1
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Heesterbeek MR, Luijten MAJ, Gouw SC, Limperg PF, Fijnvandraat K, Coppens M, Kruip MJHA, Eikenboom J, Grootenhuis MA, Flens G, Terwee CB, Peters M, Haverman L. Measuring anxiety and depression in young adult men with haemophilia using PROMIS. Haemophilia 2022; 28:e79-e82. [PMID: 35305286 DOI: 10.1111/hae.14534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 02/23/2022] [Accepted: 02/23/2022] [Indexed: 11/30/2022]
Affiliation(s)
- M R Heesterbeek
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Child and Adolescent Psychiatry and Psychosocial Care, Amsterdam Reproduction and Development, Amsterdam Public Health, Amsterdam, The Netherlands
| | - M A J Luijten
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Child and Adolescent Psychiatry and Psychosocial Care, Amsterdam Reproduction and Development, Amsterdam Public Health, Amsterdam, The Netherlands.,Amsterdam UMC, Epidemiology and Data Science, Vrije Universiteit, Amsterdam, The Netherlands
| | - S C Gouw
- Emma Children's Hospital, Amsterdam UMC, Paediatric Haematology, University of Amsterdam, Amsterdam, The Netherlands.,Department of Clinical Epidemiology, Leiden University Medical Centre, Leiden, The Netherlands
| | - P F Limperg
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Child and Adolescent Psychiatry and Psychosocial Care, Amsterdam Reproduction and Development, Amsterdam Public Health, Amsterdam, The Netherlands
| | - K Fijnvandraat
- Emma Children's Hospital, Amsterdam UMC, Paediatric Haematology, University of Amsterdam, Amsterdam, The Netherlands
| | - M Coppens
- Department of Vascular Medicine, Amsterdam Cardiovascular Sciences, Amsterdam University Medical Centres, University of Amsterdam, Amsterdam, the Netherlands
| | - M J H A Kruip
- Erasmus MC, Department of Haematology Rotterdam, Erasmus University Medical Centre, The Netherlands
| | - J Eikenboom
- Department of Internal Medicine, Division of Thrombosis and Haemostasis, Leiden University Medical Centre, Leiden, The Netherlands
| | - M A Grootenhuis
- Princess Máxima Centre for Paediatric Oncology, Utrecht, The Netherlands
| | - G Flens
- Alliance for Quality in Mental Health Care, Utrecht, The Netherlands
| | - C B Terwee
- Emma Children's Hospital, Amsterdam UMC, Paediatric Haematology, University of Amsterdam, Amsterdam, The Netherlands
| | - M Peters
- Amsterdam UMC, Epidemiology and Data Science, Vrije Universiteit, Amsterdam, The Netherlands
| | - L Haverman
- Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Child and Adolescent Psychiatry and Psychosocial Care, Amsterdam Reproduction and Development, Amsterdam Public Health, Amsterdam, The Netherlands
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2
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Abdi A, Bordbar MR, Hassan S, Rosendaal FR, van der Bom JG, Voorberg J, Fijnvandraat K, Gouw SC. Prevalence and Incidence of Non-neutralizing Antibodies in Congenital Hemophilia A- A Systematic Review and Meta-Analysis. Front Immunol 2020; 11:563. [PMID: 32457734 PMCID: PMC7221178 DOI: 10.3389/fimmu.2020.00563] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 03/12/2020] [Indexed: 12/21/2022] Open
Abstract
Objectives: In hemophilia A the presence of non-neutralizing antibodies (NNAs) against Factor VIII (FVIII) may predict the development of neutralizing antibodies (inhibitors) and accelerate the clearance of administrated FVIII concentrates. This systematic review aimed to assess: (1) the prevalence and incidence of NNAs in patients with congenital hemophilia without inhibitors and (2) the association between NNAs and patient and treatment characteristics. Methods: We conducted a search in MEDLINE, Embase, Web of Science and the Cochrane database. We included cross-sectional and longitudinal studies reporting on NNAs in patients with hemophilia A and B, who were inhibitor-negative at the start of the observation period. Data were extracted on: hemophilia type and severity, patient and treatment characteristics, NNA prevalence and incidence, NNA assays and inhibitor development. Two independent reviewers performed study selection, data extraction and risk of bias assessment, using adapted criteria of the Joanna Briggs Institute. Studies were classified as high-quality when ≥5/9 criteria were met. NNA assays were classified as high-quality when both quality criteria were met: (1) use of positive controls and (2) competition with FVIII to establish FVIII-specificity. We reported NNA prevalence and incidence for each study. The pooled NNA prevalence was assessed for well-designed studies in previously treated patients, employing high-quality NNA assays. Results: We included data from 2,723 inhibitor-negative patients with hemophilia A, derived from 28 studies. Most studies were cross-sectional (19/28) and none reported on NNAs in hemophilia B. Study design was of high quality in 16/28 studies and the NNA assay quality was high in 9/28 studies. Various NNA assays were used, predominantly ELISA (18/28) with different cut-off values. We found a large variety in NNA prevalence (Range, 0–100%). The pooled NNA prevalence in high-quality studies was 25% (95% CI, 16–38%). The incidence of new NNA development was reported in one study (0.01 NNA per person-exposure day). Conclusion: This systematic review identified studies that were heterogeneous in study design, patient population and NNA assay type, with NNA prevalence ranging from 0 to 100% in inhibitor-negative patients with hemophilia A. The pooled NNA prevalence was 25% in high-quality studies including only previously treated patients and performing high-quality NNA assays.
