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  1. Article ; Online: Reply to Author.

    Walk, Jona / Janssen, Rob / Dofferhoff, Anton S M

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America

    2021  Volume 73, Issue 7, Page(s) 1325

    Language English
    Publishing date 2021-03-18
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 1099781-7
    ISSN 1537-6591 ; 1058-4838
    ISSN (online) 1537-6591
    ISSN 1058-4838
    DOI 10.1093/cid/ciab166
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: COVID-19-associated pulmonary aspergillosis: a prospective single-center dual case series.

    Meijer, Eelco F J / Dofferhoff, Anton S M / Hoiting, Oscar / Meis, Jacques F

    Mycoses

    2021  Volume 64, Issue 4, Page(s) 457–464

    Abstract: Background: COVID-19-associated pulmonary aspergillosis (CAPA) has emerged as an invasive fungal disease, often affecting previously immunocompetent, mechanically ventilated, intensive care unit (ICU) patients. Incidence rates of 3.8%-33.3% have been ... ...

    Abstract Background: COVID-19-associated pulmonary aspergillosis (CAPA) has emerged as an invasive fungal disease, often affecting previously immunocompetent, mechanically ventilated, intensive care unit (ICU) patients. Incidence rates of 3.8%-33.3% have been reported depending on the geographic area, with high (47%) mortality.
    Objectives: Here, we describe a single-centre prospective case series with CAPA cases from both the first (March-May, n = 5/33) and second (mid-September through mid-December, n = 8/33) COVID-19 wave at a 500-bed teaching hospital in the Netherlands.
    Patients/methods: In the first COVID-19 wave, a total of 265 SARS-CoV-2 PCR-positive patients were admitted to our hospital of whom 33 needed intubation and mechanical ventilation. In the second wave, 508 SARS-CoV-2 PCR-positive patients were admitted of whom 33 needed mechanical ventilation. Data were prospectively collected.
    Results: We found a significant decrease in COVID-19 patients needing mechanical ventilation in the ICU in the second wave (p < .01). From these patients, however, a higher percentage were diagnosed with CAPA (24.2% vs 15.2%), although not significant (p = .36). All CAPA patients encountered in the second wave received dexamethasone. Mortality between both groups was similarly high (40%-50%). Moreover, we found environmental TR
    Conclusions: In this series, 19.7% (n = 13/66) of mechanically ventilated SARS-CoV-2 patients were diagnosed with CAPA. In addition, we found a significant reduction in COVID-19 patients needing mechanical ventilation on the ICU in the second wave. Numbers are too small to determine whether there is a true difference in CAPA incidence in mechanically ventilated patients between the two waves, and whether it could be attributed to dexamethasone SARS-CoV-2 therapy.
    MeSH term(s) Aged ; COVID-19/complications ; COVID-19/diagnosis ; Cohort Studies ; Female ; Humans ; Intensive Care Units ; Male ; Netherlands/epidemiology ; Polymerase Chain Reaction ; Prospective Studies ; Pulmonary Aspergillosis/complications ; Pulmonary Aspergillosis/epidemiology ; Pulmonary Aspergillosis/etiology ; Pulmonary Aspergillosis/mortality ; Respiration, Artificial ; Respiratory Insufficiency/etiology ; Respiratory Insufficiency/therapy ; SARS-CoV-2/genetics ; SARS-CoV-2/isolation & purification
    Language English
    Publishing date 2021-02-16
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 392487-7
    ISSN 1439-0507 ; 0933-7407
    ISSN (online) 1439-0507
    ISSN 0933-7407
    DOI 10.1111/myc.13254
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Vitamin K metabolism as the potential missing link between lung damage and thromboembolism in Coronavirus disease 2019

    Janssen, Rob / Visser, Margot P. J / Dofferhoff, Anton S. M / Vermeer, Cees / Janssens, Wim / Walk, Jona

    British journal of nutrition. 2021 July 28, v. 126, no. 2

    2021  

    Abstract: Coronavirus disease 2019 (Covid-19), caused by severe acute respiratory syndrome coronavirus (SARS-CoV)-2, exerts far-reaching effects on public health and socio-economic welfare. The majority of infected individuals have mild to moderate symptoms, but a ...

