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The 5-factor modified frailty index (mFI-5) is predictive of 30-day postoperative complications and readmission in patients with adult spinal deformity (ASD)

      Highlights

      • Little literature assesses mFI-5 as a predictor for outcomes in ASD patients.
      • An mFI-5 score of 1 or 2 was associated with 30-day reoperations.
      • An mFI-5 score of 1 or 2 was associated with 30-day related and any readmissions.
      • This supports mFI-5 as a possible predictor for adverse postoperative outcomes.

      Abstract

      Background

      There is limited research regarding the association between the mFI-5 and postoperative complications among adult spinal deformity (ASD) patients.

      Methods

      Using the National Surgical Quality Improvement Project (NSQIP) database, patients with Current Procedural Terminology (CPT) codes for > 7-level fusion or < 7-level fusion with International Classification of Diseases, Ninth Revision (ICD-9) codes for ASD were identified between 2008 and 2016. Univariate analyses with post-hoc Bonferroni correction for demographics and preoperative factors were performed. Logistic regression assessed associations between mFI-5 scores and 30-day post-operative outcomes.

      Results

      2,120 patients met criteria. Patients with an mFI-5 score of 4 or 5 were excluded, given there were<20 patients with those scores. Patients with mFI-5 scores of 1 and 2 had increased 30-day rates of pneumonia (3.5 % and 4.3 % vs 1.6 %), unplanned postoperative ventilation for > 48 h (3.1 % and 4.3 % vs 0.9 %), and UTIs (4.4 % and 7.4 % vs 2.0 %) than patients with a score of 0 (all, p < 0.05). Logistic regression revealed that compared to an mFI-5 of 0, a score of 1 was an independent predictor of 30-day reoperations (OR = 1.4; 95 % CI 1.1–18). A score of 2 was an independent predictor of overall (OR = 2.4; 95 % CI 1.4–4.1) and related (OR = 2.2; 95 % CI 1.2–4.1) 30-day readmissions. A score of 3 was not predictive of any adverse outcome.

      Conclusion

      The mFI-5 score predicted complications and postoperative events in the ASD population. The mFI-5 may effectively predict 30-day readmissions. Further research is needed to identify the benefits and predictive value of mFI-5 as a risk assessment tool.

      Keywords

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