Determinants of weaning success in patients with prolonged mechanical ventilation View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2009-06

AUTHORS

Annalisa Carlucci, Piero Ceriana, Georgios Prinianakis, Francesco Fanfulla, Roberto Colombo, Stefano Nava

ABSTRACT

INTRODUCTION: Physiological determinants of weaning success and failure are usually studied in ventilator-supported patients, comparing those who failed a trial of spontaneous breathing with those who tolerated such a trial and were successfully extubated. A major limitation of these studies was that the two groups may be not comparable concerning the severity of the underlying disease and the presence of comorbidities. In this physiological study, we assessed the determinants of weaning success in patients acting as their own control, once they are eventually liberated from the ventilator. METHODS: In 30 stable tracheotomised ventilator-dependent patients admitted to a weaning center inside a respiratory intensive care unit, we recorded the breathing pattern, respiratory mechanics, inspiratory muscle function, and tension-time index of diaphragm (TTdi = Pdisw/Pdimax [that is, tidal transdiaphragmatic pressure over maximum transdiaphragmatic pressure] x Ti/Ttot [that is, the inspiratory time over the total breath duration]) at the time of weaning failure (T0). The measurements were repeated in all the patients (T1) either during a successful weaning trial (successful weaning [SW] group, n = 16) or 5 weeks later, in the case of repeated weaning failure (failed weaning [FW] group, n = 14). RESULTS: Compared to T0, in the FW group at T1, significant differences were observed only for a reduction in spontaneous breathing frequency and in TTdi (0.21 +/- 0.122 versus 0.14 +/- 0.054, P = 0.008). SW patients showed a significant increase in Pdimax (34.9 +/- 18.9 cm H2O versus 43.0 +/- 20.0, P = 0.02) and decrease in Pdisw/Pdimax (36.0% +/- 15.8% versus 23.1% +/- 7.9%, P = 0.004). CONCLUSIONS: The recovery of an inadequate inspiratory muscle force could be the major determinant of 'late' weaning success, since this allows the patients to breathe far below the diaphragm fatigue threshold. More... »

PAGES

r97

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/cc7927

DOI

http://dx.doi.org/10.1186/cc7927

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1007573424

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/19549301


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49 schema:description INTRODUCTION: Physiological determinants of weaning success and failure are usually studied in ventilator-supported patients, comparing those who failed a trial of spontaneous breathing with those who tolerated such a trial and were successfully extubated. A major limitation of these studies was that the two groups may be not comparable concerning the severity of the underlying disease and the presence of comorbidities. In this physiological study, we assessed the determinants of weaning success in patients acting as their own control, once they are eventually liberated from the ventilator. METHODS: In 30 stable tracheotomised ventilator-dependent patients admitted to a weaning center inside a respiratory intensive care unit, we recorded the breathing pattern, respiratory mechanics, inspiratory muscle function, and tension-time index of diaphragm (TTdi = Pdisw/Pdimax [that is, tidal transdiaphragmatic pressure over maximum transdiaphragmatic pressure] x Ti/Ttot [that is, the inspiratory time over the total breath duration]) at the time of weaning failure (T0). The measurements were repeated in all the patients (T1) either during a successful weaning trial (successful weaning [SW] group, n = 16) or 5 weeks later, in the case of repeated weaning failure (failed weaning [FW] group, n = 14). RESULTS: Compared to T0, in the FW group at T1, significant differences were observed only for a reduction in spontaneous breathing frequency and in TTdi (0.21 +/- 0.122 versus 0.14 +/- 0.054, P = 0.008). SW patients showed a significant increase in Pdimax (34.9 +/- 18.9 cm H2O versus 43.0 +/- 20.0, P = 0.02) and decrease in Pdisw/Pdimax (36.0% +/- 15.8% versus 23.1% +/- 7.9%, P = 0.004). CONCLUSIONS: The recovery of an inadequate inspiratory muscle force could be the major determinant of 'late' weaning success, since this allows the patients to breathe far below the diaphragm fatigue threshold.
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