Diagnosis and treatment of appendicitis: systematic review and meta-analysis

Current usage and diagnostic performance of cross-sectional imaging in patients with suspected acute appendicitis: a national survey in China

PURPOSE

The role of cross-sectional imaging in the management of acute appendicitis (AA) is contentious. This study aimed to investigate the current usage and diagnostic performance of ultrasound (US) and computed tomography (CT).

METHODS

A national survey was conducted by a core group from The National Ultrasound Quality and Control Center of China among radiologists practicing in medical institutions equipped with emergency departments and regularly performing appendectomies. Radiologists participated by completing the survey online from August 2022 to August 2023 after reviewing medical records of at least 40 patients with suspected AA. Sensitivity, specificity, positive predictive value, and negative predictive value and likelihood ratios were calculated for US and CT, respectively. Diagnostic performance of US between hospital subgroups were also compared.

RESULTS

A total of 141 questionnaires were submitted and 118 were eligible, each representing a distinct hospital. A total of 1844 children and 4165 adults were included. There were 76.4% patients underwent US studies, while 23.9% underwent CT studies. Higher percentage of children underwent US studies than adults (82.2% vs. 73.9%, P = 0.000). In children, the sensitivity and specificity of US were 89% and 90%, and of CT were 90% and 48%. In adults, the sensitivity and specificity of US were 92% and 84%, and of CT were 94% and 79%. The Likelihood ratios of US were higher in specialized hospitals (children's or children's and women's hospitals) than general hospitals (34.1 vs. 6.43).

CONCLUSION

US is more commonly used than CT for diagnosing AA in both adults and children. The diagnostic performance of US is comparable to CT. These findings underscore the recognition of US in clinical practice as a low-cost, non-radiative tool.

Modified single-port laparoscopic appendectomy using needle-type grasping forceps vs conventional three-port laparoscopic appendectomy for acute uncomplicated appendicitis

BACKGROUND

Single-port laparoscopic appendectomy is an advanced minimally invasive surgery that involves the use of upgraded instruments and equipment. We previously modified single-port laparoscopic appendectomy with needle-type grasping forceps (mSLAN) for patients with simple appendicitis, but the feasibility and safety of our modified procedure need further evaluation in a high-quality clinical study.

AIM

To compare the short-term clinical outcomes of mSLAN with those of conventional three-port laparoscopic appendectomy (CLA) for patients with acute uncomplicated appendicitis.

METHODS

This single-center, single-blind, prospective, randomized controlled trial included patients who underwent emergency laparoscopic appendectomy for acute uncomplicated appendicitis at our center between April 2024 and August 2024. Patients were randomly divided into the mSLAN group or the CLA group via computer-generated randomization. The primary endpoint was the 24-hour postoperative visual analog scale (VAS) score, and the secondary endpoints included the operative time, 24-hour postoperative inflammatory response biomarkers (including white blood cells, the neutrophil ratio, interleukin-6, and C-reactive protein), time to first postoperative exhaust, time to first out-of-bed activity, postoperative length of hospital stay, cost of hospitalization, and incidence of postoperative complications.

RESULTS

A total of 72 patients were enrolled and randomly divided into 2 groups: The mSLAN group (n = 36) and the CLA group (n = 36). The 24-hour VAS scores, 24-hour postoperative inflammatory response marker levels, first postoperative exhaust times, first out-of-bed activity times, postoperative lengths of hospital stay, operative times, or hospitalization costs did not significantly differ between the two groups. No postoperative complications, including incision infection or hernia, abdominal abscess or intestinal obstruction, were observed during the 1-month postoperative follow-up in either group.

CONCLUSION

Compared with the CLA protocol, the mSLAN protocol for acute uncomplicated appendicitis yielded comparable short-term clinical outcomes, with a similar operative time and better cosmetic outcomes, indicating its potential for clinical application and superiority for patients with high cosmetic requirements. Further research is needed to evaluate the long-term outcomes.

Risk prediction and effect evaluation of complicated appendicitis based on XGBoost modeling

PURPOSE

The distinction between complicated appendicitis (CAP) and uncomplicated appendicitis (UAP) remains challenging. The purpose of this study was to construct a safe and economical diagnostic model that can accurately and rapidly differentiate between CAP and UAP.

