Examinando por Autor "Roncalli Rocha, Angelo"

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    Mascarillas para oxigenoterapia de alto flujo: ¿Son realmente Venturi?
    (Sociedad de Anestesiologia de Chile, 2022) Fajardo Campoverdi, Aurio; Adasme Jeria, Rodrigo; Maturana Quinones, Michael; Roncalli Rocha, Angelo; Cristancho Gomez, William
    Oxygen therapy is the mainstay for the treatment of hypoxia. The use of devices capable of satisfying the necessary flow demanded by the patient also offers stable and predictable oxygen concentrations, which is why they are currently considered a reliable and safe therapeutic tool. The physical mechanism for the operation of these devices is based on a modification of Bernoulli's principle. The supply of a constant flow of oxygen, when its pressure drops, increases its velocity and consequently allows the incorporation of ambient air into the system. However, in order to be granted the Venturi designation, structural requirements in geometrical, physical and thermodynamic terms must be met. The ISO standard specifies a Venturi tube by three fundamental parts: a contraction zone (inlet of a continuous flow of a gas), a constriction zone (smaller in radius than the contraction zone, so as to increase the fluid velocity) and a diffusion zone (outlet of a gas mixture with ambient air). In conclusion, the designation of Venturi to high-flow oxygen therapy masks is at least questionable. © 2022 Sociedad de Anestesiologia de Chile. All rights reserved.