Classification

Strasberg Classification Of Bile Duct Injury : Impact And Management Challenges

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Antonio Pesce, Stefano Palmucci, Gaetano La Greca, Stefano Puleo Department of Medical, Surgical Sciences and Advanced Technologies “G.F. Ingrassia”, University of Catania, Catania, Italy Abstract: Iatrogenic bile duct injuries (BDIs) after laparoscopic cholecystectomy, being one of the most common performed surgical procedures, remain a substantial problem in gastrointestinal surgery with a significant impact on patient’s quality of life. The primary aim of this review was to discuss the classification of BDIs, the proposed methods to prevent biliary lesions, the associated risk factors, and the management challenges depending on the timing of recognition of the injury, its extension, the patient’s clinical condition, and the availability of experienced hepatobiliary surgeons. Early recognition of BDI is of paramount importance and limiting the diagnosis delay is crucial for an optimal postoperative outcome. The therapeutic management depends on the type and gravity of the biliary lesion, and includes endoscopic, radiologic, and surgical approaches. Keywords: bile duct injury, laparoscopic cholecystectomy, biliary anatomy, early recognition, management challenge, endoscopic treatment, surgical repair

Introduction

Laparoscopic cholecystectomy (LC) is one of the most frequently performed procedures worldwide in general surgery.1 Annually, more than 750,000 procedures are performed in the US.2 Bile duct injury (BDI) represents the most serious complication of LC, with an incidence of 0.3%–0.7%, resulting in a significant impact on quality of life (QoL), overall survival, and frequent medico-legal liabilities.1–4 The incidence of iatrogenic BDI has significantly gone up since LC became the “gold standard” in the treatment of symptomatic cholelithiasis. It has been demonstrated that the primary cause of BDI is the misinterpretation of biliary anatomy in 71%–97% of all cases.1 Over the years, various classifications of biliary injuries have been proposed and different methods have been described to prevent iatrogenic biliary tract lesions. Early recognition of BDI is of paramount importance. The optimal treatment is influenced by the timing of recognition of the injury, the extent of BDI, the patient’s clinical condition, and the availability of experienced hepatobiliary surgeons. This article aims to discuss the classification and management challenges of iatrogenic BDIs after cholecystectomy.

Đang xem: Strasberg classification of bile duct injury

Classification of BDIs

Before the advent of LC, the most frequent lesion to biliary tract was represented by bile duct stricture, and biliary injuries were classified using the “Bismuth classification”5 according to the level of biliary injury. This classification includes five types of bile duct lesions according to the distance from the hepatic hilus, the level of injury, the involvement of bile duct bifurcation, and individual right sectoral duct. Few years later, Strasberg et al6 proposed a new classification, similar to the Bismuth, but incorporating additional biliary injuries seen more commonly in the laparoscopic era, in particular biliary leaks. In the “Strasberg classification”, biliary injuries were stratified form type A to type E, as summarized in Table 1. McMahon et al7 proposed another classification by distinguishing major and minor biliary injuries: lacerations under 25% of the common bile duct (CBD) diameter or cystic duct-common hepatic duct (CD-CHD) junction were considered as minor injury, whereas transection or laceration over 25% of CBD diameter and postoperative bile duct stricture were classified as major injury. The “Stewart-Way classification”8 involved four classes based on the mechanism and anatomy of biliary injury, as shown in Figure 1. This classification arose from the analysis of operative reports, providing the human mistakes and cognitive processes involved in the mechanisms of BDIs. Class I injury occurs in two ways: 1) either the CBD is mistaken for the cystic duct, but the error is recognized before CBD is divided in 72% of cases, or 2) an incision made in the cystic duct for the cholangiogram catheter is unintentionally extended into the CBD (28% of cases). Class II injuries consist of lateral damage to the CHD with resultant stricture and/or leak. This type of injury occurs when clips or electro-cautery are used too close to the CBD, mainly in cases where visibility is limited due to severe inflammation or excessive bleeding. Class III injuries are the most common (about 60% of cases) and involve complete transection of the main bile duct, which always includes the CD-CHD junction. Class IV injuries include transection or leak of the right hepatic duct (RHD) or posterolateral sectoral duct, often combined with injury to the right hepatic artery.

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Table 1 Bismuth and Strasberg classification

Abbreviations: –, not applicable; RHD, right hepatic duct; CBD, common bile duct; CHD, common hepatic duct.

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Figure 1 Stewart-Way classification of bile duct injuries.

