Different inspiratory flow waveform in volume-controlled ventilation in a Covid-9 context


Pulmonary ventilation still remains as one of the mainstays in coping with respiratory pathologies. One of the ventilation modes found in lung ventilators is the continuous mandatory mode with volume control (CMV-VC), in which the equipment seeks to deliver a volume pre-set by the clinician. In addition to the volume to be delivered, the healthcare professional can define the type of flow wave in which the ventilator will generate to achieve the desired volume. Among the available waveforms, there are the constant waveform and the decelerated waveform. The choice of a type of waveform, today, remains unclear in the literature. The objective of this study is to evaluate the behavior and effects of constant and decelerated flow on volume delivery to the patient. To carry out the study, the guidelines of the ABNT NBR ISO 80601-2-12:2014 standard, a Brazilian technical standard that details the performance and safety criteria of lung ventilators in different physiological scenarios, were taken as a basis. A lung simulator, a pneumotachograph and a pressure transducer were used to collect flow and pressure data from the lung ventilators that were processed in a virtual programming environment. The results obtained showed that the different flow curves impact the maximum inspiratory flow, the delivered volume and the maximum pressure reached by each device.

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