Acute Appendicitis in Children Younger than Five Years of Age: Diagnostic Challenge for Pediatric Surgeons

Trends and levels of the global, regional, and national burden of appendicitis between 1990 and 2021: findings from the Global Burden of Disease Study 2021

BACKGROUND

Appendicitis is a common surgical emergency that poses a large clinical and economic burden. Understanding the global burden of appendicitis is crucial for evaluating unmet needs and implementing and scaling up intervention services to reduce adverse health outcomes. This study aims to provide a comprehensive assessment of the global, regional, and national burden of appendicitis, by age and sex, from 1990 to 2021.

METHODS

Vital registration and verbal autopsy data, the Cause of Death Ensemble model (CODEm), and demographic estimates from the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) were used to estimate cause-specific mortality rates (CSMRs) for appendicitis. Incidence data were extracted from insurance claims and inpatient discharge sources and analysed with disease modelling meta-regression, version 2.1 (DisMod-MR 2.1). Years of life lost (YLLs) were estimated by combining death counts with standard life expectancy at the age of death. Years lived with disability (YLDs) were estimated by multiplying incidence estimates by an average disease duration of 2 weeks and a disability weight for abdominal pain. YLLs and YLDs were summed to estimate disability-adjusted life-years (DALYs).

FINDINGS

In 2021, the global age-standardised mortality rate of appendicitis was 0·358 (95% uncertainty interval [UI] 0·311-0·414) per 100 000. Mortality rates ranged from 1·01 (0·895-1·13) per 100 000 in central Latin America to 0·054 (0·0464-0·0617) per 100 000 in high-income Asia Pacific. The global age-standardised incidence rate of appendicitis in 2021 was 214 (174-274) per 100 000, corresponding to 17 million (13·8-21·6) new cases. The incidence rate was the highest in high-income Asia Pacific, at 364 (286-475) per 100 000 and the lowest in western sub-Saharan Africa, at 81·4 (63·9-109) per 100 000. The global age-standardised rates of mortality, incidence, YLLs, YLDs, and DALYs due to appendicitis decreased steadily between 1990 and 2021, with the largest reduction in mortality and YLL rates. The global annualised rate of decline in the DALY rate was greatest in children younger than the age of 10 years. Although mortality rates due to appendicitis decreased in all regions, there were large regional variations in the temporal trend in incidence. Although the global age-standardised incidence rate of appendicitis has steadily decreased between 1990 and 2021, almost half of GBD regions saw an increase of greater than 10% in their age-standardised incidence rates.

INTERPRETATION

Slow but promising progress has been observed in reducing the overall burden of appendicitis in all regions. However, there are important geographical variations in appendicitis incidence and mortality, and the relationship between these measures suggests that many people still do not have access to quality health care. As the incidence of appendicitis is rising in many parts of the world, countries should prepare their health-care infrastructure for timely, high-quality diagnosis and treatment. Given the risk that improved diagnosis may counterintuitively drive apparent rising trends in incidence, these efforts should be coupled with improved data collection, which will also be crucial for understanding trends and developing targeted interventions.

FUNDING

Bill and Melinda Gates Foundation.

Determination of Risk Factors for Nausea and Vomiting in Children After Appendectomy

PURPOSE

This study aimed at investigating the risk factors for postoperative nausea and vomiting (PONV) in pediatric patients undergoing appendectomy.

DESIGN

This is a prospective, descriptive, cross-sectional study.

METHODS

The study involved 163 children aged 5 to 18 years who underwent appendectomy in the pediatric surgery clinic of a tertiary hospital between December 2022 and June 2023. The study data were collected through the patient information form, Baxter Retching Faces scale, and Wong-Baker Faces Pain Rating Scale, which included questions about the descriptive and clinical characteristics of the participants and was prepared by the researcher consistent with the literature.

FINDINGS

A significant relationship was observed between the severity of postoperative pain and the occurrence of PONV in patients with both nonperforated and perforated appendicitis (P < .001). In addition, operative time and the time to the first oral feeding were shorter in patients with nonperforated appendicitis in the non-PONV group (P = .005 and P = .042, respectively) Logistic regression analysis revealed that postoperative pain, family history of PONV and appendix perforation were risk factors for PONV in children with both nonperforated and perforated appendicitis (P < .001, P = .040, and P < .001, respectively).

CONCLUSIONS

In children undergoing appendectomy, family history of PONV, severity of postoperative pain, increased operative time, and increased transition time to oral feeding are risk factors for PONV. Pediatric nurses, who have an important role in the management of PONV, should evaluate patients in terms of PONV risk in the preoperative period within the scope of evidence-based practices and perform pharmacological or nonpharmacological interventions according to the degree of risk.

Infant Appendicitis: A Case Presentation of Appendicitis in a Nine-Month-Old Infant With Respiratory Syncytial Virus (RSV) and Otitis Media and Review of Literature

Appendicitis in children < 5 years old is uncommon and even less common in children < 1 year old. Symptoms of appendicitis can be non-specific and mimic other common pediatric diseases, causing delays in diagnosis. Without a timely diagnosis, young children with appendicitis are at risk of developing worsening disease, intra-abdominal abscess, perforation, and bacteremia.  We submit a case of a nine-month-old male infant presenting with fever, vomiting, and irritability seen the day prior and treated for otitis media, who was ultimately diagnosed with appendicitis with concomitant viral infection (respiratory syncytial virus and human rhinovirus/enterovirus) and treated with intravenous antibiotics and laparoscopic appendectomy.  This case illustrates how easy it is to misdiagnose infant appendicitis due to factors including normal developmental speech barriers, nonspecific presentations, and overlap of symptoms with many other common childhood illnesses, along with a challenging abdominal examination. Delay in diagnosis leads to increased rates of perforation and complications. Providers should trust abnormal physical examination findings, especially abdominal guarding against palpation, and keep a wide differential diagnosis in order to diagnose appendicitis in young children.

Trends in Simple and Complex Appendicitis in Children and the Potential Correlation to Common Viral Pathogens-A Retrospective Cohort Study between 2010 and 2019 in The Netherlands

The aim of this study was to evaluate the annual, seasonal and monthly trends in children with simple and complex appendicitis and their correlation to common viral pathogens in the Netherlands. A consecutive multicenter retrospective cohort study was performed between 2010 and 2019 including children (<18 years) surgically treated for appendicitis. The primary outcome was the distribution of children with simple and complex appendicitis per year, season and month. Relevant seasonal variation was defined as ≥5%. The secondary outcome was a positive correlation of the number of patients with simple and complex appendicitis to common viral pathogens (data anonymously provided by the Dutch Working Group on Clinical Virology from the Dutch Society for Clinical Microbiology (NVMM)). In total, 896 patients were included: N = 524 (58%) patients with simple and N = 372 (42%) with complex appendicitis. Of the children aged 0-5 years, 81% had complex appendicitis, versus 38% in 6-18 years (p < 0.001). An overall decline was demonstrated for both simple and complex appendicitis between 2010 and 2019. No seasonal variation was found for simple appendicitis. For complex appendicitis, the highest number of patients was found in spring, and lowest in summer (N = 372, spring 28.2 ± 5.1% versus summer 21.0 ± 5.8%, p = 0.011), but the variance was regarded as not relevant (<5% from baseline). A positive correlation was found between complex appendicitis with Adenovirus 40.41 (R = 0.356, 95%CI 0.045-0.604, p = 0.026) and simple appendicitis with Adenovirus NON 40.41 (R = 0.332, 95%CI 0.019-0.586, p = 0.039), but these correlations did not remain significant after a Bonferroni correction (p < 0.003). In conclusion, we found no relevant seasonal variation for simple or complex appendicitis, nor positive correlation with common viral pathogens.

