External validation of the breast reconstruction risk assessment calculator

Nima Khavanin, Cecil S. Qiu, Alexei S. Mlodinow, Michael M. Vu, Robert G. Dorfman, Neil A. Fine, John Y.S. Kim*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Introduction The Breast reconstruction Risk Assessment (BRA) Score estimates patient-specific risk for postsurgical complications using an individual's unique combination of preoperative variables. In this report, we externally validate the BRA Score models for surgical site infection, seroma, and explantation in a large sample of intra-institutional patients who underwent prosthetic breast reconstruction. Methods We reviewed all initiated tissue expander/implant reconstructions by the senior authors from January 2004 to December 2015. BRA Score risk estimates were computed for each patient and compared against observed rates of complications. Hosmer–Lemeshow goodness-of-fit test, concordance statistic, and Brier score were used to assess the calibration, discrimination, and accuracy of the models, respectively. Results Of the 1152 patients (1743 breasts) reviewed, 855 patients (1333 breasts) had complete data for BRA-score calculations and were included for analysis. Hosmer–Lemeshow tests for calibration demonstrated a good agreement between observed and predicted outcomes for surgical site infection (SSI) and seroma models (P-values of 0.33 and 0.16, respectively). In contrast, predicted rates of explantation deviated from observed rates (Hosmer–Lemeshow P-value of 0.04). C statistics demonstrated good discrimination for SSI, seroma, and explantation (0.73, 0.69, and 0.78, respectively). Conclusions In this external validation study, the BRA Score tissue expander/implant reconstruction models performed with generally good calibration, discrimination, and accuracy. Some weaknesses in certain models were identified as targets for future improvement. Taken together, these analyses validate the clinical utility of the BRA score risk models in predicting 30-day outcomes.

Original languageEnglish (US)
Pages (from-to)876-883
Number of pages8
JournalJournal of Plastic, Reconstructive and Aesthetic Surgery
Volume70
Issue number7
DOIs
StatePublished - Jul 2017

Keywords

  • Breast reconstruction
  • Explantation
  • Seroma
  • Surgical site infection
  • Tissue expander
  • Validation

ASJC Scopus subject areas

  • Surgery

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