A novel non-invasive method to detect excessively high respiratory effort and dynamic transpulmonary driving pressure during mechanical ventilation
Michele Bertoni, Irene Telias, Martin Urner, Michael Long, Lorenzo Del Sorbo, Eddy Fan, Christer Sinderby, Jennifer Beck, Ling Liu, Haibo Qiu, Jenna Wong, Arthur S Slutsky, Niall D Ferguson, Laurent J Brochard, Ewan C Goligher, Michele Bertoni, Irene Telias, Martin Urner, Michael Long, Lorenzo Del Sorbo, Eddy Fan, Christer Sinderby, Jennifer Beck, Ling Liu, Haibo Qiu, Jenna Wong, Arthur S Slutsky, Niall D Ferguson, Laurent J Brochard, Ewan C Goligher
Abstract
Background: Excessive respiratory muscle effort during mechanical ventilation may cause patient self-inflicted lung injury and load-induced diaphragm myotrauma, but there are no non-invasive methods to reliably detect elevated transpulmonary driving pressure and elevated respiratory muscle effort during assisted ventilation. We hypothesized that the swing in airway pressure generated by respiratory muscle effort under assisted ventilation when the airway is briefly occluded (ΔPocc) could be used as a highly feasible non-invasive technique to screen for these conditions.
Methods: Respiratory muscle pressure (Pmus), dynamic transpulmonary driving pressure (ΔPL,dyn, the difference between peak and end-expiratory transpulmonary pressure), and ΔPocc were measured daily in mechanically ventilated patients in two ICUs in Toronto, Canada. A conversion factor to predict ΔPL,dyn and Pmus from ΔPocc was derived and validated using cross-validation. External validity was assessed in an independent cohort (Nanjing, China).
Results: Fifty-two daily recordings were collected in 16 patients. In this sample, Pmus and ΔPL were frequently excessively high: Pmus exceeded 10 cm H2O on 84% of study days and ΔPL,dyn exceeded 15 cm H2O on 53% of study days. ΔPocc measurements accurately detected Pmus > 10 cm H2O (AUROC 0.92, 95% CI 0.83-0.97) and ΔPL,dyn > 15 cm H2O (AUROC 0.93, 95% CI 0.86-0.99). In the external validation cohort (n = 12), estimating Pmus and ΔPL,dyn from ΔPocc measurements detected excessively high Pmus and ΔPL,dyn with similar accuracy (AUROC ≥ 0.94).
Conclusions: Measuring ΔPocc enables accurate non-invasive detection of elevated respiratory muscle pressure and transpulmonary driving pressure. Excessive respiratory effort and transpulmonary driving pressure may be frequent in spontaneously breathing ventilated patients.
Keywords: Acute lung injury; Artificial respiration; Mechanical ventilation; Myotrauma; Respiratory monitoring.
Conflict of interest statement
Dr. Goligher’s laboratory receives support in the form of equipment from Getinge, and Dr. Goligher has received speaking honoraria from Getinge. The other authors declare that they have no competing interests.
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Source: PubMed