    Abstract Coronavirus disease 2019 (Covid-19), caused by severe acute respiratory syndrome coronavirus (SARS-CoV)-2, exerts far-reaching effects on public health and socio-economic welfare. The majority of infected individuals have mild to moderate symptoms, but a significant proportion develops respiratory failure due to pneumonia. Thrombosis is another frequent manifestation of Covid-19 that contributes to poor outcomes. Vitamin K plays a crucial role in the activation of both pro- and anticlotting factors in the liver and the activation of extrahepatically synthesised protein S which seems to be important in local thrombosis prevention. However, the role of vitamin K extends beyond coagulation. Matrix Gla protein (MGP) is a vitamin K-dependent inhibitor of soft tissue calcification and elastic fibre degradation. Severe extrahepatic vitamin K insufficiency was recently demonstrated in Covid-19 patients, with high inactive MGP levels correlating with elastic fibre degradation rates. This suggests that insufficient vitamin K-dependent MGP activation leaves elastic fibres unprotected against SARS-CoV-2-induced proteolysis. In contrast to MGP, Covid-19 patients have normal levels of activated factor II, in line with previous observations that vitamin K is preferentially transported to the liver for activation of procoagulant factors. We therefore expect that vitamin K-dependent endothelial protein S activation is also compromised, which would be compatible with enhanced thrombogenicity. Taking these data together, we propose a mechanism of pneumonia-induced vitamin K depletion, leading to a decrease in activated MGP and protein S, aggravating pulmonary damage and coagulopathy, respectively. Intervention trials should be conducted to assess whether vitamin K administration plays a role in the prevention and treatment of severe Covid-19.
    Keywords COVID-19 infection ; Severe acute respiratory syndrome coronavirus ; calcification ; coagulation ; liver ; lungs ; metabolism ; pneumonia ; proteolysis ; public health ; socioeconomics ; thrombosis ; tissues ; vitamin K
    Language English
    Dates of publication 2021-0728
    Size p. 191-198.
    Publishing place Cambridge University Press
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 280396-3
    ISSN 1475-2662 ; 0007-1145
    ISSN (online) 1475-2662
    ISSN 0007-1145
    DOI 10.1017/S0007114520003979
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Vitamin K metabolism as the potential missing link between lung damage and thromboembolism in Coronavirus disease 2019.

    Janssen, Rob / Visser, Margot P J / Dofferhoff, Anton S M / Vermeer, Cees / Janssens, Wim / Walk, Jona

    The British journal of nutrition

    2020  Volume 126, Issue 2, Page(s) 191–198

    Abstract: Coronavirus disease 2019 (Covid-19), caused by severe acute respiratory syndrome coronavirus (SARS-CoV)-2, exerts far-reaching effects on public health and socio-economic welfare. The majority of infected individuals have mild to moderate symptoms, but a ...

    Abstract Coronavirus disease 2019 (Covid-19), caused by severe acute respiratory syndrome coronavirus (SARS-CoV)-2, exerts far-reaching effects on public health and socio-economic welfare. The majority of infected individuals have mild to moderate symptoms, but a significant proportion develops respiratory failure due to pneumonia. Thrombosis is another frequent manifestation of Covid-19 that contributes to poor outcomes. Vitamin K plays a crucial role in the activation of both pro- and anticlotting factors in the liver and the activation of extrahepatically synthesised protein S which seems to be important in local thrombosis prevention. However, the role of vitamin K extends beyond coagulation. Matrix Gla protein (MGP) is a vitamin K-dependent inhibitor of soft tissue calcification and elastic fibre degradation. Severe extrahepatic vitamin K insufficiency was recently demonstrated in Covid-19 patients, with high inactive MGP levels correlating with elastic fibre degradation rates. This suggests that insufficient vitamin K-dependent MGP activation leaves elastic fibres unprotected against SARS-CoV-2-induced proteolysis. In contrast to MGP, Covid-19 patients have normal levels of activated factor II, in line with previous observations that vitamin K is preferentially transported to the liver for activation of procoagulant factors. We therefore expect that vitamin K-dependent endothelial protein S activation is also compromised, which would be compatible with enhanced thrombogenicity. Taking these data together, we propose a mechanism of pneumonia-induced vitamin K depletion, leading to a decrease in activated MGP and protein S, aggravating pulmonary damage and coagulopathy, respectively. Intervention trials should be conducted to assess whether vitamin K administration plays a role in the prevention and treatment of severe Covid-19.
    MeSH term(s) COVID-19/complications ; COVID-19/pathology ; Calcium-Binding Proteins/metabolism ; Extracellular Matrix Proteins/metabolism ; Humans ; Lung/physiopathology ; Protein S/metabolism ; SARS-CoV-2 ; Thromboembolism/etiology ; Thromboembolism/prevention & control ; Thrombosis/etiology ; Thrombosis/prevention & control ; Vitamin K/antagonists & inhibitors ; Vitamin K/metabolism ; Vitamin K Deficiency/etiology ; Vitamin K Deficiency/metabolism ; Matrix Gla Protein
    Chemical Substances Calcium-Binding Proteins ; Extracellular Matrix Proteins ; Protein S ; Vitamin K (12001-79-5)
    Keywords covid19
    Language English
    Publishing date 2020-10-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 280396-3
    ISSN 1475-2662 ; 0007-1145
    ISSN (online) 1475-2662
    ISSN 0007-1145
    DOI 10.1017/S0007114520003979
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Azole-Resistant COVID-19-Associated Pulmonary Aspergillosis in an Immunocompetent Host: A Case Report.

