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Shear Elastic Coefficient of Normal and Fibrinogen-Deficient Clotting Plasma Obtained with a Sphere-Motion-Based Acoustic-Radiation-Force Approach.
Costa-Júnior, José Francisco Silva; Parcero, Guilherme Crossetti; Machado, João Carlos.
Afiliação
  • Costa-Júnior JFS; Brazilian Air Force Academy, Pirassununga, Brazil; Biomedical Engineering Program-COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address: francisco@sbeb.org.br.
  • Parcero GC; Biomedical Engineering Program-COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
  • Machado JC; Biomedical Engineering Program-COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Post-Graduation Program on Surgical Sciences, School of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
Ultrasound Med Biol ; 48(1): 111-123, 2022 01.
Article em En | MEDLINE | ID: mdl-34674885
Blood coagulation is a process involving several chemical reactions governed by coagulation factors, during which the shear elastic coefficient, µ, varies as the medium transitions from liquid to gel phase. This work used ultrasound to measure µ during the clotting of human plasma samples by tracking the motion of a glass sphere located inside a cuvette filled with the plasma. A 2.03 MHz ultrasonic system generated an impulsive acoustic radiation force acting on the sphere, and a 4.89 MHz pulse-echo ultrasonic system tracked the sphere displacement induced by that force. Measurements of µ were determined by fitting a µ-dependent theoretical model to the motion waveform of the sphere immersed in clotting normal plasma and plasma samples with fibrinogen (FI) concentrations of 1.2 (FI-deficiency) and 3.6 (FI-normal) g/L. For normal plasma, µ started at 14.22 Pa and increased rapidly until 2 min, then slowly until it reached 210.23 Pa at 35 min after the clotting process started. A similar trend was exhibited in plasma samples with FI concentrations of 1.2 and 3.6 g/L, with µ reaching 120.55 and 679.42 Pa, respectively. A theoretical model, related to the kinetics of clot-structure formation, describes the time changes of µ for the clotting plasma samples. The sphere-motion-based acoustic-radiation-force approach allowed us to measure the shear elastic coefficient during the coagulation process of plasma samples with normal and deficient FI concentrations. Our results suggest that the method used in this study is capable of being used to detect bleeding disorders.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Fibrinogênio / Hemostáticos Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Fibrinogênio / Hemostáticos Idioma: En Ano de publicação: 2022 Tipo de documento: Article