Javier Vallejos MD, MBA, Presenter: Nothing to Disclose

Maria Eugenia Maccarone MD, Abstract Co-Author: Nothing to Disclose

Carlos Capunay MD, Abstract Co-Author: Nothing to Disclose

Marcelo Martinez Ferro, Abstract Co-Author: Nothing to Disclose

Patricia M. Carrascosa MD, Abstract Co-Author: Research Consultant, General Electric Company

To validate the new correction index (CI) to determine severity in patients with pectus excavatum and discriminate from normal patients.

Retrospective analysis of prospectively collected chest computed tomographic data in PE (N=87) and controls (N=24). We calculated HI in a standard fashion. For the CI, we drew a horizontal line across the anterior spine and measured two distances: the minimum distance between the posterior sternum and the anterior spine (D1) and the maximum distance between the line placed on the anterior spine and, the inner margin of the most anterior portion of the chest (D2). The difference between these two lines (D1 and D2) is the amount of defect the patient has in their chest. KCI formula was as follows: D2-D1/D2*100. 

The mean age did not vary between both groups (19.5±9.3 years for PE and 22±2.9 for controls, p=0.92). In the table, we illustrate the HI and CI values from our study and St. Peters et al. In our study, 10/87 (11.4%) patients with PE had overlapped with controls (area under the ROC curve 0.48, p=0.67) compared to 47% in St. Peters et al. Using the CI, only 2/87 (2.3%) patients overlapped (area under ROC curve 0.99, p<0.001), while no overlap was reported. 

The use of CI resulted in less overlap than with HI in both studies; however, overlap between PE and controls with HI depended on the baseline severity of the PE population. 

The Haller index (HI) is the most commonly used parameter to determine surgical candidacy in patients with pectus excavatum (PE). However, the use of the HI cannot discriminate between PE and normal patients. This new correction index expresses the percentage of thoracic depression represented by the sternal defect, demonstrating optimum discrimination between PE and controls. 

Vallejos, J, Maccarone, M, Capunay, C, Martinez Ferro, M, Carrascosa, P, Validation of a Novel Parameter for the Evaluation of Pectus Excavatum: The Correction Index.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14019207.html