Acute appendicitis in children: is preoperative hyponatremia a predictive factor of perforation/gangrene? A prospective study

PURPOSE

Distinguishing between perforated/gangrenous from uncomplicated appendicitis in children helps management. We evaluated hyponatremia as a new diagnostic marker for perforated/gangrenous appendicitis in children.

METHODS

A prospective study including all children with acute appendicitis who underwent appendectomy at our institution from May 2021 to May 2023. Medical history and clinical criteria were analyzed. All blood samples were taken upon admission including serum inflammatory markers and electrolytes. Patients were divided into two groups (Group I: uncomplicated and Group II: perforated/gangrenous), and data between both groups were compared.

RESULTS

The study included 153 patients [Group I: 111 (73%), Group II: 42 (27%)]. Mean serum sodium concentration in children with perforated/gangrenous appendicitis was significantly lower compared to children with uncomplicated appendicitis (131.8 mmol/L vs. 138.7 mmol/L; p < 0.001). The ROC curve of preoperative sodium level to differentiate between perforated/gangrenous and uncomplicated appendicitis revealed an AUC of 0.981. The cut-off-value of sodium level < 135 mmol/L identified perforated/gangrenous appendicitis with a sensitivity of 94% and a specificity of 91% (p < 0.001). Predictive factors of perforated/gangrenous appendicitis were: age less than 5 years (12% vs. 3%; p = 0.02), experiencing symptoms for more than 24 h (100% vs. 58%; p < 0.001), body temperature more than 38.5 °C (52% vs. 13%; p < 0.001), a serum sodium level less than 135 mmol/L (90% vs. 6%; p < 0.001), and a CRP serum level more than 50 mg/L (71% vs. 17%; p < 0.001).

CONCLUSIONS

Hyponatremia, upon admission, is a novel, objective biochemical marker that can identify perforated/gangrenous appendicitis in children. We advocate that the assessment of serum sodium level should be added to the diagnostic algorithm in children with suspected acute appendicitis. Surgical intervention in patients with hyponatremia should not be delayed, and non-operative management should be avoided.

Reasons for Delayed Diagnosis of Pediatric Acute Appendicitis during the COVID-19 Era: A Narrative Review

Global pandemics cause health system disruptions. The inadvertent disruption in surgical emergency care during the Coronavirus Disease 2019 (COVID-19) pandemic has been the topic of several published studies. Our aim was to summarize the reasons that led to the delayed diagnosis of pediatric appendicitis during the COVID-19 era. This systematic literature search evaluated studies containing pediatric appendicitis patient data regarding outcomes, times to hospital admission or times from symptom onset to emergency department visit. Studies elucidating reasons for delays in the management of pediatric appendicitis were also reviewed. Ultimately, 42 studies were included. Several reasons for delayed diagnosis are analyzed such as changes to public health measures, fear of exposure to COVID-19, increased use of telemedicine, COVID-19 infection with concurrent acute appendicitis, recurrence of appendicitis after non-operative management and increased time to intraoperative diagnosis. Time to hospital admission in conjunction with patient outcomes was extracted and analyzed as an indicative measure of delayed management. Delayed diagnosis of acute appendicitis has been documented in many studies with various effects on outcomes. Suspicion of pediatric acute appendicitis must always lead to prompt medical examination, regardless of pandemic status. Telemedicine can be valuable if properly applied. Data from this era can guide future health system policies.

Predicting Complicated Appendicitis in Children: Pros and Cons of a New Score Combining Clinical Signs, Laboratory Values, and Ultrasound Images (CLU Score)

BACKGROUND

This retrospective study aimed to combine the clinical signs, laboratory values, and ultrasound images of 199 children with acute appendicitis in order to create a new predictive score for complicated appendicitis in children.

METHODS

The study included children who had clinical examination of abdominal pain (description of pain, anorexia, body temperature, nausea or vomiting, duration of symptoms), laboratory findings on admission (white blood cell, platelets, neutrophils, C-reactive protein), preoperative abdominal ultrasound, and histopathological report after an operation for appendicitis in their records during the period from January 2016 to February 2022.

RESULTS

According to the statistical analysis of the values using multivariate logistic regression models, the patients with appendiceal diameter ≥ 8.45 mm, no target sign appearance, appendicolith, abscess, peritonitis, neutrophils ≥ 78.95%, C-reactive protein ≥ 1.99 mg/dL, body temperature ≥ 38 °C, pain migration to right lower quadrant, and duration of symptoms < 24 h were more likely to suffer from complicated appendicitis. The new score was comprised of the 10 variables that were found statistically significant in the multivariate logistic model. Each of these variables was assigned a score of 1 due to the values that were associated with complicated appendicitis.

CONCLUSIONS

A cutoff value of ≥4 has been a good indicator of the final score. The sensitivity with the usage of this score is 81.1%, the specificity 82.4%, the PPV 73.2%, the NPV approaches 88% and finally the accuracy is 81.9%. Also, the pros and cons of this score are discussed in this study.

Diagnostic Accuracy of Leucine-Rich α-2-Glycoprotein 1 as a Non-Invasive Salivary Biomarker in Pediatric Appendicitis

The aim of this study is to evaluate the diagnostic accuracy of leucine-rich α-2-glycoprotein 1 (LRG1) in saliva as a novel biomarker for acute appendicitis in the pediatric population. From October 2021 to June 2022, 92 children aged 5 to 17 years who presented with acute abdomen and suspected acute appendicitis were enrolled in this prospective study. The parameters documented included demographic and clinical information, as well as operative and postoperative data. Patients were divided into two groups: those with acute appendicitis who underwent laparoscopic appendectomy (n = 46) and those without appendicitis (n = 46). The total white blood cell (WBC) count, percent of neutrophils, C-reactive protein (CRP) level, and salivary LRG1 were compared between groups. A commercially available enzyme-linked immunosorbent assay (ELISA) LRG kit was used to measure the LRG levels. The median salivary LRG1 level was significantly higher in the group of children with pathohistologically confirmed acute appendicitis compared to the control group: 233.45 ng/mL (IQR 114.9, 531.2) vs. 55.95 ng/mL (IQR 51.5, 117.9), p < 0.001. LRG1 had an overall good receiver-operator characteristic area under the curve of 0.85 (95% CI 0.76-0.92; p < 0.001). The optimal LRG1 cutoff with best separation between acute appendicitis and the controls was >352.6 ng/mL (95% CI from >270.7 to >352.6). Although the specificity was 100% at this cutoff, the sensitivity for identifying appendicitis was 36%. In addition, a significant difference was found between groups in the laboratory values of all inflammatory markers tested: WBC, absolute neutrophil count, and CRP (p < 0.001 for all). Although LRG1 in saliva showed a good AUC parameter and significantly higher values in patients with acute appendicitis compared to the controls, its usefulness in the patient population who present at emergency departments with abdominal pain is debatable. Future studies should focus on investigating its diagnostic potential.

