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Revista Brasileira de Terapia Intensiva

Print version ISSN 0103-507XOn-line version ISSN 1982-4335


ANTONIO, Ana Carolina Peçanha et al. Behavior of lung ultrasound findings during spontaneous breathing trial. Rev. bras. ter. intensiva [online]. 2017, vol.29, n.3, pp.279-286.  Epub Aug 21, 2017. ISSN 0103-507X.


We aimed to investigate a potential association between B-lines and weaning failure.


Fifty-seven subjects eligible for ventilation liberation were enrolled. Patients with tracheostomy were excluded. Lung ultrasound assessments of six thoracic zones were performed immediately before and at the exnd of the spontaneous breathing trial. B-predominance was defined as any profile with anterior bilateral B-pattern. Patients were followed up to 48 hours after extubation.


Thirty-eight individuals were successfully extubated; 11 failed the spontaneous breathing trial and 8 needed reintubation within 48 hours of extubation. At the beginning of the T-piece trial, B-pattern or consolidation was already found at the lower and posterior lung regions in more than half of the individuals and remained non-aerated at the end of the trial. A trend toward loss of lung aeration during spontaneous breathing trials was observed only in the spontaneous breathing trial-failure group (p = 0.07), and there was higher B-predominance at the end of the trial (p = 0.01).


A loss of lung aeration during the spontaneous breathing trial in non-dependent lung zones was demonstrated in subjects who failed to wean.

Keywords : Ventilator weaning; Respiration, artificial; Ultrasonography; Respiratory failure; Pulmonary edema.

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