Intraoperative ERCP for Management of Gallbladder and Common Bile Duct Stones

It is not an uncommon scenario to have CBD stones in association with gallbladder stones. There is a general agreement in the surgical society that CBD stones should be removed. The classic option is to do open cholecystectomy and CBD exploration. With the emergence of minimally invasive surgery, namely laparoscopic cholecystectomy and ERCP, the therapist has better option to treat such patients such as preoperative ERCP, postoperative ERCP, and laparoscopic CBD exploration. The latest advance in that field is the use of ERCP at the time of laparoscopic cholecystectomy, i.e. intraoperative ERCP. This chapter with discuss the issue of minimally invasive management of cholecystocholedocholithiasis stressing on intraoperative ERCP.


Introduction
Patients undergoing LC may have concomitant CBD stones in about 15% of cases [1,2].These CBD stones may pass spontaneously in about one third of cases [3], but the complications of retained CBD stones are often dangerous.These complications include cholangitis, liver abscess, biliary pancreatitis.Therefore, there is a general agreement among biliary surgeons that CBD stones should be removed once detected even if asymptomatic [1,4].
The orthodox therapeutic option in this setting is to solve the two problems by removing the gallbladder and at the same time retrieving CBD stones via open surgery.In fact this option is a good option with good outcome.Nevertheless, it may be associated with a considerable morbidity (11-14%) and even mortality (0.6-1%) particularly in elderly patients [5].
Two important revolutions had emerged in the past few decades that changed the face of CBD stone management and gave therapists new safe and minimally invasive options when dealing with such patients.The first one was the development of endoscopic retrograde cholangiopancreatography (ERCP) and the second is laparoscopic cholecystectomy (LC).ERCP has become a widely available and routine procedure, whilst open cholecystectomy has largely been replaced by a laparoscopic approach, which is considered the treatment of choice for gallbladder removal since NIH Consensus on 1993 [6].
Nowadays, not only biliary surgeons and endoscopists but also patients prefer minimally invasive options over old open surgery.This is simply because of the well-known benefits of better cosmesis, less adhesions, less wound complications, less postoperative pain and analgesia, and fast recovery.

Minimally invasive option
Minimally invasive options for treatment of gallbladder and concomitant CBD stones may be categorized in two sections; one-stage and two-stage options.In the two-stage option, the two pathologies are treated at timely different occasions.This option includes preoperative ERCP followed by LC and LC followed later on by postoperative ERCP.In the one-stage option, the two pathologies are treated in the same sitting under the same anesthesia, and it includes LC/laparoscopic CBD exploration (LCBDE) and LC/intraoperative ERCP.

Preoperative ERCP followed by LC
In this two-stage strategy the CBD stones are removed firstly to be followed later on by LC at another stetting.Actually this strategy is the most commonly used treatment policy worldwide [7] as it had been proved to be efficient and safe [8][9][10].
Despite its advantages it has a myriad of disadvantages.Biliary endoscopists may not find CBD stones at the time of ERCP and this means that you are exposing your patient to unnecessary and at the same time risky maneuver.The reported incidence of false negative preoperative ERCP is about 40-70% which is a high figure [11][12][13].Ordering magnetic resonance cholangiopancreatography (MRCP) before preoperative ERCP may increase the sensitivity and specificity of preoperative detection of CBD stones [14,15] but CBD stones may spontaneously pass before ERCP.More than 50% of patients with CBD stones may have spontaneous passage of the stones [16].
At the time of LC, laparoscopists still could identify CBD stones despite successful pre-LC endoscopic clearance during LC.Pierce and collaborators reported an incidence of 12.9% [17].These stones may be missed at the time of pre-LC ERCP or new stones that passed from the gallbladder onto the CBD in period between the two procedures.
Preoperative ERCP definitely affects the subsequent surgery.Some authors reported more conversion to open cholecystectomy, longer operating time, higher morbidity, especially postoperative infection, and longer hospital stay [18][19][20].
Finally, the time delay between preoperative ERCP and LC, may allow some patients to escape LC being satisfied by the results of preoperative ERCP [21][22][23].Those escaping patients are subjected to recurrent biliary problems [24,25].

Post-LC ERCP
Herein, at the first stage the gallbladder is removed by LC to be followed later on by postoperative ERCP as a second stage.The disadvantage of this strategy is obvious.Failed post-LC ERCP, which may the case in up to 5% of cases, necessitates a third stage for operative removal of CBD stones [26,27].

LCBDE
In the surgical literature, LCBDE has been proved to be a safe, efficient and cost-effective minimally invasive option [28,29].Many authors reported excellent Intraoperative ERCP for Management of Gallbladder and Common Bile Duct Stones DOI: http://dx.doi.org/10.5772/intechopen.83352results for LCBDE with a high stone clearance rates up to 100% associated with a low morbidity and mortality rates [30][31][32].
Besides being a one-stage procedure, the most important advantage of LCBDE is avoidance of ERCP and ES.ERCP is not a totally benign procedure, it may have a short-term consequences as pancreatitis, bleeding and perforation, medium-term complications as cholangitis and recurrent stone formation, or even long-term problems as bile duct malignancy.
In the light of all these advantage, LCBDE would be expectedly to be the standard option for management of gallstones and concomitant CBD stones.But this is not the case in real surgical life for many reasons.LCBDE needs experience and a long learning curve.This is mainly due to the need for laparoscopic suturing skills that must be mastered by the surgeon for T-tube insertion or even primary CBD closure.In case of large, multiple or impacted stones the procedure may be time consuming and exhausting.Finally, LCBDE required specialized instruments that may be not readily available (such as real-time fluoroscopy) or delicate and nondurable (such as fragile 3-mm choledochoscope).

