• Ángel Augusto Pérez-Calatayud, Raúl Carrillo-Esper, and Emilio Arch-Tirado.
• Medicina Intensiva, Fundación Clínica Médica Sur, Grupo Mexicano Para el Estudio de la Medicina Intensiva, Ciudad de México, México.
• Gac Med Mex. 2016 May 1; 152 (3): 304-12.

IntroductionMechanical ventilation is a therapy for vital support used in a significant proportion of critically ill patients. The right time to successfully discontinue this therapy is a challenge for the intensive care specialist. For this reason it is still a subject for research. The echocardiographic evaluation of the diastolic dysfunction, the diaphragm, and the lung have become an invaluable tool for weaning from mechanical ventilation protocols, especially in patients with difficult or prolonged weaning from mechanical ventilation. There is still a need to validate, in controlled trials, the efficacy of an ultrasound protocol for weaning from mechanical ventilation that integrates the three modalities in a single protocol.MethodsBased on current literature, we developed a score justified by a mathematical model based on inequations. When χ ⇒ 5 the risk of failure in the weaning process rises, the weaning process should be suspended; when χ ⇒ 1 the risk of failure is low, the weaning process should be continued.ConclusionsThe use of math models for decision-making is of great importance, as it sets an objective parameter within the existing evaluations. We proposed the use of inequations to set intervals of solution with the three points of care for ultrasound-guided weaning from mechanical ventilation. With this, the inequations proposed generate an area of certainty within the proposed values and the solution intervals.

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