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Diagnosis and Treatment of Acute Appendicitis

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Di Saverio et al. World Journal of Emergency Surgery (2020) 15:27 https://doi.org/10.1186/s13017-020-00306-3 REVIEW Open Access Diagnosis and treatment of acute appendicitis: 2020 update of the WSES Jerusalem guidelines Salomone Di Saverio1,2*, Mauro Podda3, Belinda De Simone4, Marco Ceresoli5, Goran Augustin6, Alice Gori7, Marja Boermeester8, Massimo Sartelli9, Federico Coccolini10, Antonio Tarasconi4, Nicola de’ Angelis11, Dieter G. Weber12, Matti Tolonen13, Arianna Birindelli14, Walter Biffl15, Ernest E. Moore16, Michael Kelly17, Kjetil Soreide18, Jeffry Kashuk19, Richard Ten Broek20, Carlos Augusto Gomes21, Michael Sugrue22, Richard Justin Davies1, Dimitrios Damaskos23, Ari Leppäniemi13, Andrew Kirkpatrick24, Andrew B. Peitzman25, Gustavo P. Fraga26, Ronald V. Maier27, Raul Coimbra28, Massimo Chiarugi10, Gabriele Sganga29, Adolfo Pisanu3, Gian Luigi de’ Angelis30, Edward Tan20, Harry Van Goor20, Francesco Pata31, Isidoro Di Carlo32, Osvaldo Chiara33, Andrey Litvin34, Fabio C. Campanile35, Boris Sakakushev36, Gia Tomadze37, Zaza Demetrashvili37, Rifat Latifi38, Fakri Abu-Zidan39, Oreste Romeo40, Helmut Segovia-Lohse41, Gianluca Baiocchi42, David Costa43, Sandro Rizoli44, Zsolt J. Balogh45, Cino Bendinelli45, Thomas Scalea46, Rao Ivatury47, George Velmahos48, Roland Andersson49, Yoram Kluger50, Luca Ansaloni51 and Fausto Catena4 Abstract Background and aims: Acute appendicitis (AA) is among the most common causes of acute abdominal pain. Diagnosis of AA is still challenging and some controversies on its management are still present among different settings and practice patterns worldwide. In July 2015, the World Society of Emergency Surgery (WSES) organized in Jerusalem the first consensus conference on the diagnosis and treatment of AA in adult patients with the intention of producing evidence-based guidelines. An updated consensus conference took place in Nijemegen in June 2019 and the guidelines have now been updated in order to provide evidence-based statements and recommendations in keeping with varying clinical practice: use of clinical scores and imaging in diagnosing AA, indications and timing for surgery, use of non- operative management and antibiotics, laparoscopy and surgical techniques, intra-operative scoring, and peri- operative antibiotic therapy. (Continued on next page) * Correspondence: [email protected]; [email protected] 1Cambridge Colorectal Unit, Cambridge University Hospitals NHS Foundation Trust, Addenbrooke’s Hospital, Cambridge Biomedical Campus, Hills Road, Cambridge CB2 0QQ, UK 2Department of General Surgery, University of Insubria, University Hospital of Varese, ASST Sette Laghi, Regione Lombardia, Varese, Italy Full list of author information is available at the end of the article © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. Di Saverio et al. World Journal of Emergency Surgery (2020) 15:27 Page 2 of 42 (Continued from previous page) Methods: This executive manuscript summarizes the WSES guidelines for the diagnosis and treatment of AA. Literature search has been updated up to 2019 and statements and recommendations have been developed according to the GRADE methodology. The statements were voted, eventually modified, and finally approved by the participants to the consensus conference and by the board of co-authors, using a Delphi methodology for voting whenever there was controversy on a statement or a recommendation. Several tables highlighting the research topics and questions, search syntaxes, and the statements and the WSES evidence-based recommendations are provided. Finally, two different practical clinical algorithms are provided in the form of a flow chart for both adults and pediatric (< 16 years old) patients. Conclusions: The 2020 WSES guidelines on AA aim to provide updated evidence-based statements and recommendations on each of the following topics: (1) diagnosis, (2) non-operative management for uncomplicated AA, (3) timing of appendectomy and in-hospital delay, (4) surgical treatment, (5) intra-operative grading of AA, (6) ,management of perforated AA with phlegmon or abscess, and (7) peri-operative antibiotic therapy. Keywords: Acute appendicitis, Appendicitis guidelines, Jerusalem