Abstract Aim: This study aimed to investigate the in-vitro platelet aggregation and secretion tests in children patients with Henoch-schöenlein Purpura that recently referred to as Ig A vasculitis Methods: This is a cross-section study that included 55 patients with Henoch-schöenlein Purpura and 31 healthy children as a control group. Children who have a history of drug use, chronic diseases, and bleeding diseases were excluded from the study. Complete blood count, thrombocyte aggregation, and secretion tests were studied in both groups. These tests were re-evaluated in remission of the disease. Results: It was found that epinephrine-stimulated platelet aggregation and collagen, epinephrine, ristocetin, arachidonic acid, standard dose thrombin, and high dose thrombin-stimulated platelet secretion results were lower in the patients with Henoch-schöenlein Purpura compared to the healthy control group in the acute period (respectively P=0.014, 0,003; 0,003; 0,027; 0,034; 0,010; 0,049). When the values of patients with Henoch-schöenlein Purpura in the acute period and the remission of the disease were compared, collagen-stimulated platelet aggregation and epinephrine-stimulated platelet secretion values were found to be lower in patients with patients in the acute period (P= 0.016; 0.039) Conclusion: Impairment in vitro platelet aggregation and secretion tests in the patients with Henoch-schöenlein Purpura suggest that the tendency to bleeding in these patients may be due to platelet impairment function. Key Words: Henoch-schöenlein Purpura, platelet aggregation tests, platelet secretion tests, children, Ig A vasculitis. What’s already known about this topic? There is a tendency to bleeding in Henoch Shcöenlein Purpura patients, such as gastrointestinal bleeding, nonthrombocytopenic system purpura. What does this article add? It was found that impairment in-vitro platelet aggregation and secretion tests in Henoch Shcöenlein Purpura patients.

Objective: This study aimed to investigate the association between carotid intima-media changes that play a part in the atherosclerotic process in childhood obesity and fibrin monomers as an important indicator of fibrin plaque. Methods: This is a cross-sectional study of obese children and non-obese healthy control subjects. Height, weight, body mass index, waist/hip ratio, systolic/diastolic blood pressures were recorded, in addition, biochemistry, hemogram, fibrin monomers and d-dimer were measured in both groups. Right and left common carotid intima-media thicknesses were measured by ultrasonography and mean carotid intima-media thickness was calculated. Results: Obese children (n=89, 46.1% girls, median age: 12.6±2.3 years) and healthy control group (n=40, 52.5% girls, median age: 13.2±2.2 years) were comparable in terms of gender, age and puberty stage. Mean carotid intima-media thickness was higher in obese children than the healthy control group (p=0.002). There was no difference between the two groups in terms of fibrin monomers and D-dimer levels. In obese children, there was a weak negative correlation between mean carotid intima-media thickness and fibrin monomers (p=0.030, r=-0.233). Conclusion: In obese children, mean carotid intima-media thickness was determined higher, as an early indicator of atherosclerosis. We want to emphasize that obese children are at risk for cardiovascular disease and should be evaluated in terms of atherosclerosis. This study investigates the relation between increased carotid intima-media thickness and fibrin monomers, in children, the first time in Literature. What’s already known about this topic? It is possible to reveal the early period of the atherosclerosis process by showing carotid intima medial thickness. Fibrin is a major component of many atherosclerotic plaques. What does this article add? Our study investigated the relationship between mean carotid intima-media thickness in childhood obesity and fibrin monomers. But no positive correlation was found between fibrin monomers and the carotid intima-media thickness.