three-vessel continuous intra-arterial infusion and additional repetitive angioplasty of the basilar and middle cerebral arteries using a stent retriever, leading to a good clinical outcome. Additional stent retriever dilatation to continuous intra-arterial nimodipine application in three vessel territories may represent a further escalation step in the rescue therapy for severe CV and DCI after SAH. Montreal Cognitive Assessment and SF-36 testing showed satisfactory results 3 months after initial treatment with intra-arterial nimodipine catheters in three vessel territory circulations and additional stent retriever vasodilation of severe CV.
    Lessons: We report a unique rescue strategy involving implantation of an additional intra-arterial catheter into the vertebral artery and repetitive stent retriever dilatations of the middle cerebral and basilar arteries as an extra therapy for continuous intra-arterial nimodipine vaspospasmolytic therapy in three vessel territories, resulting in a very good clinical outcome.
    Language English
    Publishing date 2023-10-02
    Publishing country United States
    Document type Journal Article
    ISSN 2694-1902
    ISSN (online) 2694-1902
    DOI 10.3171/CASE23339
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Biodegradable arginine based steroid-surfactants: Cationic green agents for hydrophobic ion-pairing.

    Matteo Jörgensen, Arne / Knoll, Patrick / Haddadzadegan, Soheil / Fabian, Hannah / Hupfauf, Andrea / Gust, Ronald / Georg Jörgensen, Rainer / Bernkop-Schnürch, Andreas

    International journal of pharmaceutics

    2022  Volume 630, Page(s) 122438

    Abstract: The aim of this study was to evaluate the safety and efficacy for hydrophobic ion-pairing of surfactants based on arginine (Arg). The prepared Arg-cholesteryl ester (ACE) and Arg-diosgenyl ester (ADE) were characterized regarding solubility, pKa, ... ...

    Abstract The aim of this study was to evaluate the safety and efficacy for hydrophobic ion-pairing of surfactants based on arginine (Arg). The prepared Arg-cholesteryl ester (ACE) and Arg-diosgenyl ester (ADE) were characterized regarding solubility, pKa, critical micellar concentration (CMC), biodegradability as well as membrane- and aquatic toxicity using DOTAP as reference. The ability for hydrophobic ion-pairing was evaluated and the lipophilicity of formed complexes was determined. NMR, FT-IR and MS confirmed successful synthesis of Arg-surfactants. The slightly soluble single-charged Arg-surfactants (pH < pKa
    Language English
    Publishing date 2022-12-01
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 428962-6
    ISSN 1873-3476 ; 0378-5173
    ISSN (online) 1873-3476
    ISSN 0378-5173
    DOI 10.1016/j.ijpharm.2022.122438
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article: Prognostic Gene Expression, Stemness and Immune Microenvironment in Pediatric Tumors.

    Stahl, David / Knoll, Rainer / Gentles, Andrew J / Vokuhl, Christian / Buness, Andreas / Gütgemann, Ines

    Cancers

    2021  Volume 13, Issue 4

    Abstract: Pediatric tumors frequently arise from embryonal cells, often displaying a stem cell-like ("small round blue") morphology in tissue sections. Because recently "stemness" has been associated with a poor immune response in tumors, we investigated the ... ...

    Abstract Pediatric tumors frequently arise from embryonal cells, often displaying a stem cell-like ("small round blue") morphology in tissue sections. Because recently "stemness" has been associated with a poor immune response in tumors, we investigated the association of prognostic gene expression, stemness and the immune microenvironment systematically using transcriptomes of 4068 tumors occurring mostly at the pediatric and young adult age. While the prognostic landscape of gene expression (PRECOG) and infiltrating immune cell types (CIBERSORT) is similar to that of tumor entities occurring mainly in adults, the patterns are distinct for each diagnostic entity. A high stemness score (mRNAsi) correlates with clinical and morphologic subtype in Wilms tumors, neuroblastomas, synovial sarcomas, atypical teratoid rhabdoid tumors and germ cell tumors. In neuroblastomas, a high mRNAsi is associated with shortened overall survival. In Wilms tumors a high mRNAsi correlates with blastemal morphology, whereas tumors with predominant epithelial or stromal differentiation have a low mRNAsi and a high percentage of M2 type macrophages. This could be validated in Wilms tumor tissue (
    Language English
    Publishing date 2021-02-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers13040854
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: The Benefit of Intraoperative Magnetic Resonance Imaging in Endoscopic and Microscopic Transsphenoidal Resection of Recurrent Pituitary Adenomas.

    Pala, Andrej / Knoll, Andreas / Schneider, Max / Etzrodt-Walter, Gwendolin / Karpel-Massler, Georg / Wirtz, Christian Rainer / Hlavac, Michal

    Current oncology (Toronto, Ont.)

    2022  Volume 29, Issue 1, Page(s) 392–401

    Abstract: The surgical treatment of recurrent adenomas can be challenging. Intraoperative magnetic resonance imaging (iMRI) can improve the orientation and increase the safe extent of resection. We conducted a quantitative and qualitative retrospective analysis of ...

