• Nuno Cortesão, Marco Fernandes, Danielson Pina, Felipe Fernandes, José Vale Machado, and António H Carneiro.
• Unidade de Cuidados Intensivos. Departamento de Medicina. Hospital da Luz - Arrábida. Vila Nova de Gaia. Portugal.
• Acta Medica Port. 2021 Jan 4; 34 (1): 12-19.

IntroductionThe new coronavirus pandemic has led to scarcity of invasive ventilation resources in hospitals in several countries. In this context, the Portuguese Medical Association invited intensive care physicians who, in collaboration with SYSADVANCE S.A., developed SYSVENT OM1, a ventilator capable of operating in controlled and assisted modes (volume and pressure) and able to treat patients admitted to intensive care units. In this study we do the proof of concept comparing programmed tidal volume, inspiratory pressure and positive end-expiratory pressure with those measured by the ventilator and an external measuring equipment.Material And MethodsWe set up the ventilator in tandem with an artificial lung and a flow analyzer. We measured expiratory tidal volume, and inspiratory pressure against three levels of compliance, each with six steps of tidal volume. Positive end-expiratory pressure was measured at 2 cmH2O incremental along eight steps. For each measurement, we performed three readings.ResultsConsidering each of the three single variables, the mean value of the highest difference between programmed values and measured values is, for all of them, within what we considered to be acceptable for a prototype model (tidal volume = -28.1 mL, inspiratory pressure = 0.8 cmH2O and positive end-expiratory pressure = -1.1 cmH2O). This difference is greater when evaluated with the external measuring equipment in comparison with the ventilator.DiscussionThe results showed a good monitoring and accuracy performance. Technical limitations related with the artificial lung and the flow analyzer have been documented, which do not compromise the results, but limit their amplitude.ConclusionFor tested parameters, the ventilator has a good operating performance, is in accordance with the initial premises and has potential for clinical use.

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