METHODS

Patient data from 773 appendectomies were retrospectively collected, important features were selected using random forests, and the data were divided into training and test sets in a 3:1 ratio. An integrated learning algorithm, Extreme Gradient Boosting (XGBoost), was introduced to predict the risk of CAP and compared with Support Vector Machine (SVM), Random Forest (RF), and Decision Tree (CART) algorithms. A comprehensive comparison of the four algorithms was performed using model performance metrics such as the area under the receiver's operating characteristic curve (AUC), sensitivity, specificity, accuracy, precision, negative predictive value(NPV), positive predictive value(PPV),calibration curves, and clinical decision curve analysis (DCA).

RESULT

The results show that all four prediction models exhibit some predictive ability. The XGBoost model showed the best prediction with AUC, accuracy, sensitivity, specificity,NPV and PPV of 0.914, 0.855, 0.865, 0.846,0.848 and 0.897, respectively, followed by the SVM model with results of AUC, accuracy, sensitivity, specificity,NPV and PPV of 0.882, 0.819, 0.865, 0.779, 0.770 and 0.871, respectively. XGBoost and SVM models show very good calibration. The XGBoost model showed better net clinical benefit compared to the DCA curves of the other models.

CONCLUSION

Predictive models based on the XGBoost algorithm have good performance in predicting the risk of acute appendicitis progressing to complicated appendicitis, which helps to optimize clinical decision making.

Conservative Management of Pediatric Patients With Appendicolith Appendicitis Versus Non-appendicolith Appendicitis: A Systematic Review and Meta-analysis

INTRODUCTION

Up to one-third of pediatric patients with acute appendicitis present with radiological evidence of appendicoliths. However, whether appendicolith presence influences prognosis under conservative management compared to non-appendicolith appendicitis remains uncertain.

METHODS

We systematically searched PubMed, Cochrane, Embase, and Web of Science databases for studies comparing pediatric appendicolith and non-appendicolith appendicitis managed conservatively with antibiotics, fluids, and percutaneous drainage. Outcomes included the initial success of conservative management and recurrence rates. A random-effects model was applied for all analyses.

RESULTS

Twelve observational studies with 814 patients were included. Of these, 282 (35 %) had appendicoliths, and 532 (65 %) did not. The average age ranged from 2 to 11 years, with follow-up between 1 week and 2 years. Overall, there is no significant difference in the initial success of conservative management was observed between the two groups (OR 0.70; 95 % CI 0.28-1.78; p = 0.46). Subgroup analysis revealed lower success rates for appendicolith-associated simple appendicitis (OR 0.42; 95 % CI 0.21-0.84; p = 0.01), but no difference in complicated appendicitis (OR 1.01; 95 % CI 0.24-4.31; p = 0.99). Recurrence rates were significantly higher in appendicolith appendicitis across both groups (OR 2.75; 95 % CI 1.05-7.20; p = 0.04).

CONCLUSION

Appendicolith presence reduces conservative management success in simple appendicitis, supporting early appendectomy. Although appendicoliths do not predict treatment failure in complicated appendicitis, interval appendectomy may be advisable due to the higher recurrence risk in both groups.

TYPE OF STUDY

Meta-analysis and systematic review.

LEVEL OF EVIDENCE

Level I.

Progress in the application of machine learning in CT diagnosis of acute appendicitis

Acute appendicitis represents a prevalent condition within the spectrum of acute abdominal pathologies, exhibiting a diverse clinical presentation. Computed tomography (CT) imaging has emerged as a prospective diagnostic modality for the identification and differentiation of appendicitis. This review aims to synthesize current applications, progress, and challenges in integrating machine learning (ML) with CT for diagnosing acute appendicitis while exploring prospects. ML-driven advancements include automated detection, differential diagnosis, and severity stratification. For instance, deep learning models such as AppendiXNet achieved an AUC of 0.81 for appendicitis detection, while 3D convolutional neural networks (CNNs) demonstrated superior performance, with AUCs up to 0.95 and an accuracy of 91.5%. ML algorithms effectively differentiate appendicitis from similar conditions like diverticulitis, achieving AUCs between 0.951 and 0.972. They demonstrate remarkable proficiency in distinguishing between complex and straightforward cases through the innovative use of radiomics and hybrid models, achieving AUCs ranging from 0.80 to 0.96. Even with these advancements, challenges remain, such as the "black-box" nature of artificial intelligence, its integration into clinical workflows, and the significant resources required. Future directions emphasize interpretable models, multimodal data fusion, and cost-effective decision-support systems. By addressing these barriers, ML holds promise for refining diagnostic precision, optimizing treatment pathways, and reducing healthcare costs.

