Non-invasive detection of respiratory muscles activity during assisted ventilation |
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Authors: | Heyer Laurent Baconnier Pierre F Eberhard André Biot Loïc Viale Jean-Paul Perdrix Jean-Pierre Carry Pierre-Yves |
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Institution: | Laboratoire TIMC/IMAG, faculté de médecine de Grenoble, université Joseph-Fourier, 38700 La Tronche, France. |
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Abstract: | The instantaneous pressure applied by the respiratory muscles Pmus(t)] of a patient under ventilatory support may be continuously assessed with the help of a model of the passive respiratory system updated cycle by cycle. Inspiratory activity (IA) is considered present when Pmus goes below a given threshold. In six patients, we compared IA with (i) inspiratory activity (IAref) obtained from esophageal pressure and diaphragmatic EMG and (ii) that (IAvent) detected by the ventilator. In any case, a ventilator support onset coincides with an IA onset but the opposite is not true. IA onset is always later than IAref beginning ((0.21 +/- 0.10 s) and IA end always precedes IAref end (0.46 +/- 0.16 s). These results clearly deteriorate when the model is not updated. |
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Keywords: | breathing mechanical ventilation model respiration ventilation mécanique modèle |
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