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MICRO: Microsurgical Index for Complication Risk and Outcomes.

Thomas M Johnstone1,2, Daniel Najafali1,3, Priscila C Cevallos1,4

  • 1Division of Plastic & Reconstructive Surgery, Department of Surgery, Stanford University School of Medicine, Palo Alto, California.

Journal of Reconstructive Microsurgery
|April 7, 2025
PubMed
Summary
This summary is machine-generated.

A new tool, the Microsurgical Index for Complication Risk and Outcomes (MICRO), predicts complications after free tissue transfer (FTT). This index offers a simpler, more accurate way to assess patient risk compared to existing methods.

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Area of Science:

  • Plastic Surgery
  • Microsurgery
  • Health Informatics

Background:

  • Free tissue transfer (FTT) outcomes are influenced by numerous patient and surgeon factors.
  • Currently, no validated tool exists to quantify patient-specific risks for complications following FTT procedures.
  • Existing comorbidity indexes lack specificity for predicting FTT complications.

Purpose of the Study:

  • To develop and validate a novel risk assessment tool, the Microsurgical Index for Complication Risk and Outcomes (MICRO), for predicting postoperative complications after FTT.
  • To compare the predictive performance of the MICRO against established comorbidity indexes.

Main Methods:

  • Retrospective analysis of 5,595 patients undergoing FTT with microsurgical anastomosis from the 2007-2015 MarketScan Databases.
  • Development of the MICRO using forward stepwise selection from Elixhauser comorbidities, incorporating expert input.
  • Multivariate logistic regression models utilizing patient demographics, comorbidities, and flap type to predict 90-day postoperative complications.
  • Evaluation of predictive performance using Area Under the Receiver Operating Characteristic Curve (AUROCC) and cross-validation accuracy.

Main Results:

  • The final MICRO comprises seven variables, outperforming existing comorbidity indexes.
  • The MICRO achieved an AUROCC of 0.60 and a classification accuracy of 60.4% in predicting complications.
  • The developed index demonstrated superior predictive capability with a reduced number of variables compared to Charlson and Elixhauser indexes.

Conclusions:

  • The MICRO is a validated, concise tool that effectively predicts complications following free tissue transfer.
  • It offers a significant improvement over existing comorbidity indexes for risk stratification in FTT patients.
  • Future research should aim to enhance the MICRO by integrating surgeon and site-specific data for more precise risk assessment.