Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/6439
Title: Results from transcranial Doppler examination on children and adolescents with sickle cell disease and correlation between the time-averaged maximum mean velocity and hematological characteristics: a cross-sectional analytical study
Other Titles: Resultados do estudo do Doppler transcraniano em crianças e adolescentes portadores de doença falciforme e correlação entre a velocidade média máxima e características hematológicas: um estudo transversal analítico
Authors: Hokazono, Mary [UNIFESP]
Silva, Gisele Sampaio [UNIFESP]
Silva, Edina Mariko Koga da [UNIFESP]
Braga, Josefina Aparecida Pellegrini [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Keywords: Ultrasonography, Doppler, transcranial
Anemia, sickle cell
Hemoglobin SC disease
Stroke
Child
Adolescent
Ultrassonografia Doppler transcraniana
Anemia falciforme
Doença da hemoglobina SC
Acidente cerebral vascular
Criança
Adolescente
Issue Date: 1-May-2011
Publisher: Associação Paulista de Medicina - APM
Citation: HOKAZONO, Mary et al . Results from transcranial Doppler examination on children and adolescents with sickle cell disease and correlation between the time-averaged maximum mean velocity and hematological characteristics: a cross-sectional analytical study. Sao Paulo Med. J., São Paulo , v. 129, n. 3, p. 134-138, maio 2011
Abstract: CONTEXT AND OBJECTIVE: Transcranial Doppler (TCD) detects stroke risk among children with sickle cell anemia (SCA). Our aim was to evaluate TCD findings in patients with different sickle cell disease (SCD) genotypes and correlate the time-averaged maximum mean (TAMM) velocity with hematological characteristics. DESIGN AND SETTING: Cross-sectional analytical study in the Pediatric Hematology sector, Universidade Federal de São Paulo (UNIFESP). METHODS: 85 SCD patients of both sexes, aged 2-18 years, were evaluated, divided into: group I (62 patients with SCA/Sß0 thalassemia); and group II (23 patients with SC hemoglobinopathy/Sß+ thalassemia). TCD was performed and reviewed by a single investigator using Doppler ultrasonography with a 2 MHz transducer, in accordance with the Stroke Prevention Trial in Sickle Cell Anemia (STOP) protocol. The hematological parameters evaluated were: hematocrit, hemoglobin, reticulocytes, leukocytes, platelets and fetal hemoglobin. Univariate analysis was performed and Pearson's coefficient was calculated for hematological parameters and TAMM velocities (P < 0.05). RESULTS: TAMM velocities were 137 ± 28 and 103 ± 19 cm/s in groups I and II, respectively, and correlated negatively with hematocrit and hemoglobin in group I. There was one abnormal result (1.6%) and five conditional results (8.1%) in group I. All results were normal in group II. Middle cerebral arteries were the only vessels affected. CONCLUSION: There was a low prevalence of abnormal Doppler results in patients with sickle-cell disease. Time-average maximum mean velocity was significantly different between the genotypes and correlated with hematological characteristics.
CONTEXTO E OBJETIVO: Doppler transcraniano (DTC) detecta risco de acidente vascular cerebral (AVC) em crianças com anemia falciforme (AF). O objetivo foi avaliar os resultados ao DTC nos diferentes genótipos da doença falciforme (DF) e correlacionar a velocidade média-máxima (VMMáx) às características hematológicas. TIPO DE ESTUDO E LOCAL: Estudo transversal analítico realizado no setor de Hematopediatria da Universidade Federal de São Paulo (UNIFESP). MÉTODOS: 85 pacientes com DF, 2-18 anos, ambos os sexos, foram avaliados e divididos em: grupo I (62 com AF ou Sß0 talassemia); e grupo II (23 com hemoglobinopatia SC ou Sß+ talassemia). DTC foi realizado e revisado por um único investigador usando um aparelho de ultrassonografia Doppler com transdutor de 2MHz, conforme critérios do protocolo STOP (Stroke Prevention Trial in Sickle Cell Anemia). As variáveis hematológicas avaliadas foram: hematócrito, hemoglobina, reticulócitos, leucócitos, plaquetas, hemoglobina fetal. Análise univariada e coeficiente de Pearson calculados para parâmetros hematológicos e VMMáx, P < 0,05. RESULTADOS: As média das VMMáx foram de 137 ± 28 cm/s e 103 ± 19 cm/s nos grupos I e II, respectivamente. Houve correlação negativa da VMMáx com hematócrito e hemoglobina no grupo I. Houve um (1,6%) resultado anormal e 5 (8,1%) condicionais no grupo I; no grupo II, todos estavam normais. Artérias cerebrais médias foram as únicas acometidas. CONCLUSÃO: Houve baixa prevalência de resultados anormais ao DTC em pacientes com DF. A VMMáx foi significativamente diferente entre os genótipos da DF e apresentou correlação com variáveis hematológicas.
URI: http://repositorio.unifesp.br/handle/11600/6439
ISSN: 1516-3180
Other Identifiers: http://dx.doi.org/10.1590/S1516-31802011000300003
Appears in Collections:Artigo
Artigo

Files in This Item:
File Description SizeFormat 
S1516-31802011000300003.pdf130.95 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.