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A Clinical Prediction Algorithm to Stratify Pediatric Musculoskeletal Infection by Severity

Benvenuti, Michael A., BS*; An, Thomas J., BA*; Mignemi, Megan E., MD; Martus, Jeffrey E., MD; Mencio, Gregory A., MD; Lovejoy, Stephen A., MD; Schoenecker, Jonathan G., MD, PhD†,‡,§; Williams, Derek J., MD, MPH

Journal of Pediatric Orthopaedics: March 2019 - Volume 39 - Issue 3 - p 153–157
doi: 10.1097/BPO.0000000000000880
Infection
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Objective: There are currently no algorithms for early stratification of pediatric musculoskeletal infection (MSKI) severity that are applicable to all types of tissue involvement. In this study, the authors sought to develop a clinical prediction algorithm that accurately stratifies infection severity based on clinical and laboratory data at presentation to the emergency department.

Methods: An IRB-approved retrospective review was conducted to identify patients aged 0 to 18 who presented to the pediatric emergency department at a tertiary care children’s hospital with concern for acute MSKI over a 5-year period (2008 to 2013). Qualifying records were reviewed to obtain clinical and laboratory data and to classify in-hospital outcomes using a 3-tiered severity stratification system. Ordinal regression was used to estimate risk for each outcome. Candidate predictors included age, temperature, respiratory rate, heart rate, C-reactive protein (CRP), and peripheral white blood cell count. We fit fully specified (all predictors) and reduced models (retaining predictors with a P-value ≤0.2). Discriminatory power of the models was assessed using the concordance (c)-index.

Results: Of the 273 identified children, 191 (70%) met inclusion criteria. Median age was 5.8 years. Outcomes included 47 (25%) children with inflammation only, 41 (21%) with local infection, and 103 (54%) with disseminated infection. Both the full and reduced models accurately demonstrated excellent performance (full model c-index 0.83; 95% confidence interval, 0.79-0.88; reduced model 0.83; 95% confidence interval, 0.78-0.87). Model fit was also similar, indicating preference for the reduced model. Variables in this model included CRP, pulse, temperature, and an interaction term for pulse and temperature. The odds of a more severe outcome increased by 30% for every 10 U increase in CRP.

Conclusions: Clinical and laboratory data obtained in the emergency department may be used to accurately differentiate pediatric MSKI severity. The predictive algorithm in this study stratifies pediatric MSKI severity at presentation irrespective of tissue involvement and anatomic diagnosis. Prospective studies are needed to validate model performance and clinical utility.

Level of Evidence: Level II—prognostic study.

*Vanderbilt University School of Medicine

Department of Orthopaedics, Division of Pediatric Orthopedics

Department of Pediatrics, Division of Hospital Medicine

Department of Pharmacology

§Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN

M.A.B. and T.J.A. contributed equally.

Supported in part by the National Institute of Allergy and Infectious Diseases of the National Institutes of Health under Award Number K23AI104779 to D.J.W. In addition, this work was supported in part by a P.O.S.N.A. Research Grant to J.G.S. The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the National Institutes of Health or P.O.S.N.A. The other authors have no financial disclosures relevant to this work.

The authors declare no conflicts of interest.

Reprints: Derek J. Williams, MD, MPH, Department of Pediatrics, Division of Hospital Medicine, Vanderbilt University Medical Center, 1161 21st Ave. S. S2323 Medical Center North, Nashville, TN 37232. E-mail: derek.williams@vanderbilt.edu.

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