Jorge David Aivazoglou Carneiro

Background: Kidney transplantation is the gold standard treatment for children with end‐stage chronic kidney disease. Graft thrombosis is an important cause of graft failure, with high morbidity, mortality, and impact on quality of life and to the health system. The role of thromboprophylaxis in this setting is still uncertain. We describe the demographic characteristics and thrombotic risk factors in pediatric renal transplant recipients, determining the rate of renal graft thrombosis, and discuss the role of thromboprophylaxis.Methods: This retrospective study reviewed 96 pediatric renal transplantations between 2008 and 2017 in a single hospital. Patients were assigned to one of two groups: children who did not receive thromboprophylaxis after transplantation and those who did. We reported their characteristics, comparing the incidence of graft thrombosis and hemorrhagic complications between the groups.Results: Forty‐nine patients (51%) received thromboprophylaxis. Thrombosis occurred in 5 patients who did not receive thromboprophylaxis (5.2%) compared with none in the group that did (p = .025). In all patients, renal graft thrombosis resulted in early graft loss. Thirteen patients had hemorrhagic complications. Seven were unrelated to pharmacological thromboprophylaxis (2 major, 1 moderate, and 4 minor bleeding, which either did not receive thromboprophylaxis or had bleeding prior to thromboprophylaxis), while six occurred during heparinization (2 major, 1 moderate, and 3 minor bleeding). There was no significant difference in the rate of hemorrhagic complications between the groups (p = .105).Conclusions: The rate of renal graft thrombosis was 5.2%. Thrombosis remains an important cause of early graft loss. Thromboprophylaxis was associated with a reduction in graft thrombosis without increased risk of bleeding.

Hemostasis in children and adolescents: ontogenetic characteristics and impact on pediatric thromboembolism During phylogenetic evolution, living beings develop a regulatory hemostatic system for protecting the cardiovascular system. In humans, the hemostatic system has a peculiar ontogenesis, which consists of a dynamic evolutionary process deeply influenced by age. The term “developmental hemostasis” has been used since the 1990s to describe age-dependent changes in the hemostatic system, as seen in (). Children are physiologically protected from thromboembolic events due to a decreased [...] Hemostasis in children and adolescents: ontogenetic characteristics and impact on pediatric thromboembolism During phylogenetic evolution, living beings develop a regulatory hemostatic system for protecting the cardiovascular system. In humans, the hemostatic system has a peculiar ontogenesis, which consists of a dynamic evolutionary process deeply influenced by age. The term “developmental hemostasis” has been used since the 1990s to describe age-dependent changes in the hemostatic system, as seen in (). Children are physiologically protected from thromboembolic events due to a decreased