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Risk Analysis Index Versus mFI-5 for Predicting Outcomes After Uvulopalatopharyngoplasty.

Akshay Warrier1, Ariana Shaari2, Aman M Patel1

  • 1Department of Otolaryngology-Head and Neck Surgery, Rutgers New Jersey Medical School, Newark, New Jersey, USA.

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|April 16, 2026
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Summary

The Risk Analysis Index (RAI) better predicts postoperative complications and mortality in patients undergoing uvulopalatopharyngoplasty (UPPP) than the modified frailty index-5 (mFI-5). RAI enhances risk stratification for sleep surgery, improving perioperative planning.

Keywords:
frailtymodified frailty index‐5obstructive sleep apneapostoperative complicationsrisk analysis indexsurgical outcomesuvulopalatopharyngoplasty

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Area of Science:

  • Sleep surgery outcomes research
  • Surgical risk stratification methodologies
  • Patient frailty assessment

Background:

  • Current uvulopalatopharyngoplasty (UPPP) risk assessment lacks physiological reserve evaluation.
  • Anatomical and disease severity measures do not fully predict postoperative vulnerability.
  • Need for improved preoperative risk stratification in sleep surgery.

Purpose of the Study:

  • Compare the predictive performance of the Risk Analysis Index (RAI) and the modified frailty index-5 (mFI-5).
  • Evaluate RAI and mFI-5 in stratifying postoperative risk after UPPP.
  • Determine the optimal tool for preoperative risk assessment in UPPP patients.

Main Methods:

  • Retrospective analysis of 2129 adult UPPP patients (2005-2020).
  • Assessment of frailty using RAI and mFI-5.
  • Multivariable regression and ROC analysis for predicting complications, length of stay, discharge, and mortality.

Main Results:

  • Severe frailty (RAI > 31) strongly predicted adverse outcomes (CD II, CD IV, eLOS, NHD, DSSI).
  • RAI outperformed mFI-5 in predicting mortality (AUC 0.813 vs. 0.580) and major morbidities.
  • mFI-5 predicted some outcomes but failed to predict CD IV and DSSI in severely frail patients.

Conclusions:

  • RAI demonstrates superior predictive accuracy for mortality and major morbidity post-UPPP compared to mFI-5.
  • RAI incorporation into preoperative risk stratification for sleep surgery is recommended.
  • Improved risk assessment facilitates better perioperative planning and resource allocation.