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Methods for prevention of acute post-endoscopic retrograde cholangiopancreatography pancreatitis

Kamil Jaszczuk
1
,
Michał Lipiński
1
,
Grażyna Rydzewska
2

1.
Department of Internal Medicine and Gastroenterology with IBD Subdivision, Central Clinical Hospital of the Ministry of the Interior, Warsaw, Poland
2.
Faculty of Medicine and Health Sciences, Jan Kochanowski University, Kielce, Poland
Data publikacji online: 2020/06/08
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Introduction

Acute pancreatitis (AP) is the most common complication of endoscopic retrograde cholangiopancreatography (ERCP), with incidence rates ranging between 2% and 16% [1]. Post-ECRP pancreatitis (PEP) may occasionally lead to death and is a cause of higher hospitalisation costs. Analyses show that severe disease may develop in 5% of PEP patients. When only high-risk patients are taken into account, this percentage rises to 25% [2].
The 1992 Atlanta classification defined the terminology and grading of acute pancreatitis. In 2012, a revision was made to the Atlanta classification with regard to definition of acute pancreatitis and its types (Table I) [3]. Acute pancreatitis is defined on the basis of symptoms and results of laboratory investigations and imaging scans. Diagnosis requires any two of the following three criteria being met: epigastric pain, a three-fold increase in amylase or lipase, and typical features of AP in imaging scans (abdominal ultrasound, CT, or MRI scans). Post-ECRP pancreatitis was defined as a consensus statement and described in 1991 by Cotton et al. Definition includes: the presence of typical abdominal pain, a three-fold increase in pancreatic enzyme activity levels as compared to the upper limit of normal within 24 h from the procedure, and a necessity to continue hospitalisation for at least two days. According to the consensus, the severity of PEP is defined on the basis of the duration of hospital stay: mild when hospitalisation lasts < 3 days, moderate when hospitalisation lasts 4–10 days, and severe when hospitalisation lasts > 10 days [4]. It is very important that the physicians are aware of the patient- and procedure-related risk factors of PEP (Table II) [5].
Appropriate qualification of patients for the ERCP procedures plays an important role in the reduction of PEP-related hospitalisations [6]. Currently available techniques, including endoscopic ultrasound (EUS) or magnetic resonance, facilitate accurate evaluation of intra- and extrahepatic bile ducts, pancreas, or gallbladder. An increasing number of publications confirm the finding that EUS is more accurate and less expensive as a diagnostic method for proper qualification of patients for ERCP procedures [7, 8].
On the other hand, it is worthwhile presenting the conclusions from a study aimed at assessing the effect of patient age on the risk and natural history of PEP. A total of 2688 patients undergoing their first ERCP procedure were qualified for the study and were divided into two groups: patients below 75 years of age (group 1) and patients above 75 years of age (group 2). The incidence of PEP was 5.2% in group 1 and 4% in group 2 (p = NS); no significant differences were observed between the two groups of patients in terms of disease severity. PEP episodes were treated in a standard fashion and were free of other complications. It was therefore concluded that the ageing of society has no effect on the prevalence and intensity of PEP [9]. It is also worth mentioning that the incidence of ERCP-related adverse events in patients diagnosed with autoimmune pancreatitis type 1 (AIP 1) was low [10].

Endoscopic methods

Recent years have witnessed the appearance of publications and scientific evidence confirming the benefits of prophylactic stenting of the pancreatic tract during the ERCP procedure. Stent placement was found to reduce the pressure within the pancreatic duct following biliary sphincterectomy (SE) and to lower the incidence of PEP [11]. Another clinical trial examined the impact of stent size on the prevention of PEP. The 3 Fr stents were shown to be associated with lower rates of PEP and pancreatic duct disruption, compared to 5 Fr stents [12]. On the other hand, a study published in 2017 suggested no additional benefit of stenting as compared to the use of intrarectal NSAID suppositories in the prevention of PEP in high-risk patients [13].

Pharmacological methods

Nonsteroidal anti-inflammatory drugs (NSAIDs)

Nonsteroidal anti-inflammatory drugs are strong inhibitors of phospholipase A2, a key modulator within the cascade responsible for clinical symptoms of PEP. A study carried out to assess the efficacy of intrarectal diclofenac, published in 2003, showed that the drug could reduce the incidence of PEP if administered immediately following the ERCP procedure [14]. Numerous other studies warranting the use of NSAIDs before or immediately after ERCP were published in the following years. In 2017, one study was published with a conclusion suggesting that diclofenac had no beneficial effect on the risk of PEP [15]. However, the same year witnessed the publication of two meta-analyses from China, in which the safety and efficacy of intrarectal diclofenac were demonstrated [16, 17].
In 2018, a large meta-analysis of data spanning from 1990 to 2017 was published. The authors concluded that both indomethacin and diclofenac, when administered via the intrarectal route, effectively prevented PEP in high- and moderate-risk patients [18].

