Johannes Marco Schnater

Dr. Johannes Marco Schnater

orcid

Research Focus & Metrics

Academic Career Length

22Years (2005-Present)

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

Representative Publications

View All Publications
2 November 2023 in Nature Reviews Disease Primers
Verified
Journal Article
Closed access
PDF file
FPFederica Pederiva
Federica Pederiva
SRSteven S. Rothenberg
Steven S. Rothenberg
NHNigel Hall
Nigel Hall
HIHanneke Ijsselstijn
Hanneke Ijsselstijn
KWKenneth K. Y. Wong
Kenneth K. Y. Wong
JSJohannes Marco Schnater
Johannes Marco Schnater

22 April 2019 in Pediatric Pulmonology
Verified
Journal Article
Open access
PDF file
AHAnnelieke Hijkoop
Annelieke Hijkoop
MSMarloes M. van Schoonhoven
Marloes M. van Schoonhoven
JRJoost van Rosmalen
Joost van Rosmalen
Dick TibboelDick Tibboel
Dick Tibboel
MZMonique H. M. van der Cammen‐Van Zijp
Monique H. M. van der Cammen‐Van Zijp
HIHanneke IJsselstijn
Hanneke IJsselstijn
Objective: To improve counseling on congenital lung malformations (CLM) by describing long‐term outcomes of children either operated on or managed by observation.Study design: We analyzed lung function (spirometry), exercise tolerance (Bruce treadmill), and physical growth of 8‐year‐old children with CLM who participated in our longitudinal prospective follow‐up program. The data are shown as median standard deviation scores (SDS) with IQR, or estimated marginal means (95% CI) on the basis of general linear models.Results: Twenty‐nine (48%) of the 61 children had required surgery at a median age of 108 (IQR: 8‐828) days, and 32 (52%) were managed by observation. In the surgery group, all lung function measurements (except for forced vital capacity [FVC]) were significantly below 0 SDS, with median FEV1 −1.07 (IQR: −1.70 to −0.56), FEV1/FVC −1.49 (−2.62 to −0.33), and FEF25%‐75% −1.95 (−2.57 to −0.63) (all P < 0.001). Children in the observation group had normal FEV1 and FVC, whereas FEV1/FVC (−0.81 (−1.65 to −0.14)) and FEF25%‐75% (−1.14 (−1.71 to −0.22)) were significantly below 0 SDS (both P < 0.001). Mean exercise tolerance was significantly below 0 SDS in both groups (observation: −0.85 (95% CI: −1.30 to −0.41); surgery: −1.25 (−1.69 to −0.80)); eight (28%) children in the observation group and ten (40%) in the surgery group scored <−1 SDS. Physical growth was normal in both groups.Conclusion: Children with CLM may be at risk for reduced lung function and exercise tolerance, especially those who required surgery. As little pulmonary morbidity was found in children with asymptomatic CLM, this study supports a watchful waiting approach in this group.

17 March 2023 in BMJ Open
Verified
Journal Article
Open access
PDF file
CKCasper Kersten
Casper Kersten
SHSergei M Hermelijn
Sergei M Hermelijn
LDLouis W J Dossche
Louis W J Dossche
NMNagarajan Muthialu
Nagarajan Muthialu
PLPaul D Losty
Paul D Losty
JSJohannes Marco Schnater
Johannes Marco Schnater
Introduction Consensus is lacking on the optimal management of asymptomatic congenital pulmonary airway malformation (CPAM). For future studies, the CONNECT consortium (the COllaborative Neonatal Network for the first European CPAM Trial)—an international collaboration of specialised caregivers—has established consensus on a core outcome set of outcome parameters concerning respiratory insufficiency, surgical complications, mass effect and multifocal disease. These outcome parameters have been incorporated in the CONNECT trial, a randomised controlled trial which, in order to develop evidence-based practice, aims to compare conservative and surgical management of patients with an asymptomatic CPAM. Methods and analysis Children are eligible for inclusion after the CPAM diagnosis has been confirmed on postnatal chest CT scan and they remain asymptomatic. On inclusion, children are randomised to receive either conservative or surgical management. Subsequently, children in both groups are enrolled into a standardised, 5-year follow-up programme with three visits, including a repeat chest CT scan at 2.5 years and a standardised exercise tolerance test at 5 years. The primary outcome is exercise tolerance at age 5 years, measured according to the Bruce treadmill protocol. Secondary outcome measures are molecular genetic diagnostics, validated questionnaires—on parental anxiety, quality of life and healthcare consumption—, repeated imaging and pulmonary morbidity during follow-up, as well as surgical complications and histopathology. This trial aims to end the continuous debate surrounding the optimal management of asymptomatic CPAM. Ethics and dissemination This study is being conducted in accordance with the Declaration of Helsinki. The Medical Ethics Review Board of Erasmus University Medical Centre Rotterdam, The Netherlands, has approved this protocol (MEC-2022–0441). Results will be disseminated through peer-reviewed scientific journals and conference presentations. Trial registration number NCT05701514.