Diagnostic Utility of Serum Leucine-Rich α-2-Glycoprotein 1 for Acute Appendicitis in Children

PURPOSE

The aim of this study is to assess the diagnostic utility of serum leucine-rich α-2-glycoprotein 1 (LRG1) in pediatric patients with acute abdominal pain, admitted to the emergency surgical unit, in order to make a prompt and accurate diagnosis of acute appendicitis.

PATIENTS AND METHODS

Pediatric patients older than 5 years of age who presented to the emergency department from 15 October 2021 to 30 June 2022 with acute abdominal pain and suspected acute appendicitis were prospectively recruited in the study. Demographic and clinical data, as well as operative and postoperative data, were recorded. A total of 92 patients were equally distributed into two groups: children with acute appendicitis who underwent laparoscopic appendectomy and non-appendicitis patients, presenting with non-specific abdominal pain. LRG1 levels were determined using a commercially available LRG1 enzyme-linked immunosorbent assay (ELISA) kit. Serum LRG1 levels, as well as other inflammatory markers (white blood cell count (WBC), C-reactive protein (CRP) and absolute neutrophil count) were compared between groups.

RESULTS

The median level of LRG1 in serum was significantly higher in the group of children with pathohistologically confirmed acute appendicitis than in the control group, at 350.3 µg/mL (interquartile range (IQR) 165.2-560.3) and 25.7 µg/mL (IQR 14.7-36.8) (p < 0.001), respectively. Receiver operating characteristic area under the curve for LRG1 from serum was 1.0 (95% CI 0.96-1.00; p < 0.001) and the value of >69.1 µg/mL was found to perfectly separate acute appendicitis cases from controls. Additionally, as expected, each of the examined laboratory inflammatory markers provided a significantly higher values in the acute appendicitis group compared to the control group: WBC 14.6 × 10⁹/L (IQR 12.7, 18.7) vs. 7.0 × 10⁹/L (IQR 5.4, 9.0) (p < 0.001), CRP 16.3 mg/dL (IQR 6.9, 50.4) vs. 2.2 mg/dL (IQR 2, 2) (p < 0.001) and absolute neutrophil count 84.6% (IQR 79.5, 89.0) vs. 59.5% (IQR 51.5, 68.6) (p < 0.001).

CONCLUSIONS

LRG1 in the serum was found to be a promising novel biomarker, with excellent differentiation of acute appendicitis from non-appendicitis cases in children presenting with non-specific abdominal pain.

Covid-19 Pandemic Strategy for Treatment of Acute Uncomplicated Appendicitis with Antibiotics- Risk Categorization and Shared Decision-Making

BACKGROUND

During the Coronavirus disease 2019 (COVID-19) pandemic, a protocol was adopted by our department on antibiotics treatment for Acute Uncomplicated Appendicitis (AUA). Our study aimed to determine the feasibility and safety of non-operative treatment (NOT), compared to upfront laparoscopic appendectomy (LA), for AUA in children during the pandemic.

METHOD

Our prospective comparative study was conducted from May 1, 2020 to January 31, 2021. Patient selection criteria included: age ≥5 years, abdominal pain duration ≤48 h, ultrasound (US)/Computered Tomography scan confirmation of AUA, US appendiceal diameter 6-11 mm with no features of perforation/abscess collection and no faecolith. For NOT patients, intravenous antibiotics were administered for 24-48 h followed by oral for 10-day course. Comparison was performed between patients whose parents preferred NOT to those who opted for up-front appendectomy. Primary outcomes were NOT success at index admission, early and late NOT failure rates till 27 months. Secondary outcomes were differences in complication rate, hospital length of stay (LOS) and cost between groups.

RESULTS

77 patients were recruited: 43 (55.8%) underwent NOT while 34 (44.2%) patients opted for LA. Success of NOT at index admission was 90.7% (39/43). Overall, NOT failure rate at 27 months' follow-up was 37.2% (16/43). Of the NOT failures, 1 appendix was normal on histology while only 1 was perforated. There were no significant differences in secondary outcomes between both groups except for LOS of late NOT failure. Cost for upfront LA was nearly thrice that of NOT.

CONCLUSION

Our stringent COVID protocol together with shared decision-making with parents is a safe and feasible treatment option during a crisis situation.

LEVEL OF EVIDENCE

Treatment study, Level II.

Diagnostic value of monocyte-lymphocyte ratio and red cell distribution width- lymphocyte ratio against other biomarkers in children with acute appendicitis, cross-sectional study

Our study aims to ascertain the diagnostic value of the Monocyte-lymphocyte ratio (MLR) and red cell distribution width (RDW)-lymphocyte ratio (RLR) by comparing them with other biomarkers in distinguishing patients with and without acute appendicitis (AA). A total of 223 children were recruited in the study conducted according to the Cross-Sectional Study design. Patients under 18 years were assigned to 3 groups; AA, nonspecific abdominal pain (NAP), and a control group. According to the outcome of our research, while C-reactive protein (CRP), white blood cell (WBC), neutrophil count (NEU), neutrophil to lymphocyte ratio (NLR), and MLR had excellent diagnostic power, RLR had acceptable diagnostic power, and platelet to lymphocyte ratio (PLR) had only fair diagnostic power. MLR and NLR, which are simple, inexpensive, and easily accessible parameters, can be recommended to be used together with other biomarkers in diagnosing AA in children.

Systematic review and meta-analysis comparing perioperative outcomes of pediatric emergency appendicectomy performed by trainee vs trained surgeon

Appendicectomy is a common pediatric surgical procedure performed by trainees and surgeons with varying reported outcomes. It is a benchmark procedure for trainee progression and training benefits should be weighed against patient safety and perioperative outcomes. This systematic review and meta-analysis investigated any differential perioperative outcomes dependent on the grade of the operating surgeon. A systematic literature review and meta-analysis were performed comparing outcomes of pediatric appendicectomy performed by trainees versus trained surgeons. Of 2,086 articles screened, 5 retrospective non-randomized comparative studies reporting on 10,019 participants were analyzed. There was no difference in overall complications (OR 0.92; 95% CI 0.76, 1.12; P = 0.42), major complications [Clavien-Dindo (CD) III/IV] (OR 1.18; 95% CI 0.71, 1.97; P = 0.52), minor complications (CD I/II) (OR 1.13; 95% CI 0.57, 2.27; P = 0.72), post-op ileus (OR 0.74; 95% CI 0.10, 5.26; P = 0.76), wound infections (OR 0.87; 95% CI 0.62, 1.21; P = 0.41), abscess formation (OR 0.58; 95% CI 0.28, 1.22; P = 0.15), operation times [Mean Difference (MD) 2.31 min; 95% CI - 4.94, 9.56; P = 0.53] and reoperation rate (OR 1.22; 95% CI 0.23, 6.42; P = 0.81). Trainees had fewer conversions to open appendicectomy (OR 0.14; 95% CI 0.02, 0.88; P = 0.04). Appendicectomy performed on pediatric patients by trainees did not compromise patient safety. LEVEL OF EVIDENCE: III.