Acute Appendicitis or Appendiceal Diverticulitis? A Case Report and Systematic Literature Review

Background: Appendiceal diverticulitis is a rare and poorly understood condition of the appendix. The diagnosis of appendiceal diverticulitis is challenging due to its rarity and a clinical presentation that often mimics other ileocecal disorders. Unlike acute appendicitis, appendiceal diverticulitis may be associated with a higher risk of perforation, increased mortality, and a potential link to neoplasms. However, further research is necessary to enhance our understanding of its epidemiology, risk factors, clinical presentation, and outcomes. Case Report: A 53-year-old male presented to the emergency department with right lower abdominal pain. On physical examination, tenderness was noted in the right lower quadrant, without rebound tenderness or muscle guarding. Laboratory tests revealed leukocytosis and elevated C-reactive protein (CRP) levels. Ultrasonographic imaging of the ileocecal region suggested acute appendicitis, leading to a decision for surgical intervention. Laparoscopic exploration revealed multiple cylindrical, red, and edematous herniations, up to 4 mm in size, on the surface of the vermiform appendix. An appendectomy was performed. Histopathological examination confirmed appendiceal diverticulitis with surrounding peridiverticulitis. The surgery and early postoperative course were uneventful. Literature review: The study included 5 retrospective studies and 30 case reports, analyzing a total of 112 patients with appendiceal diverticulitis. Of these, 65.5% were male and 34.5% were female, with a median age of 49 years (IQR: 39-59). The most commonly reported clinical findings included pain in the right iliac fossa or right lower abdominal quadrant (56.5%), nausea (18.9%), vomiting (9.8%), rebound tenderness (24.6%), fever (15.6%), leukocytosis (25.4%), and elevated C-reactive protein levels (16.4%). Diagnosis was confirmed histopathologically in 86.9% of the cases via computed tomography imaging in 4.1% and ultrasonography in 1.6%. A histopathological analysis identified five neoplasms (4.1%), including two sessile serrated adenomas, two neuroendocrine carcinoids, and one mucinous tumor. Appendectomy was the treatment of choice, with no intraoperative or postoperative complications recorded and no mortality reported. The median hospital stay was 6.8 days (IQR: 3.0-6.8). Conclusions: Appendiceal diverticulitis should be considered as a differential diagnosis in patients presenting with symptoms resembling acute appendicitis. Early diagnosis and treatment are essential to reduce morbidity and mortality. Appendectomy is a safe and effective treatment approach for appendiceal diverticulitis.

An Ontology-Based Approach for Understanding Appendicectomy Processes and Associated Resources

BACKGROUND

Traditional methods for analysing surgical processes often fall short in capturing the intricate interconnectedness between clinical procedures, their execution sequences, and associated resources such as hospital infrastructure, staff, and protocols.

AIM

This study addresses this gap by developing an ontology for appendicectomy, a computational model that comprehensively represents appendicectomy processes and their resource dependencies to support informed decision making and optimise appendicectomy healthcare delivery.

METHODS

The ontology was developed using the NeON methodology, drawing knowledge from existing ontologies, scholarly literature, and de-identified patient data from local hospitals.

RESULTS

The resulting ontology comprises 108 classes, including 11 top-level classes and 96 subclasses organised across five hierarchical levels. The 11 top-level classes include "clinical procedure", "appendicectomy-related organisational protocols", "disease", "start time", "end time", "duration", "appendicectomy outcomes", "hospital infrastructure", "hospital staff", "patient", and "patient demographics". Additionally, the ontology includes 77 object and data properties to define relationships and attributes. The ontology offers a semantic, computable framework for encoding appendicectomy-specific clinical procedures and their associated resources.

CONCLUSION

By systematically representing this knowledge, this study establishes a foundation for enhancing clinical decision making, improving data integration, and ultimately advancing patient care. Future research can leverage this ontology to optimise healthcare workflows and outcomes in appendicectomy management.

Classic yet challenging case of stump appendicitis: a case report

Introduction

Stump appendicitis is a rare complication of appendectomy in which residual appendiceal tissue becomes inflamed, mimicking acute appendicitis. This case report highlights the classic clinical presentation, diagnosis, and management of stump appendicitis.

