Navegando por Palavras-chave "Portal blood flow"

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    Avaliação do volume de fluxo portal em pacientes esquistossomóticos: estudo comparativo entre ressonância magnética e ultrassom Doppler
    (Colégio Brasileiro de Radiologia e Diagnóstico por Imagem, 2010-12-01) Leão, Alberto Ribeiro de Souza [UNIFESP]; Sales, Danilo Moulin [UNIFESP]; Santos, José Eduardo Mourão [UNIFESP]; Nakano, Edson Minoru [UNIFESP]; Shigueoka, David Carlos [UNIFESP]; D'Ippolito, Giuseppe [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    OBJECTIVE: To evaluate the agreement between Doppler ultrasonography and magnetic resonance imaging as well as the interobserver reproducibility of both methods in the measurement of portal blood flow in schistosomal patients. MATERIALS AND METHODS: A cross-sectional, observational, self-paired study evaluated 21 patients with schistosomiasis mansoni submitted to measurement of portal blood flow with phase-contrast magnetic resonance imaging and Doppler ultrasonography. RESULTS: A poor intermethod agreement was observed (intraclass correlation coefficient: 34.5% [CI 95%]). On the other hand, the interobserver reproducibility was excellent in the evaluation by magnetic resonance imaging (intraclass correlation coefficient: 99.2% [CI 95%] / Pearson's correlation coefficient: 99.2% / portal blood flow = 0.806) and by Doppler ultrasonography (intraclass correlation coefficient: 80.6 to 93.0% [CI 95%] / Pearson's correlation coefficient: 81.6% to 92.7% / portal blood flow = 0.954, 0.758 and 0.749). CONCLUSION: There is a poor intermethod agreement in the measurement of portal blood flow. Nevertheless, contrast-phase magnetic resonance imaging and Doppler ultrasonography demonstrated to be reproducible methods presenting excellent interobserver agreement in the quantification of portal blood flow in patients with hepatosplenic schistosomiasis-related portal hypertension
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    Quantificação do fluxo portal em indivíduos sadios: comparação entre ressonância magnética e ultra-som Doppler
    (Colégio Brasileiro de Radiologia e Diagnóstico por Imagem, 2008-08-01) Costa, Juliana Dantas da [UNIFESP]; Leão, Alberto Ribeiro de Souza [UNIFESP]; Santos, José Eduardo Mourão [UNIFESP]; Moulin, Danilo Sales [UNIFESP]; Sebastianes, Patrícia Moreno [UNIFESP]; D'Ippolito, Giuseppe [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    OBJECTIVE: To evaluate the inter-observer agreement between Doppler ultrasonography and magnetic resonance imaging in the quantification of portal blood flow in healthy individuals, as well as evaluating the reproducibility of both methods. MATERIALS AND METHODS: A prospective, transverse, observational and self-paired study was developed evaluating 20 healthy volunteers whose portal blood flow was measured by means of Doppler ultrasonography and magnetic resonance imaging performed by two independent observers. Interobserver and intermethod agreements were calculated using the intraclass and Pearson's correlation coefficients. RESULTS: The agreement between Doppler ultrasonography and magnetic resonance imaging was low (intraclass coefficient: 1.9%-18.2%; Pearson's coefficient: 0.1%-13.7%; p=0.565). Mean values for the portal blood flow measured by Doppler ultrasonography and magnetic resonance imaging were respectively 0.768 l/min and 0.742 l/min. Interobserver agreement for quantification of the portal blood flow by Doppler ultrasonography and magnetic resonance imaging was respectively reasonable (intraclass coefficient: 43.3%; Pearson's coefficient: 43.0%) and excellent (intraclass coefficient: 91.4%; Pearson's coefficient: 93.4%). CONCLUSION: In the present study, magnetic resonance imaging demonstrated to be a reliable method for quantifying the portal blood flow, with a higher interobserver agreement than Doppler ultrasonography. The intermethod agreement was low.