Nitrates

The hypothetical mechanism of action of these drugs in the prevention of PEP consists of tone reduction of the sphincter of Oddi. However, drugs from this group found no wider use in the prevention of post- ERCP pancreatitis [19]. Another study suggested that combination of indomethacin and sublingual nitrates administered prior to ERCP reduced the risk of PEP more efficiently than NSAIDs. However, no further results have been published on the topic over the subsequent 4 years.

Aggressive intravenous fluid resuscitation

An increasing body of evidence suggests that aggressive intravenous fluid resuscitation (IVFR) may reduce the incidence of pancreatitis. 2017 and 2018 witnessed publication of studies in which Ringer’s lactate solution (RLS), when administered immediately after ERCP in a bolus of 20 ml/kg followed by infusion of 2 ml/kg/h for 8 h, was more efficient than intrarectal indomethacin and showed better preventive effects compared to a standard supply of crystalloids in the prevention of PEP in moderate- to high-risk patients [20–22].

Somatostatin and octreotide

Somatostatin, a strong inhibitor of pancreatic exocrine function, was found to prevent or alleviate pancreatitis and affect the function of the sphincter of Oddi. A study published in 2016 revealed that high-dose somatostatin administered over 12 hours could significantly reduce the frequency of post-ERCP pancreatitis (11.3% vs. 4.9%). At the same time, low doses of somatostatin or bolus administration were ineffective in reducing the incidence of PEP (8.5% as compared to 6.4%, OR = 1.37, 95% CI: 0.89–2.12, p = 0.150, 4.9% as compared to 9.3%, OR = 0.39, 95% CI: 0.14–1.04, p = 0.060) [23]. In 2018, a meta-analysis was conducted on all studies available within the PubMed, EMBASE, Cochrane, and Science citation index databases, to show that prophylactic long-term injections of somatostatin could significantly reduce the frequency of abdominal pain and hyperamylasaemia in high-risk patients after ERCP. The method is not recommended in patients at low risk of PEP [24].

Antibiotic therapy

As demonstrated by a retrospective study by Ishigaki et al., antibiotics do not reduce the risk of PEP or the incidence of post-ERCP pancreatitis [25].

Cannabis indica

A study published in 2018 demonstrated that the intake of cannabis derivatives was associated with a significant rise in PEP morbidity but not mortality rates [26].

Prediction of PEP

In June 2018, an interesting article was published regarding the usefulness of serum amylase and lipase determinations performed 2 and 4 h after ERCP. The measurements were shown that they can be useful in PEP forecasting [27]. Another study examined the serum levels of phosphates over the period of 12–24 h after ERCP; phosphate concentration was shown to be associated with the severity of PEP [28], but the topic requires further research on the potential use of serum phosphate levels as prognostic markers.
An interesting concept consists of the use of blood pressure cuffs to induce temporary ischaemia within the upper limb as a means to prevent PEP prior to the ERCP procedure – studies on the subject are underway at the Department of Internal Medicine and Gastroenterology with IBD Subdivision, Central Clinical Hospital of the Ministry of the Interior in Warsaw, Poland. Currently, the method is used mainly in cardiosurgery, e.g. as a means to reduce the incidence of acute renal damage. Despite the wide applicability of the induced ischaemia method, no studies assessing the efficacy of pancreatic protection following retrograde cholangiopancreatography are available in the literature. The study will aim at the assessment of the method’s efficacy in reducing the incidence of acute pancreatitis following endoscopic retrograde cholangiopancreatography. Results are planned to be published in late 2019/early 2020.

Conclusions

Because PEP remains the most common complication of ERCP, measures are continuously being taken to reduce the incidence and severity of PEP episodes. These parameters may be reduced, e.g. by appropriate qualification of patients for ERCP procedures using appropriate diagnostic examinations and supported by appropriate endoscopist’s experience. Table III lists the clinically tested substances, chemicals, and stents that may or may not be efficient in PEP prevention [29–35]. Ultimately, the guidelines of the American Society of Gastrointestinal Endoscopy (ASGE) and the European Society of Gastrointestinal Endoscopy (ESGE) recommend that intrarectal NSAIDs are used for prevention of PEP due to their low cost, simple administration, and good safety profile. In addition, the ASGE and ESGE suggest that pancreatic duct stenting and intravenous hydration using Ringer lactate solution may be considered as means of PEP prevention [36–39].
Due to the concerns associated with the ambiguous results of studies on the use of NSAIDs [15] in the prevention of PEP, further search for an optimum method to reduce the risk of these dangerous complications is warranted.

Conflict of interest

The authors declare no conflict of interest.

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