Disconnect between incidence of nonperforated and perforated appendicitis: implications for pathophysiology and management

Changes in Incidence and Management of Acute Appendicitis in Children-A Population-Based Study in the Period 2000-2015

INTRODUCTION

 Recent studies suggest that the epidemiology and management of appendicitis have changed during the last decades. The purpose of this population-based study was to examine this in the pediatric population in Denmark.

MATERIALS AND METHODS

 Data were retrieved from the Danish National Patient Registry, the Danish Civil Registration System, and the Statbank Denmark. Patients aged 0 to 17 years diagnosed with appendicitis and appendectomized during the period 2000 to 2015 were included. The primary outcome was the annual incidences of appendicitis. Secondary outcomes were the annual percent of patients with appendicitis having a laparoscopic appendectomy, delay from admission to surgery, length of postoperative hospital stay, and 30-day postoperative mortality.

RESULTS

 A total of 24,046 pediatric cases of appendicitis were identified. The annual incidence steadily declined until 2008 (-29%, all ages) and then remained stable. The surgical approach of choice changed from being open appendectomy in 2000 (97%) to laparoscopic appendectomy in 2015 (94%). Simultaneously, the duration of postoperative hospital stay declined from 41 hours (median) to 17 hours. Delay from admission until surgery did not change during the period. Only one child died within the 30-day postoperative period.

CONCLUSION

 In accordance with other recent studies from Western countries, we found significant changes in the incidence of acute appendicitis including a decline in all age groups except those below 5 years of age, a shift toward laparoscopic appendectomy, and decreasing time spent in the hospital during the years 2000 to 2015.

Revisiting delayed appendectomy in patients with acute appendicitis

Acute appendicitis (AA) is the most common acute abdomen, and appendectomy is the most common nonelective surgery performed worldwide. Despite the long history of understanding this disease and enhancements to medical care, many challenges remain in the diagnosis and treatment of AA. One of these challenges is the timing of appendectomy. In recent decades, extensive studies focused on this topic have been conducted, but there have been no conclusive answers. From the onset of symptoms to appendectomy, many factors can cause delay in the surgical intervention. Some are inevitable, and some can be modified and improved. The favorable and unfavorable results of these factors vary according to different situations. The purpose of this review is to discuss the causes of appendectomy delay and its risk-related costs. This review also explores strategies to balance the positive and negative effects of delayed appendectomy.

Acute appendicitis is associated with appendiceal microbiome changes including elevated Campylobacter jejuni levels

OBJECTIVES

To compare the appendiceal microbiomes and examine the prevalence of Campylobacter species in the appendices of adult subjects with confirmed acute non-perforated appendicitis and controls with healthy appendices.

DESIGN

Archived samples of formalin-fixed paraffin-embedded appendiceal tissues were obtained from 50 consecutive female subjects who underwent appendectomy for acute, non-perforated appendicitis, and 35 consecutive female controls who underwent incidental appendectomy during gynaecological surgery.

RESULTS

16S rRNA gene sequencing revealed that the relative abundances (RAs) of the major phyla in appendiceal tissues (Firmicutes, Proteobacteria, Bacteroidetes, and Actinobacteria) were similar in both groups. Beta diversity was significantly different due to differences in Bacteroidetes and Proteobacteria (p<0.0001). Within Proteobacteria, RAs of classes Alphaproteobacteria (~21%, fold change (FC)=1.31, false discovery rate (FDR) p value=0.03) and Epsilonproteobacteria (~1%, FC=0.25, FDR p value>0.05) were increased in acute appendicitis samples. RAs of unknown genera from families Burkholderiaceae and Enterobacteriaceae were decreased in appendicitis samples, and 14 genera were increased, including Neisseria, Acinetobacter and Campylobacter. Quantitative PCR revealed that levels of Campylobacter jejuni DNA, but not other Campylobacter species or pathogens tested, were significantly higher in appendicitis samples than in controls (p=0.013). Using a cut-off of 0.31 pg/µL, 40% of appendicitis cases and 6% of controls were positive for C. jejuni, indicating specificity of 93.7% (95% Cl 79.2 to 99.2), sensitivity of 40.9% (95% Cl 24.7 to 54.5), and OR of 10.38 (Fisher's p value=0.0006, 95% Cl 2.3 to 47.4).

CONCLUSIONS

Our findings indicate that Campylobacter jejuni may be a significant cause of acute appendicitis. This supports earlier studies and suggests that targeted antibiotic therapies could be an alternative treatment for a subset of non-complicated acute appendicitis cases.

Levels of C-Reactive Protein and Sodium May Differentiate a Perforated Appendix from a Nonperforated Appendix in Children

Background

Acute appendicitis (AA) might be amenable to conservative antibiotic treatment, whereas a perforated appendix (PA) necessitates surgery. We investigated the value of clinical–laboratory markers in distinguishing AA from a PA.

Methods

Retrospectively obtained preoperative parameters for 306 consecutive patients (<18 years) with histologically confirmed appendicitis (AA (n = 237) vs. PA (n = 69)), treated at our institution between January 2014 and December 2017.

Results

A PA was associated with male preponderance, younger age, decreased sodium level and increased white blood cell count, Tzanakis score, C-reactive protein (CRP) level, and CRP-to-lymphocyte ratio (CLR). Upon discrimination analysis, CLR and CRP displayed the highest accuracy in differentiating a PA from AA. Regression analysis identified levels of CRP, sodium, and the Tzanakis score as independent predictors for a PA.

Conclusion

Levels of CLR, CRP, sodium, and Tzanakis score might support decision-making regarding treatment options for pediatric appendicitis.

Relative CT number of periappendiceal fat stranding may be an applicable index for estimating the severity of acute appendicitis

Objectives:

To investigate the feasibility of relative CT numbers to periappendiceal fat attenuation as an applicable index for estimating the severity of acute appendicitis.

Methods:

In total, 308 consecutive surgery-confirmed acute appendicitis patients and 243 controls with available preoperative CT were analyzed retrospectively. The radiological parameters were appendix diameter, length, and wall thickness as concurrent appendicitis signs. CT numbers of periappendiceal fat, mesenteric fat, subcutaneous fat in the anterior and posterior abdominal wall, retroperitoneal fat, gluteal subcutaneous fat and psoas major muscle were measured, as well as the relative CT numbers of periappendiceal fat compared with other locations.

Results:

There were 287 suppurative acute appendicitis (SAA) and 21 gangrenous or perforated acute appendicitis (GPAA) cases confirmed by pathology. The CT number of periappendiceal fat was significantly higher in patients than in controls (P＜0.01) although there was a wide overlap (−72.33 HU–117.43 HU). Significant differences in relative CT numbers were observed between the groups in gluteal subcutaneous fat (R_CTgl) and psoas major muscle (R_CTps) (P＜0.01). The AUCs of R_CTgl and R_CTps showed high accuracy to discriminate acute appendicitis from controls (AUC = 0.803, 0.761; 0.854, 0.847) and GPAA from SAA (AUC = 0.905, 0.851).

Conclusions:

Attenuation of periappendiceal fat on CT is related to the severity of appendicitis, and relative CT numbers (R_CTgl and R_CTps) could be an applicable index for severity determination.

Advances in knowledge:

Periappendiceal fat infiltration is related to the severity of acute appendicitis (especially relative CT number). Other clinical and CT features also need to be considered in the evaluation of inflammation.

Online educational materials for appendectomy patients have good quality but poor readability

BACKGROUND

Guidelines recommend patient health-related information be written at or below the sixth-grade level. This study evaluates the readability level and quality of online appendectomy patient education materials.

METHODS

Webpages were evaluated using seven readability formulae: Flesh-Kincaid Grade Level (FKGL), Gunning Fog Index (GFI), Coleman-Liau Index (CLI), Automated Readability Index (ARI), Simple Measure of Gobbledygook (SMOG), Flesch Reading Ease (FRE), and New Dale-Chall (NDC). Two evaluators assessed quality using the Brief DISCERN tool.