guidelines, Consensus conference, Alvarado score, Appendicitis diagnosis score, Adult Appendicitis Score, Imaging, CT scan appendicitis, Non-operative management, Antibiotics, Complicated appendicitis, Appendectomy, Laparoscopic appendectomy, Diagnostic laparoscopy, Phlegmon, Appendiceal abscess Background improved by using clinical scoring systems that involve Acute abdominal pain accounts for 7–10% of all emer- physical examination findings and inflammatory gency department accesses [1]. Acute appendicitis (AA) is markers. Many simple and user-friendly scoring systems among the most common causes of lower abdominal pain have been used as a structured algorithm in order to aid leading patients to attend the emergency department and in predicting the risk of AA, but none has been widely the most common diagnosis made in young patients ad- accepted [8–10]. The role of diagnostic imaging, such as mitted to the hospital with an acute abdomen. ultrasound (US), computed tomography (CT), or mag- The incidence of AA has been declining steadily since netic resonance imaging (MRI), is another major contro- the late 1940s. In developed countries, AA occurs at a versy [11, 12]. rate of 5.7–50 patients per 100,000 inhabitants per year, Since surgeons started performing appendectomies in with a peak between the ages of 10 and 30 [2, 3]. the nineteenth century, surgery has been the most Geographical differences are reported, with a lifetime widely accepted treatment, with more than 300,000 ap- risk for AA of 9% in the USA, 8% in Europe, and 2% in pendectomies performed annually in the USA [13]. Africa [4]. Moreover, there is great variation in the pres- Current evidence shows laparoscopic appendectomy entation, severity of the disease, radiological workup, (LA) to be the most effective surgical treatment, being and surgical management of patients having AA that is associated with a lower incidence of wound infection related to country income [5]. and post-intervention morbidity, shorter hospital stay, The rate of perforation varies from 16% to 40%, with a and better quality of life scores when compared to open higher frequency occurring in younger age groups (40– appendectomy (OA) [14, 15]. 57%) and in patients older than 50 years (55–70%) [6]. Despite all the improvements in the diagnostic Appendiceal perforation is associated with increased process, the crucial decision as to whether to operate or morbidity and mortality compared with non-perforating not remains challenging. Over the past 20 years, there AA. The mortality risk of acute but not gangrenous AA has been renewed interest in the non-operative manage- is less than 0.1%, but the risk rises to 0.6% in gangrenous ment of uncomplicated AA, probably due to a more reli- AA. On the other hand, perforated AA carries a higher able analysis of postoperative complications and costs of mortality rate of around 5%. Currently, growing evidence surgical interventions, which are mostly related to the suggests that perforation is not necessarily the inevitable continuously increasing use of minimally invasive tech- result of appendiceal obstruction, and an increasing niques [16–18]. amount of evidence now suggests not only that not all The most common postoperative complications, such patients with AA will progress to perforation, but even as wound infection, intra-abdominal abscess, and ileus, that resolution may be a common event [7]. vary in frequency between OA (overall complication rate The clinical diagnosis of AA is often challenging and of 11.1%) and LA (8.7%) [19]. involves a synthesis of clinical, laboratory, and radio- In August 2013, the Organizational Board of the 2nd logical findings. The diagnostic workup could be World Congress of the World Society of Emergency Di Saverio et al. World Journal of Emergency Surgery (2020) 15:27 Page 3 of 42 Surgery (WSES) endorsed its president to organize the The search results were selected and categorized to first Consensus Conference on AA, in order to develop allow comprehensive published abstract of randomized the WSES Guidelines on this topic. The Consensus Con- clinical trials, non-randomized studies, consensus con- ference on AA was held in Jerusalem, Israel, on July 6, ferences, congress reports, guidelines, government publi- 2015, during the 3rd World Congress of the WSES,
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