Same-Day Discharge after Laparoscopic Appendectomy for Simple Appendicitis in Pediatric Patients—Is It Possible?

(1) Background: One-day surgery has been widely adopted for many elective laparoscopic procedures in pediatric patients. Recently, the same protocol has been investigated for some emergency procedures, such as laparoscopic appendectomy. This study aimed to evaluate the safety and effectiveness of discharge from hospital within 24 h in pediatric patients who received laparoscopic appendectomy for uncomplicated acute appendicitis. (2) Methods: From 1 March 2021 to 1 May 2022, a total of 180 pediatric patients who were discharged from hospital within 24 h after laparoscopic appendectomy for uncomplicated appendicitis were included in this prospective single-center study. The primary outcome of this study was the safety of discharge from hospital within 24 h after laparoscopic appendectomy for uncomplicated appendicitis, as well as the parental satisfaction with this protocol. Secondary outcomes included the rate of readmission or unplanned return to the operating room, the complication rate and a cost-effectiveness analysis. For each patient, demographic data, preoperative evaluation (physical examination, laboratory data, imaging), duration of surgery, intraoperative and postoperative complications, length of hospital stay and pain levels, as well as parental satisfaction with this protocol, were recorded. (3) Results: The median age was 11 years (interquartile range (IQR) 10, 14). The majority of the patients (63.8%) were males. The median length of hospital stay after surgery was 15 h (IQR 12, 19). The highest level of satisfaction, at discharge, was recorded in most of the respondents (n = 155, 86.1%), while the remaining 25 (13.9%) expressed moderate levels of satisfaction. The median pain levels according to a visual analogue scale for all postoperative days were low (range 0–4). In four patients (2.2%), unplanned readmission before the seventh postoperative day because of postoperative intraabdominal abscess was recorded. All patients with abscess formation were treated conservatively. The majority of the parents (n = 175; 97.2%) expressed the highest level of satisfaction during the outpatient follow-up examination on the seventh postoperative day. (4) Conclusions: Same-day discharge after laparoscopic appendectomy for simple appendicitis in pediatric patients was safe and feasible. Parental satisfaction with this protocol was very high. With the right protocol and parent education, pediatric patients who underwent laparoscopic appendectomy because of non-complicated acute appendicitis may be successfully treated in this way.

Hyponatremia-A New Diagnostic Marker for Complicated Acute Appendicitis in Children: A Systematic Review and Meta-Analysis

Background: Acute appendicitis in the pediatric population remains a diagnostic challenge for clinicians. Despite many biochemical markers, imaging modalities and scoring systems, initial misdiagnosis and complication rates are high in children. This suggests the need for investigations directed towards new diagnostic tools to aid in the diagnosis. Recent studies have shown a correlation between serum sodium levels and complicated appendicitis. Although the exact reasons for hyponatremia in patients with complicated appendicitis are not known, there is persuasive data to support the role of pro-inflammatory cytokines such as IL-6 in the non-osmotic release of antidiuretic hormone. This meta-analysis aims to investigate all available data on hyponatremia as a diagnostic marker of complicated appendicitis in the pediatric population. Methods: The literature search was conducted by two independent investigators according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The scientific databases (PubMed, EMBASE, Web of Science, and Scopus) were systematically searched for relevant studies using the keywords (hyponatremia) AND (appendicitis) AND (children). The methodological quality was assessed using a validated scale, and RevMan 5.4 software was utilized for pooled analysis. Results: Seven studies were included in the final meta-analysis, five of which were retrospective. A total of 1615 and 2808 cases were distributed into two groups: group A with complicated appendicitis and group B with uncomplicated acute appendicitis, respectively. The studies compared serum sodium levels of patients among the groups. Pooling the data demonstrated significantly lower serum sodium levels in children with complicated appendicitis vs. the non-complicated appendicitis (WMD: −3.29, 95% CI = −4.52 to −2.07, p < 0.00001). The estimated heterogeneity among the included studies was substantial and statistically significant (I2 = 98%, p < 0.00001). Conclusion: The results of the present meta-analysis indicate that hyponatremia has potential to be utilized as a biochemical marker in the diagnosis of complicated appendicitis in the pediatric population. However, well designed prospective diagnostic efficiency studies are essential to consolidate the association between hyponatremia and complicated acute appendicitis.

Utility of Red Cell Distribution Width (RDW) as a Noninvasive Biomarker for the Diagnosis of Acute Appendicitis: A Systematic Review and Meta-Analysis of 5222 Cases

Background: Despite great advances in medicine, numerous available laboratory markers, and radiological imaging, the diagnosis of acute appendicitis (AA) in some cases still remains controversial and challenging for clinicians. Because of that, clinicians are still looking for an ideal marker that would be specific to AA. The red blood cell distribution width (RDW) has been recently investigated in several studies as a potential biomarker for AA. The aim of this systematic review and meta-analysis was to systematically summarize and compare all relevant data on RDW as a diagnostic biomarker for AA. Methods: This systematic review and meta-analysis were performed as per the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Scientific databases (PubMed, Scopus, Web of Science, and Excerpta Medica database—EMBASE) were systematically searched for relevant comparative studies by two independent researches using keywords ((red cell distribution width) OR rdw) AND (appendicitis). An independent assessment of the methodological quality was performed by two authors using the Downs and Black scale. RevMan 5.4 software was used to perform the meta-analysis. Results: Fifteen studies were included in the final meta-analysis; the majority of the studies was retrospective. Nine studies compared the RDW values between AA and non-AA; four studies compared the same between AA and healthy controls, while two studies compared the RDW values among all three groups. The estimated heterogeneity among the studies for all outcome was statistically significant (I2 = 92−99%, p < 0.00001). The pooling the data demonstrated no statistically significant difference in the RDW values (weighted mean difference (WMD) = 0.03, 95% CI = (−0.46, 0.52), p = 0.91) between AA and healthy controls as well as between AA and non-AA cases (WMD = 0.23, 95%CI = (−0.19, 0.65), p = 0.28). A separate subanalysis was performed to evaluate the utility of this biomarker for the pediatric age group. Pooling the data demonstrated no significant difference among the AA and non-AA groups in terms of the RDW values (WMD = 0.99, 95% CI = (−0.35, 2.33), p = 0.15). Conclusion: The RDW value difference demonstrated no statistically significant difference in AA versus healthy individuals and AA versus non-AA individuals. At the moment, there is no evidence of RDW utility in diagnostic testing of AA. Further research with prospective, multicenter studies and studies targeting special patient groups with a large sample size are needed in this field.

