Acute pancreatitis is one of the common acute abdomen in surgery. Gallbladder stones are the main pathogenic factor. Gallstone pancreatitis accounts for more than 50% of all pancreatitis cases and shows an increasing trend at present.
Currently, laparoscopic cholecystectomy is the preferred method for treating acute gallstone pancreatitis and reducing its recurrence. For patients with acute severe pancreatitis, since there is a higher risk of complications with early surgical intervention, surgery is often performed after the inflammation has subsided. For patients with MAGP, current international guidelines support the use of “early” laparoscopic cholecystectomy. However, there is a lack of consensus regarding the definition of “early” in each guide. Diversification of early definitions may lead to bias in conclusions. The International Association of Pancreatology recommends cholecystectomy during the same admission. While the American Gastroenterological Association suggests that LC should be performed within the period of hospital admission and not beyond 2 to 4 weeks after discharge. In addition, some guidelines fail to advice on the timing of cholecystectomy for acute biliary pancreatitis.
The timing of surgery is focused on the safety and effectiveness of surgery. It is generally believed that acute mild pancreatitis should be treated with conservative symptomatic support treatment for 2 to 4 weeks or even longer before undergoing a cholecystectomy. Delaying surgery provides time for a detailed examination, finding the cause, avoiding unnecessary biliary exploration, avoiding early surgery that might aggravate the pancreatitis, and is conducive to recovery from acute pancreatitis. Since the adhesion from abdominal inflammation is relieved, surgical risk is reduced and operative complications and the rate of conversion to laparotomy are decreased. However, many studies show that conservative treatments only relieve symptoms and not the underlying cause of pancreatitis. Some patients with delayed surgery have recurrence during the wait for surgery, which aggravates the economic burden of patients.[8–9] In addition, studies have shown that early surgery does not increase patient complications or hospital stay, and the perioperative period is safe.
Therefore, we conducted this updated meta-analysis to compare the safety and efficacy between early laparoscopic cholecystectomy (ELC) and delayed laparoscopic cholecystectomy (DLC) in patients with mild gallstone pancreatitis to guide clinical decision-making.
2.1 Data sources and search strategy
A comprehensive search of MEDLINE, EMBASE, PubMed, Cochrane, and the ISI Web of Science databases from inception to March 2019 was performed by 2 investigators. “cholecystectomy” and “pancreatitis” MeSH terms were used and combined with free-text words. In addition, the references of eligible studies, pertinent reviews, and meta-analyses in this field were screened.
2.2 Inclusion and exclusion criteria
In this study, we defined ELC as same admission or laparoscopic cholecystectomy performed within 2 weeks after admission. The control group was defined as DLC. Mild pancreatitis was defined by the presence of Ranson score < 3 or according to Atlanta classification.
The inclusion criteria were as follows:
- 1. patients with mild gallstone pancreatitis according to a clear MAGP severity scoring system;
- 2. trials comparing the clinical indicators between ELC and DLC;
- 3. studies that provided adequate and extracted clinical outcome data;
- 4. original high-quality English articles.
The exclusion criteria were:
- 1. conference abstracts, expert opinion, review articles, case reports, editorials, and letters to the editor;
- 2. articles that included patients with severe and/or other origins of pancreatitis; and
- 3. articles that lack clinical outcome data and unable to get full text.
2.3 Data extraction
The following information was captured using data abstraction forms: first author, year, country and journal of publication, number of patients, study design, criteria of MAGP, definition of ELC and DLC, clinical outcomes including the rate of conversion to open cholecystectomy (COC), rate of complications, rate of gallstone-related events, rate of readmission, rate of endoscopic retrograde cholangiopancreatography (ERCP) usage, operative time (OT), and length of stay (LOS). To reduce inaccuracy in the extracted outcome indicator, this work was performed by 2 independent investigators.
2.4 Quality assessment
A total of 19 studies were included. The quality evaluation of the literature was assessed using the Newcastle–Ottawa Scale. The scoring criteria are based on the following 3 sections: the selection of the study groups; the comparability of the groups; and the ascertainment of either the exposure or outcome. The highest score is 9 points. The higher scores reflect a better methodological quality. This work was performed independently by 2 investigators. Disagreements were resolved through discussion or third party ruling.