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Affiliation(s)
- A Abdi
- Department of Pediatric Hematology, Amsterdam UMC, Emma Children's Hospital, University of Amsterdam, Amsterdam, Netherlands
| | - M R Bordbar
- Hematology Research Center, Nemazee Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
| | - S Hassan
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands
| | - F R Rosendaal
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands
| | - J G van der Bom
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands.,Center for Clinical Transfusion Research, Sanquin Research, Leiden, Netherlands
| | - J Voorberg
- Department of Molecular Cellular Hemostasis, Sanquin Research and Landsteiner Laboratory, Amsterdam, Netherlands.,Department of Experimental Vascular Medicine, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, Netherlands
| | - K Fijnvandraat
- Department of Pediatric Hematology, Amsterdam UMC, Emma Children's Hospital, University of Amsterdam, Amsterdam, Netherlands.,Department of Molecular Cellular Hemostasis, Sanquin Research and Landsteiner Laboratory, Amsterdam, Netherlands
| | - S C Gouw
- Department of Pediatric Hematology, Amsterdam UMC, Emma Children's Hospital, University of Amsterdam, Amsterdam, Netherlands.,Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands
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3
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van Balen EC, Gouw SC, Hazelzet JA, van der Bom JG, Cnossen MH. Defining patient value in haemophilia care. Haemophilia 2019; 24:516-518. [PMID: 30141573 DOI: 10.1111/hae.13550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/31/2018] [Indexed: 12/25/2022]
Affiliation(s)
- E C van Balen
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherland
| | - S C Gouw
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherland.,Department of Paediatric Haematology, Academic Medical Center Amsterdam, Amsterdam, the Netherland
| | - J A Hazelzet
- Department of Public Health, Erasmus Medical Center, Rotterdam, the Netherland
| | - J G van der Bom
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherland.,Center for Clinical Transfusion Research, Sanquin Research, Leiden, the Netherland
| | - M H Cnossen
- Department of Paediatric Haematology, Erasmus Medical Center - Sophia Children's hospital, Rotterdam, the Netherlands
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4
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Hassan S, Cannavò A, Gouw SC, Rosendaal FR, van der Bom JG. Factor VIII products and inhibitor development in previously treated patients with severe or moderately severe hemophilia A: a systematic review. J Thromb Haemost 2018; 16:1055-1068. [PMID: 29665204 DOI: 10.1111/jth.14124] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Indexed: 02/02/2023]
Abstract
Essentials Data on product-related immunogenicity in previously treated haemophilia A patients is scarce. A systematic review and meta-analysis of all currently available evidence was conducted. The overall incidence rate was 2.06 per 1000 person-years (95% confidence interval: 1.06-4.01). Some recombinant factor VIII products were associated with increased immunogenicity. SUMMARY Background Patients with severe hemophilia A who have been treated extensively with factor VIII products have a low but potentially serious risk of inhibitor development. It is unknown why these patients develop inhibitors, and data on product-related immunogenicity are scarce. Aims To summarize the currently available evidence on the relationship between inhibitor development and recombinant FVIII product type in previously treated patients (PTPs) with severe hemophilia A. Methods Longitudinal studies were included that reported on de novo inhibitor formation in patients with baseline FVIII activity levels of < 0.02 IU mL-1 who had been treated with FVIII for at least 50 days. Pooled incidence rates of inhibitor development according to product types were calculated with a random intercept Poisson regression model. Results Forty-one independent cohorts were included; 39 patients developed de novo inhibitors during 19 157 person-years of observation. The overall incidence rate was 2.06 per 1000 person-years, with a 95% confidence interval (CI) of 1.06-4.01. According to product type, the pooled incidence rates were 0.99 (95% CI 0.37-2.70) per 1000 person-years for patients treated with Advate, 5.86 (95% CI 0.25-134.92) per 1000 person-years for those treated with Kogenate/Helixate, 1.35 (95% CI 0.66-2.77) per 1000 person-years for those treated with Kogenate FS/Helixate NexGen, 12.05 (95% CI 1.53-94.78) per 1000 person-years for those treated with Refacto, and 4.64 (95% CI 0.82-26.43) per 1000 person-years for those treated with Refacto AF. Conclusion These results suggest that some products may be associated with increased immunogenicity. However, the low incidence of inhibitors in PTPs and the differences in study design may cause significant variation in estimates of risk.