Keep it Simple, Laboratory Parameters to Predict Complicated Acute Appendicitis in Children Younger Than Five Years

BACKGROUND

The clinical presentation of acute appendicitis in the youngest age lacks specific signs and symptoms, and it is difficult to obtain an accurate clinical diagnosis. Once the diagnosis is made, it is necessary to determine if the appendicitis is simple and able to be managed non-surgically, or complicated, therefore requiring surgery. Together with the clinical picture and imaging, routine laboratory values play a vital role in this decision. The aim of this study is to evaluate routine blood in their ability to differentiate between complicated and uncomplicated acute appendicitis.

METHOD

A retrospective analysis was conducted from a single pediatric surgery department of all children 5 years of age or younger who underwent surgery for acute appendicitis between the years 2010-2020.

RESULTS

728 children were diagnosed with acute appendicitis, and 42 children were under the age of 5 years. There was a significant difference in the C-reactive protein, white blood cell count, neutrophil/lymphocyte ratio, and platelet/lymphocyte ratio in the complicated group versus the uncomplicated group. The value of these together for prediction complicated appendicitis were 84.8% sensitivity, 80.9% specificity, 82.8% positive predictive value, and 72.8% negative predictive value. These values were all higher than both the Alvarado score and the PAS (P  <  .05).

CONCLUSIONS

C-reactive protein, neutrophil/lymphocyte ratio, and platelet/lymphocyte ratio are simple laboratory parameters that can help identify complicated versus uncomplicated appendicitis in children 5 years old or younger. These universal parameters may help guide the treatment and decision to operate on a difficult to diagnose population.

Presurgical time and associated factors as predictors of acute perforated appendicitis: a prospective cohort study in a teaching pediatric hospital in Colombia

Background

We aim to determine the association between out and in-hospital factors with time, from the beginning of the symptoms to the surgery, in patients with acute appendicitis treated at Fundación Hospital Pediatrico La Misericordia (HOMI) in Colombia.

Methods

Eleven month prospective cohort study of pediatric patients at HOMI with acute appendicitis diagnosis taken to surgery. Data from the out-of-hospital phase was collected by surveying parents, and the data regarding the in-hospital phase was completed with medical records. We analyzed the association between the time from the beginning of the symptoms to the surgery, and out and in-hospital factors associated with this time using generalized linear models.

Results

Eight hundred three patients were included in the study. Total pre-surgical time was longer in perforated appendicitis (PA) group (2.65 days, standard deviation (SD) 1.88 vs. 2.04 days, SD 1.45) (p < 0.01). Factors associated with longer total and out-of-hospital presurgical times were age under 4 years old, lower socioeconomic status, father as a caregiver, self-medication, and underestimating disease severity.

Conclusions

Out-of-hospital timing determines the longer pre-surgical time in complicated appendicitis. Younger age and lower socioeconomic status affect time significantly. We suggest the implementation of strategies in order to lower prehospital time, rates, and costs of complicated appendicitis.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12887-022-03121-8.

Diagnostic accuracy of laboratory markers for diagnosis of acute appendicitis in children

BACKGROUND

Acute appendicitis (AA), the most common abdominal emergency disease, is one of the most important causes of hospitalization of children. Studies have shown that white blood cell (WBC) count, mean platelet volume (MPV), C‑reactive protein (CRP), and erythrocyte sedimentation rate (ESR) can play an important role in the diagnostic prediction of appendicitis. Therefore, the aim of this study was to evaluate the diagnostic value of WBC count, polymorphonuclear leukocytes (PMNs) percentage, MPV, CRP, and ESR for the diagnosis of AA.

METHODS

In this study, 100 medical records were reviewed for children referred to the hospital complaining of abdominal pain and who underwent operation with a provisional diagnosis of acute appendicitis based on clinical and laboratory findings. Patients were divided into two groups according to the pathology gold standard method: AA and the other group with acute abdominal pain without appendicitis (AAP). The diagnostic accuracy of WBC, PMNs%, MPV, ESR, and CRP were compared for patients with AA and AAP.

RESULTS

A total of 100 patients (50 with AA and 50 with AAP) were identified. The sensitivity and specificity of WBC and PMNs% were 78 and 66%, and 76 and 54%, respectively; ESR was 80 and 48%, respectively; and CRP was 82 and 62% (30-89%), respectively. A low specificity (8%) and 70% sensitivity was calculated using the cutoff point of 8.1 fl for MPV.

CONCLUSION

Our data suggest that children with AA often present with significantly higher WBC count, ESR level, CRP level, PMNs%, and lower MPV level. The results of the study showed that WBC, CRP, and ESR, along with other diagnostic methods, can be useful in diagnosing AA in children. MPV is not effective in the diagnosis of AA due to its specificity; however, a significantly lower level was found in children with AA.

Incidence of Complicated Appendicitis during the COVID-19 Pandemic versus the Pre-Pandemic Period: A Systematic Review and Meta-Analysis of 2782 Pediatric Appendectomies

BACKGROUND

The Coronavirus Disease 2019 (COVID-19) pandemic has impacted volume, management strategies and patient outcomes of acute appendicitis. The aim of this systematic review and meta-analysis was to evaluate whether the COVID-19 pandemic resulted in higher incidence of complicated appendicitis in children presenting with acute appendicitis compared to the pre-COVID-19 period. The secondary aim was to investigate the proportion of the patients treated by non-operative management (NOM).

METHODS

A systematic search of four scientific databases was performed. The search terms used were (coronavirus OR SARS-CoV-2 OR COVID-19 OR novel coronavirus) AND (appendicitis). The inclusion criteria were all patients aged <18 years and diagnosed with acute appendicitis during the COVID-19 and pre-COVID-19 periods. The proportion of children presenting with complicated appendicitis and the proportion of children managed by NOM was compared between the two groups. The Downs and Black scale was used for methodological quality assessment.

RESULTS

The present meta-analysis included thirteen studies (twelve retrospective studies and one cross-sectional study). A total of 2782 patients (1239 during the COVID-19 period) were included. A significantly higher incidence of complicated appendicitis (RR = 1.63, 95% CI 1.33-2.01, p < 0.00001) and a significantly higher proportion of children managed via the NOM (RR = 1.95, 95% CI 1.45-2.61, p < 0.00001) was observed in patients during the COVID-19 pandemic when compared to the pre-COVID-19 period.

CONCLUSION

There is a significantly higher incidence of complicated appendicitis in children during the COVID-19 pandemic than in the pre-COVID-19 period. Additionally, a significantly higher proportion of children was managed via the NOM during the pandemic in comparison to the pre-pandemic period.

