Inspiratory effort and breathing pattern change in response to varying the assist level: A physiological study.

Respiratory Physiology & Neurobiology
Emmanouil LilitsisE Kondili

Abstract

To describe the response of breathing pattern and inspiratory effort upon changes in assist level and to assesss if changes in respiratory rate may indicate changes in respiratory muscle effort. Prospective study of 82 patients ventilated on proportional assist ventilation (PAV+). At three levels of assist (20 %-50 %-80 %), patients' inspiratory effort and breathing pattern were evaluated using a validated prototype monitor. Independent of the assist level, a wide range of respiratory rates (16-35br/min) was observed when patients' effort was within the accepted range. Changing the assist level resulted in paired changes in inspiratory effort and rate of the same tendency (increase or decrease) in all but four patients. Increasing the level in assist resulted in a 31 % (8-44 %) decrease in inspiratory effort and a 10 % (0-18 %) decrease in respiratory rate. The change in respiratory rate upon the change in assist correlated modestly with the change in the effort (R = 0.5). Changing assist level results in changes in both respiratory rate and effort in the same direction, with change in effort being greater than that of respiratory rate. Yet, neither the magnitude of respiratory rate change nor the resulting absolute value may r...Continue Reading

Citations

Aug 12, 2020·Intensive Care Medicine·Annemijn H JonkmanLaurent J Brochard
Dec 17, 2021·Critical Care : the Official Journal of the Critical Care Forum·Filippo AlbaniGiuseppe Natalini

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