Advantages
Intraoperative ERCP has many theoretical benefits that makes this option of big value.It is a one-session option with single anesthesia and single hospital stay and this is not only cost-effective but safer and seems likable by patients and surgeons.Intraoperative ERCP avoids opening the CBD for stone removal and thereby avoids laparoscopic suturing which needs some experience.Unlike postoperative ERCP, there is no possibility of failure of stone extraction.Simply if intraoperative ERCP failed, stones are removed under the same anesthesia either by open or laparoscopic CBD exploration depending on facilities and expertise.Another final advantage is the performance of ES at intraoperative ERCP.This definitely facilitates subsequent postoperative ERCP if indicated for retrieval of any retained CBD stones.
Nevertheless, all the above mentioned benefits of intraoperative ERCP did not result in widespread application and adoption of this approach.This is because of organizational problems.It may be difficult to have the immediate availability of ERCPist with all required equipment and facilities in the operating room at the time of cholecystectomy.

Technique
There are many described techniques for performing Intraoperative ERCP during LC but they all fall in two big categories; standard ERCP during LC and combined laparoendoscopic (rendezvous) technique.

Standard ERCP
The first described one was standard ERCP during LC.During LC intraoperative cholangiography is performed and if yielded positive result, intraoperative ERCP is performed in the operating room.After verification of clearance of CBD, LC was continued [37,40].This technique has two main shortcomings; firstly, cannulation of the bile duct in the supine position is definitely more difficult than the standard prone/left lateral position and secondly, the resultant bowel distension from endoscopic manipulation may render subsequent LC more challenging.
A variation of this technique is postponing ERCP till after completion of LC and closure of the ports.This is to avoid the two mentioned problems of supine position and bowel distension making LC more demanding [41].However, the obvious disadvantage of this approach is the problem of failure.

Rendezvous technique
This technique was first described by Cavina et al. [35].At laparoscopy the surgeon passes a basket through the opened cystic duct and threaded down to the duodenum.At endoscopy a sphincterotome is passed through the scope biopsy channel.The basket caught the sphincterotome and guides it inside the CBD for sphincterotomy.
A simpler modification of the RV technique was proposed by others and now is considered the gold standard technique of intraoperative ERCP [12,33,34].At laparoscopy a standard ERCP guidewire is passed through the opened cystic duct and threaded into the CBD under fluoroscopic guidance till protruding into the duodenum out of the papilla.At endoscopy a snare or basket is passed and catches the protruding guidewire, which is withdrawn into the biopsy channel of the scope and then a standard sphincterotome is threaded over this guidewire for subsequent sphincterotomy (Figure 1).
© 2019 The Author(s).Licensee IntechOpen.This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Author details
Ahmed Abdelraouf Elgeidie Gastrointestinal Surgery Center, Mansoura University, Mansoura, Egypt *Address all correspondence to: ahmedraoaf8@gmail.comRV technique rapidly became the favorite technique of intraoperative ERCP.This is mainly due to two reasons; the high success cannulation rate in supine position and reduction of postprocedural hyperamylasemia and acute pancreatitis [34,42,43].The obvious cause for reduction of the risk of hyperamylasemia and pancreatitis in intraoperative ERCP compared to standard ERCP is selective cannulation of CBD without inadvertent cannulation and dye injection of pancreatic duct, which is one of the risk factors for post-ERCP pancreatitis [12,44].
Some technical problems may occur during RV technique.Sometimes it may be difficult for the guidewire to negotiate the spiral valves of the cyst duct.This problem can be overcome by opening the cystic duct as close as possible to its juncture with CBD.Rough manipulation may result in tearing of the cystic duct and this definitely makes subsequent steps more difficult.When there is a deeply impacted stone at the papilla, the guidewire may fail to pass into the duodenum.Finally, bowel distension usually make subsequent LC more difficult.This problem can be easily solved by completely dissecting the Calot triangle before the endoscopic phase [42].

Conclusion
Intraoperative ERCP for managing patients with concomitant gallbladder stones and CBD stones is a promising technique that is efficient, cost-effective and safe.The only limitation for its widespread use is lack of immediate availability of endoscopists and endoscopic equipment necessary for the procedure.When local resources and expertise are available it should be offered to fit patients.Surgeons are encouraged to learn ERCP and to use it as an important tool in their hands when dealing with such patients.

Figure 1 .
Figure 1.Rendezvous technique of intraoperative ERCP.(A) Laparoscopic view showing standard ERCP guidewire passing through the cystic duct into CBD; (B) fluoroscopic view showing passage of the guidewire into the duodenum; (C) endoscopic view showing snare catching the protruding guidewire; (D) endoscopic view showing standard sphincterotome threaded over the guidewire for sphincterotomy.