RESULTS

Thirty seven webpages were analyzed. The mean readability scores were: FKGL = 9.11, GFI = 11.82, CLI = 10.84, ARI = 7.99, SMOG = 11.88, FRE = 51.17, and NDC = 5.48. 6 of the 7 readability formulae indicate that the materials were written at too high a level. The average Brief DISCERN score was 17.81, indicating good quality.

CONCLUSIONS

Readability levels for online appendectomy patient education materials are higher than recommended but are of good quality. Authors of such materials should not only provide good quality information but also ensure readability.

Differentiation between complicated and uncomplicated appendicitis: diagnostic model development and validation study

PURPOSE

Differentiating complicated appendicitis has become important, as multiple trials showed that non-operative management of uncomplicated appendicitis is feasible. We developed and validated a diagnostic model to differentiate complicated from uncomplicated appendicitis.

METHODS

This retrospective study included 1153 patients (mean age ± standard deviation, 30 ± 8 years) with appendicitis on CT (804 patients for development, and 349 for validation). Complicated appendicitis was confirmed in 300 and 121 patients in the development and validation datasets, respectively. The reference standard was surgical or pathological report except in 7 patients who underwent percutaneous abscess drainage. We developed a model using multivariable logistic regression and Bayesian information criterion. We assessed calibration and discriminatory performance of the model in the validation dataset via calibration plot and the area under the curve (AUC), respectively. We measured sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and proportion of false- and true-negatives of the model in the validation dataset, targeting 95% sensitivity.

RESULTS

Five CT features (contrast-enhancement defect of the appendiceal wall, abscess, moderate or severe periappendiceal fat stranding, appendiceal diameter, and extraluminal air) and percentage of segmented neutrophil were included in our model. The calibration slope was 1.03, and AUC was 0.81 (95% CI 0.77-0.85) in the validation dataset. The sensitivity, specificity, PPV, NPV, and proportion of false- and true-negatives were 93.4% (91.8-99.1), 28.1% (13.6-24.1), 40.8% (35.0-46.8), 88.9% (79.3-95.1), 2.3%, and 18.3%, respectively.

CONCLUSION

Our model may identify patients with unequivocally uncomplicated appendicitis, who may benefit from non-operative management with low risk of failure.

Risk of emergency surgery for complicated appendicitis: Japanese nationwide study

AIM

Appendicitis is divided into two categories: complicated appendicitis (CA) and uncomplicated appendicitis (UA). In pediatric patients with CA, the use of interval appendectomy (IA), which is non-operative management followed by elective surgery, has decreased the number of postoperative complications. Before discussing the merit of IA for adult patients, we need to clarify whether the frequency and seriousness of the complication rate after emergency surgery is higher for CA than for UA.

METHODS

This retrospective cohort study included adult patients who underwent appendectomy and who were registered in the National Clinical Database (NCD) from 2014 to 2016. Patients with CA who underwent emergency appendectomy comprised the CA group. Patients with UA comprised the UA group. Patients with chronic or recurrent appendicitis who underwent elective appendectomy comprised the elective appendectomy (EA) group. Primary outcomes were all morbidity, serious morbidity, and mortality within 30 days after appendectomy.

RESULTS

We included 109 256 patients in the study: 14 798 CA, 86 876 UA, and 7582 EA patients. Compared with the UA group, the rates of all morbidity, serious morbidity, and mortality were significantly higher in the CA group. All morbidity, serious morbidity, and mortality rates were significantly lower in the EA group than in the other two groups.

CONCLUSIONS

We confirmed that emergency surgery for CA places the patient at relatively higher risk. We also showed that the risk associated with EA is significantly lower than that for the other methods.

The Rolling Stones: A case report of two surgical abdomens linked by migrating gallstones

INTRODUCTION

Acute abdominal pain accounts for 5% of all presentations to the emergency department (Stoker et al., 2009). Two of the most common causes are acute appendicitis and acute cholecystitis (Ferris et al., 2017).

PRESENTATION

A 70-year-old man presented with acute calculous cholecystitis. He subsequently deteriorated clinically and re-imaging revealed interval migration of stones from the biliary system to the appendix with resultant acute appendicitis.

DISCUSSION

Although both acute appendicitis and acute cholecystitis are common, dual pathology is rare. There are a small number of case reports of gallstones causing appendicitis (Vicari, 1964; Siegal et al., 1990; Meade, 1960).

CONCLUSION

Our case report nicely illustrates. a) The importance of considering dual pathology, especially when there is an unexpected change in the patient's clinical status. b) The CT features of two common acute surgical pathologies. c) The value of cholecystostomy- performed in the Interventional Radiology suite- as a temporizing measure to allow the patient to recover from a critical illness.

Evaluation of role of hyperbilirubinemia as a new diagnostic marker of complicated appendicitis

BACKGROUND

In appendicitis, elevated intra-luminal pressure and ischemic necrosis of mucosa causes tissue gangrene or perforation. This leads to cytotoxin facilitated progressive bacterial invasion or translocation into the hepatic parenchyma through portal system. This phenomenon interferes with the bilirubin excretion into the bile canaliculi. In the present study, establishment of a possible role of hyperbilirubinemia as a marker of gangrenous/perforated appendicitis has been studied.

METHODS

After matching the inclusion and exclusion criteria, all cases of clinically diagnosed acute appendicitis were taken for this prospective, single center, observational study. Per-operative diagnosis was confirmed by histopathological examination.

RESULTS

Out of 110 subjects of acute appendicitis 41 subjects (37.27%) had hyperbilirubinemia. Out of 35 subjects diagnosed as complicated appendicitis 32 subjects (91.42%) had raised total bilirubin levels, while the remaining 03 (8.58%) had normal levels. Among 75 subjects diagnosed as acute simple appendicitis 09 subjects (12%) had raised total bilirubin level, while the remaining 66 subjects (88%) had normal levels. It was Mixed Type of Hyperbilirubinemia in gangrenous/perforated appendicitis. The sensitivity of Total serum bilirubin in predicting complicated appendicitis was found 91.43% (76.942% to 98.196%), where as the specificity of this test was 88.00% (78.439% to 94.363%). positive predictive value and negative predictive value were 78.03% and 95.65% respectively. Positive likelihood ratio and negative likelihood ratio were found to be 7.619 and 0.097 respectively taking prevalence of complicated appendicitis be 31.80%. Receiver Operating Characteristic curve was obtained which shows optimal criterion at Total Bilirubin Level 1.06 mg/dl where sensitivity was 91.43% and specificity was 97.33% at 95% confidence interval with 31.8% disease prevalence.

CONCLUSIONS

This is to conclude that Serum bilirubin level estimation, which is a simple, cheap and easily available laboratory test, can be added to the routine investigations in clinically suspected cases of acute appendicitis for early diagnosis of complications. Trial registration Registered with Clinical Trials Registry-India (ICMR-NIMS) with Registration number CTRI/2019/05/018879 Dated 01/05/2019. This was a prospective trial. Trial URL: http://ctri.nic.in/Clinicaltrials/pdf_generate.php?trialid=33113&EncHid=99780.32960&modid=1&compid=19%27,%2733113det%27 .

Effect of Oral Moxifloxacin vs Intravenous Ertapenem Plus Oral Levofloxacin for Treatment of Uncomplicated Acute Appendicitis: The APPAC II Randomized Clinical Trial

Importance

Antibiotics are an effective and safe alternative to appendectomy for managing uncomplicated acute appendicitis, but the optimal antibiotic regimen is not known.

Objective

To compare oral antibiotics with combined intravenous followed by oral antibiotics in the management of computed tomography-confirmed uncomplicated acute appendicitis.

Design, Setting, and Participants

The Appendicitis Acuta (APPAC) II multicenter, open-label, noninferiority randomized clinical trial was conducted from April 2017 until November 2018 in 9 Finnish hospitals. A total of 599 patients aged 18 to 60 years with computed tomography-confirmed uncomplicated acute appendicitis were enrolled in the trial. The last date of follow-up was November 29, 2019.