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Affiliation(s)
- S Hassan
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - A Cannavò
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
- Angelo Bianchi Bonomi Hemophilia and Thrombosis Center, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico and Luigi Villa Foundation, Milan, Italy
| | - S C Gouw
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
- Department of Pediatric Hematology, Emma Children's Hospital, Academic Medical Center, Amsterdam, the Netherlands
| | - F R Rosendaal
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
| | - J G van der Bom
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
- Center for Clinical Transfusion Research, Sanquin Research, Leiden, the Netherlands
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5
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Zwagemaker A, Gouw SC, Valk C, Ganzevoort W, Coppens M, Peters M. Postpartum haemorrhage in an unselected cohort of carriers of haemophilia. Haemophilia 2018; 24:e256-e259. [DOI: 10.1111/hae.13521] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2018] [Indexed: 12/21/2022]
Affiliation(s)
- A. Zwagemaker
- Department of Paediatric Haematology; Academic Medical Center; Amsterdam the Netherlands
| | - S. C. Gouw
- Department of Paediatric Haematology; Academic Medical Center; Amsterdam the Netherlands
- Haemophilia Comprehensive Care Centre; Academic Medical Center; Amsterdam the Netherlands
| | - C. Valk
- Haemophilia Comprehensive Care Centre; Academic Medical Center; Amsterdam the Netherlands
| | - W. Ganzevoort
- Department of Obstetrics; Academic Medical Center; Amsterdam the Netherlands
| | - M. Coppens
- Haemophilia Comprehensive Care Centre; Academic Medical Center; Amsterdam the Netherlands
- Department of Vascular Medicine; Academic Medical Center; Amsterdam the Netherlands
| | - M. Peters
- Department of Paediatric Haematology; Academic Medical Center; Amsterdam the Netherlands
- Haemophilia Comprehensive Care Centre; Academic Medical Center; Amsterdam the Netherlands
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6
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Platokouki H, Fischer K, Gouw SC, Rafowicz A, Carcao M, Kenet G, Liesner R, Kurnik K, Rivard GE, van den Berg HM. Vaccinations are not associated with inhibitor development in boys with severe haemophilia A. Haemophilia 2017; 24:283-290. [DOI: 10.1111/hae.13387] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2017] [Indexed: 01/22/2023]
Affiliation(s)
- H. Platokouki
- Haemophilia-Haemostasis Unit; St. Sophia Children's Hospital; Athens Greece
| | - K. Fischer
- Van Creveldkliniek; University Medical Centre Utrecht; Utrecht The Netherlands
| | - S. C. Gouw
- Department of Paediatric Haematology; Academic Medical Centre Amsterdam; Emma Children's Hospital; Amsterdam The Netherlands
| | - A. Rafowicz
- Centre de Référence pour le Traitement des Maladies Hémorragiques (CRTH); Hôpital Bicêtre; Paris France
| | - M. Carcao
- Division of Haematology/Oncology; Department of Paediatrics and Child Health Evaluative Sciences; Research Institute; Hospital for Sick Children; Toronto ON Canada
| | - G. Kenet
- National Haemophilia Centre; Ministry of Health; Sheba Medical Center; Tel Hashomer Israel
| | - R. Liesner
- Department of Haematology; Haemophilia Centre; Great Ormond Street Hospital for Children; London UK
| | - K. Kurnik
- Dr. v. Haunersches Kinderspital; University of Munich; Munich Germany
| | - G. E. Rivard
- Division of Haematology/Oncology; Hôpital St. Justine; Montréal QC Canada
| | - H. M. van den Berg
- PedNet Haemophilia Research Foundation; Mollerusstraat1 3743BW Baarn The Netherlands
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7
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Timmer MA, Gouw SC, Feldman BM, Zwagemaker A, de Kleijn P, Pisters MF, Schutgens REG, Blanchette V, Srivastava A, David JA, Fischer K, van der Net J. Measuring activities and participation in persons with haemophilia: A systematic review of commonly used instruments. Haemophilia 2017; 24:e33-e49. [DOI: 10.1111/hae.13367] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/02/2017] [Indexed: 11/30/2022]
Affiliation(s)
- M. A. Timmer
- Van Creveldkliniek; University Medical Center Utrecht; Utrecht University; The Netherlands
- Physical Therapy Research; Department of Rehabilitation; Physical Therapy Science and Sport; Brain Center Rudolf Magnus; Utrecht University; The Netherlands
| | - S. C. Gouw
- Department of Pediatric Hematology; Academic Medical Center; Amsterdam The Netherlands
| | - B. M. Feldman
