Hematological findings in Noonan syndrome

• Autor(a) principal: Bertola,Débora R.
• Data de Publicação: 2003
• Outros Autores: Carneiro,Jorge David A., D'Amico,Élbio Antônio, Kim,Chong A., Albano,Lilian Maria José, Sugayama,Sofia M.M., Gonzalez,Claudette H.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista do Hospital das Clínicas
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0041-87812003000100002
• topic: Noonan syndrome; Hematological findings; Coagulation-factor XI deficiency

OBJECTIVE: Noonan syndrome is a multiple congenital anomaly syndrome, and bleeding diathesis is considered part of the clinical findings. The purpose of this study was to determine the frequency of hemostatic abnormalities in a group of Noonan syndrome patients. METHOD: We studied 30 patients with clinical diagnosis of Noonan syndrome regarding their hemostatic status consisting of bleeding time, prothrombin time, activated partial thromboplastin time and thrombin time tests, a platelet count, and a quantitative determination of factor XI. RESULTS: An abnormal laboratory result was observed in 9 patients (30%). Although coagulation-factor deficiencies, especially factor XI deficiency, were the most common hematological findings, we also observed abnormalities of platelet count and function in our screening. CONCLUSIONS: Hemostatic abnormalities are found with some frequency in Noonan syndrome patients (30% in our sample). Therefore, we emphasize the importance of a more extensive hematological investigation in these patients, especially prior to an invasive procedure, which is required with some frequency in this disorder.