Interventions

Patients randomized to receive oral monotherapy (n = 295) received oral moxifloxacin (400 mg/d) for 7 days. Patients randomized to receive intravenous antibiotics followed by oral antibiotics (n = 288) received intravenous ertapenem (1 g/d) for 2 days followed by oral levofloxacin (500 mg/d) and metronidazole (500 mg 3 times/d) for 5 days.

Main Outcomes and Measures

The primary end point was treatment success (≥65%) for both groups, defined as discharge from hospital without surgery and no recurrent appendicitis during 1-year follow-up, and to determine whether oral antibiotics alone were noninferior to intravenous and oral antibiotics, with a margin of 6% for difference.

Results

Among 599 patients who were randomized (mean [SD] age, 36 [12] years; 263 [44%] women), 581 (99.7%) were available for the 1-year follow-up. The treatment success rate at 1 year was 70.2% (1-sided 95% CI, 65.8% to ∞) for patients treated with oral antibiotics and 73.8% (1-sided 95% CI, 69.5% to ∞) for patients treated with intravenous followed by oral antibiotics. The difference was -3.6% ([1-sided 95% CI, -9.7% to ∞]; P = .26 for noninferiority), with the confidence limit exceeding the noninferiority margin.

Conclusion and Relevance

Among adults with uncomplicated acute appendicitis, treatment with 7 days of oral moxifloxacin compared with 2 days of intravenous ertapenem followed by 5 days of levofloxacin and metronidazole resulted in treatment success rates greater than 65% in both groups, but failed to demonstrate noninferiority for treatment success of oral antibiotics compared with intravenous followed by oral antibiotics.

Trial Registration

ClinicalTrials.gov Identifier: NCT03236961; EudraCT Identifier: 2015-003633-10.

The usefulness and positive predictive value of ultrasonography and computed tomography in the diagnosis of acute appendicitis in adults: a retrospective study

OBJECTIVE

To analyze the evolution of the use of imaging tests (ultrasonography and computed tomography (CT)) in the diagnosis of acute appendicitis. To determine the positive predictive value of these tests and the percentage of negative and complicated appendectomies.

MATERIAL AND METHODS

This retrospective study compared adults who underwent appendectomy for suspected acute appendicitis at our tertiary hospital during 2015 versus similar patients at our center during 2007.

RESULTS

A total of 278 patients were included. The rate of negative appendectomies descended to 5%. The positive predictive value of ultrasonography increased to 97.4% in 2015, and the positive predictive value of CT and combined CT and ultrasonography was 100%. The rate of complicated appendicitis increased (23% in 2015).

CONCLUSIONS

The use of imaging tests increased, and the rate of "blind" laparotomies decreased. Nevertheless, the rate of complicated appendicitis increased.

Where did the patients go? Changes in acute appendicitis presentation and severity of illness during the coronavirus disease 2019 pandemic: A retrospective cohort study

BACKGROUND

The coronavirus disease 2019 pandemic restricted movement of individuals and altered provision of health care, abruptly transforming health care-use behaviors. It serves as a natural experiment to explore changes in presentations for surgical diseases including acute appendicitis. The objective was to determine if the pandemic was associated with changes in incidence of acute appendicitis compared to a historical control and to determine if there were associated changes in disease severity.

METHODS

The study is a retrospective, multicenter cohort study of adults (N = 956) presenting with appendicitis in nonpandemic versus pandemic time periods (December 1, 2019-March 10, 2020 versus March 11, 2020-May 16, 2020). Corresponding time periods in 2018 and 2019 composed the historical control. Primary outcome was mean biweekly counts of all appendicitis presentations, then stratified by complicated (n = 209) and uncomplicated (n = 747) disease. Trends in presentations were compared using difference-in-differences methodology. Changes in odds of presenting with complicated disease were assessed via clustered multivariable logistic regression.

RESULTS

There was a 29% decrease in mean biweekly appendicitis presentations from 5.4 to 3.8 (rate ratio = 0.71 [0.51, 0.98]) after the pandemic declaration, with a significant difference in differences compared with historical control (P = .003). Stratified by severity, the decrease was significant for uncomplicated appendicitis (rate ratio = 0.65 [95% confidence interval 0.47-0.91]) when compared with historical control (P = .03) but not for complicated appendicitis (rate ratio = 0.89 [95% confidence interval 0.52-1.52]); (P = .49). The odds of presenting with complicated disease did not change (adjusted odds ratio 1.36 [95% confidence interval 0.83-2.25]).

CONCLUSION

The pandemic was associated with decreased incidence of uncomplicated appendicitis without an accompanying increase in complicated disease. Changes in individual health care-use behaviors may underlie these differences, suggesting that some cases of uncomplicated appendicitis may resolve without progression to complicated disease.

A combined medical/surgical appendicitis pathway decreases pediatric CT utilization, perforation, and negative appendectomy rates

Background

We sought to improve the care of pediatric patients with possible appendicitis by decreasing unnecessary CT scanning. In an early QI initiative, we systematically emphasized the superiority of Ultrasonography (US) over CT, but did not find a decrease in CT utilization in practice. We therefore redoubled our initiative using a multimodal approach. We hypothesized a combined diagnostic and treatment pathway that allowed residual diagnostic uncertainty and used both surgery and antibiotic therapy for appendicitis that would decrease the need for diagnostic CT scanning.

Results

Prior to implementation of the protocol, 33% of ER patients with appendicitis typical abdominal pain were treated for appendicitis (with surgery); after implementation, the total number treated remained unchanged 32.5% (p = NS), but the appendectomy rate dropped from 33 (204/619) to 23% after implementation of the pathway (96/419, p < 0.0005) with 50 patients treated with antibiotics. There was a reduction in CT scanning (pre 39% vs. 11%, p < 0.0001) while the use of US increased (pre 30% vs. 53%, p < 0.0001). The perforation rate decreased from 12 to 5% (p < 0.002) and negative appendectomy decreased from 13 to 4% (p < 0.0001). Of the 50 patients treated with antibiotics, 10 eventually crossed over to surgery.

Conclusion

The use of a diagnostic and therapeutic pathway that offers antibiotic therapy for early probable appendicitis decreases the need for diagnostic CT scanning without increasing morbidity in pediatric appendicitis. Adherence to a medical/surgical treatment protocol that reserves surgery for clinically advanced appendicitis results in a reduction in CT scanning, perforation rates, negative appendectomy rates, and overall surgery for appendicitis.

Geographic Association Between Incidence of Acute Appendicitis and Socioeconomic Status

Importance

Some studies based on proportions of patients with perforated appendicitis (PA) among all patients with acute appendicitis (AA) have found an association between socioeconomic status (SES) and risk of perforation. A potential limitation is their use of proportions, which assumes that incidence of AA is evenly distributed across populations at risk. This assumption may be invalid, and SES may have a more complex association with both AA and PA.

Objective

To generate population-based incidences of AA and PA and to examine geographic patterns of incidence alongside geographic patterns of SES.

Design, Setting, and Participants

Retrospective study of data from Washington's Comprehensive Hospital Abstract Reporting System and the 2010 US census. Geographic methods were used to identify patterns of age- and sex-standardized incidence in Washington State between 2008 and 2012. The study included all patients discharged with International Classification of Diseases, Ninth Revision codes for AA or PA. Data were analyzed between November 2016 and December 2018.

Exposures

Location of primary residence.

Main Outcomes and Measures

Age- and sex-standardized incidence for AA and PA was generated for each census tract (CT). Global spatial autocorrelation was examined using Moran index (0.0 = completely random incidence; 1.0 = fully dependent on location). Clusters of low-incidence CTs (cold spots) and high-incidence CTs (hot spots) were identified for AA. Census-based SES data were aggregated for hot spots and cold spots and then compared.