Case presentation

A 61-year-old male presented with abdominal pain and a past history of open appendectomy performed 4 years prior. Clinical examination, laboratory, and radiological findings were highly suggestive of stump appendicitis. Surgical exploration confirmed an inflamed appendiceal stump, which was resected, and the patient had an uneventful recovery postoperatively.

Discussion

Stump appendicitis is a rare but important differential diagnosis in patients with a history of appendectomy who present with acute abdominal pain. Delayed diagnosis can result in complications such as perforation and peritonitis. Imaging plays a crucial role in diagnosis, and surgical resection, typically performed through open-completion appendectomy, remains the treatment of choice.

Conclusion

Although stump appendicitis is rare, it should always be considered in patients with a prior appendectomy who present with acute abdomen. Early recognition and prompt surgical intervention are essential to prevent morbidity and mortality.

Comparison of polymeric clip and endoloop in laparoscopic appendectomy: A systematic review and meta-analysis

BACKGROUND

Appendicitis is a common surgical emergency with diverse clinical presentations, making its diagnosis challenging. Laparoscopic appendectomy has become the standard treatment, with various methods for appendiceal stump closure, including polymeric clips and endoloops. This study aims to compare the efficacy and safety of polymeric clips compared with endoloops in laparoscopic appendectomy.

METHODS

A systematic review and meta-analysis were conducted followingPreferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. PubMed, Medline, Scopus, and Embase were searched for studies up to March 25, 2024.

RESULTS

In total, 13 studies, including 6 randomized controlled trials, were analyzed. Polymeric clipping demonstrated significantly shorter surgical time compared with the endoloop (standardized mean difference 0.37, 95% confidence interval 0.22-0.53, P < .00001), with no difference in hospital stay or overall complications. However, the endoloop was associated with a greater incidence of intra-abdominal abscess (risk ratio 3.53, 95% confidence interval 1.56-8.00, P = .003). Other outcomes, including time from instrument application to appendiceal cutting, ileus, and surgical-site infection, showed no significant differences between the 2 techniques.

CONCLUSION

Polymeric clipping appears to be superior to endoloop in terms of shorter surgical time and lower risk of intra-abdominal abscess formation in laparoscopic appendectomy for uncomplicated appendicitis. However, both techniques have similar outcomes regarding hospital stay and overall complications. Further research addressing study limitations and exploring patient-centered outcomes is warranted to guide clinical practice.

Reduction of Antibiotic Prescription in Complicated Appendicitis through Behavioral Change Measures

Background  Variability in the prescription of antibiotics constitutes an area for improvement related to patient safety issues, including the risk of infection and health care efficiency based on evidence. Objectives  The study aims to evaluate the effect of an intervention to reduce the duration of antibiotic treatment in complicated appendicitis. Methods  A quality improvement program was implemented in the surgical department of The Cuban Hospital (Doha, Qatar). During a 3-month baseline period, data about antibiotic duration, consumption (daily defined doses), and cost (in Qatary Riyals) were identified, as well as during two plan-do-study-act (PDSA) intervention periods. Interventions include action focused on staff education, monitoring antibiotic use, feedback, and reminders during discharge planning. Results  At baseline, 13 patients with complicated appendicitis were documented, while there were 41 and 15 patients during PDSA cycles 1 and 2, respectively. A 29.5% reduction in days of antibiotic treatment was observed during the PDSA cycle 2 in comparison with the baseline. Accordingly, a reduction of 38.7% in the consumption of antibiotics and a reduction of 24.6% in cost were observed, with no adverse outcomes for patients during the 30-day follow-up period. Conclusion  The intervention resulted in an improvement in antibiotic use with satisfactory patient outcomes and an additional effect on the efficiency of health care and the prevention of microbial resistance and other adverse effects.

Internal and external factors affecting the performance score of surgical trainees doing laparoscopic appendectomy: a prospective, observational cohort study in a structured training programme

BACKGROUND

Laparoscopic appendectomy is a common procedure and introduced early in general surgical training. How internal (i.e. surgeon's experience) or external (i.e. disease severity) may affect procedure performance is not well-studied. The aim of this study was to evaluate factors that may have an influence on the performance scores for surgical trainees.

