title: Platelet aggregation in term and preterm newborns.
abstract: The platelets of newborns have a hyporeactive period. This period, during which the platelet count is normal but their functions are deficient, is called transient platelet hyporeactivity of newborns. The platelet functions and their normalizing process of term and preterm neonates are investigated. Twenty term and 20 preterm (gestational age <37 weeks) newborns were enrolled in the study. Twenty-eight healthy children aged 2 months to 3 years old participated in the study as the control group. Healthy newborns were followed for 15 days after birth longitudinally in 3 periods: period 1 (0-4 days), period 2 (5-9 days), period 3 (10-15 days). Aggregation studies were performed from whole blood samples. Whole blood aggregation was measured by the impedance method. Transient hyporeactivity of platelets was found in term and preterm groups, and there was no difference between term and preterms. Platelets of newborns gained their normal functions at postnatal 10-14 days. The results show that hyporeactivity of platelets during the first 9 days of life is physiological and transient.
authors.affiliation: Ankara University Faculty of Medicine, Department of Pediatrics, Division of Pediatric Hematology, Ankara, Turkey.
authors.forename: Tayfun
authors.initials: T
authors.lastname: Uçar
authors.forename: Ceyda
authors.initials: C
authors.lastname: Gurman
authors.forename: Saadet
authors.initials: S
authors.lastname: Arsan
authors.forename: Sabri
authors.initials: S
authors.lastname: Kemahli
mesh_terms: D000244:Adenosine Diphosphate / Q000494:pharmacology; D016022:Case-Control Studies; D002675:Child, Preschool; D003094:Collagen / Q000494:pharmacology; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008137:Longitudinal Studies; D010974:Platelet Aggregation / Q000187:drug effects; D010979:Platelet Function Tests; D047928:Premature Birth / Q000097:blood*; D012310:Ristocetin / Q000494:pharmacology
chemical_list: D012310:Ristocetin; D000244:Adenosine Diphosphate; D003094:Collagen