Results

Statewide, over the 5-year study period, there were 35 730 patients with AA (including 9780 cases of PA), of whom 16 574 were women (46.4%). Median age of the cohort was 29 years (IQR, 16-48 years). Statewide incidence of AA and PA was 106 and 29 per 100 000 person-years (PY), respectively. Crude incidence was higher within the male population and peaked at age 10 to 19 years. Age- and sex-standardized incidence of AA demonstrated significant positive spatial autocorrelation (Moran index, 0.30; P < .001), but autocorrelation for PA was only half as strong (0.16; P < .001). Median incidence of AA was 118.1 per 100 000 PY among hot spots vs 86.2 per 100 000 PY among cold spots (P < .001). Socioeconomic status was higher in cold spots vs hot spots: mean proportion of college-educated adults was 56% vs 26% (P < .001), and mean per capita income was $44 691 vs $30 027 (P < .001).

Conclusions and Relevance

Age- and sex-standardized incidence of appendicitis is not randomly distributed across geographic subunits, and geographic clustering of AA is twice as strong as PA. Socioeconomic advantages, such as higher income and secondary education, are strongly associated with lower incidence of AA. These findings challenge conventional views that AA occurs randomly and has no predisposing characteristics beyond age/sex. Socioeconomic status, and likely other geographically circumscribed factors, are associated with incidence of AA.

Optimal Duration of Antibiotics Following Appendectomy for Patients With Complicated Appendicitis

BACKGROUND

Complicated appendicitis patients typically undergo appendectomy followed by antibiotics. The optimal course of antibiotics for complicated appendicitis is poorly defined.

METHODS

Data were collected from patients presenting with acute appendicitis and underwent appendectomy at the index hospitalization (2015-2017). Primary outcomes were readmission rate, superficial surgical site infection (SSI), deep space infection (DSI), which includes abscess. Length of post-operative antibiotic use was recorded and an average intent-to-treat (ITT) by operative grade was calculated.

RESULTS

Two hundred seventy-two patients (23%) were diagnosed with complicated appendicitis. SSI occurred in 4% of patients (n = 11); SSI rates ranged from 0% to 14.6% by ITT group with 3-4 days being the lowest (0%) and <3 days the highest (14.6%) (P = .008). DSI including abscesses occurred in 27 (9.9%) patients; least frequently in the 5-6 day ITT group (7.4%). Length of stay (LOS) was significantly related to longer antibiotic use (P < .001) and increasing operative grade (P < .01).

CONCLUSIONS

Given the lower incidence of postoperative complications between 3 and 6 days and no added benefit for ITT >6 days, we recommend limiting antibiotic treatment to 3-6 days for all complicated appendicitis cases with additional workup warranted if infectious symptoms persist.

Validation of a Scoring System to Distinguish Uncomplicated From Complicated Appendicitis

BACKGROUND

Studies have shown that uncomplicated appendicitis can be treated conservatively with antibiotics. It is important to select only those patients with uncomplicated appendicitis when considering conservative management. Recently, a scoring system based on clinical evaluation and ultrasound was developed to improve this selection and aid in shared decision making when considering an antibiotics-first strategy. The aim of this study was to externally validate the scoring system.

MATERIALS AND METHODS

A retrospective cohort study of all adult patients presenting to the emergency department between January 2014 and January 2017 with suspected acute appendicitis based on clinical evaluation and ultrasound was performed. For every patient, a score was calculated using the previously described scoring system. A final diagnosis, subdivided into complicated appendicitis, uncomplicated appendicitis, complicated alternative disease, and uncomplicated alternative disease, was assigned to every patient based on operative findings.

RESULTS

A total of 678 patients with suspected acute appendicitis based on clinical and ultrasonography findings were identified, of whom 175 (25.8%) had complicated appendicitis, 491 (72.4%) had uncomplicated appendicitis, and 12 (1.8%) had an alternative disease. Of the 678 patients, 272 had a score of five points or less, of whom 17 (6.2%) had complicated appendicitis, giving a negative predictive value of 93.8%.

CONCLUSIONS

With the scoring system based on clinical and ultrasonography features, 93.8% of patients predicted to have uncomplicated appendicitis were correctly identified. The scoring system could help identify patients suitable for conservative management in future studies.

Prolonged In-hospital Time to Appendectomy is Associated With Increased Complicated Appendicitis in Children

OBJECTIVE

To examine the association between prolonged in-hospital time to appendectomy (TTA) and the risk of complicated appendicitis.

SUMMARY BACKGROUND DATA

Historically, acute appendicitis was treated with emergency appendectomy. More recently, practice patterns have shifted to urgent appendectomy, with acceptable in-hospital delays of up to 24 hours. However, the consequences of prolonged TTA remain poorly understood. Herein, we present the largest individual analysis to date of outcomes associated with prolonged in-hospital delay before appendectomy in children.

METHODS

Data from patients who underwent appendectomy within 24 hours of hospital presentation were obtained from the American College of Surgeons Pediatric National Surgical Quality Improvement Program Procedure Targeted Appendectomy database from 2016 to 2018. Appendectomy within 16 hours of presentation was considered early, whereas those between 16 to 24 hours were defined as late. The primary outcome was operative findings of complicated appendicitis. Secondary outcomes included 30-day complications and resource utilization.

RESULTS

This study consisted of 18,927 patients, with 20.6% undergoing late appendectomy. The rate of complicated appendicitis was significantly higher in the late group (Early: 26.3%, Late: 30.3%, P < 0.05). Additionally, the late group had longer operative times, increased need for postoperative percutaneous drainage, antibiotics at discharge, parenteral nutrition, and an extended hospital length of stay (P < 0.05). On multivariate analysis, late appendectomy remained a predictor of complicated disease (odds ratio 1.17 [95% confidence interval, 1.08-1.27]).

CONCLUSIONS

A significant proportion of pediatric patients with acute appendicitis experience prolonged in-hospital delays before appendectomy, which are associated with modestly increased rates of complicated appendicitis. Although this does not indicate appendectomy needs to be done emergently, prolonged in-hospital TTA should be avoided whenever possible.

The Understated Malignancy Potential of Nonoperative Acute Appendicitis

Cancer of the appendix is rare and is most commonly found incidentally on pathology after an appendectomy for uncomplicated appendicitis (UA). The medical management alternative with antibiotics and observation remains an ongoing debate. The purpose of our study was to develop modern epidemiological data for adult patients completing an appendectomy for UA secondary to an appendiceal neoplasm (AN). ACS-NSQIP database was queried (2005–2016) to identify patients completing an appendectomy. Cohorts of patients who were diagnosed with UA and an AN were included in the study. Relevant perioperative clinical and outcomes data were collected. Type of AN, surgical procedure, and mortality were analyzed. A total of 239,615 UA patients were identified, of whom 2,773 (1.2%) met the inclusion criteria of AN. Patients with AN were predominantly white (79.5%), with a mean age of 54.5 ± 15.9 years, and 54.6 per cent were females. AN pathology findings included malignant neoplasm (64.5%), malignant carcinoid (17.3%), benign carcinoid (9.3%), and benign neoplasm (8.8%). The overall reported incidence was 1.2 per cent and the mortality rate was 0.7 per cent. Our study emphasizes surgical intervention in adult UA maintains a 1 per cent incidence of AN, and treatment with antibiotics alone will presumably lead to a delay in surgical treatment and progression of disease.

Delays in Treatment of Pediatric Appendicitis: A More Accurate Variable for Measuring Pediatric Healthcare Inequalities?

Racial and socioeconomic factors may cause barriers to healthcare access that result in delayed treatment. Because perforated appendicitis (PA) in children is thought to result from delays in treatment, it is often used as an index of barrier to access. Recent literature suggests that PA is not an inevitable consequence of delayed treatment, so it may not be the best marker for evaluating such barriers. Therefore we investigated whether racial and socioeconomic factors led directly to delays in treatment. We performed a retrospective study of 667 children undergoing appendectomy in a tertiary care center over 12.5 years. Univariate and multivariable regression analyses were used to determine if racial and socioeconomic variables were associated with increased risk of PA and increased risk of symptom duration greater than 48 hours. Hispanic children have higher rates of PA regardless of delays in treatment whereas Black children had higher PA rates likely due to delays in treatment. These differences were not from socioeconomic factors in our cohort. PA, a heterogeneous disease whose course is determined by multiple factors, is not a good metric for evaluation healthcare disparities in the pediatric population. Delays in treatment may be a more appropriate measure of healthcare inequalities in children.

