Dr Klaassen is a pediatric hematologist and leads the Comprehensive Hemophilia Care Clinic at CHEO. A full professor in the Department of Pediatrics at the University of Ottawa with a certificate in epidemiology, he is also the sitting president of the Association of Hemophilia Clinic Directors of Canada (AHCDC) Well known as both a clinician and researcher in health related Quality of Life, Dr Klaassen is the owner/inventor of the Transfusion Quality of Life measure (TranQol) for thalassemia patients, Kid’s ITP tools and the QUALMS (myelodysplastic syndrome). National and international collaborations are ongoing for academic research on immune thrombocytopenia (ITP) and marrow failure and his team actively participates in a number of registered clinical trials.
Adverse events in the paediatric emergency department: a prospective cohort study
Conclusion One in 40 children suffered adverse events related to ED care. A high proportion of events were preventable. Management and diagnostic issues warrant further study.
Increasing Incidence and Prevalence of Pathologic Hemoglobinopathies Among Children in Ontario, Canada from 1991-2013
Through an innovative approach using provincial health administrative, immigration and demographic data, this study identified a rising incidence and prevalence of hemoglobinopathies among Ontario children <18 years of age between April 1, 1991 and March 31, 2013, potentially due to increased immigration rates.
Response to treatment with azacitidine in children with advanced myelodysplastic syndrome prior to hematopoietic stem cell transplantation
We reviewed 22 pediatric patients with advanced myelodysplastic syndrome from a single center, diagnosed between January 2000 and December 2015. Of those, eight patients received off-label azacitidine before hematopoietic stem cell transplantation.
Quality of life in childhood immune thrombocytopenia: International validation of the kids’ ITP tools
Children 2–18 years of age with ITP and their parents were recruited in France, Germany, the United Kingdom and Uruguay.
Relationships among bleeding severity, health‐related quality of life, and platelet count in children with immune thrombocytopenic purpura
Bleeding severity grade correlated with platelet count in chronic ITP but not in acute ITP. Platelet count and bleeding severity failed to have any statistically significant correlations with the KIT scores.