High flow Tracheal oxygen: assessment of diaphragmatic functionality by ultrasonography in adults during weaning from mechanical ventilation Ignacio Fernández Ceballos; Ivan Alfredo Huespe; María Sofía Venuti; Bruno Leonel Ferreyro; José María Dianti; Romina Famiglietti; Ana Montserrat Rivera; Indalecio Carboni Bisso; Marcos Jose Las Heras;