Risk of Perforation in the Era of Nonemergent Management for Acute Appendicitis

Prompt appendectomy has long been the standard of care for acute appendicitis because of the risk of progression to perforation. Recently, studies have suggested nonemergent management of acute appendicitis. Our study aimed to determine changes in risk of rupture and complications in patients with appendicitis, with increasing time from symptom onset to treatment. Retrospective study of patients aged ≥18 years presenting to the University of North Carolina Hospitals with signs and symptoms of acute appendicitis who subsequently underwent appendectomy from 2011 to 2015 was performed. Demographic, clinical, laboratory, and pathologic data were reviewed. Bivariate analysis was performed to assess variables associated with increased risk of perforation. Poisson regression modeling was completed to evaluate the risk of perforation and postoperative abscess based on time from symptoms to treatment. Within our database of 1007 patients, the mean time from onset of symptoms to operative intervention was 3.24 ± 2.2 days. Modified Poisson regression modeling demonstrated the relative risk for perforation increases by 9% (RR 1.09, P < 0.001) for each day delay. Age (RR 1.03), male gender (RR 1.50), temperature on admission (RR 1.32), and the presence of fecalith (RR 1.89) statistically significantly increased the risk of perforation. Furthermore, for each day delay, there is an 8% increased risk of postoperative abscess (RR 1.08, P = 0.027). The relative risk for appendiceal perforation is 9 per cent per day delay with a resultant 8 per cent increased risk of postoperative abscess. Thus, appendectomy for acute appendicitis should remain an emergent procedure, given that delays in operative management lead to complications and increases in cost of care.

The value of post-operative antibiotic therapy after laparoscopic appendectomy for complicated acute appendicitis: a prospective, randomized, double-blinded, placebo-controlled phase III study (ABAP study)

BACKGROUND

Approximately 30% of appendectomies are for complicated acute appendicitis (CAA). With laparoscopy, the main post-operative complication is deep abscesses (12% of cases of CAA, versus 4% for open surgery). A recent cohort study compared short and long courses of postoperative antibiotic therapy in patients with CAA. There was no significant intergroup difference in the post-operative complication rate (12% of organ/space surgical site infection (SSI)). Moreover, antibiotic therapy is increasingly less indicated for other situations (non-complicated appendicitis, post-operative course of cholecystitis, perianal abscess), calling into question whether post-operative antibiotic therapy is required after laparoscopic appendectomy for CAA.

METHODS/DESIGN

This study is a prospective, multicenter, parallel-group, randomized (1:1), double-blinded, placebo-controlled, phase III non-inferiority study with blind evaluation of the primary efficacy criterion. The primary objective is to evaluate the impact of the absence of post-operative antibiotic therapy on the organ/space surgical site infection (SSI) rate in patients presenting with CAA (other than in cases of generalized peritonitis). Patients in the experimental group will receive at least one dose of preoperative and perioperative antibiotic therapy (2 g ceftriaxone by intravenous injection every 24 h up to the operation) and metronidazole (500 mg by intravenous injection every 8 h up to the operation) and, in the post-operative period, a placebo for ceftriaxone (2 g/24 h in one intravenous injection) and a placebo for metronidazole (1500 mg/24 h in three intravenous injections, for 3 days). In the control group, patients will receive at least one dose of preoperative and perioperative antibiotic therapy (2 g ceftriaxone by intravenous injection every 24 h up to the operation) and metronidazole (500 mg by intravenous injection every 8 h up to the operation) and, in the post-operative period, antibiotic therapy (ceftriaxone 2 g/24 h and metronidazole 1500 mg/24 h for 3 days). In the event of allergy to ceftriaxone, it will be replaced by levofloxacin (500 mg/24 h in one intravenous injection, for 3 days). The expected organ space SSI rate is 12% in the population of patients with CAA operated on by laparoscopy. With a non-inferiority margin of 5%, a two-sided alpha risk of 5%, a beta risk of 20%, and a loss-to-follow-up rate of 10%, the calculated sample size is 1476 included patients, i.e., 738 per group. Due to three interim analyses at 10%, 25%, and 50% of the planned sample size, the total sample size increases to 1494 patients (747 per arm).

TRIAL REGISTRATION

Ethical authorization by the Comité de Protection des Personnes and the Agence Nationale de Sécurité du Médicament: ID-RCB 2017-00334-59. Registered on ClinicalTrials.gov (NCT03688295) on 28 September 2018.

The Accuracy of Low-dose Computed Tomography Protocol in Patients With Suspected Acute Appendicitis: The OPTICAP Study

OBJECTIVE

To compare diagnostic accuracy of contrast enhanced low-dose computed tomography (CT) accomplished in the OPTICAP trial phantom phase to standard CT in patients with suspected acute appendicitis.

BACKGROUND

Increasing use of CT as the gold standard in diagnosing acute appendicitis has raised concerns regarding radiation exposure. Unenhanced low-dose CT protocols have shown similar diagnostic accuracy with standard CT for diagnosing appendicitis. To our knowledge, there are no other trials in which the same patient with suspected acute appendicitis underwent both standard and low-dose CT allowing interpatient comparison.

METHODS

OPTICAP is an interpatient protocol sequence randomized noninferiority single-center trial performed at Turku University Hospital between November, 2015 and August, 2016. Sixty patients with suspected acute appendicitis and body mass index <30 kg/m were enrolled to undergo both standard and low-dose contrast enhanced CT scans, which were categorized as normal, uncomplicated or complicated appendicitis by 2 radiologists in blinded manner. All patients with CT confirmed appendicitis underwent appendectomy to obtain histopathology.

RESULTS

The low-dose protocol was not inferior to standard protocol in terms of diagnostic accuracy; 79% [95% confidence interval (CI) 66%-89%) accurate diagnosis in low-dose and 80% (95% CI 67%-90%) in standard CT by primary radiologist. Accuracy to categorize appendicitis severity was 79% for both protocols. The mean radiation dose of low-dose CT was significantly lower compared with standard CT (3.33 and 4.44 mSv, respectively).

CONCLUSION

Diagnostic accuracy of contrast enhanced low-dose CT was not inferior to standard CT in diagnosing acute appendicitis or distinguishing between uncomplicated and complicated acute appendicitis in patients with a high likelihood of acute appendicitis. Low-dose CT enabled significant radiation dose reduction.

Management of complicated acute appendicitis in children: Still an existing controversy

Complicated acute appendicitis (CAA) is a serious condition and carries significant morbidity in children. A strict diagnosis is challenging, as there are many lesions that mimic CAA. The management of CAA is still controversial. There are two options for treatment: Immediate operative management and non-operative management with antibiotics and/or drainage of any abscess or phlegmon. Each method of treatment has advantages and disadvantages. Operative management may be difficult due to the presence of inflamed tissues and may lead to detrimental events. In many cases, non-operative management with or without drainage and interval appendectomy is advised. The reasons for this approach include new medications and policies for the use of antibiotic therapy. Furthermore, advances in radiological interventions may overcome difficulties such as diagnosing and managing the complications of CAA without any surgeries. However, questions have been raised about the risk of recurrence, prolonged use of antibiotics, lengthened hospital stay and delay in returning to daily activities. Moreover, the need for interval appendectomy is currently under debate because of the low risk of recurrence. Due to the paucity of high-quality studies, more randomized controlled trials to determine the precise management strategy are needed. This review aims to study the current data on operative vs non-operative management for CAA in children and to extract any useful information from the literature.

