Measurement of the pectus severity index and pectus correction index for pectus excavatum

Calculations:

Pectus severity index (PSI) = A/B
Pectus correction index (PCI) = 100 × (C – B)/C

Either PSI ≥3.25 or PCI ≥28% have been used as a threshold for surgical correction. These measures are correlated, but PCI may be superior to PSI as a measure of pectus deformity in individuals with nonstandard chests, ie, those with unusually broad or narrow chests^[1].

PSI: pectus severity index (also known as the Haller index); PCI: pectus correction index.

Reference:

Poston PM, Patel SS, Rajput M, et al. The correction index: Setting the standard for recommending operative repair of pectus excavatum. Ann Thorac Surg 2014; 97:1176.

Courtesy of Oscar H Mayer, MD.

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Measurement of the pectus severity index and pectus correction index for pectus excavatum