- Division of Rheumatology; Department of Paediatrics; The Hospital for Sick Children; Institute of Health Policy, Management and Evaluation; Dalla Lana School of Public Health; University of Toronto; Toronto ON Canada
| | - A. Zwagemaker
- Department of Pediatric Hematology; Academic Medical Center; Amsterdam The Netherlands
| | - P. de Kleijn
- Van Creveldkliniek; University Medical Center Utrecht; Utrecht University; The Netherlands
- Physical Therapy Research; Department of Rehabilitation; Physical Therapy Science and Sport; Brain Center Rudolf Magnus; Utrecht University; The Netherlands
| | - M. F. Pisters
- Physical Therapy Research; Department of Rehabilitation; Physical Therapy Science and Sport; Brain Center Rudolf Magnus; Utrecht University; The Netherlands
- Center for Physical Therapy Research and Innovation in Primary Care; Julius Health Care Centers; Utrecht The Netherlands
| | - R. E. G. Schutgens
- Van Creveldkliniek; University Medical Center Utrecht; Utrecht University; The Netherlands
| | - V. Blanchette
- Department of Pediatrics; Division of Hematology/Oncology Hospital for Sick Children; University of Toronto; Toronto ON Canada
| | - A. Srivastava
- Department of Haematology; Christian Medical College; Vellore India
| | - J. A. David
- Department of Physical Medicine and Rehabilitation; Christian Medical College; Vellore India
| | - K. Fischer
- Van Creveldkliniek; University Medical Center Utrecht; Utrecht University; The Netherlands
| | - J. van der Net
- Department of Child Development and Exercise; University Medical Center Utrecht and Children's Hospital; Utrecht University The Netherlands
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8
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Clausen N, Petrini P, Claeyssens-Donadel S, Gouw SC, Liesner R. Similar bleeding phenotype in young children with haemophilia A or B: a cohort study. Haemophilia 2014; 20:747-55. [DOI: 10.1111/hae.12470] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2014] [Indexed: 11/27/2022]
Affiliation(s)
- N. Clausen
- Department of Pediatrics; University Hospital of Aarhus at Skejby; Aarhus Denmark
| | - P. Petrini
- Department of Pediatrics; Clinic of Coagulation Disorders; Karolinska Hospital; Stockholm Sweden
| | | | - S. C. Gouw
- Department of Pediatric Hematology; Emma Children's Hospital; Academic Medical Center; Amsterdam The Netherlands
| | - R. Liesner
- Haemophilia Comprehensive Care Centre; Great Ormond Street Hospital for Children NHS Foundation Trust; London UK
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9
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Bom JG, Gouw SC, Rosendaal FR. Second‐generation recombinant factor
VIII
and inhibitor risk: interpretation of
RODIN
study findings and implications for patients with haemophilia A. Haemophilia 2013; 20:e171-4. [DOI: 10.1111/hae.12342] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2013] [Indexed: 11/30/2022]
Affiliation(s)
- J. G. Bom
- Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
- Center for Clinical Transfusion Research Sanquin Research Leiden The Netherlands
| | - S. C. Gouw
- Department of Pediatrics Amsterdam Medical Center Amsterdam The Netherlands
| | - F. R. Rosendaal
- Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
- Department of Thrombosis and Hemostasis & Einthoven Laboratory Leiden University Medical Center Leiden The Netherlands
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10
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Balak DMW, Gouw SC, Plug I, Mauser-Bunschoten EP, Vriends AHJT, Van Diemen-Homan JEM, Rosendaal FR, van der Bom JG. Prenatal diagnosis for haemophilia: a nationwide survey among female carriers in the Netherlands. Haemophilia 2012; 18:584-92. [PMID: 22250892 DOI: 10.1111/j.1365-2516.2011.02742.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Carriers of haemophilia face difficult choices regarding prenatal diagnosis, but little is known about the determinants that influence their decisions. The aim of this study was to assess the incidence of prenatal diagnosis and potential determinants affecting the choice for prenatal diagnosis. A nationwide survey was performed among all women who underwent carriership testing for haemophilia in the Netherlands between 1992 and 2004. Prenatal diagnosis was assessed in 207 carriers of haemophilia A or B who had been pregnant. Prenatal diagnosis was categorized into early first trimester (Y-PCR testing or chorionic villus sampling) often intended to prevent the birth of a child with haemophilia, and into late prenatal diagnosis (amniocentesis or ultrasound