Larger Physique as a Risk Factor for Infantile Appendicitis: A Retrospective Study

The clinical features and risk factors of acute appendicitis in infants are unclear. Our aim was to evaluate the association between anthropometrics and the occurrence of infantile appendicitis. This was a retrospective study of infants (<6 years of age) and school-age children (6-10 years of age) of Asian ethnicity who required hospitalization for appendicitis at our two participating institutions between 2004 and 2018. The Z-score for height, body weight, and body mass index (BMI) was compared between the two groups, as well as between patients presenting with perforated and non-perforated appendicitis. The analysis included data from 73 infants and 362 school-age children. Z-scores were greater in infants than in school-age children for height (0.37 versus -0.03, p = 0.003) and body weight (0.12 versus -0.36, p = 0.023), with no between-group difference for the Z-score of BMI. There was no difference in Z-scores for height, weight, and BMI between the perforated and non-perforated appendicitis infant groups. Infants presenting with acute appendicitis were characterized by a larger physique but with normal proportion. This trend was not observed in school-age children. Therefore, larger infants presenting with abdominal pain should be screened for appendicitis.

Preoperative Hyponatremia Indicates Complicated Acute Appendicitis

INTRODUCTION

Acute appendicitis is the most common surgical emergency. Early detection of patients with complicated appendicitis leads to prompt surgical management and better outcome. This study investigated the relationship between the severity of acute appendicitis and the presence of preoperative hyponatremia.

MATERIALS AND METHODS

We retrospectively reviewed the medical files of adult patients operated on for acute appendicitis over a 6-year period. Hyponatremia was defined as serum sodium level of ≤135 mEq/L. Patients were classified into complicated appendicitis and noncomplicated appendicitis according to operative findings and/or histopathology reports.

RESULTS

A total of 129 patients were identified and included in this study. Complicated appendicitis was found more frequently in female patients and older patients. Hyponatremia was found significantly more frequently in patients with complicated appendicitis (p < 0.001) and also in patients with perforation than without perforation (p=0.047).

CONCLUSIONS

The present study demonstrated that preoperative hyponatremia is associated with complicated appendicitis. Serum sodium levels, a routine, low-cost laboratory test, could act as an accessory marker aiding surgeons in earlier identification of gangrenous or perforated acute appendicitis.

RIPASA versus Alvarado score in the assessment of suspected appendicitis in children: a prospective study

Background

Diagnosis of acute appendicitis remains a problem in children with right lower quadrant pain.

Challenging diagnosis and fears of missing an inflamed appendix may lead to a negative appendectomy. Many scoring systems have been developed to reduce ambiguities in the diagnosis of appendicitis. Alvarado is one of the most commonly used scoring methods in pediatric patients. The RIPASA score is considered to be a better diagnostic scoring method in adults compared to Alvarado. The present study aims to compare RIPASA and Alvarado scoring systems in determining the possibility of acute appendicitis in children with right lower quadrant pain.

This study included 179 consecutive pediatric patients who were referred to pediatric surgery with suspicion of acute appendicitis. The cut-off value was >7.5 for the RIPASA score vs. ≥7 for the Alvarado score. The possibility of appendicitis was divided into three groups for the Alvarado score and four groups for the RIPASA score.

Results

In this study, 158 of 179 patients were operated on. In 140 of the operated patients, the diagnosis of appendicitis was confirmed by histopathology. The negative appendectomy rate was 11.4%. Specificity and negative predictive value of RIPASA score were higher than those of Alvarado (p<0.001). No difference was found between the two scores concerning sensitivity, positive predictive value, and the area under the receiver operator characteristics curve (p>0.05).

Conclusion

The RIPASA scoring system can be used as an alternative to the Alvarado scoring system in the management of patients with right lower quadrant pain in emergency services and pediatric outpatient clinics. With the use of the RIPASA score, more patients with a low likelihood of appendicitis can be detected and further contributed to the reduction of the negative appendectomy rate.

Hospitalization Trends for Acute Appendicitis in Spain, 1998 to 2017

The incidence of acute appendicitis decreased in Western countries from 1930 to at least the early 1990s, when epidemiological data started becoming scarcer. This study aimed to assess the trend in annual hospitalizations for acute appendicitis in all people Spain for a 20-year period between 1998 and 2017. This observational study analyzing direct age-standardized hospital admission rates by gender and age group (0–14 years, 15–34 years, 35–44 years, 45–64 years, and ≥65 years). Joinpoint regression models were fitted to evaluate changes in trends. There were 789,533 emergency hospital admissions for acute appendicitis between 1998 and 2017: 58.9% in boys and men and 41.1% in girls and women. Overall, there was a significant increase in admissions for this cause from 1998 to 2009, with an annual percent change (APC) of 0.6%. Following the peak in 2009, admission rates decreased by around 1.0% annually until 2017. The length of hospital stay gradually decreased from 4.5 days in 1998 to 3.4 days in 2017. The trends in hospital admissions for acute appendicitis in Spain changed over the study period, decreasing from 2009, especially in people younger than 35 years.

A new approach to laparoscopic appendectomy in children-clipless/sutureless Harmonic scalpel laparoscopic appendectomy

BACKGROUND

The aim of this study was to investigate Harmonic scalpel performance in laparoscopic appendectomy for sealing the base of the appendix in children.

METHODS

During the study period, a total of 312 patients who underwent laparoscopic appendectomy were included in prospective bicenter clinical trial. The patients were divided in two study groups in regard to technique used for appendiceal base closure. In the first group (n = 197) the appendiceal base was secured using a polymeric clip while in the second group (n = 115) the Harmonic scalpel was used for sealing the base in a stepwise manner, without placing any clip or suture. Outcomes of treatment, including complication rates, duration of surgery and length of hospital stay were compared between the groups.

RESULTS

A total of 312 patients with a median age of 11 years (IQR 8, 15) were included in study. Of these, 191 were males (61.2%). Both groups were symmetric in regard to baseline characteristics of the patients. A total of 10 (5.1%) postoperative complications (postoperative abscess n = 7 and ileus n = 3) were recorded in the polymeric clip group while none of the patients from the clipless group had postoperative complications (P = 0.015). In the group who received a polymeric clip appendectomy, fever lasting 0-72 h and > 72 h was recorded in 16 (8.1%) and 12 (6.1%) children, respectively, while in the clipless group, it was observed in 2 (1.7%) and 5 (4.3%) children, respectively (P = 0.048). Significantly shorter surgical times were found in the clipless group compared to the polymeric clip group (21 min (IQR 18, 25) vs. 30 min (IQR 22, 40), P < 0.0001). Also, length of hospital stay was significantly shorter in the clipless group of the patients (2 days (IQR 2, 3) vs. 3 days (IQR 2, 4), P < 0.0001).

CONCLUSION

Clipless harmonic scalpel laparoscopic appendectomy is a safe and effective method in children for treatment of acute appendicitis with lesser number of complications and shorter duration of surgery compared to laparoscopic appendectomy in which the appendiceal base is secured with clip.

Hyponatremia as a predictor of perforated acute appendicitis in pediatric population: A prospective study

BACKGROUND

The aim of this study was to investigate hyponatremia as a new biochemical marker associated with complicated appendicitis in the pediatric population.

