RESUMO
Background: Inflammation and coagulation are closely linked events. Thrombin is the key enzyme in coagulation system and also has roles in inflammation. Objective: The aim of our study was to evaluate thrombin generation in children with mild asthma. Methods: Forty-two children with mild asthma and 49 healthy children were included in the study. All patients performed spirometry. Thrombin generation tests (TGT) were performed with a calibrated automated thrombogram (CAT) in children without asthma exacerbation during the last six months. During CAT assay thrombogram curves were obtained. The area under the curve showed endogenous thrombin potentials and indicated the total amount of endogenous thrombin generated; the peak height showed the highest thrombin value, thrombin lag time and time to thrombin peak were measured. Results: Thrombin lag time was significantly longer in children with asthma (3.98 ± 1.2 min) compared to those in the control group (3.29 ± 0.6min) (p < 0.01). Children with asthma also had longer thrombin tail time compared to the control group (19.5 ± 8.9 min vs. 16.7 ± 2.9 min, p = 0.02). Thrombin peak was inversely correlated with FEF 25-75 (r = -0.41, p < 0.01). Thrombin lag time was inversely correlated with FEF 25-75 (r = -0.39, p < 0.01). Conclusion: Inflammation in mild asthma seems to disturb coagulation but this disturbance may not be so strong as to increase thrombin levels and may only affect the initiation phase of thrombin generation
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Assuntos
Humanos , Masculino , Feminino , Pré-Escolar , Criança , Adolescente , Asma/metabolismo , Inflamação/metabolismo , Trombina/metabolismo , Coagulação Sanguínea , Testes de Coagulação Sanguínea , Calibragem , Progressão da Doença , Índice de Gravidade de DoençaRESUMO
BACKGROUND: Acute urticaria is an immune-inflammatory disease, characterised by acute immune activation. There has been increasing evidence showing that vitamin D deficiency is associated with increased incidence and severity of immune-inflammatory disorders. OBJECTIVE: The aim of this study was to evaluate serum vitamin D levels in acute urticaria. METHODS: We enrolled 30 children with acute urticaria and 30 control subjects. Concentrations of 25-hydroxyvitamin D [25(OH)D], a biomarker of vitamin D status, were measured in serum of acute urticaria patients and compared with the control group. RESULTS: There were no significant differences in baseline variables (age, gender, weight) between the groups. Vitamin D deficiency (<20ng/ml) was significantly higher in patients with acute urticaria than in control patients. Serum 25(OH)D levels were significantly lower in the study group compared to those in the control group (13.1±4.3 vs 28.2±7.4ng/mL, p < 0.05). Moreover, we found negative correlation between mean duration of acute urticaria and serum vitamin D levels (p < 0.01). CONCLUSION: This study revealed a significant association of lower serum 25(OH)D concentrations with acute urticaria and an inverse relationship with disease duration. These findings may open up the possibility of the clinical use of vitamin D as a contributing factor in the pathogenesis of acute urticaria and a predictive marker for disease activity in acute urticaria. A potential role of vitamin D in pathogenesis and additive therapy in acute urticaria needs to be examined
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