2.5 Statistical analyses
Meta-analysis was performed using Review Manager5.3 software (Cochrane Collaboration, Copenhagen, Denmark). The risk ratio (RR) and the mean difference (MD) was used for the count data and the measurement data, respectively and the 95% confidence interval (CI) represented the combined statistics. Statistical heterogeneity between trials was evaluated by the Chi-Squared test. When there was no statistically significant heterogeneity (P > .05, I2 < 50%), the fixed-effect model was applied for the meta-analysis, otherwise, the random-effect model was selected. The risk ratio (RR) and 95% CI were used to evaluate clinical efficacy. The consolidated result was an average RR and 95% CI weighted according to the standard error of the RR of the trial. P < .05 was considered a statistically significant difference. Funnel plots were used to assess the publication bias.
2.6 Ethics declarations
Ethics approval and consent to participate are not applicable for meta-analysis.
3.1 Study characteristics
The PRISMA flow diagram of the study selection process is shown in Figure 1. A total of 3297 articles were identified after a comprehensive search of the database. 1445 articles were left after duplicate removal. Upon further reading of the title and abstract, eventually 42 articles tentatively qualified. Three studies that were conference abstracts were excluded. Of the remaining 39 articles, 4 did not specify the MAGP criteria, 3 involved severe pancreatitis, 9 studies showed that the surgical procedure was not only LC, and 4 lacked clinical outcomes to extract data and were all therefore excluded. Ultimately, 19 eligible studies, 5 randomized controlled trials [RCTs],[10,12–15] and 14 retrospective studies[16–29] comprising a total of 2639 patients, were considered eligible for the meta-analysis. Characteristics of included studies and literature quality scores are summarized in Table 1.
Data regarding complications were provided in 19 studies, comprising 2639 patients. There was no significant difference in intraoperative complications (RR = 1.46; 95% CI = 0.88–2.41; P = .14; Fig. 2) and postoperative complications (RR = 0.81; 95% CI = 0.58–1.14; P = .23; Fig. 3) between the ELC and DLC groups. According to the different criteria of MAGP and study design for postoperative complications, the subgroup analysis also showed no significant differences in the 2 subgroups (Table 2)
3.2.2 Conversion to open cholecystectomy
Nineteen studies evaluated the association between ELC and DLC groups in terms of the rate of conversion to open cholecystectomy. There was no significant difference between the 2 groups (RR = 1.00; 95% CI = 0.75–1.33; P = .99; Fig. 4). The subgroup analysis showed no significant differences in the 2 subgroups (Table 2).
3.2.3 Hospital length of stay
Twelve studies comprising 1867 patients evaluated the association on hospital length of stay between ELC and DLC. In comparison with the DLC group, the ELC group was significantly correlated with lower length of stay (MD = −2.01; 95% CI = −3.15 to −0.87; P = .0006; Fig. 5).
3.2.4 Operative time
Nine studies involving 1431 patients evaluated the association on operative time between the ELC and DLC groups. There was no significant difference between the 2 groups (MD = 1.60; 95% CI = −1.36 to 4.56; P = .29; Fig. 6).
3.2.5 Gallstone-related events
Ten studies involving 1646 patients evaluated the association on gallstone-related events between ELC and DLC. There was significant difference between the 2 groups (RR = 0.17; 95% CI = 0.07–0.44; P = .0003; Fig. 7).
Nine studies comprising 1726 patients analyzed the rate of readmission between the ELC and the DLC group. There was no significant difference between the 2 groups (RR = 0.63; 95% CI = 0.19–2.10; P = .45; Fig. 8).
3.2.7 ERCP usage rate
Seventeen studies comprising 2433 patients evaluated the ERCP usage rate between the 2 groups. In comparison with the DLC group, the rate of ERCP usage during perioperative period was significantly lower in the ELC group (RR = 0.83; 95% CI = 0.71–0.97; P = .02; Fig. 9).
Different surgical timings have an impact on the surgical procedure, related complications, and prognosis of patients with MAGP. Laparoscopic cholecystectomy is a decisive treatment for patients with MAGP; however, no consensus has yet been reached for an optimal timing. Our results of this meta-analysis show that for patients with mild acute gallstone pancreatitis, early laparoscopic cholecystectomy is safe and effective and can shorten hospital stays, decrease the incidence of gallstone-related events, and reduce the overall usage of ERCP during the course of the disease without increasing postoperative complications, conversion to open cholecystectomy, re-admission, and operation time.