assessment) aimed at obstetrical management. Of 207 carriers 112 (54%) underwent prenatal diagnosis. Forty-eight women underwent early prenatal diagnosis and 64 women underwent late prenatal diagnosis. In 26 pregnancies early prenatal diagnosis was positive for haemophilia, and in 18 of these pregnancies termination was opted for. The choice for early prenatal diagnosis was associated with a liberal view towards termination of pregnancy (relative risk (RR) 12.5; 95% confidence interval (CI) 3.1-51.2), severe haemophilia in the family (RR 20.2; CI 2.7-153.6), absence of a religion (RR 1.9; CI 1.1-3.1) and older age (RR 2.0; CI 1.0-3.9). The choice for late prenatal diagnosis was associated with birth year after 1970 (RR 2.3; CI 1.5-3.5) and a previous child with haemophilia (RR 2.2; CI 1.4-3.4). More than half of all Dutch haemophilia carriers underwent prenatal diagnosis. Several determinants were strongly associated with prenatal diagnosis.
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Affiliation(s)
- D M W Balak
- Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands
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11
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Gouw SC, van den Berg HM, le Cessie S, van der Bom JG. Treatment characteristics and the risk of inhibitor development: a multicenter cohort study among previously untreated patients with severe hemophilia A. J Thromb Haemost 2007; 5:1383-90. [PMID: 17456190 DOI: 10.1111/j.1538-7836.2007.02595.x] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
CONTEXT The development of inhibitory antibodies against infused factor (F) VIII is a major complication of treatment of patients with severe hemophilia A. OBJECTIVE This study was set up to examine the effects of treatment-related factors on inhibitor development among previously untreated patients with severe hemophilia A. DESIGN, SETTING AND PATIENTS In this multicenter cohort study, we combined individual patient data obtained from four recombinant FVIII product registration studies (Kogenate, Kogenate Bayer, Recombinate, ReFacto) that were performed between 1989 and 2001. From the databases we selected all 236 previously untreated patients with severe hemophilia A who were subsequently treated with FVIII on at least 50 days. MAIN OUTCOME MEASURES Clinically relevant inhibitor development, defined as the occurrence of at least two positive inhibitor titers and a decreased recovery. RESULTS 67 patients (28%) developed clinically relevant inhibitors (44 high-titer) at a median of ten exposure days. Age at first exposure was not associated with inhibitor development. Peak treatment moments and surgical procedures were related to an increased inhibitor risk [adjusted relative risk 1.6 (95% confidence interval 1.0-2.6) and 2.7 (95% confidence interval 1.3-5.7), respectively]. A shorter duration between exposure days was associated with an increased risk of inhibitor development. There was a possible association between dosing of FVIII and inhibitor development, which largely disappeared after adjustment for confounding factors. INTERPRETATION These findings show that intensive treatment periods are associated with an increased risk of inhibitor development in previously untreated patients with severe hemophilia A. Our results do not support the notion that age at first exposure is associated with the risk of developing inhibitors.
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Affiliation(s)
- S C Gouw
- Van Creveldkliniek, and Department of Pediatrics, University Medical Center Utrecht, Utrecht, The Netherlands
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12
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Le TN, Gouw SC, Hoorntje TM, Sreeram N. Implantable diagnostic and therapeutic devices in children. Neth Heart J 2002; 10:462-466. [PMID: 25696046 PMCID: PMC2499809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
Abstract
Many advances have been made in the use of implantable diagnostic and therapeutic devices in adults. In children the indications for and diagnostic and therapeutic value of these devices still have to be determined. Our aim is to provide an overview of the clinical use of diagnostic and therapeutic devices in children. The role of implantable loop recorders (ILR), the feasibility and safety of transvenous pacing in neonates, the value of permanent pacing in children with recurrent syncope or reflex anoxic seizures and the role of implantable cardioverter defibrillator devices are highlighted with relevant case histories.
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