Respiratory Failure Clinical Trial
Official title:
Time Course of Neuro-ventilatory Efficiency During a Spontaneous Breathing Training
The TONES trial aims to evaluate the neuroventilatory efficiency (NVE = tidal volume / peak voltage of diaphragm contraction) measured during a zero-assist manoeuvre (ZAM, i.e. with PEEP but without pressure support). This novel parameter, NVE-ZAM, will be studied in a blocked, crossover, repeated measures design. Possible confounders, such as activity of respiratory muscles other than the diaphragm, are included. The investigators hypothesized that - the NVE during a zero-assist maneuver has a low variability and high repeatability at the same level of PEEP (within subjects, within blocks) - NVE-ZAM trends differ between participants (between subjects, within blocks) and between PEEP levels (within subjects, between blocks) The primary aim is to study the variability and repeatability of the NVE-ZAM within subjects and within blocks. Additionally, the effect of PEEP, muscle fatigue and recruitment of the accessory and expiratory muscles of respiration on the NVE-ZAM will be studied in an exploratory analysis (in multiple combinations of within and between subjects and/or blocks).
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