    Meijer, Eelco F J / Dofferhoff, Anton S M / Hoiting, Oscar / Buil, Jochem B / Meis, Jacques F

    Journal of fungi (Basel, Switzerland)

    2020  Volume 6, Issue 2

    Abstract: COVID-19-associated pulmonary aspergillosis (CAPA) is a recently described disease entity affecting patients with severe pulmonary abnormalities treated in intensive care units. Delays in diagnosis contribute to a delayed start of antifungal therapy. In ... ...

    Abstract COVID-19-associated pulmonary aspergillosis (CAPA) is a recently described disease entity affecting patients with severe pulmonary abnormalities treated in intensive care units. Delays in diagnosis contribute to a delayed start of antifungal therapy. In addition, the emergence of resistance to triazole antifungal agents puts emphasis on early surveillance for azole-resistant
    Keywords covid19
    Language English
    Publishing date 2020-06-06
    Publishing country Switzerland
    Document type Case Reports
    ZDB-ID 2784229-0
    ISSN 2309-608X ; 2309-608X
    ISSN (online) 2309-608X
    ISSN 2309-608X
    DOI 10.3390/jof6020079
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Effects of Vitamin D and K on Interleukin-6 in COVID-19.

    Visser, Margot P J / Dofferhoff, Anton S M / van den Ouweland, Jody M W / van Daal, Henny / Kramers, Cornelis / Schurgers, Leon J / Janssen, Rob / Walk, Jona

    Frontiers in nutrition

    2022  Volume 8, Page(s) 761191

    Abstract: Background: Pathology during COVID-19 infection arises partly from an excessive inflammatory response with a key role for interleukin (IL)-6. Both vitamin D and K have been proposed as potential modulators of this process.: Methods: We assessed ... ...

    Abstract Background: Pathology during COVID-19 infection arises partly from an excessive inflammatory response with a key role for interleukin (IL)-6. Both vitamin D and K have been proposed as potential modulators of this process.
    Methods: We assessed vitamin D and K status by measuring circulating 25-hydroxyvitamin D (25(OH)D) and desphospho-uncarboxylated Matrix Gla-Protein (dp-ucMGP), respectively in 135 hospitalized COVID-19 patients in relation to inflammatory response, elastic fiber degradation and clinical outcomes.
    Results: Comparing good and poor disease outcomes of COVID-19 patients, vitamin 25(OH)D levels were not significantly different. IL-6 levels, however, were significantly higher in patients with poor outcome, compared to patients with good outcome (30.3 vs. 153.0 pg/mL;
    Conclusions: Dp-ucMGP associates with IL-6 as a central component of the destructive inflammatory processes in COVID-19. An intervention trial may provide insight whether vitamin K administration, either or not in combination with vitamin D, improves clinical outcome of COVID-19.
    Language English
    Publishing date 2022-01-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2776676-7
    ISSN 2296-861X
    ISSN 2296-861X
    DOI 10.3389/fnut.2021.761191
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Corrigendum: Effects of Vitamin D and K on Interleukin-6 in COVID-19.

    Visser, Margot P J / Dofferhoff, Anton S M / van den Ouweland, Jody M W / van Daal, Henny / Kramers, Cornelis / Schurgers, Leon J / Janssen, Rob / Walk, Jona

    Frontiers in nutrition

    2022  Volume 9, Page(s) 868324

    Abstract: This corrects the article DOI: 10.3389/fnut.2021.761191.]. ...

