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Background  Early detection of respiratory overload is crucial to mechanically ventilated patients, especially during phases of spontaneous breathing. Although a diversity of methods and indices has been established, there is no highly specific approach to predict respiratory failure. This study aimed to evaluate acceleration sensors in abdominal and thoracic wall positions to detect alterations in breathing excursions in a setting of gradual increasing airway resistance.    Methods  Twenty-nine healthy volunteers were committed to a standardized protocol of a two-minutes step-down spontaneous breathing on a 5 mm, 4 mm and then 3 mm orally placed endotracheal tube. Accelerator sensors in thoracic and abdominal wall position monitored breathing excursions. 15 participants passed the breathing protocol (“completed” group), 14 individuals cancelled the protocol due to subjective intolerance to the increasing airway resistance (“abandoned” group).    Results  Gradual increased respiratory workload led to a significant decrease of acceleration in abdominal wall position in the “abandoned” group compared to the “completed” group ( p  < 0.001), while these gradual accelerating changes were not observed in thoracic wall position ( p  = 0.484). Thoracic acceleration sensors did not detect any time- and group-specific changes ( p  = 0.746).    Conclusions  The abdominal wall position of the acceleration sensors may be a non-invasive, economical and practical approach to detect early breathing alterations prior to respiratory failure.    Trial registration  EK 309–15; by the Ethics Committee of the Faculty of Medicine, RWTH Aachen, Aachen, Germany. Retrospectively registered 28th of December 2015.

journal of cardiothoracic surgery

Acceleration sensors in abdominal wall position as a non-invasive approach to detect early breathing alterations induced by intolerance of increased airway resistance