Incidental Prophylactic Appendectomy Is Associated with a Profound Microbial Dysbiosis in the Long-Term

Incidental prophylactic surgeries are performed in certain situations. Incidental prophylactic appendectomies were common practice within opened bariatric surgeries. The gut microbiota has emerged as an important actor within the homeostasis of the host. A new hypothesis has been formulated about the appendix function in relation to gut microbiota. Our objective was to study the gut microbiota profiles of patients that had suffered from an incidental prophylactic appendectomy during their bariatric surgeries, while comparing them to patients whose appendixes had remained intact. A case-control observational prospective study of 40 patients who underwent bariatric surgery, with or without an incidental prophylactic appendectomy, during 2004-2008 with an evaluation of their gut microbiota populations at the end of 2016 was conducted by sequencing the 16 S rRNA gene by Next Generation Sequencing of patients' stools and appendix tissues. Patients with their appendix removed showed lower levels of richness and diversity of their gut microbiota populations. Odoribacter, Bilophila, Butyricimonas, and Faecalibacterium levels were increased in the Intact group, while Lachnobacterium suffered an expansion in the group without the appendix. Moreover, a linear regression model introduced the concept that Butyricimonas and Odoribacter may be implicated in insulin regulation. Thus, gut microbiota should be considered in the decisions of practical surgery, regarding the appendix as a mediator of homeostasis in the host. Butyricimonas and Odoribacter require further investigation as key bacteria implicated in insulin regulation.

Diagnosis and treatment of acute appendicitis: 2020 update of the WSES Jerusalem guidelines

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.

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.

The SIFIPAC/WSES/SICG/SIMEU guidelines for diagnosis and treatment of acute appendicitis in the elderly (2019 edition)

The epidemiology and the outcomes of acute appendicitis in elderly patients are very different from the younger population. Elderly patients with acute appendicitis showed higher mortality, higher perforation rate, lower diagnostic accuracy, longer delay from symptoms onset and admission, higher postoperative complication rate and higher risk of colonic and appendiceal cancer. The aim of the present work was to investigate age-related factors that could influence a different approach, compared to the 2016 WSES Jerusalem guidelines on general population, in terms of diagnosis and management of elderly patient with acute appendicitis. During the XXIX National Congress of the Italian Society of Surgical Pathophysiology (SIFIPAC) held in Cesena (Italy) in May 2019, in collaboration with the Italian Society of Geriatric Surgery (SICG), the World Society of Emergency Surgery (WSES) and the Italian Society of Emergency Medicine (SIMEU), a panel of experts participated to a Consensus Conference where eight panelists presented a number of statements, which were developed for each of the four topics about diagnosis and management of acute appendicitis in elderly patients, formulated according to the GRADE system. The statements were then voted, eventually modified and finally approved by the participants to the Consensus Conference. The current paper is reporting the definitive guidelines statements on each of the following topics: diagnosis, non-operative management, operative management and antibiotic therapy.

AppendiXNet: Deep Learning for Diagnosis of Appendicitis from A Small Dataset of CT Exams Using Video Pretraining

The development of deep learning algorithms for complex tasks in digital medicine has relied on the availability of large labeled training datasets, usually containing hundreds of thousands of examples. The purpose of this study was to develop a 3D deep learning model, AppendiXNet, to detect appendicitis, one of the most common life-threatening abdominal emergencies, using a small training dataset of less than 500 training CT exams. We explored whether pretraining the model on a large collection of natural videos would improve the performance of the model over training the model from scratch. AppendiXNet was pretrained on a large collection of YouTube videos called Kinetics, consisting of approximately 500,000 video clips and annotated for one of 600 human action classes, and then fine-tuned on a small dataset of 438 CT scans annotated for appendicitis. We found that pretraining the 3D model on natural videos significantly improved the performance of the model from an AUC of 0.724 (95% CI 0.625, 0.823) to 0.810 (95% CI 0.725, 0.895). The application of deep learning to detect abnormalities on CT examinations using video pretraining could generalize effectively to other challenging cross-sectional medical imaging tasks when training data is limited.

Evaluation of appendicitis risk prediction models in adults with suspected appendicitis

BACKGROUND

Appendicitis is the most common general surgical emergency worldwide, but its diagnosis remains challenging. The aim of this study was to determine whether existing risk prediction models can reliably identify patients presenting to hospital in the UK with acute right iliac fossa (RIF) pain who are at low risk of appendicitis.

METHODS

A systematic search was completed to identify all existing appendicitis risk prediction models. Models were validated using UK data from an international prospective cohort study that captured consecutive patients aged 16-45 years presenting to hospital with acute RIF in March to June 2017. The main outcome was best achievable model specificity (proportion of patients who did not have appendicitis correctly classified as low risk) whilst maintaining a failure rate below 5 per cent (proportion of patients identified as low risk who actually had appendicitis).

RESULTS

Some 5345 patients across 154 UK hospitals were identified, of which two-thirds (3613 of 5345, 67·6 per cent) were women. Women were more than twice as likely to undergo surgery with removal of a histologically normal appendix (272 of 964, 28·2 per cent) than men (120 of 993, 12·1 per cent) (relative risk 2·33, 95 per cent c.i. 1·92 to 2·84; P < 0·001). Of 15 validated risk prediction models, the Adult Appendicitis Score performed best (cut-off score 8 or less, specificity 63·1 per cent, failure rate 3·7 per cent). The Appendicitis Inflammatory Response Score performed best for men (cut-off score 2 or less, specificity 24·7 per cent, failure rate 2·4 per cent).

CONCLUSION

Women in the UK had a disproportionate risk of admission without surgical intervention and had high rates of normal appendicectomy. Risk prediction models to support shared decision-making by identifying adults in the UK at low risk of appendicitis were identified.

Risk of Appendiceal Neoplasm in Periappendicular Abscess in Patients Treated With Interval Appendectomy vs Follow-up With Magnetic Resonance Imaging: 1-Year Outcomes of the Peri-Appendicitis Acuta Randomized Clinical Trial

Importance

The step after conservative treatment of periappendicular abscess arouses controversy, ranging from recommendations to abandon interval appendectomy based on low recurrence rates of the precipitating diagnosis to performing routine interval appendectomy owing to novel findings of increased neoplasm risk at interval appendectomy. To our knowledge, there are no randomized clinical trials with sufficient patient numbers comparing these treatments.

Objective

To compare interval appendectomy and follow-up with magnetic resonance imaging after initial successful nonoperative treatment of periappendicular abscess.

Design, Setting, and Participants

The Peri-Appendicitis Acuta randomized clinical trial was a multicenter, noninferiority trial conducted in 5 hospitals in Finland. All patients between age 18 and 60 years with periappendicular abscess diagnosed by computed tomography and successful initial nonoperative treatment from January 2013 to April 2016 were included. Data analysis occurred from April 2016 to September 2017.

Interventions

Patients were randomized either to interval appendectomy or follow-up with magnetic resonance imaging; all patients underwent colonoscopy.

Main Outcomes and Measures

The primary end point was treatment success, defined as an absence of postoperative morbidity in the appendectomy group and appendicitis recurrence in the follow-up group. Secondary predefined end points included neoplasm incidence, inflammatory bowel disease, length of hospital stay, and days of sick leave.

Results

A total of 60 patients were included (36 men [60%]; median [interquartile range] age: interval appendectomy group, 49 [18-60] years; follow-up group, 47 [22-61] years). An interim analysis in April 2016 showed a high rate of neoplasm (10 of 60 [17%]), with all neoplasms in patients older than 40 years. The trial was prematurely terminated owing to ethical concerns. Two more neoplasms were diagnosed after study termination, resulting in an overall neoplasm incidence of 20% (12 of 60). On study termination, the overall morbidity rate of interval appendectomy was 10% (3 of 30), and 10 of the patients in the follow-up group (33%) had undergone appendectomy.

Conclusions and Relevance

The neoplasm rate after periappendicular abscess in this small study population was high, especially in patients older than 40 years. If this considerable rate of neoplasms after periappendicular abscess is validated by future studies, it would argue for routine interval appendectomy in this setting.

Trial Registration

ClinicalTrials.gov identifier: NCT03013686.