METHODS

A prospective, observational cohort study of laparoscopic appendectomies performed by surgical trainees (experience < 4 years) operating under supervision. Trainers evaluated trainees' overall performance on a 6-point scale for proficiency. Perioperative data were recorded, including appendicitis severity, operating time and the overall difficulty of the procedure as assessed by the trainer. A "Challenging" procedure was defined as a combination of either/or "perforation" and "difficult". Trainees who had performed > 30 appendectomies were defined as "experienced". The trainees were asked if they had used simulation or web-based tools the week prior to surgery.

RESULTS

142 procedure evaluation forms were included of which 19 (13%) were "perforated", 14 (10%) "difficult" and 24 (17%) "Challenging". Perforated appendicitis was strongly associated with procedure difficulty (OR 21.2, 95% CI 6.0-75.6). Experienced trainees performed "proficient" more often than non-experienced (OR 34.5, 95% CI 6.8-176.5). "Difficult" procedures were inversely associated with proficiency (OR 0.1, 95% CI 0.0-0.9). In "Challenging" procedures, identifying the appendix had lowest proficiency (OR 0.4, 95% CI 0.1-0.9). The procedures assessed as "difficult" had significantly longer operating time with a median (IQR) of 90 (75-100) min compared to 59 (25-120) min for the non-difficult (p < 0.001).

CONCLUSION

Both internal and external factors contribute to the performance score. Perforated appendicitis, technical difficult procedures and trainee experience all play a role, but a "difficult" procedure had most overall impact on proficiency evaluation.

Mining and exploration of appendicitis nursing targets: An observational study

Appendicitis is an inflammation caused by obstruction of the appendiceal lumen or termination of blood supply leading to appendiceal necrosis followed by secondary bacterial infection. The relationship between TYROBP gene and the nursing of appendicitis remains unclear. The appendicitis dataset GSE9579 profile was downloaded from the gene expression omnibus database generated from GPL571. Differentially expressed genes were screened, followed by weighted gene co-expression network analysis, functional enrichment analysis, gene set enrichment analysis, construction and analysis of protein-protein interaction network, Comparative Toxicogenomics Database analysis, and immune infiltration analysis. Heatmaps of gene expression levels were plotted. A total of 1570 differentially expressed genes were identified. According to gene ontology analysis, they were mainly enriched in organic acid metabolic process, condensed chromosome kinetochore, oxidoreductase activity. In Kyoto Encyclopedia of Gene and Genome analysis, they mainly concentrated in metabolic pathways, P53 signaling pathway, PPAR signaling pathway. The soft threshold power in weighted gene co-expression network analysis was set to 12. Through the construction and analysis of protein-protein interaction network, 5 core genes (FCGR2A, IL1B, ITGAM, TLR2, TYROBP) were obtained. Heatmap of core gene expression levels revealed high expression of TYROBP in appendicitis samples. Comparative Toxicogenomics Database analysis found that core genes (FCGR2A, IL1B, ITGAM, TLR2, TYROBP) were closely related to abdominal pain, gastrointestinal dysfunction, fever, and inflammation occurrence. TYROBP gene is highly expressed in appendicitis, and higher expression of TYROBP gene indicates worse prognosis. TYROBP may serve as a molecular target for appendicitis and its nursing.

SAGES guideline for the diagnosis and treatment of appendicitis

BACKGROUND

Appendicitis is an extremely common disease with a variety of medical and surgical treatment approaches. A multidisciplinary expert panel was convened to develop evidence-based recommendations to support clinicians and patients in decisions regarding the diagnosis and treatment of appendicitis.

METHODS

A systematic review was conducted from 2010 to 2022 to answer 8 key questions relating to the diagnosis of appendicitis, operative or nonoperative management, and specific technical and post-operative issues for appendectomy. The results of this systematic review were then presented to a panel of adult and pediatric surgeons. Evidence-based recommendations were formulated using the GRADE methodology by subject experts.

RESULTS

Conditional recommendations were made in favor of uncomplicated and complicated appendicitis being managed operatively, either delayed (>12h) or immediate operation (<12h), either suction and lavage or suction alone, no routine drain placement, treatment with short-term antibiotics postoperatively for complicated appendicitis, and complicated appendicitis previously treated nonoperatively undergoing interval appendectomy. A conditional recommendation signals that the benefits of adhering to a recommendation probably outweigh the harms although it does also indicate uncertainty.

CONCLUSIONS

These recommendations should provide guidance with regard to current controversies in appendicitis. The panel also highlighted future research opportunities where the evidence base can be strengthened.