Maertens Johan

Dr. Maertens Johan

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Research Focus & Metrics

Academic Career Length

27Years (2000-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 November 2005 in Clinical Infectious Diseases
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Journal Article
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MJMaertens Johan
Maertens Johan
KTKoen Theunissen
Koen Theunissen
GVGregor Verhoef
Gregor Verhoef
JVJohnny Verschakelen
Johnny Verschakelen
KLKatrien Lagrou
Katrien Lagrou
JEJ. V. Eldere
J. V. Eldere
Background. Empirical antifungal therapy is the standard treatment for persistent or relapsing antibiotic-resistant neutropenic fever. However, overt

22 June 2020 in Intensive Care Medicine
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Journal Article
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PVPaul Verweij
Paul Verweij
BRBart Rijnders
Bart Rijnders
RBRoger J. M. Brüggemann
Roger J. M. Brüggemann
EAElie Azoulay
Elie Azoulay
MBMatteo Bassetti
Matteo Bassetti
FVFrank van de Veerdonk
Frank van de Veerdonk
Purpose Invasive pulmonary aspergillosis is increasingly reported in patients with influenza admitted to the intensive care unit (ICU). Classification of patients with influenza-associated pulmonary aspergillosis (IAPA) using the current definitions for invasive fungal diseases has proven difficult, and our aim was to develop case definitions for IAPA that can facilitate clinical studies. Methods A group of 29 international experts reviewed current insights into the epidemiology, diagnosis and management of IAPA and proposed a case definition of IAPA through a process of informal consensus. Results Since IAPA may develop in a wide range of hosts, an entry criterion was proposed and not host factors. The entry criterion was defined as a patient requiring ICU admission for respiratory distress with a positive influenza test temporally related to ICU admission. In addition, proven IAPA required histological evidence of invasive septate hyphae and mycological evidence for Aspergillus. Probable IAPA required the detection of galactomannan or positive Aspergillus culture in bronchoalveolar lavage (BAL) or serum with pulmonary infiltrates or a positive culture in upper respiratory samples with bronchoscopic evidence for tracheobronchitis or cavitating pulmonary infiltrates of recent onset. The IAPA case definitions may be useful to classify patients with COVID-19-associated pulmonary aspergillosis (CAPA), while awaiting further studies that provide more insight into the interaction between Aspergillus and the SARS-CoV-2-infected lung. Conclusion A consensus case definition of IAPA is proposed, which will facilitate research into the epidemiology, diagnosis and management of this emerging acute and severe Aspergillus disease, and may be of use to study CAPA.

1 January 2004 in Clinical Microbiology and Infection
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MJMaertens Johan
Maertens Johan

14 October 2021 in Journal of Hematology & Oncology
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Livio PaganoLivio Pagano
Livio Pagano
JSJon Salmanton-García
Jon Salmanton-García
FMFrancesco Marchesi
Francesco Marchesi
Alessandro BuscaAlessandro Busca
Alessandro Busca
PCPaolo Corradini
Paolo Corradini
NANatasha Ali
Natasha Ali
Background: Patients with hematological malignancies (HM) are at high risk of mortality from SARS-CoV-2 disease 2019 (COVID-19). A better understanding of risk factors for adverse outcomes may improve clinical management in these patients. We therefore studied baseline characteristics of HM patients developing COVID-19 and analyzed predictors of mortality. Methods: The survey was supported by the Scientific Working Group Infection in Hematology of the European Hematology Association (EHA). Eligible for the analysis were adult patients with HM and laboratory-confirmed COVID-19 observed between March and December 2020. Results: The study sample includes 3801 cases, represented by lymphoproliferative (mainly non-Hodgkin lymphoma n = 1084, myeloma n = 684 and chronic lymphoid leukemia n = 474) and myeloproliferative malignancies (mainly acute myeloid leukemia n = 497 and myelodysplastic syndromes n = 279). Severe/critical COVID-19 was observed in 63.8% of patients (n = 2425). Overall, 2778 (73.1%) of the patients were hospitalized, 689 (18.1%) of whom were admitted to intensive care units (ICUs). Overall, 1185 patients (31.2%) died. The primary cause of death was COVID-19 in 688 patients (58.1%), HM in 173 patients (14.6%), and a combination of both COVID-19 and progressing HM in 155 patients (13.1%). Highest mortality was observed in acute myeloid leukemia (199/497, 40%) and myelodysplastic syndromes (118/279, 42.3%). The mortality rate significantly decreased between the first COVID-19 wave (March–May 2020) and the second wave (October–December 2020) (581/1427, 40.7% vs. 439/1773, 24.8%, p value < 0.0001). In the multivariable analysis, age, active malignancy, chronic cardiac disease, liver disease, renal impairment, smoking history, and ICU stay correlated with mortality. Acute myeloid leukemia was a higher mortality risk than lymphoproliferative diseases. Conclusions: This survey confirms that COVID-19 patients with HM are at high risk of lethal complications. However, improved COVID-19 prevention has reduced mortality despite an increase in the number of reported cases.

1 February 2021 in The Lancet
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MJMaertens Johan
Maertens Johan
GRGalia Rahav
Galia Rahav
DLDong-Gun Lee
Dong-Gun Lee
APAlfredo Ponce-De-León
Alfredo Ponce-De-León
ISIsabel Cristina Ramírez Sánchez
Isabel Cristina Ramírez Sánchez
HWHetty Waskin
Hetty Waskin

1 November 2002 in The Journal of Infectious Diseases
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Journal Article
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MJMaertens Johan
Maertens Johan
JEJohan Van Eldere
Johan Van Eldere
JVJan Verhaegen
Jan Verhaegen
EVErik Verbeken
Erik Verbeken
JVJohny Verschakelen
Johny Verschakelen
MBMarc Boogaerts
Marc Boogaerts
Screening for galactomannan (GM) has been adopted by many European centers as part of the management plan for allogeneic stem cell transplant recipie