Early appendectomy vs. conservative management in complicated acute appendicitis in children: A meta-analysis

BACKGROUND

No consensus exists among surgeons regarding the optimal treatment of complicated acute appendicitis in children (CAA). Existing studies present heterogeneity of data and only few studies analyzed free perforated appendicitis (FPA) separately from appendicular abscess (AAb) and appendicular phlegmon (AP).

METHOD

Studies which have been judged eligible for this systematic review and consequent meta-analysis are those comparing non-operative management (NOM) with operative management (OM) in children with CAA. Studies were subgrouped between those analyzing mixed patients with CAA, those focusing on patients with AAb/AP and those focusing on patients with FPA.

RESULTS

Fourteen studies fulfilled the inclusion criteria and were included in the meta-analysis with a total of 1288 patients. In the fixed-effects model the complication rate was significantly favorable to the initial NOM arm for the AAb/AP subgroup (RR = 0.07, 95%CI = 0.02-0.27) and to the OM arm for the FPA subgroup (RR = 1.86, 95%CI = 1.20-2.87); the re-admission rate was significantly favorable to the initial NOM arm for the AAb/AP subgroup (RR = 0.35, 95%CI = 0.13-0.93) and to the OM arm for the FPA subgroup (RR = 1.49, 95%CI = 1.49-7.44). There was no statistical heterogeneity for the two subgroups of patients. The costs weren't significantly different between NOM and OM. The length of stay was favorable to OM. The pooled proportion rate of NOM success was 90%, the pooled relapse rate of appendicitis was 15.4%.

CONCLUSIONS

Children with AAb/AP reported better results in terms of complication rate and re-admission rate if treated with NOM. Conversely children with FPA showed lower complication rate and re-admission rate if treated with OM.

LEVEL OF EVIDENCE

II.

Microbiota of Children With Complex Appendicitis: Different Composition and Diversity of The Microbiota in Children With Complex Compared With Simple Appendicitis

BACKGROUND

Two types of appendicitis are hypothesized, simple and complex, with potential different treatment strategies. To improve differentiation, underlying pathogeneses need to be further unraveled.

AIM

To determine if the microbial composition in the appendix differs between children with simple and complex appendicitis.

METHODS

Two-center, prospective cohort study including 40 children (0-17 years old) undergoing appendectomy for suspected appendicitis. Appendix tissue was used for IS-pro analysis to identify bacterial species by their length of 16S-23S rDNA interspacer (IS) region. Cluster analysis, based on IS-profiles, and correspondence with type of appendicitis, using Fisher exact test, was performed. Simple and complex appendicitis were compared regarding bacterial presence, intensity and diversity, using Fisher exact test and Mann-Whitney U test, respectively.

RESULTS

Appendicitis was confirmed in 36 of 40 patients (16 simple, 20 complex). Cluster analysis identified 2 clusters, encompassing 34 patients. Distribution of simple and complex appendicitis was 12 (80%) and 3 (20%) versus 3 (16%) and 16 (84%) patients for clusters 1 and 2, respectively (P < 0.001). Complex appendicitis was on phylum level characterized by an increased intensity (Bacteroidetes P = 0.001, Firmicutes, Actinobacteria, Fusobacteria and Verrucomicrobia (FAFV) P = 0.005 and Proteobacteria P < 0.001) and diversity (Bacteroidetes P = 0.001 and Proteobacteria P = 0.016) and an increased abundance of 5 species (Alistipes finegoldii P = 0.009, Bacteroides fragilis P = 0.002, Escherichia coli P = 0.014, Parvimonas micra P = 0.022 and Sutterella spp P = 0.026).

CONCLUSIONS

The microbial composition of the appendix differs between children with simple and complex appendicitis, regarding both composition and diversity. Future research should focus on the role of these bacteria in the pathogenesis of both types and its implications for preoperative diagnostics.

Laboratory Markers in the Prediction of Acute Perforated Appendicitis in Children

Objective

This study aimed to explore the laboratory markers associated with perforation in children with acute appendicitis.

Methods

This retrospective study reviewed 1895 children (3–18 years old) with confirmed acute appendicitis from 2007 to 2017. Clinical (demographic characteristics, symptoms, and signs) and laboratory data (white blood cell count, C-reactive protein (CRP), procalcitonin, D-lactate, platelet count, bilirubin, aspartate aminotransferase, and alanine aminotransferase) were collected and compared between perforated and nonperforated groups. The logistic regression analysis was performed to identify independent risk factors.

Results

Of all patients, 613 children were perforated. Children with perforation had significantly longer duration of symptoms, higher white blood cell count, CRP level, and neutrophils percentage, and lower serum sodium level. Elevated white blood cell count with CRP level and elevated neutrophils percentage with CRP level were found to be associated with risk of perforation.

Conclusions

White blood cell count with C-reactive protein and neutrophils percentage with CRP are important markers in distinguishing perforated appendicitis from nonperforated appendicitis in pediatric subjects.

[Rational diagnostics of acute appendicitis]

Acute appendicitis is one of the most common abdominal emergencies. An accurate preoperative diagnosis is still a challenge in many cases. Patient history and clinical examination are the mainstay of diagnostics but other tools are also needed in order to reduce the number of misdiagnoses. Laboratory parameters and radiological imaging procedures are widely used and scoring systems can help in the risk stratification of patients with suspected appendicitis. In the USA most patients undergo preoperative computed tomography (CT) as the first-line examination, which can reduce the number of negative appendectomies to less than 5%; however, this practice results in substantial radiation exposure and is less accepted in Europe due to concerns about radiation-induced cancer in the often younger patients. Ultrasound is a valuable first-line imaging procedure and in experienced hands can achieve very good results. In patients with an equivocal diagnosis inpatient surveillance with close control of clinical and laboratory parameter represents a suitable method to reduce the number of negative explorations without resulting in an increase in the rate of perforation or morbidity.

Appendicolith appendicitis is clinically complicated acute appendicitis-is it histopathologically different from uncomplicated acute appendicitis

PURPOSE

Acute appendicitis may present as uncomplicated and complicated and these disease forms differ both epidemiologically and clinically. Complicated acute appendicitis has traditionally been defined as an appendicitis complicated by perforation or a periappendicular abscess, and an appendicolith represents a predisposing factor of complicated disease. There are histopathological differences between uncomplicated acute appendicitis and the previously established traditional forms of complicated acute appendicitis, but to our knowledge, the histopathological differences between uncomplicated acute appendicitis and complicated acute appendicitis presenting with an appendicolith have not yet been reported. The study purpose was to assess these differences with two prospective patient cohorts: (1) computed tomography (CT) confirmed uncomplicated acute appendicitis patients enrolled in the surgical treatment arm of the randomized APPAC trial comparing appendectomy with antibiotics for the treatment of uncomplicated acute appendicitis and (2) patients with CT-verified acute appendicitis presenting with an appendicolith excluded from the APPAC trial.

METHODS

The following histopathological parameters were assessed: appendiceal diameter, depth of inflammation, micro-abscesses, density of eosinophils, and neutrophils in appendiceal wall and surface epithelium degeneration.

RESULTS

Using multivariable logistic regression models adjusted for age, gender, and symptom duration, statistically significant differences were detected in the depth of inflammation ≤ 2.8 mm (adjusted OR 2.18 (95%CI: 1.29-3.71, p = 0.004), micro-abscesses (adjusted OR 2.16 (95%CI: 1.22-3.83, p = 0.008), the number of eosinophils and neutrophils ≥ 150/mm² (adjusted OR 0.97 (95%CI: 0.95-0.99, p = 0.013), adjusted OR 3.04 (95%CI: 1.82-5.09, p < 0.001, respectively).

CONCLUSIONS

These results corroborate the known clinical association of an appendicolith to complicated acute appendicitis.

