RESUMO
In this paper, an original method of evaluating the physical properties of wheat-flour-water systems using high-frequency low-power ultrasound is presented. Most of the experiments were performed with a reflectance technique measuring the acoustic impedance of doughs. The velocity of propagation, attenuation and viscoelastic moduli have been evaluated for both compressional and shear ultrasonic waves in the interval 2-10 MHz for doughs of different hydrations. The 53% water content was found to be critical with respect to the presence of free water. The influence of the mixing and rest times on the longitudinal ultrasonic parameters is also studied.
Assuntos
Farinha , Triticum , Ultrassom , ÁguaRESUMO
We evaluated the effectiveness of desmopressin to control bleeding of patients with coagulation defects during dental surgery. Thirty-five patients, mainly with moderate and mild hemophilia and Willebrand disease, were undergoing dental extractions (over 80 extractions in total). Bleeding was successfully prevented in 28 patients with the use of a combined treatment incorporating IV desmopressin, an antifibrinolytic agent (tranexamic acid), and local methods (surgical glue and compression techniques). Seven patients had a bleeding episode after dental extraction, which was controlled in two cases by repeated injection of desmopressin and in another two by local methods; Factor VIII substitutive treatment was needed in only three patients. Desmopressin offers an alternative to blood products to control bleeding risk in patients with moderate and mild coagulation defects. Our experience tends to specify the mode of administration of both desmopressin and the associated treatments. Our findings suggest that desmopressin can be used in conjunction with other treatments to prevent bleeding in patients with coagulation defects who undergo dental surgery. This work highlights the concept of multifactorial medical care of these patients in which desmopressin plays a major role.
