Classification systems of acute appendicitis as an indicator for paediatric surgical consultation of children with acute abdominal pain.

Aim: This study examined if the classification systems for acute appendicitis could be applied in the emergency department as an indicator for surgical consultation, in order to reduce unnecessary paediatric surgery admission.

Methods: The Alvarado Score (ALS) and the Pediatric Appendicitis Score (PAS) were applied. The decisions for hospitalisation and treatment were made independent of the scores.

Results: In total, 307 children with abdominal pain suggestive of acute appendicitis were included. We used a cut-off point of 7 and divided the patients into groups; the group with score ≥ 7 points was considered the positive ALS and/or PAS group, and the group with score < 7 points was the negative ALS and/or PAS group. The same process for cut-values set at 6 points was followed. The joint probabilities for the 7-point-thresholds were: ALS-sensitivity 84%, PAS-sensitivity 85%, ALS-specificity 92%, PAS-specificity 92%, ALS-positive predictive value (PPV) 83%, PAS-PPV 84% and 93% negative predictive value (NPV) for both scores. Considering the 6-point-thresholds, we estimated: 94% sensitivity for both scores, 74% ALS-specificity, 84% PAS-specificity, 66% ALS-PPV, 73% PAS-PPV, 91% ALS-NPV and 97% PAS-NPV.

Conclusion: The scoring systems provided acceptable prediction of patients with and without appendicitis. They may be of use in the emergency department, as assistive diagnostic-tools, in order to reduce paediatric surgery consultations, admissions and treatment costs.