Predictors for Acute Appendicitis in Children.

Area of Science:

• Pediatric Emergency Medicine
• Diagnostic Imaging
• Surgical Pathology

Background:

• Acute appendicitis is a common pediatric emergency.
• Discrepancies in diagnosing appendicitis can occur even when the appendix is visualized on ultrasound (US).
• Secondary US findings aid in evaluating children with suspected appendicitis.

Purpose of the Study:

• To identify specific ultrasound findings and laboratory results predictive of appendicitis in children with a visualized appendix.
• To improve diagnostic accuracy for pediatric appendicitis.

Main Methods:

• Prospective study of children (0-18 years) with suspected appendicitis.
• Analysis of ultrasound findings including appendix diameter, compressibility, vascularity, appendicolith, inflammatory changes, periappendiceal fluid, and tenderness.
• Diagnosis confirmed by surgical pathology.

Main Results:

• Of 1252 patients, 762 had visualized appendices; 35.2% were diagnosed with appendicitis.
• Appendix diameter ≥7 mm (OR 12.4), appendicolith (OR 3.9), inflammatory changes (OR 10.2), and WBC count ≥10,000/μL (OR 4.8) significantly increased appendicitis likelihood.
• Abdominal pain duration ≥3 days decreased likelihood (OR 0.3).
• Absence of inflammatory changes, WBC <10,000/μL, and appendix diameter ≤7 mm had 100% negative predictive value.

Conclusions:

• In cases of suspected appendicitis with a visualized appendix, specific US findings and lab results are crucial.
• The absence of inflammatory changes, a WBC count <10,000/μL, and an appendix diameter ≤7 mm strongly suggest against appendicitis.
• These negative findings can help decrease suspicion and potentially avoid unnecessary interventions.