    Abstract The surgical treatment of recurrent adenomas can be challenging. Intraoperative magnetic resonance imaging (iMRI) can improve the orientation and increase the safe extent of resection. We conducted a quantitative and qualitative retrospective analysis of recurrent adenomas treated by endoscopic or microscopic iMRI-assisted transsphenoidal surgery. A total number of 59 resections were selected. Detailed volumetric measurements, tumor characteristics, and MRI features of intraoperative remnants were evaluated. Intraoperative MRI increased the gross total resection (GTR) rate from 33.9% to 49.2%. Common locations of tumor remnants after iMRI were the clivus, the wall of the cavernous sinus or the perforation of the diaphragm. Increasing tumor volume and the microscopic technique were significantly associated with further resection after iMRI in the univariate analysis (
    MeSH term(s) Adenoma/diagnostic imaging ; Adenoma/surgery ; Endoscopy/methods ; Humans ; Magnetic Resonance Imaging/methods ; Pituitary Neoplasms/diagnostic imaging ; Pituitary Neoplasms/surgery ; Retrospective Studies
    Language English
    Publishing date 2022-01-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1236972-x
    ISSN 1718-7729 ; 1198-0052
    ISSN (online) 1718-7729
    ISSN 1198-0052
    DOI 10.3390/curroncol29010035
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Conference proceedings: Clinical outcome after surgical treatment of traumatic peroneal nerve injury – single centre experience in 93 cases over the last 10 years

    Werkmann, Daniel Nicholas / Knoll, Andreas / Pedro, Maria Teresa / Antoniadis, Gregor / Wirtz, Christian Rainer / Pala, Andrej

    2022  , Page(s) P034

    Title translation Klinisches Outcome nach Operation traumatischer Läsionen des Nervus peroneus: eine monozentrische Analyse von 93 Fällen der letzten 10 Jahre
    Event/congress 73. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Griechischen Gesellschaft für Neurochirurgie; Köln; Deutsche Gesellschaft für Neurochirurgie; 2022
    Keywords Medizin, Gesundheit
    Publishing date 2022-05-25
    Publisher German Medical Science GMS Publishing House; Düsseldorf
    Document type Conference proceedings
    DOI 10.3205/22dgnc348
    Database German Medical Science

    More links

    Kategorien

  8. Conference proceedings: Clinical features and outcome after iMRI assisted resection of GH producing pituitary adenomas

    Pala, Andrej / Knoll, Andreas / Etzrodt-Walter, Gwendolin / Coburger, Jan / Wirtz, Christian Rainer / Hlavac, Michal

    2021  , Page(s) P031

    Title translation Ergebnisse nach der iMRT-assistierten Resektion der STH-produzierenden Hypophysenadenome
    Event/congress 72. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Polnischen Gesellschaft für Neurochirurgie; sine loco [digital]; Deutsche Gesellschaft für Neurochirurgie; 2021
    Keywords Medizin, Gesundheit
    Publishing date 2021-06-04
    Publisher German Medical Science GMS Publishing House; Düsseldorf
    Document type Conference proceedings
    DOI 10.3205/21dgnc319
    Database German Medical Science

    More links

    Kategorien

  9. Conference proceedings: Risk factors for additional resection after intraoperative MRI in less invasive pituitary adenomas Knosp 0-2

    Hlavac, Michal / Knoll, Andreas / Etzrodt-Walter, Gwendolin / Coburger, Jan / Wirtz, Christian Rainer / Pala, Andrej

    2021  , Page(s) V227

    Title translation Risikofaktor für eine Nachresektion nach der Durchführung von iMRT in der Resektion der Hypophysenadenome Knosp 0-2
    Event/congress 72. Jahrestagung der Deutschen Gesellschaft für Neurochirurgie (DGNC), Joint Meeting mit der Polnischen Gesellschaft für Neurochirurgie; sine loco [digital]; Deutsche Gesellschaft für Neurochirurgie; 2021
    Keywords Medizin, Gesundheit
    Publishing date 2021-06-04
    Publisher German Medical Science GMS Publishing House; Düsseldorf
    Document type Conference proceedings
    DOI 10.3205/21dgnc218
    Database German Medical Science

    More links

    Kategorien

  10. Article: Integration of a microscope into a centrifuge for adhesion force measurement of particles

    Knoll, Johannes / Hermann Nirschl / Wolf-Rainer Dammert

    Powder technology. 2017 Jan., v. 305

    2017  

    Abstract: The centrifuge method is one tool for the measurement of particle adhesion forces. The method is well established for single particles with a detachment in normal direction to the substrate. In order to consider a detachment in radial direction and ... ...

    Abstract The centrifuge method is one tool for the measurement of particle adhesion forces. The method is well established for single particles with a detachment in normal direction to the substrate. In order to consider a detachment in radial direction and particle-particle interactions, an optical centrifuge was designed and built. The arrangement of the optical components in the centrifuge corresponds to a microscope configuration. The use of a mechanical image derotation device allows the application of a non-rotating camera. Thus, it is possible to continuously and online observe an enlarged image of the sample during the centrifugation.
    Keywords adhesion ; cameras ; centrifugation ; microscopes ; powders
    Language English
    Dates of publication 2017-01
    Size p. 147-155.
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0032-5910
    DOI 10.1016/j.powtec.2016.09.065
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top