Diagnostic prediction of complicated appendicitis by combined clinical and radiological appendicitis severity index (APSI)

TY - JOUR

T1 - Diagnostic prediction of complicated appendicitis by combined clinical and radiological appendicitis severity index (APSI)

AU - Avanesov, Maxim

AU - Wiese, Nis Jesper

AU - Karul, Murat

AU - Guerreiro, Helena

AU - Keller, Sarah

AU - Busch, Philip

AU - Jacobsen, Frank

AU - Adam, Gerhard

AU - Yamamura, Jin

PY - 2018/9

Y1 - 2018/9

N2 - OBJECTIVES: To develop a routinely applicable severity index for the management of acute appendicitis in adults using combined clinical and radiological parameters and retroperitoneal space planes (RSP).METHODS: Two hundred consecutive patients with histologically proven acute appendicitis and available presurgical CT scans were analysed retrospectively. Two radiologists assessed all CT scans for morphologic sings of appendicitis and six RSP. Clinical parameters were age, body temperature, C-reactive protein (CRP), white blood cell count, and duration of symptoms. Radiological parameters were appendix diameter and wall thickness, periappendiceal fat stranding and fluid, intraluminal and extraluminal air, thinning of appendiceal wall, caecal wall thickening, appendicolith and abscess formation.RESULTS: One hundred and three patients (51%) had histologically proven complicated appendicitis. Based on three clinical (age ≥52 years, body temperature ≥37.5°C, duration of symptoms ≥48 h) and four computed tomography (CT) findings (appendix diameter ≥14 mm, presence of periappendiceal fluid, extraluminal air, perityphlitic abscess), the APSI was developed using regression coefficients of multivariate logistic regression analyses with a maximum of 10 points. A score of ≥4 points predicted complicated appendicitis with a positive predictive value of 92% and a negative predictive value of 83%. Substantial to excellent interobserver agreement was found for the four radiological parameters of the APSI [intraclass correlation coefficient (ICC), 0.78-0.83]. The RSP evaluation presented no added value for the diagnosis of complicated appendicitis.CONCLUSIONS: Using APSI, an accurate and simple prediction of complicated appendicitis in adults was possible. The RSP count was not useful for the diagnosis of complicated appendicitis.KEY POINTS: • Appendicitis severity score provides an accurate and simple prediction of complicated appendicitis • Appendicitis severity score ≥4 accurately predicted complicated appendicitis (PPV 92%;NPV 83%) • Evaluation of retroperitoneal space planes was not useful in diagnosing complicated appendicitis.

AB - OBJECTIVES: To develop a routinely applicable severity index for the management of acute appendicitis in adults using combined clinical and radiological parameters and retroperitoneal space planes (RSP).METHODS: Two hundred consecutive patients with histologically proven acute appendicitis and available presurgical CT scans were analysed retrospectively. Two radiologists assessed all CT scans for morphologic sings of appendicitis and six RSP. Clinical parameters were age, body temperature, C-reactive protein (CRP), white blood cell count, and duration of symptoms. Radiological parameters were appendix diameter and wall thickness, periappendiceal fat stranding and fluid, intraluminal and extraluminal air, thinning of appendiceal wall, caecal wall thickening, appendicolith and abscess formation.RESULTS: One hundred and three patients (51%) had histologically proven complicated appendicitis. Based on three clinical (age ≥52 years, body temperature ≥37.5°C, duration of symptoms ≥48 h) and four computed tomography (CT) findings (appendix diameter ≥14 mm, presence of periappendiceal fluid, extraluminal air, perityphlitic abscess), the APSI was developed using regression coefficients of multivariate logistic regression analyses with a maximum of 10 points. A score of ≥4 points predicted complicated appendicitis with a positive predictive value of 92% and a negative predictive value of 83%. Substantial to excellent interobserver agreement was found for the four radiological parameters of the APSI [intraclass correlation coefficient (ICC), 0.78-0.83]. The RSP evaluation presented no added value for the diagnosis of complicated appendicitis.CONCLUSIONS: Using APSI, an accurate and simple prediction of complicated appendicitis in adults was possible. The RSP count was not useful for the diagnosis of complicated appendicitis.KEY POINTS: • Appendicitis severity score provides an accurate and simple prediction of complicated appendicitis • Appendicitis severity score ≥4 accurately predicted complicated appendicitis (PPV 92%;NPV 83%) • Evaluation of retroperitoneal space planes was not useful in diagnosing complicated appendicitis.

KW - Abscess

KW - Acute Disease

KW - Adolescent

KW - Adult

KW - Aged

KW - Aged, 80 and over

KW - Appendicitis

KW - Appendix

KW - Biomarkers

KW - C-Reactive Protein

KW - Female

KW - Humans

KW - Leukocyte Count

KW - Male

KW - Middle Aged

KW - Observer Variation

KW - Predictive Value of Tests

KW - Retroperitoneal Space

KW - Retrospective Studies

KW - Severity of Illness Index

KW - Tomography, X-Ray Computed

KW - Young Adult

KW - Journal Article

U2 - 10.1007/s00330-018-5339-9

DO - 10.1007/s00330-018-5339-9

M3 - SCORING: Journal article

C2 - 29541911

VL - 28

SP - 3601

EP - 3610

JO - EUR RADIOL

JF - EUR RADIOL

SN - 0938-7994

IS - 9

ER -