Preoperative assessment of complicated appendicitis through stress reaction and clinical manifestations

This study assessed the severity of the disease through the preoperative clinical manifestations and inflammatory reaction indicators of acute appendicitis, and established a score table to predict complicated appendicitis (CA).The clinical data of 238 patients with acute appendicitis in our hospital were retrospectively analyzed, which included 18 patients with acute simple appendicitis (7.6%), 170 patients with acute purulent appendicitis (72.0%), and 48 patients with acute gangrene and perforation (20.3%). The clinical manifestations and inflammatory reaction indicators were analyzed by univariate logistic regression. Multivariate logistic regression analysis was performed to screen out the independent risk factors of CA. The β coefficients of independent risk factors entering the multivariate model were assigned by rounding, and the total score was the sum of values of all factors. Finally, verification and analysis were performed for the predictive model, and the operating characteristic curve (ROC) curve was drawn. Then, the area under the curve (AUC) was compared with the THRIVE scale, and the Hosmer-Lemeshow method was used to evaluate whether the model fitted well.The multivariate logistic regression analysis of independent risk factors was performed, and the values were rounded to the variable assignment based on the β coefficient values. The plotted ROC and AUC was calculated as 0.857 (P < .001). Using the Hosmer-Lemeshow method, the X-value was 12.430, suggesting that the prediction model fitted well.The scoring system can quickly determine whether this is a CA, allowing for an earlier and correct diagnosis and treatment. Furthermore, the scoring system was convenient, economical, and affordable. Moreover, it is easy to popularized and promote.

Comparison of conservative treatment with appendectomy for acute uncomplicated pediatric appendicitis: a meta-analysis

Aim: We aimed to compare conservative treatment with surgery for uncomplicated pediatric appendicitis to estimate effectiveness and safety. Methods: Data recorded until September 2018 were searched, and relevant academic articles from PubMed, EMBASE, the Cochrane Library and other libraries were selected. STATA version 13.0 (Stata Corporation, TX, USA) was used for statistical analysis. Results: We identified nine eligible papers. The study reported a significant difference in the success rate of treatment in 1 month and in 1 year, and no difference in the incidence of complications. The patients with fecaliths showed low treatment efficacy in conservative treatment group (p < 0.05). Conclusion: Standardized conservative treatment as inpatients for pediatric appendicitis is safe and feasible. Appendectomy was the better choice for patients with fecaliths.

Factors Associated with Complicated Appendicitis: View from a Low-middle Income Country

Introduction Factors associated with complicated appendicitis have been inconsistently identified. Moreover, studies are lacking from low and low-middle countries where access to surgical care is limited. Our objective was to identify factors predicting complicated appendicitis as diagnosed intraoperatively in a low-middle income country hospital. Methodology Retrospective case-control study of patients who underwent laparoscopic appendectomy from 01/2008 to 12/2015 was completed. Based on intraoperative diagnosis of complicated appendicitis, patients were divided into two groups; those with complicated appendicitis (CA) and those who had non-complicated appendicitis (NCA). CT scans were further reviewed to identify presence of appendicolith. Result Of the 442 patients included, 88 (20%) patients were in the CA group while 354 (80%) patients were in the NCA group. Patients in the CA group were older [CA vs. NCA: 34.6 ± 14 vs. 30.4 ± 11.5; p-value < 0.001], had symptoms for longer duration [CA vs. NCA: 2 ± 1.2 vs. 1.5 ± 0.8; p-value: 0.001] and had a greater proportion of patients with appendicoliths [CA vs. NCA: 37 (42%) vs. 84 (23.7%); p-value: 0.001]. On multivariable regression analysis, patients with complicated appendicitis had greater odds of having appendicoliths (OR: 2.4, 95% CI: 1.4-4.07; p-value < 0.001) and symptoms for a longer duration (OR: 1.57, 95% CI: 1.25-1.97; p-value < 0.001). Conclusion Patients with complicated appendicitis had greater odds of having appendicoliths and symptoms for a longer duration. Further studies are warranted in low and low-middle income countries to gauge the impact delay in presentation and intervention has on appendicitis and its outcomes.

Clinical and Imaging Correlates of Pediatric Mucosal Appendicitis

BACKGROUND

Mucosal appendicitis is a controversial entity that is histologically distinct from transmural appendicitis. There is mixed opinion regarding mucosal inflammation as a spectrum of appendicitis versus a negative appendectomy. The ability to distinguish these diagnoses preoperatively is of importance to prevent unnecessary surgery. We hypothesize that patients with mucosal appendicitis can be discriminated from those with transmural disease based on specific preoperative clinical and imaging findings.

MATERIALS AND METHODS

After IRB approval, all patients who underwent laparoscopic appendectomy at our institution during 2015 were reviewed in the electronic medical record. Patients with mucosal appendicitis were identified and matched 2:1 to a random cohort of nonperforated transmural appendicitis cases. Demographic and clinical data were collected, including history, examination, laboratory, and imaging findings. Preoperative factors associated with mucosal appendicitis were modeled using binomial logistic regression analysis.

RESULTS

Of 1153 appendectomies performed during 2015, 103 patients had pathologic diagnosis of mucosal appendicitis. When compared with patients with mucosal infection, leukocytosis >10,000 per microliter led to 5.9 times higher likelihood of transmural pathology (P = 0.000). Noncompressibility on ultrasound was associated with 7.3 times higher likelihood of transmural disease (P = 0.015). Echogenic changes were predictive of transmural appendicitis, conferring 3.9 times the risk (P = 0.007). Presence of free fluid led to 2.3 times the rate of transmural pathology (P = 0.007). Finally, for every millimeter decrease in appendiceal diameter, patients were half as likely to exhibit transmural disease (P = 0.000). Together, these variables can successfully predict presence of mucosal appendicitis on final pathology report at a rate of 82.1%, and explain 60% of the variance in diagnosis of mucosal versus transmural appendicitis (P = 0.000).

CONCLUSIONS

Mucosal appendicitis remains a controversial pathologic entity, but is not associated with greater complications compared with transmural appendicitis when treated with laparoscopic appendectomy. Transmural disease can be predicted by leukocytosis, noncompressible appendix, presence of free fluid, larger appendiceal diameter and echogenicity.

Methods of conservative antibiotic treatment of acute uncomplicated appendicitis: A systematic review

BACKGROUND

Meta-analyses and a recent guideline acknowledge that conservative management of uncomplicated appendicitis with antibiotics can be successful for patients who wish to avoid surgery. However, guidance as to specific management does not exist.

METHODS

PUBMED and EMBASE search of trials describing methods of conservative treatment was conducted according to Preferred Reporting Items for Systematic reviews and Meta-Analyses guidelines.

RESULTS

Thirty-four studies involving 2,944 antibiotic-treated participants were identified. The greatest experience with conservative treatment is in persons 5 to 50 years of age. In most trials, imaging was used to confirm localized appendicitis without evidence of abscess, phlegmon, or tumor. Antibiotics regimens were generally consistent with intra-abdominal infection treatment guidelines and used for a total of 7 to 10 days. Approaches ranged from 3-day hospitalization on parenteral agents to same-day hospital or ED discharge of stable patients with outpatient oral antibiotics. Minimum time allowed before response was evaluated varied from 8 to 72 hours. Although pain was a common criterion for nonresponse and appendectomy, analgesic regimens were poorly described. Trials differed in use of other response indicators, that is, white blood cell count, C-reactive protein, and reimaging. Diet ranged from restriction for 48 hours to as tolerated. Initial response rates were generally greater than 90% and most participants improved by 24 to 48 hours, with no related severe sepsis or deaths. In most studies, appendectomy was recommended for recurrence; however, in several, patients had antibiotic retreatment with success.

CONCLUSION

While further investigation of conservative treatment is ongoing, patients considering this approach should be advised and managed according to study methods and related guidelines to promote informed shared decision-making and optimize their chance of similar outcomes as described in published trials. Future studies that address biases associated with enrollment and response evaluation, employ best-practice pain control and antibiotic selection, better define cancer risk, and explore longer time thresholds for response, minimized diet restriction and hospital stays, and antibiotic re-treatment will further our understanding of the potential effectiveness of conservative management.

LEVEL OF EVIDENCE

Systematic review, level II.