Validación del diagnóstico ecográfico de apendicitis aguda en el Hospital José Carrasco Arteaga

Abstract

Acute appendicitis, acute inflammatory process of the vermiform appendix is the most common cause of acute abdominal pain in some series reaching up to 50% -60% of cases. The diagnosis is clinical. Ultrasound has a sensitivity of 76% and a specificity of 66% is applicable when clinical signs and laboratory findings have not made the diagnosis. Goal To determine the diagnostic validity of ultrasound in the diagnosis of acute appendicitis in Hospital Emergency Department Jose Carrasco Arteaga (HJCA). Materials and methods We performed a validation of a diagnostic test that compared patients with ultrasound ultrasound diagnosis of acute appendicitis with the result of pathology of the removed appendix as a gold. For the sample used a sensitivity of 76% and a specificity of 66% confidence level 95%, 80% power, for a total of 531 patients. We applied a questionnaire to identify sex, age, duration and site of pain, sonography was performed using the NEMI team multifrequency linear array transducer of 7 to 9 MHz. For the analysis we used Excel 2010 and SPSS 19. Results The mean age was 31.73 years. Most affected were the teenagers and young adults about sex were men. The target image ultrasonographic sign was the major finding (44.6%). 364 were true positives, 46 true negatives, 6 false positives and false negatives 118. We obtained a sensitivity of 75.5%, specificity 88.4%, positive predictive value of 98% negative predictive value of 28%. The overall effectiveness of the test was 76.8%.