    Abstract [This corrects the article DOI: 10.3389/fnut.2021.761191.].
    Language English
    Publishing date 2022-03-08
    Publishing country Switzerland
    Document type Published Erratum
    ZDB-ID 2776676-7
    ISSN 2296-861X
    ISSN 2296-861X
    DOI 10.3389/fnut.2022.868324
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Vitamin K metabolism as the potential missing link between lung damage and thromboembolism in Coronavirus disease 2019

    Janssen, Rob / Visser, Margot P. J. / Dofferhoff, Anton S. M. / Vermeer, Cees / Janssens, Wim / Walk, Jona

    British Journal of Nutrition

    2020  , Page(s) 1–8

    Abstract: Abstract Coronavirus disease 2019 (Covid-19), caused by severe acute respiratory syndrome coronavirus (SARS-CoV)-2, exerts far-reaching effects on public health and socio-economic welfare. The majority of infected individuals have mild to moderate ... ...

    Abstract Abstract Coronavirus disease 2019 (Covid-19), caused by severe acute respiratory syndrome coronavirus (SARS-CoV)-2, exerts far-reaching effects on public health and socio-economic welfare. The majority of infected individuals have mild to moderate symptoms, but a significant proportion develops respiratory failure due to pneumonia. Thrombosis is another frequent manifestation of Covid-19 that contributes to poor outcomes. Vitamin K plays a crucial role in the activation of both pro- and anticlotting factors in the liver and the activation of extrahepatically synthesised protein S which seems to be important in local thrombosis prevention. However, the role of vitamin K extends beyond coagulation. Matrix Gla protein (MGP) is a vitamin K-dependent inhibitor of soft tissue calcification and elastic fibre degradation. Severe extrahepatic vitamin K insufficiency was recently demonstrated in Covid-19 patients, with high inactive MGP levels correlating with elastic fibre degradation rates. This suggests that insufficient vitamin K-dependent MGP activation leaves elastic fibres unprotected against SARS-CoV-2-induced proteolysis. In contrast to MGP, Covid-19 patients have normal levels of activated factor II, in line with previous observations that vitamin K is preferentially transported to the liver for activation of procoagulant factors. We therefore expect that vitamin K-dependent endothelial protein S activation is also compromised, which would be compatible with enhanced thrombogenicity. Taking these data together, we propose a mechanism of pneumonia-induced vitamin K depletion, leading to a decrease in activated MGP and protein S, aggravating pulmonary damage and coagulopathy, respectively. Intervention trials should be conducted to assess whether vitamin K administration plays a role in the prevention and treatment of severe Covid-19.
    Keywords Nutrition and Dietetics ; Medicine (miscellaneous) ; covid19
    Language English
    Publisher Cambridge University Press (CUP)
    Publishing country uk
    Document type Article ; Online
    ZDB-ID 280396-3
    ISSN 1475-2662 ; 0007-1145
    ISSN (online) 1475-2662
    ISSN 0007-1145
    DOI 10.1017/s0007114520003979
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Few bacterial co-infections but frequent empiric antibiotic use in the early phase of hospitalized patients with COVID-19: results from a multicentre retrospective cohort study in The Netherlands.

    Karami, Zara / Knoop, Bram T / Dofferhoff, Anton S M / Blaauw, Marc J T / Janssen, Nico A / van Apeldoorn, Marjan / Kerckhoffs, Angèle P M / van de Maat, Josephine S / Hoogerwerf, Jacobien J / Ten Oever, Jaap

    Infectious diseases (London, England)

    2020  Volume 53, Issue 2, Page(s) 102–110

    Abstract: Background: Knowledge on bacterial co-infections in COVID-19 is crucial to use antibiotics appropriately. Therefore, we aimed to determine the incidence of bacterial co-infections, antibiotic use and application of antimicrobial stewardship principles ... ...