1 November 2019 in Journal of Pediatric Gastroenterology and Nutrition
Verified
Journal Article
Open access
FVFloor W.T. Vergouwe
Floor W.T. Vergouwe
MWMichiel P. van Wijk
Michiel P. van Wijk
MSManon C.W. Spaander
Manon C.W. Spaander
Marco BrunoMarco Bruno
Marco Bruno
RWRene Wijnen
Rene Wijnen
HIHanneke IJsselstijn
Hanneke IJsselstijn
Objectives: The aim of the study was to evaluate acid and nonacid gastroesophageal reflux in infants and school‐aged children with esophageal atresia (EA) using pH‐impedance (pH‐MII) monitoring.Methods: Between 2012 and 2017, all 24‐hour pH‐MII studies performed in infants (⩽18 months) and 8‐year olds with EA were included. Antiacid therapy was discontinued before study. Exclusion criteria were: isolated tracheoesophageal fistula; esophageal replacement therapy; tube feeding; and monitoring <18 hours. Automatically detected retrograde bolus movements (RBM) were manually reviewed and modified/deleted if necessary.Results: We included 57 children (51% boys; 2% isolated EA; 44% thoracoscopic EA repair): 24 infants (median age 0.6 years) and 33 school‐aged children (median age 8.2 years). Of the automatically detected 3313 RBM, 1292 were manually deleted from the tracings: 52% of nonacid RBM and 8% of acid RBM (mainly misinterpreted swallows or 1 event recognized as several events). In infants, median reflux index (RI; pH <4) was 2.6% (abnormal in n = 2), median RBM was 61 (62% nonacid, 58% mixed), and median of the mean BCT was 11 seconds. In older children, median RI was 0.3% (abnormal in n = 4), median RBM was 21 (64% nonacid; 75% mixed), and median of the mean BCT was 13 seconds.Conclusions: Most children with EA off medication have a normal RI, yet experience a significant number of nonacid RBM. After manual revision of the tracings, a high percentage of RBM was deleted. Our data show that automated impedance analysis software needs refinement for use in infants and children with EA and question the need for standard antiacid therapy in these patients.

1 December 2021 in Journal of Pediatric Surgery
Verified
Journal Article
Open access
RBRyan J. Billar
Ryan J. Billar
WMWiem Manoubi
Wiem Manoubi
SKSarina G. Kant
Sarina G. Kant
RWRené M.H. Wijnen
René M.H. Wijnen
SDSerwet Demirdas
Serwet Demirdas
JSJohannes Marco Schnater
Johannes Marco Schnater
Background: Pectus excavatum (PE) could be part of a genetic disorder, which then has implications regarding comorbidity, the surgical correction of PE, and reproductive choices. However, referral of a patient presenting with PE for genetic analysis is often delayed because additional crucial clinical signs may be subtle or even missed in syndromic patients. We reviewed the literature to inventory known genetic disorders associated with PE and create a standardized protocol for clinical evaluation. Methods: A systematic literature search was performed in electronic databases. Genetic disorders were considered associated with PE if studies reported at least five cases with PE. Characteristics of each genetic disorder were extracted from the literature and the OMIM database in order to create a practical guide for the clinician. Results: After removal of duplicates from the initial search, 1632 citations remained. Eventually, we included 119 full text articles, representing 20 different genetic disorders. Relevant characteristics and important clinical signs of each genetic disorder were summarized providing a standardized protocol in the form of a scoring list. The most important clinical sign was a positive family history for PE and/or congenital heart defect. Conclusions: Twenty unique genetic disorders have been found associated with PE. We have created a scoring list for the clinician that systematically evaluates crucial clinical signs, thereby facilitating decision making for referral to a clinical geneticist. (c) 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)

25 August 2020 in Neonatology
Verified
Journal Article
Open access
PDF file
SHSergei M. Hermelijn
Sergei M. Hermelijn
RZRutger R. Zwartjes
Rutger R. Zwartjes
HTHarm A.W.M. Tiddens
Harm A.W.M. Tiddens
SOSuzan C.M. Cochius-Den Otter
Suzan C.M. Cochius-Den Otter
IRIrwin K.M. Reiss
Irwin K.M. Reiss
JSJohannes Marco Schnater
Johannes Marco Schnater
Introduction: A congenital lung abnormality (CLA) is often found in conjunction with other abnormalities but screening guidelines for newborns with CLA have not yet been reported. We aimed to assess the incidence of associated anomalies in CLA patients born or followed up at our centre and the need for additional screening of newborns with a CLA. Methods: From a retrospective chart review of all patients born with a CLA between January 1999 and January 2019, we identified patients diagnosed with a congenital pulmonary airway malformation, bronchopulmonary sequestration, congenital lobar overinflation, bronchogenic cyst, or lung agenesis. Associated anomalies were noted and categorized according to the affected organ system. Results: Twenty-eight (14%) of 196 CLA patients had a major associated anomaly. This was most frequent in conjunction with a lung agenesis (100%) or bronchogenic cyst (29%). Congenital heart defects (32%) and gastrointestinal defects (18%) were the most frequently associated anomalies. Examination of newborns with a CLA should focus on the cardiovascular and gastrointestinal tract, and a chest and abdominal radiograph may be useful to assess signs of major associated anomalies, regardless of the clinical course.