METHODS

Pediatric patients (n = 184) with acute appendicitis confirmed by histopathology were enrolled in a prospective cohort study from January 2019 to May 2020. Medical history, demographic and clinical data were recorded in the study protocol. Blood samples for biochemical analysis, electrolytes and acute inflammatory markers were taken before surgery. Patients were further divided in two groups, those with non-perforated (n = 148; 79%) and perforated appendicitis (n = 38; 21%).

RESULTS

The mean serum sodium level in patients with complicated appendicitis was significantly lower compared to patients with non-complicated appendicitis (132.2 mmol/L vs. 139.2 mmol/L, p < 0.001). The receiver operating characteristic curve of plasma sodium concentration in patients who were diagnosed with perforated acute appendicitis showed an area under the curve of 0.983 (95% CI, 0.963-1.00). A cut-off-value of plasma sodium concentration of ≤135 mmol/L was shown to give the best possible sensitivity and specificity, 94.7% (95% CI: 82.2-99.3) and 88.5% (95% CI: 88.2-93.2) respectively (p < 0.001). Patients with complicated appendicitis were more likely to be younger than five years of age (10.5% vs. 1.4%, p = 0.005), have a duration of symptoms for >24 h (97.4% vs. 59.6%, p < 0.001), sodium serum concentration ≤135 mmol/L (89.5% vs. 5.5%, p < 0.001), body temperature >38.5 °C (47.4% vs. 11.0%, p < 0.001) and CRP serum concentration >62 mg/L (26% vs. 2%, p < 0.001).

CONCLUSION

Hyponatremia is a novel and very discriminative marker of complicated appendicitis in the pediatric population, and is therefore recommended in appendicitis diagnostic and treatment planning.

TYPE OF STUDY

Prospective comparative study LEVEL OF EVIDENCE: II.

Hyperbilirubinemia as an Indicator of Perforated Acute Appendicitis in Pediatric Population: A Prospective Study

Background: This prospective cohort study aimed to investigate the association of hyperbilirubinemia with perforated appendicitis in the pediatric population. Patients and Methods: A total of 284 children in whom the diagnosis of acute appendicitis was established were included in this study. The patients were allocated in study groups in regard to operative findings. The first study group included patients who had perforated appendicitis (n = 64; 22.5%) whereas the patients in the second group had simple appendicitis (n = 220; 77.5%). Blood samples for serum bilirubin levels and acute inflammatory markers were taken before the patients underwent surgery. The primary outcome of the study was to investigate whether the level of serum bilirubin should be used to distinguish between simple and perforated appendicitis. Results: The median level of serum bilirubin in children with perforated appendicitis was 27 mcmol/L whereas the patients with simple appendicitis had lower median levels of serum bilirubin (10 μmol/L; p < 0.001). An area under the receiver operating characteristic (ROC) curve for total serum bilirubin was 0.876 (95% confidence interval [CI], 0.820-0.929) in the patients who had a perforated appendicitis. An ROC analysis showed the best sensitivity (92%) and specificity (77.3%) for a cutoff value of 15.5 mcmol/L for total serum bilirubin (p < 0.001). Hyperbilirubinemia at admission was found in 35 patients (54.7%) with complicated appendicitis and in 14 patients (6.4%) with non-perforated appendicitis (p < 0.001). The modeling of collected data by multivariable logistic regression identified serum bilirubin concentration (odss ratio [OR] = 1.12; 95% CI, 1.07-1.18; p < 0.001), serum sodium concentration (OR = 0.64; 95% CI, 0.51-0.81; p < 0.001), body temperature (OR = 2.48; 95% CI, 1.05-0.84; p < 0.001), and duration of symptoms (OR = 1.06; 95% CI, 1.02-1.09; p < 0.001) as risk factors for perforated appendicitis. Conclusion: Elevateds level of total serum bilirubin may be useful as an indicator of perforated appendicitis in children. Levels of bilirubin in serum is an inexpensive, simple, and available laboratory marker and should therefore be recommended in the initial evaluation for acute appendicitis in pediatric patients.

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.

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.

Validity of Appendicitis Inflammatory Response Score in Distinguishing Perforated from Non-Perforated Appendicitis in Children

Background: This prospective observational study aimed to evaluate the validity of appendicitis inflammatory response (AIR) score in differentiating advanced (perforated) from simple (non-perforated) appendicitis in pediatric patients. Methods: A single-center prospective cross-sectional study was conducted between 1 January 2019 until 1 May 2020 including 184 pediatric patients who underwent appendectomy. Based on the intraoperative finding of advanced (n = 38) or simple (n = 146) appendicitis the patients were divided into two groups. Recipient-operator curve (ROC), with calculation of sensitivity and specificity of best cutoff and the area under the curve (AUC), were used to measure the diagnostic value and the potential for risk stratification of the AIR score, among the patients with simple or advanced acute appendicitis. Results: The median value of the AIR score in the perforated and non-perforated groups was 10 (interquartile range, IQR 9, 11), and was 7 (IQR 6, 9), respectively (p < 0.001). Based on the calculated value of AIR score, the patients were classified with a high precision into low, indeterminate and high risk groups for acute appendicitis (p < 0.001). A cutoff value of ≥9 was demonstrated to serve as a reliable indicator of perforated appendicitis with a sensitivity and a specificity of 89.5% and 71.9%, respectively (AUC = 0.80; 95% CI: 0.719–0.871; p < 0.001). Conclusions: Acute appendicitis can be detected with a high level of sensitivity and specificity using the AIR score. Also, the AIR score may differentiate perforated from non-perforated appendicitis in pediatric patients with a high level of accuracy.

Predictive Value of Alvarado Score and Pediatric Appendicitis Score in the Success of Nonoperative Management for Simple Acute Appendicitis in Children

INTRODUCTION

 During the past decade, nonoperative management (NOM) for simple acute appendicitis (SAA) in children has been proven safe with noninferior complications rate. The aim of this study was to examine Alvarado score and pediatric appendicitis score (PAS) together with other factors in predicting failure of NOM in children presenting with SAA.

MATERIALS AND METHODS

 Patients aged 5 to 18 years admitted to our department between 2017 and 2019 diagnosed with SAA were given a choice between surgical management and NOM. We divided the NOM patients into two groups: successful treatment and failed NOM, comparing their files for Alvarado score and PAS and other clinical and demographic factors, with a mean follow-up of 7 months. Failure was determined as need for appendectomy following conservative treatment due to any reason.

RESULTS

 A total of 85 patients answered criteria and chose NOM. Overall failure rate was 32.9%. We found no difference in the mean Alvarado score and PAS as well as in each component of both scores between success and failed NOM groups. However, when using the risk classification of the scores, we found a significant correlation between high-risk Alvarado score and failed NOM. After adjusting for age, gender, duration of symptoms, diagnosis of tip appendicitis, and presence of appendicolith, the odds of failure were four times higher among high-risk Alvarado group.

CONCLUSION

 Alvarado score of 7 or higher, older age, and diagnosis of an appendicolith on imaging are possible predictors for failure of NOM for SAA in children.