    Abstract Background: Knowledge on bacterial co-infections in COVID-19 is crucial to use antibiotics appropriately. Therefore, we aimed to determine the incidence of bacterial co-infections, antibiotic use and application of antimicrobial stewardship principles in hospitalized patients with COVID-19.
    Methods: We performed a retrospective observational study in four hospitals (1 university, 2 non-university teaching, 1 non-teaching hospital) in the Netherlands from March to May 2020 including consecutive patients with PCR-confirmed COVID-19. Data on first microbiological investigations obtained at the discretion of the physician and antibiotic use in the first week of hospital admission were collected.
    Results: Twelve (1.2%) of the 925 patients included had a documented bacterial co-infection (75.0% pneumonia) within the first week. Microbiological testing was performed in 749 (81%) patients: sputum cultures in 105 (11.4%), blood cultures in 711 (76.9%), pneumococcal urinary antigen testing in 202 (21.8%), and
    Conclusions: On presentation to the hospital bacterial co-infections are rare, while empiric antibiotic use is abundant. This implies that in patients with COVID-19 empiric antibiotic should be withheld. This has the potential to dramatically reduce the current overuse of antibiotics in the COVID-19 pandemic.
    MeSH term(s) Aged ; Anti-Bacterial Agents/administration & dosage ; Antimicrobial Stewardship ; Bacterial Infections/drug therapy ; Bacterial Infections/epidemiology ; Bacterial Infections/microbiology ; Blood Culture ; COVID-19/epidemiology ; COVID-19/virology ; Coinfection ; Drug Administration Routes ; Drug Administration Schedule ; Female ; Guideline Adherence/statistics & numerical data ; Hospitalization ; Humans ; Incidence ; Male ; Middle Aged ; Netherlands/epidemiology ; Pandemics ; Prescription Drug Overuse/prevention & control ; Prescription Drug Overuse/statistics & numerical data ; Retrospective Studies ; SARS-CoV-2/pathogenicity
    Chemical Substances Anti-Bacterial Agents
    Keywords covid19
    Language English
    Publishing date 2020-10-24
    Publishing country England
    Document type Journal Article ; Multicenter Study ; Observational Study
    ZDB-ID 2839775-7
    ISSN 2374-4243 ; 2374-4235
    ISSN (online) 2374-4243
    ISSN 2374-4235
    DOI 10.1080/23744235.2020.1839672
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Prior use of therapeutic anticoagulation does not protect against COVID-19 related clinical outcomes in hospitalized patients: A propensity score-matched cohort study.

    Spiegelenberg, Janneke P / van Gelder, Marleen M H J / Maas, Martje L / Hovens, Marcel M C / Esselink, Anne / Dofferhoff, Anton S M / Janssen, Rob / van de Maat, Josephine / Janssen, Nico / Blaauw, Marc / Hassing, Robert-Jan / van Apeldoorn, Marjan / Kerckhoffs, Angèle / Veerman, Karin / Hoogerwerf, Jacobien / Kramers, Cornelis / Leentjens, Jenneke

    British journal of clinical pharmacology

    2021  Volume 87, Issue 12, Page(s) 4839–4847

    Abstract: The hypercoagulable state observed in COVID-19 could be responsible for morbidity and mortality. In this retrospective study we investigated whether therapeutic anticoagulation prior to infection has a beneficial effect in hospitalized COVID-19 patients. ...

    Abstract The hypercoagulable state observed in COVID-19 could be responsible for morbidity and mortality. In this retrospective study we investigated whether therapeutic anticoagulation prior to infection has a beneficial effect in hospitalized COVID-19 patients. This study included 1154 COVID-19 patients admitted to 6 hospitals in the Netherlands between March and May 2020. We applied 1:3 propensity score matching to evaluate the association between prior therapeutic anticoagulation use and clinical outcome, with in hospital mortality as primary endpoint. In total, 190 (16%) patients used therapeutic anticoagulation prior to admission. In the propensity score matched analyses, we observed no associations between prior use of therapeutic anticoagulation and overall mortality (risk ratio 1.02 [95% confidence interval; 0.80-1.30]) or length of hospital stay (7.0 [4-12] vs. 7.0 [4-12] days, P = .69), although we observed a lower risk of pulmonary embolism (0.19 [0.05-0.80]). This study shows that prior use of therapeutic anticoagulation is not associated with improved clinical outcome in hospitalized COVID-19 patients.
    MeSH term(s) Anticoagulants ; COVID-19 ; Cohort Studies ; Humans ; Propensity Score ; Retrospective Studies ; SARS-CoV-2
    Chemical Substances Anticoagulants
    Language English
    Publishing date 2021-05-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 188974-6
    ISSN 1365-2125 ; 0306-5251 ; 0264-3774
    ISSN (online) 1365-2125
    ISSN 0306-5251 ; 0264-3774
    DOI 10.1111/bcp.14877
    Database MEDical Literature Analysis and Retrieval System OnLINE

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