title: [Evaluation of diagnostic scales for appendicitis in patients with lower abdominal pain].
abstract: BACKGROUND
  Diagnosis of apendicitis is difficult; however several clinical scales have been developed that attempt to improve diagnostic accuracy.
  
  
  OBJECTIVE
  The operational characteristics of Alvarado and Fenyö scales were defined in patients with abdominal pain suggestive of appendicitis and were compare with clinical and pathological diagnoses.
  
  
  METHODS
  A prospective trial assessed the diagnostic tests. Sign, symptoms, and laboratory tests were included in scales selected. Surgeon decision was maintained independent from the results of the scales. Sensitivity, specificity, positive and negative predictive value and positive and negative likelihood ratio for each scale was compared with the surgeon evaluation.
  
  
  RESULTS
  The sample included 374 patients with approximately equal sexes. Of these 269 patients underwent surgery. Howeve, 16.9% of the male and 31.4% of female patients did not have appendicitis. For men, a diagnosis made by the surgeon had better sensitivity than scales (86.2% vs. 73% for Alvarado and 67.2% for Fenyö) without significant differences in specificity. For women, surgeon and Alvarado scale diagnoses were similar, and better than Fenyö scale (77.1% vs. 79.5% for Alvarado and 47% for Fenyö), but specificity was higher for Fenyö scale (92.9% vs. 71.4% for Alvarado and 75.9% for surgeon). Accuracy in diagnosis of appendicitis increases with a higher Alvarado score.
  
  
  CONCLUSIONS
  For men with abdominal pain on right lower quadrant, surgeon diagnosis is more accurate than scales. For women, Fenyö scale offers a better sensitivity. Alvarado score can facilitate decision-making in patients with these abdominal symptoms.
authors.affiliation: Departamento de Cirugía, Universidad de La Sabana, Cundinamarca, Colombia. alvarosanabria@gmail.com
authors.forename: Alvaro
authors.initials: A
authors.lastname: Sanabria
authors.forename: Luis Carlos
authors.initials: LC
authors.lastname: Domínguez
authors.forename: Charles
authors.initials: C
authors.lastname: Bermúdez
authors.forename: Adriana
authors.initials: A
authors.lastname: Serna
mesh_terms: D015746:Abdominal Pain / Q000175:diagnosis* / Q000209:etiology / Q000601:surgery; D001064:Appendicitis / Q000175:diagnosis* / Q000601:surgery; D003951:Diagnostic Errors; D003938:Diagnostic Techniques, Digestive System; D005260:Female; D006801:Humans; D008297:Male; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity