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Myriam Delhaye is an Associate<br />

Clinical Director in the<br />

Medicosurgical Department of<br />

<strong>Gastroenterology</strong> (headed by<br />

Professor Jacques Devière) at the<br />

Erasme University Hospital.<br />

Together with the team directed by<br />

Professor Michel Cremer, she was<br />

involved in the controversy<br />

surrounding the clinical significance<br />

of pancreas divisum and she<br />

pioneered the use of extracorporeal<br />

shock wave lithotripsy of bile duct<br />

and pancreatic stones in 1987.<br />

Dr Delhaye’s main research interests<br />

are inflammatory pancreatic<br />

diseases, pancreatic cystic neoplasms<br />

and endoscopic therapeutic<br />

procedures for biliopancreatic<br />

diseases. She completed a five-year<br />

academic residency in internal<br />

medicine with a two-year fellowship<br />

in gastroenterology at Erasme<br />

University Hospital. She obtained<br />

her MD from the Free University of<br />

Brussels in 1979.<br />

1<br />

a report by<br />

Myriam Delhaye<br />

Associate Clinical Director, Medicosurgical Department of <strong>Gastroenterology</strong>, Erasme University Hospital<br />

<strong>Acute</strong> relapsing pancreatitis (ARP) represents a<br />

challenging clinical problem in the field of<br />

hepatobiliary and pancreatic disorders. It is associated<br />

with significant morbidity, impairment in quality of<br />

life and a negative impact on medical costs. <strong>Acute</strong><br />

pancreatitis is a common condition with a reported<br />

yearly incidence ranging between 300 and 500<br />

patients per million per year in the Western world. 1<br />

Without an adequate initial work-up and directed<br />

therapy, more than half of the patients with an initial<br />

attack of acute pancreatitis may suffer recurrent<br />

attacks or develop chronic pancreatitis. 2<br />

Definitions<br />

<strong>Acute</strong> pancreatitis is defined as typical pancreatic<br />

abdominal pain (mid-epigastric with radiation to the<br />

back) persisting for several hours, associated with<br />

elevation of serum amylase or lipase (to more than<br />

three times the normal levels).<br />

ARP is defined as two or more well-documented<br />

separate episodes of pancreatitis (pain and abnormal<br />

laboratory studies) that resolve between attacks. 3<br />

Evidence of pancreatitis should be documented by<br />

computed tomography (CT) or magnetic resonance<br />

imaging (MRI) during at least one episode.<br />

<strong>Acute</strong> idiopathic pancreatitis is a term used when no<br />

underlying cause has been identified.<br />

Causes of ARP<br />

Reference Section<br />

<strong>Acute</strong> <strong>Relapsing</strong> <strong>Pancreatitis</strong><br />

An aetiology can be found in 70% to 80% of patients<br />

after an attack of acute pancreatitis, with alcohol<br />

abuse and gallstone disease most often implicated. 4<br />

Causes of ARP can be classified as follows.<br />

Toxic/Metabolic Causes<br />

Alcohol-induced pancreatitis is easily identified based<br />

on clinical history.<br />

Hypercalcaemia (due to hyperparathyroidism in<br />

more than 90% of cases) and hypertriglyceridaemia<br />

(>1,000mg/dl is usually necessary) are established but<br />

rare causes of ARP. 5<br />

Many medications have been implicated as causes of<br />

acute pancreatitis with a dose-dependent or<br />

idiosyncratic mechanism for the majority of cases, 4<br />

but are most often associated with a single episode of<br />

acute pancreatitis rather than ARP.<br />

Mechanical Causes<br />

Mechanical causes can induce a persistent or transient<br />

obstruction of pancreatic juice flow into the<br />

duodenum, with a consequent rise in intraductal<br />

pancreatic pressure. Potential causes of impaired<br />

pancreatic drainage include:<br />

• migration of biliary stones, microlithiasis (


Biliary or pancreatic SOD are divided into the<br />

following three types: 8,10,11<br />

• Type 1 corresponds to patients with biliary- or<br />

pancreatic-type pain, elevation of liver function<br />

tests or pancreatic hydrolases, and dilation of the<br />

common bile duct (>12mm in diameter) or the<br />

main pancreatic duct (>5mm in diameter). Type 1<br />

is considered to be due to a chronic inflammatory<br />

process (probably secondary to passage of biliary<br />

lithiasis or microlithiasis through the sphincter),<br />

which becomes a fibrosis with subsequent stenosis<br />

of part of or the entire sphincter.<br />

• Type 2 is considered for patients with biliary- or<br />

pancreatic-type pain and only one other criterion<br />

(abnormal laboratory tests or ductal dilation). These<br />

patients are thought to suffer from a functional<br />

alteration of the physiological motility of the<br />

sphincter that causes some delay in the passage of<br />

biliary or pancreatic juices into the duodenum.<br />

• Type 3 is reported for patients with only typical<br />

clinical symptoms.<br />

Pancreas divisum (PD) is the most common<br />

congenital variant of the human pancreas occurring<br />

in 5% to 10% of Caucasian individuals. 12,13 Less than<br />

5% of the population with PD ever develop<br />

pancreatic symptoms; subsequently, PD seems to<br />

have little clinical relevance. 2<br />

Although controversial, it is postulated that a relative<br />

outflow obstruction at the site of the minor papilla<br />

overburdened by draining of the larger dorsal<br />

pancreas may be the mechanism of pancreatitis in<br />

some patients with PD and unexplained ARP. 4,14<br />

However, the frequency of PD is similar in control<br />

patients, patients with chronic pancreatitis and<br />

patients with idiopathic pancreatitis. 12,15<br />

Recruitment bias (greater frequency of PD diagnosis in<br />

patients referred after unsuccessful opacification of the<br />

pancreatic ductal system) may have resulted in an<br />

overestimation of the prevalence of PD in endoscopic<br />

retrograde cholangio-pancreatography (ERCP) studies<br />

investigating suspected idiopathic ARP. 16 It has been<br />

shown that a persistent dilation of the main pancreatic<br />

duct greater than 3mm at 10 minutes after secretin<br />

injection assessed during secretin-enhanced magnetic<br />

resonance cholangio-pancreatography (S-MRCP) is<br />

correlated with a clinical diagnosis of papillary<br />

stenosis. 15,17 However, the frequency of such a<br />

response to secretin suggesting a functional or organic<br />

stenosis of the major or minor papilla is the same in<br />

patients with or without PD. 15 Other abnormalities<br />

that have been associated with ARP include<br />

anomalous pancreaticobiliary union, choledochocele,<br />

duodenal duplication cyst and annular pancreas. 18<br />

BUSINESS BRIEFING: EUROPEAN GASTROENTEROLOGY REVIEW 2005<br />

<strong>Acute</strong> <strong>Relapsing</strong> <strong>Pancreatitis</strong><br />

Figure 1: Coronal View on T2-weighted MRI, S-MRCP and ERCP of a<br />

42-year-old Man with Prior Cholecystectomy having Presented with<br />

10 Attacks of <strong>Acute</strong> <strong>Pancreatitis</strong> over Two Years<br />

A B<br />

C D<br />

A 42-year-old man with a history of cholecystectomy presented 10 attacks of acute pancreatitis over two years during which<br />

he was admitted to hospital five times. This coronal view on T2-weighted MRI (A) and S-MRCP (B) showed a 2cm<br />

communicating cytic lesion at the junction of body and tail of the pancreas. ERCP demonstrated a normal ductal system in<br />

the head of the pancreas (C) and a typical branch duct type of intraductal papillary mucinous tumour (IPMT) with intraductal<br />

filling defect corresponding to mucus (D). A segmental pancreatectomy was performed and pathology revealed a branch duct<br />

IPMT with in situ carcinoma.<br />

An isolated, unexplained pancreatic duct stricture<br />

discovered during the work-up of a first episode of<br />

acute pancreatitis in a patient over 35 years of age<br />

without predisposing cause requires exclusion of an<br />

underlying pancreatic carcinoma. 5<br />

Intraductal papillary mucinous tumour (IPMT) is the<br />

most frequent neoplasm associated with ARP. It is an<br />

intraductal pre-malignant lesion producing mucin that<br />

blocks the pancreatic duct, thus impeding outflow and<br />

encouraging bouts of pancreatitis. IPMT is characterised<br />

by dilation and filling defects of the main pancreatic<br />

duct or of the branch duct system (see Figure 1). 19<br />

Miscellaneous Causes<br />

Genetic diseases can be identified as rare causes of acute<br />

and recurrent pancreatitis mainly in subjects with early<br />

onset of pancreatitis and with a history of first- or<br />

second-degree relatives with unexplained pancreatitis. 4<br />

These inherited causes are mainly related to cystic<br />

fibrosis transmembrane conductance regulator gene<br />

mutations, and trypsinogen-gene mutations.<br />

Autoimmune pancreatitis is also a rare entity<br />

characterised by mild pancreatitis associated with<br />

abnormal laboratory findings (e.g. elevated serum<br />

immunoglobulin (Ig)G4 levels and presence of autoantibodies),<br />

imaging studies showing a diffusely<br />

2


3<br />

Reference Section<br />

Figure 2: MRI and MRCP Images of a 51-year-old Woman having<br />

Presented with Seven Attacks of <strong>Acute</strong> <strong>Pancreatitis</strong> Since 1998<br />

A<br />

B C<br />

A 51-year-old woman presented seven attacks of acute pancreatitis since 1998. She underwent a cholecystectomy in<br />

May 2000, but acute pancreatitis recurred, with four attacks during the last 12 months. In this case, there was no alcohol<br />

abuse, no smoking and no drugs involved. A genetic origin remained possible, as family history was positive for one<br />

third-degree relative with unexplained ARP. However, genetic testing was negative in the patient. The CT scan showed no<br />

calcifications. T2-weighted MRI (A) and MRCP before (B) and after (C) secretin injection that were performed one week<br />

after the last attack of pancreatitis demonstrated a normal pancreatic gland and a normal main pancreatic duct. The<br />

dynamic response to secretin was also normal with a normal duodenal filling (C). Endoscopic ultrasonography was also<br />

performed and was normal. A pancreatic SOD type 2 is suspected (based on pancreatic-type pain and increased pancreatic<br />

hydrolases without dilation of the main pancreatic duct). An ERCP with dual endoscopic sphincterotomy and transient main<br />

pancreatic duct stenting has been proposed to the patient if another attack occurs.<br />

swollen pancreas and irregular narrowing of the duct<br />

due to lymphoplasmacytic infiltration, responding<br />

favourably to steroid therapy and sometimes<br />

associated with other autoimmune disorders. 5<br />

Finally, very rare miscellaneous causes of ARP<br />

include vascular disorders, infections (e.g.<br />

tuberculosis, virus and parasite), and tropical<br />

pancreatitis. 4 Among the patients without an obvious<br />

cause for ARP, this means that around 20% to 30% of<br />

all cases with ARP, SOD, PD and occult biliary<br />

stones and tumours are generally considered as<br />

aetiological associated factors in 30%, 20%, 20% and<br />

10%, respectively, leaving only approximately 20% of<br />

‘idiopathic’ ARP related to genetic, autoimmune,<br />

infectious and really unknown factors (see Figure 2). 20<br />

Initial Evaluation Procedures<br />

History and physical examination are probably the<br />

most important parts of the initial evaluation to<br />

search evidence for alcohol abuse, drug-induced<br />

pancreatitis and a family history of pancreatitis.<br />

Routine blood tests should include liver function tests<br />

within 24 to 48 hours of onset of symptoms (a three-<br />

fold or greater increase in the alanine aminotransferase<br />

(ALT) level is generally regarded as the best indicator<br />

of gallstone-induced pancreatitis), and the serum levels<br />

of calcium and triglyceride soon after admission<br />

(because of the drop in calcium and triglyceride levels<br />

due to fasting and administration of intravenous<br />

fluids). 8 Abdominal U/S is routinely performed in<br />

patients without previous cholecystectomy in order to<br />

detect gallbladder stones (with an accuracy of >90%).<br />

Contrast-enhanced CT scan is usually performed<br />

either in all patients during their first episode to<br />

confirm the diagnosis of acute pancreatitis and to<br />

assess the severity, 8 or only when the attack is severe,<br />

when the course is complicated, when aetiology<br />

remains unclear or in the elderly. 2<br />

Recently, the use of gadolinium-enhanced dynamic<br />

MRI was found to be comparable with contrastenhanced<br />

CT for the assessment of the severity of<br />

acute pancreatitis, while avoiding the use of<br />

iodinated contrast medium and radiation, and with<br />

the ability to identify bile duct stones more<br />

accurately than CT. 21<br />

S-MRCP should be considered as the first-choice<br />

procedure in the diagnostic algorithm of ARP (see<br />

Figure 3), because its diagnostic accuracy in detecting<br />

the various aetiological lesions of ARP is similar to<br />

that of ERCP without carrying the risk of potential<br />

ERCP-related complications. This initial work-up<br />

during an attack of pancreatitis detects the causes of<br />

ARP in about 70% of cases. 2<br />

Further Evaluation Procedures<br />

If the initial work-up following an attack of<br />

pancreatitis is negative and successive attacks occur,<br />

or if the first episode of pancreatitis is moderate to<br />

severe or occurs after the age of 40 years of age, a<br />

more extensive evaluation will reveal a diagnosis in<br />

around two-thirds of this group of patients. 2<br />

Advanced laboratory analysis may include genetic<br />

testing in patients younger than 40 years of age,<br />

tumour markers (carbohydrate antigen (CA) 19–9)<br />

in patients older than 40 years of age with a positive<br />

family history or with tobacco use, and serological<br />

markers of autoimmune pancreatitis if imaging<br />

studies are compatible with this diagnosis.<br />

As an additional diagnostic procedure, endoscopic<br />

ultrasonography (EUS) is able to postulate a cause for<br />

pancreatitis in approximately one-third of the<br />

patients with ARP for whom conventional<br />

evaluation, including transabdominal U/S and<br />

pancreatic CT with contrast injection, is negative. 22<br />

Due to its complication rate being lower than that of<br />

ERCP, EUS should be performed earlier in the<br />

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Figure 3: Recommended Algorithm for the Diagnostic Management of ARP<br />

diagnostic algorithm of ARP, where no evident<br />

cause is identified after initial evaluation procedures.<br />

ERCP may be indicated for diagnostic purpose in<br />

the few patients who suffer two or more attacks of<br />

acute pancreatitis in whom the aetiology of ARP<br />

cannot be achieved using high-quality S-MRCP<br />

and EUS. The aim of diagnostic ERCP is to<br />

perform ancillary procedures that may improve the<br />

diagnostic accuracy, such as brush cytology or<br />

biopsy in suspected neoplasm, minor papilla<br />

cannulation in suspected PD to clearly demonstrate<br />

a santorinicele (defined as focal cystic dilation of the<br />

termination of the dorsal pancreatic duct at the<br />

minor papilla), 23 sphincter of Oddi manometry in<br />

suspected SOD or collection of bile in suspected<br />

occult biliary stones. 7,24 However, ERCP is<br />

associated with a 3% to 5% complication rate, which<br />

is much higher in patients with a history of<br />

pancreatitis and may rise to 30% in cases with<br />

suspected SOD. 25 Nowadays, sphincter of Oddi<br />

manometry tends to be replaced by the non-invasive<br />

S-MRCP, 26 providing information regarding the<br />

morphology of the pancreatic gland, the dynamics of<br />

the emptying of the main pancreatic duct and the<br />

functional status of the exocrine pancreas through<br />

assessment of the duodenal filling after secretin<br />

administration. Therefore, ERCP has evolved from<br />

a diagnostic procedure to an almost exclusively<br />

therapeutic procedure for the treatment of<br />

<strong>Acute</strong> <strong>Relapsing</strong> <strong>Pancreatitis</strong><br />

ARP = acute relapsing pancreatitis; Lab = laboratory data; U/S = abdominal ultrasound; CT = computed tomography; S-MRCP = secretin-enhanced magnetic resonance cholangio-pancreatography; EUS = endoscopic<br />

ultrasonography; MRC = magnetic resonance cholangiography; BD = bile duct; ERCP = endoscopic retrograde cholangio-pancreatography; APBU = anomalous pancreaticobiliary union; CP = chronic pancreatitis;<br />

SOD = sphincter of Oddi dysfunction; SOM = sphincter of Oddi manometry; IPMT = intraductal papillary mucinous tumor; FNA = fine needle aspiration; PD = pancreas divisum.<br />

This figure is based on a review of current literature and on the author’s personal experience.<br />

abnormalities found by less invasive imaging<br />

techniques such as S-MRCP and EUS. 27<br />

Management<br />

BUSINESS BRIEFING: EUROPEAN GASTROENTEROLOGY REVIEW 2005<br />

{<br />

After a negative initial evaluation in patients younger<br />

than 40 years of age with only one mild episode of<br />

unexplained acute pancreatitis, expectant approach<br />

and no further testing is an acceptable management<br />

strategy, because the medium-term recurrence rate is<br />

believed to be low and the incidence of malignant<br />

neoplasm is low in patients with no family history of<br />

pancreatic cancer and no use of tobacco. 28,29<br />

However, in patients older than 40 years of age, with<br />

more than one attack of acute pancreatitis or when<br />

the initial attack is severe, a systematic identification<br />

and/or elimination of correctable inciting factors is<br />

required (see Figure 3). 4<br />

Occult biliary stones can be demonstrated using<br />

repeated U/S (for the gallbladder) or EUS (for the<br />

common bile duct) and treated using endoscopic<br />

biliary sphincterotomy (EBS) and laparoscopic<br />

cholecystectomy if the gallbladder is in situ.<br />

Early ERCP and EBS are safe and beneficial,<br />

particularly in severe biliary pancreatitis and when<br />

there is evidence of bile duct obstruction or<br />

cholangitis (see Figure 4). 30<br />

4


5<br />

Reference Section<br />

Figure 4: Potential Treatment Strategies According to the Most Probable Cause of <strong>Acute</strong> <strong>Relapsing</strong> <strong>Pancreatitis</strong><br />

ARP = acute relapsing pancreatitis; ERCP = endoscopic retrograde cholangio-pancreatography; EBS = endoscopic biliary sphincterotomy; EUS = endoscopic ultrasonography; MRC = magnetic resonance<br />

cholangiography; BD = bile duct; UDCA = ursodeoxycholic acid; MPD = main pancreatic duct; APBU = anomalous pancreaticobiliary union; CP = chronic pancreatitis; EPS = endoscopic pancreatic sphincterotomy;<br />

SOD = sphincter of Oddi dysfunction; ES = endoscopic sphincterotomy; PD = pancreas divisum; S-MRCP = secretin-enhanced magnetic resonance cholangio-pancreatography.<br />

This figure is based on a review of current literature and on the author’s personal experience.<br />

Empiric administration of a low-fat diet and oral<br />

therapy with ursodeoxycholic acid (UDCA) have<br />

been proposed for patients with suspected biliary<br />

microlithiasis or sludge before proceeding to more<br />

technically demanding investigations in high-risk<br />

patients or patients already cholecystectomised or<br />

unfit for cholecystectomy. 6,8<br />

At present, bile analysis and sphincter of Oddi<br />

manometry are less often performed, because these<br />

tests are invasive, insensitive and only available at<br />

tertiary institutions. 11,24 Available data suggest that,<br />

in suspected pancreatic SOD (on the basis of either<br />

a basal dilation of the main pancreatic duct or an<br />

abnormal dynamic response of the pancreatic duct<br />

at S-MRCP), a dual endoscopic biliary and<br />

pancreatic sphincterotomy, whether at single or<br />

separate sessions, yields significantly better response<br />

than EBS alone. 8,11<br />

However, the risk of post-sphincterotomy<br />

pancreatitis is five times higher for this indication<br />

than for other indications. 31 Placement of a transient<br />

pancreatic stent might reduce this risk when the<br />

accessory duct is not patent. 32 This stent usually<br />

migrates spontaneously, but in case migration does<br />

not occur, it should be removed for 10 to 14 days<br />

following dual endoscopic sphincterotomy.<br />

The selection of patients for treatment of ARP<br />

associated with PD is difficult, because there is<br />

currently no diagnostic modality that identifies<br />

patients who may benefit from dorsal pancreatic<br />

duct decompression. 13<br />

S-MRCP could be indicative of true or relative<br />

stenosis of the minor papilla if prolonged dilation<br />

of the main pancreatic duct is observed after<br />

secretin administration. 15<br />

Endoscopic therapy for patients with ARP<br />

associated with PD consists of minor papilla<br />

sphincterotomy, stent insertion or a combination of<br />

both. 33 The majority of therapeutic trials are small<br />

retrospective case series with only one randomised<br />

controlled trial on 19 patients showing a clinical<br />

benefit after dorsal duct stenting at a mean followup<br />

of 24 months. 34 Prolonged stenting of the dorsal<br />

main pancreatic duct should be avoided because of<br />

the risk of inducing pancreatic damage, mainly<br />

when the ductal morphology is initially normal. 35<br />

Therefore, it is recommended that a stent is placed<br />

after minor papilla sphincterotomy to prevent early<br />

obstruction secondary to oedema and early<br />

restenosis, but that the stent is removed in two to<br />

four weeks if it has not migrated spontaneously into<br />

the duodenal lumen. 35<br />

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In conclusion, ARP should be evaluated in specialist<br />

referral centres as diagnosis is time-consuming,<br />

usually expensive and may expose the patient to a<br />

substantial morbidity. Future prospective clinical<br />

trials should define which patients with idiopathic<br />

ARP (whether or not it is associated with<br />

References<br />

BUSINESS BRIEFING: EUROPEAN GASTROENTEROLOGY REVIEW 2005<br />

<strong>Acute</strong> <strong>Relapsing</strong> <strong>Pancreatitis</strong><br />

anatomical variants) are most likely to benefit from<br />

endoscopic intervention. These studies should allow<br />

appropriate patient selection and the development<br />

of novel, effective, preventive and therapeutic<br />

strategies to improve the clinical condition of<br />

these patients. ■<br />

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18. Delhaye M, Matos C, Devière J, “<strong>Acute</strong> relapsing pancreatitis. Congenital variants: diagnosis, treatment, outcomes”, J.<br />

Pancreas (2001);2: pp. 373–381.<br />

19. Farrell J J, Brugge W R, “Intraductal papillary mucinous tumor of the pancreas”, Gastrointest. Endosc. (2002);55: pp.<br />

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20. Coyle W J, Pineau B C, Tarnasky P R, Knapple W L, Aabakken L, Hoffman B J, Cunningham J T, Hawes R H,<br />

Cotton P B, “Evaluation of unexplained acute and acute recurrent pancreatitis using endoscopic retrograde<br />

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21. Arvanitakis M, Delhaye M, De Maertelaere V, Bali M, Winant C, Coppens E, Jeanmart J, Zalcman M, Van Gansbeke<br />

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treatment”, Gastrointest. Endosc. (2000);52: pp. 262–267.<br />

6


7<br />

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BUSINESS BRIEFING: EUROPEAN GASTROENTEROLOGY REVIEW 2005

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