Oddi sphincter edema and spasm caused by incarceration or stone discharge of gallstones results in bile and pancreatic juice excretion, which leads to ectopic activation of pancreatic enzymes and self-digestion that causes inflammation of the pancreas, which in turn causes systemic inflammatory lesions. For clinically experienced surgeons, the difficulty of surgery is similar, irrespective of the timing. This is due to the following reasons.
- 1. Anatomical variation: Surgical difficulty or intraoperative conversion to open surgery will be affected by anatomical variation, which is an independent factor and is not related to the timing of surgery. Therefore, ERCP before surgery is necessary because it can visually display the internal lesions and anatomical structures of the pancreaticobiliary system. It can determine the preoperative biliary calculi and can also clarify the anatomical relationship of the cystic duct, common hepatic duct, hepatic duct, and common bile duct, which helps the physician to identify the biliary anatomy of the patient and reduce the intraoperative injury rate.
- 2. Degree of abdominal adhesion: The main criterion for the adhesion around the gallbladder is the thickness of the gallbladder wall, which is the main reason for the high rate of intraoperative laparotomy.
Research has shown that when the wall thickness of the gallbladder is <0.5 cm and there is no stone incarceration, the gallbladder has no adhesion or only membranous adhesion to the surrounding tissue, this does not increase the difficulty of surgery and the chance of conversion to open laparotomy. When the wall thickness of the gallbladder is ≥0.5 cm, the inflammation is greater. In the case of acute inflammation the Calot triangle is congestion, edema, and surgical separation is easier at this time; in subacute or chronic inflammation cases, the Calot triangle fiber connective tissue is significantly thickened, due to which the Calot triangle is often unclear and difficult to separate, leading to an increased chance of conversion to open surgery and postoperative complications. Clinical practice has shown that in the early stage of acute inflammation, especially within 72 hours, the gallbladder triangle is often edematous and hyperemic, with no obvious fibrosis. ELC did not increase the difficulty of surgery. On the contrary, with readmission surgery, dissection is sometimes more difficult.[16,21]
Conservative treatment of internal medicine is only symptomatic treatment and does not eradicate the cause of pancreatitis, so there is a risk of recurrence while waiting for surgery. Studies have shown that 20.0% to 60.0% of patients suffered gallstone related events such as recurrence of cholecystitis, pancreatitis, and biliary colic during the waiting phase. Repeated invisible disease increases patient LOS and chance of ERCP.
We understand that under acute conditions, surgery within 72 hours of onset is less difficult, and the separation still has obvious anatomical boundaries. With the progression of time, operational difficulty may increase. However, careful dissection, patience, and critical recognition of the anatomy can result in safe completion of most LC procedures. Moreover, we defined the node with 72 hours as an early group and conducted a meta-analysis of the included literature. The results showed that the early surgery group did not experience increased postoperative complications[12,14–16,18,20–23,25,27–28] (RR = 0.86; 95% CI = 0.56–1.32; P = .49) and conversion to open surgery[12,14–16,18,20–23,25,27] (RR = 0.84; 95% CI = 0.37–1.91; P = .68) compared with delayed surgery.
This meta-analysis has several limitations. First, in the included literature, Ranson scores were mostly used, and Yeung et al reported that the APACHE-II score was more predictive of the degree of inflammation in pancreatitis compared to the Ranson score within 48 hours. Second, most of the literature contains non-randomized controlled trials. Results from more randomized controlled trials are required to support this study. Additionally, only published English articles were included. Therefore, the summary statistics obtained may not approximate the true average.
In summary, for patients with mild acute gallstone pancreatitis, early laparoscopic cholecystectomy is safe and effective during the first admission, but the indications and contraindications must be strictly controlled. These results need to be further confirmed by higher quality randomized controlled studies.
The authors sincerely thank the reviewers for their valuable comments on this paper.
Data curation: Fu-ping Zhong, kai Wang, Xue-qin Tan, Jian Nie.
Formal analysis: Kai Wang.
Methodology: Fu-ping Zhong, Kai Wang, Xue-qin Tan, Wen-feng Huang, Xiao-fang Wang.
Writing – review & editing: Fu-ping Zhong.
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