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  • Poster presentation
  • Open Access

A radiological visual scale to predict the potentially recruitable lung in ALI/ARDS patients

  • 1,
  • 1,
  • 2,
  • 2,
  • 2,
  • 1,
  • 1 and
  • 1
Critical Care201115 (Suppl 1) :P205

  • Published:


  • Carbon Dioxide
  • Lung Tissue
  • Interquartile Range
  • Airway Pressure
  • Scale Analysis


In ALI/ARDS patients the amount of potentially recruitable lung is extremely variable and it is poorly predictable by the changes of oxygenation, carbon dioxide or compliance during a PEEP trial [1]. At the present time the gold standard to compute the lung recruitability is the quantitative lung CT scan, in which each lung image, after being manually drawn, is analyzed by dedicated software. However, this is both a laborious and time-consuming technique. The aim of this study was to evaluate the ability of a visual radiological scale compared with lung CT scan analysis to predict the lung recruitability in ALI/ARDS patients.


A whole lung CT scan was performed at 5 and 45 cmH2O airway pressure. For CT scan analysis each lung image was manually outlined and analyzed by a dedicated software. The potentially recruitable lung was defined as the proportion of the nonaerated lung tissue in which aeration was restored [1]. For radiological visual scale analysis, two radiologists performed a blinded evaluation of the consolidation/collapsed areas in each lobe by visual inspection [2]. The overall lung change in consolidation/collapsed was obtained by the sum of each lobe and computed as the difference between the two conditions.


Twenty-four ALI/ARDS patients (age 59 ± 15 years, BMI 26 ± 4 kg/m2, PaO2/FiO2 170 ± 60, PEEP 10 ± 2 cmH2O) were enrolled. The percentage of potentially recruitable lung was 16.2 ± 7.1% and 14.7 ± 7.0%, computed by CT scan and by the visual radiological scale, respectively. The mean difference between CT scan analysis and visual radiological analysis was 3.3 ± 4.6% (median: 2.91, interquartile range: 0.38 to 6.56). The error of the visual method was lower than 5% in 14 patients (58.3%), between 5% and 10% in eight patients (33.3%) and between 10% and 15% in two patients (8.3%).


The application of a radiological visual scale is able to predict the amount of potentially recruitable lung similarly to those obtained by a dedicated software avoiding the need of manually drawing each lung image.

Authors’ Affiliations

Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico, Milan, Italy
Università degli Studi di Milano, Milan, Italy


  1. Gattinoni L, et al.: N Engl J Med. 2006, 354: 1775-1786.View ArticlePubMedGoogle Scholar
  2. Pierce RJ, et al.: Thorax. 1980, 35: 773-780.PubMed CentralView ArticlePubMedGoogle Scholar


© Chiumello et al. 2011

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.