Quality Outcomes in Appendicitis Care: Identifying Opportunities to Improve Care

INTRODUCTION

Appendicitis is one of the most common causes of acute abdominal pain requiring surgical intervention, but the variability of diagnosis and management continue to challenge the surgeons. Aim: This study assessed patients undergoing appendectomy to identify opportunities to improve diagnostic accuracy and outcomes.

METHODS

An ethically approved retrospective cohort study was undertaken between March 2016 and March 2017 at a single university hospital of all consecutive adult and paediatric patients undergoing appendectomy. Demographic data including age, gender, co-morbidities, presentation and triage timings along with investigation, imaging and operative data were analysed. Appendicitis was defined as acute based on histology coupled with intraoperative grading with the American Association for the Surgery of Trauma (AAST) grades. Complications using the Clavien-Dindo classification along with 30-day re-admission rates and the negative appendectomy rates (NAR) were recorded and categorised greater and less than 25%. The use of scoring systems was assessed, and retrospective scoring performed to compare the Alvarado, Adult Appendicitis Score (AAS) and the Appendicitis Inflammatory Response (AIR) score. Results: A total of 201 patients were studied, 115 male and 86 females, of which 136/201 (67.6%) were adults and 65/201 (32.3%) paediatric. Of the adult group, 83 were male and 53 were female, and of the paediatric group, 32 were male and 33 were female. Median age was 20 years (range: 5 years to 81 years) and no patient below the age of 5 years had an appendectomy during our study period. All patients were admitted via the emergency department and median time from triage to surgical review was 2 h and 38 min, (range: 10 min to 26 h and 10 min). Median time from emergency department review to surgical review, 55 min (range: 5 min to 6 h and 43 min). Median time to operating theatre was 21 h from admission (range: 45 min to 140 h and 30 min). Out of the total patients, 173 (86.1%) underwent laparoscopic approach, 28 (13.9%) had an open approach and 12 (6.9%) of the 173 were converted to open. Acute appendicitis occurred in 166/201 (82.6%). There was no significant association between grade of appendicitis and surgeons' categorical NAR rate (p = 0.07). Imaging was performed in 118/201 (58.7%); abdominal ultrasound (US) in 53 (26.4%), abdominal computed tomography (CT) in 59 (29.2%) and both US and CT in 6 (3%). The best cut-off point was 4 (sensitivity 84.3% and specificity of 65.7%) for AIR score, 9 (sensitivity of 74.7% and specificity of 68.6%) for AAS, and 7 (sensitivity of 77.7% and specificity of 71.4%) for the Alvarado score. Twenty-four (11.9%) were re-admitted, due to pain in 16 (58.3%), collections in 3 (25%), 1 (4.2%) wound abscess, 1 (4.2%) stump appendicitis, 1 (4.2%) small bowel obstruction and 1 (4.2%) fresh rectal bleeding. CT guided drainage was performed in 2 (8.3%). One patient had release of wound collection under general anaesthetic whereas another patient had laparoscopic drain placement. A laparotomy was undertaken in 3 (12.5%) patients with division of adhesions in 1, the appendicular stump removed in 1 and 1 had multiple collections drained.

CONCLUSION

The negative appendectomy and re-admission rates were unacceptably high and need to be reduced. Minimising surgical variance with use of scoring systems and introduction of pathways may be a strategy to reduce NAR. New systems of feedback need to be introduced to improve outcomes.

A clinical prediction model for complicated appendicitis in children younger than five years of age

Background

No reliably specific method for complicated appendicitis has been identified in children younger than five years of age. This study aimed to analyze the independent factors for complicated appendicitis in children younger than five years of age, develop and validate a prediction model for the differentiation of simple and complicated appendicitis.

Methods

A retrospective study of 382 children younger than five years of age with acute appendicitis from January 2007 to December 2016 was conducted with assessments of demographic data, clinical symptoms and signs, and pre-operative laboratory results. According to intraoperative findings and postoperative pathological results, acute appendicitis was divided into simple and complicated appendicitis. Univariate and multivariate analyses were used to screen out the independent factors of complicated appendicitis, and develop a prediction model for complicated appendicitis. Then 156 such patients from January 2017 to December 2019 were collected as validation sample to validate the prediction model. Test performance of the prediction model was compared with the ALVARADO score and Pediatric Appendicitis Score (PAS).

Results

Of the 382 patients, 244 (63.9%) had complicated appendicitis. Age, white blood cell count, and duration of symptoms were the independent factors for complicated appendicitis in children younger than five years of age. The final predication model for complicated appendicitis included factors above. In validation sample, the prediction model exhibited a high degree of discrimination (area under the curve [AUC]: 0.830; 95% confidence interval [CI]: 0.762–0.885) corresponding to a optimal cutoff value of 0.62, and outperformed the PAS (AUC: 0.735; 95% CI: 0.658–0.802), ALVARADO score (AUC: 0.733; 95% CI: 0.657–0.801).

Conclusion

Age, white blood cell count, and duration of symptoms could be used to predict complicated appendicitis in children younger than five years of age with acute appendicitis. The prediction model is a novel but promising method that aids in the differentiation of acute simple and complicated appendicitis.

Influence of age on clinical presentation, diagnosis delay and outcome in pre-school children with acute appendicitis

Background

Unusual clinical presentation of acute appendicitis in preschool children leads to misdiagnosis and complications.

We aimed to analyze the influence of age on clinical presentation, laboratory findings and complications in preschool children with acute appendicitis.

Methods

From January 2012 until December 2017, 29 children younger than 6 years of age (median 50 months) with acute appendicitis were enrolled in this retrospective study. Patients were grouped according to their age: group 1: < 48 months (n = 13); group 2: > 48 months (n = 16), their clinical data, laboratory results and complications were compared.

Results

In group 1, duration of nausea and vomiting was longer, alteration of general state was more frequent and pain in the right fossa iliaca less frequent than in group 2 (p = 0.026, p = 0.000 and p = 0.029, respectively). Heart rate was higher in group 1 than in group 2 (p = 0.012). Leucocyte and polynuclear neutrophil counts were lower in group 1 than in group 2 (p = 0.028 and = 0.004, respectively) but C-reactive protein levels were not different between groups. In the whole cohort however, C-reactive protein at admission value correlated negatively with age (p = 0.025).

Abdominal ultrasound allowed diagnosis in 19/29 patients (65.5%), without any difference between groups. Appendicular perforation was more frequent in group 1 than in group 2 (p = 0.003). Perforation was also related to longer hospital stay (p = 0.018). Peritonitis occurred in 21/29 (72%), post-operative ileus in 5/29 (17%) and sepsis in 4/29 (14%) patients without any difference between groups. In the whole cohort, hospital stay correlated negatively with age (p = 0.000). There was no mortality.

Conclusions

Among preschool children, those younger than 48 months present with longer duration of pre-admission symptoms indicating longer infection course than in older children. Altered general state and higher degree of tachycardia in the younger reflect higher systemic repercussions of the illness. Less specific abdominal pain and dissociation of the inflammatory markers with lower leucocyte- and neutrophil counts and higher C-reactive protein levels in the younger may contribute to further diagnosis delay and higher rate of perforation in these patients.