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Volume 3 Supplement 1


  • Poster presentation
  • Open Access

Radiological signs of pulmonary congestion do not predict failed spontaneous breathing trial

  • 1, 2, 3,
  • 3,
  • 2, 3,
  • 2, 3,
  • 3 and
  • 1
Intensive Care Medicine Experimental20153 (Suppl 1) :A1007

  • Published:


  • Chronic Obstructive Pulmonary Disease
  • Radiological Sign
  • Systolic Heart Failure
  • Pulmonary Congestion
  • Spontaneous Breathing Trial


Both delayed and premature liberation from mechanical ventilation (MV) are associated with increased morbimortality. Positive pressure ventilation exerts beneficial effects in individuals with cardiogenic pulmonary edema; inspiratory fall in intra-thoracic pressure during spontaneous breathing trial (SBT), in its turn, may precipitate cardiac dysfunction through abrupt increase in venous return and in left ventricular afterload.


Determine the impact of radiological signs of pulmonary congestion prior to submission to SBT on weaning outcomes in a mixed ICU population.


A prospective, observational study in an adult medical-surgical ICU. All enrolled patients met eligibility criteria for weaning from MV. Traqueostomized subjects were excluded. The primary end point was SBT failure, defined as inability to tolerate a T-piece trial during 30 to 120 minutes, in which case patient was not extubated. An attending radiologist applied a radiological score (RS)


There was a total of 170 SBTs procedures; SBT failure eventuated in 28 (16.4%). Nineteen patients (11.2%) had systolic heart failure (ejection fraction < 35%), 4 (2.4%) had chronic obstructive pulmonary disease (COPD) and 31 (18.2%) had been intubated due to respiratory sepsis. One hundred thirty-three patients (78.3%) were extubated at first attempt. RS was similar between SBT failure and success subjects (median 3 [2 - 4] vs 3 [2 - 4], p = 0.146), which means only intersticial lung congestion for both groups. Receiver operating characteristic (ROC) curves analysis demonstrated fail accuracy (area under curve [AUC] = 0.58) of CXRs prior to T-piece trial for discrimination between SBT failure and success individuals. There was no correlation between fluid balance in the 48 hours preceding SBT and RS (ρ = -0.13).


Radiological findings of pulmonary congestion should not delay SBT indication since they did not predict greater probability of SBT failure in medical-surgical critically ill population.

Figure 1

Authors’ Affiliations

Universidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Ciências Pneumológicas, Porto Alegre, Brazil
Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil
Hospital Moinhos de Vento, Porto Alegre, Brazil


  1. Shochat M, Shotan A, Trachtengerts V, Blondheim DS, Kazatsker M, Gurovich V, Asif A, Shochat I, Rozenman Y, Meisel SR: A novel radiological score to assess lung fluid content during evolving acute heartfailure in the course of acute myocardial infarction. Acute Card Care. 2011, 13 (2): 81-6. 10.3109/17482941.2011.567279. Jun;PubMedView ArticleGoogle Scholar


© Antonio et al.; 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.