The “Amsterdam classification” proposed by Bergman et al in 19969 is also very commonly used in many articles, especially among endoscopists. This classification includes four types of ductal injury: type A with leakage from cystic ducts or peripheral hepatic radicles, type B presenting as major bile duct leakage, type C showing an isolated ductal stricture, and type D with complete transection of the bile duct.

For an easy reading, we have chosen the Stewart-Way classification system in this manuscript, as it better describes the mechanisms of biliary lesion during LC, including also concomitant vascular injuries.

Prevention of iatrogenic BDI

Over the years, various methods have been proposed and described in the scientific literature to prevent iatrogenic biliary tract lesions. They are summarized in Table 2. The “critical view of safety (CVS)” technique was introduced by Strasberg in 199510 and it is considered the gold standard to perform a safe cholecystectomy with identification of biliary structures during dissection. Three criteria are required to achieve the CVS: 1) the hepatocystic triangle must be cleared of adipose and fibrotic tissues; the CBD and CHD must not be exposed; 2) the lower third of the gallbladder must be separated from the liver bed to expose the cystic plate; and 3) two and only two structures should be seen entering the gallbladder. CVS was conceived not as a way to do LC but as a way to avoid biliary injury.

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Table 2 Summary of proposed methods to prevent bile duct injuries

Note: B-SAFE: B, bile duct; S, sulcus of Rouvière; A, hepatic artery; F, umbilical fissure; E, enteric/duodenum.

In such cases, some surgeons prefer performing the infundibular method in order to work very close to gallbladder infundibulum, reducing the risk of biliary injuries, but care should be taken with “hidden cystic duct” syndrome which presents a deceptive appearance of a false infundibulum that misleads the surgeon into identifying the CBD as the cystic duct.11 The “antegrade dissection or fundus first/dome-down technique” represents a way of dissection from the gallbladder fundus up to the infundibulum away from Calot’s triangle.12 In this way, the gallbladder is left pedunculated by the cystic artery and cystic duct, which can be clipped and divided in turn, reducing the risk of biliary lesions. Another easy, safe, and definitive operation for the “difficult gallbladder” is described and has been termed “subtotal or partial cholecystectomy”,13 consisting in leaving the posterior wall of the gallbladder attached to the liver and securing the cystic duct at its origin from within the gallbladder.

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Different anatomic landmarks have been described: among them, in 1924, Henri Rouvière, a French surgeon, described a 2–5 cm sulcus running to the right of liver hilum, anterior to the caudate lobe, and usually containing the right portal triad or its branches.14 It can be considered a useful landmark site to start dissection of the hepatocystic triangle during LC.15 The “Rouvière’s sulcus” is present in the majority of patients, ranging from 68% to 90%,16 and is clearly visible during laparoscopy, being visible in one form or the other (a sulcus, a slit, or a scar). Another anatomic landmark to guide gallbladder dissection is represented by the “cystic lymph node” or Mascagni’s node, which always lies lateral to the biliary tree and should form the medial end point of dissection.17

Some authors proposed a mnemonic “B-SAFE method”, by using five anatomic landmarks (B, bile duct; S, sulcus of Rouvière; A, hepatic artery; F, umbilical fissure; E, enteric/duodenum) to correctly place their cognitive map during dissection.18

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The routine use of “intra-operative cholangiography (IOC)” has been proposed for the better declaration of biliary anatomy, detection of silent CBD stones, and reduction of incidence of BDIs, but it is burdened by morbidity and mortality and hence should be performed in facilities where the necessary equipment and experience are available.1,19,20 The opinions about the “routine” or “selective” use of IOC still represent a matter of debate.1,19

“Laparoscopic ultrasound (LUS)” was shown to provide highly sensitive mapping of the extra-hepatic biliary anatomy but the difficult learning curve and the lack of randomized controlled trials have reduced its use in clinical practice.21,22

One of the latest innovations in minimally invasive technology is fluorescence image-guided surgery; “near-infrared fluorescent cholangiography (NIRF-C)” represents a novel intra-operative imaging technique that allows a real-time enhanced visualization of the extrahepatic biliary tree by fluorescence.23–25 NIRF-C well represents a useful method to identify the CVS with the aid of real-time fluorescent vision with a perfect combination between surgical anatomy and technical innovation, as shown in Figure 2.26

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Figure 2 Intra-operative real-time identification of biliary structures with visible light (VL) on left and by fluorescence (NIRF-C) on right.

Note: Cystic duct (CD) running parallel to the common hepatic duct (CHD).

Abbreviation: NIRF-C, near-infrared fluorescent cholangiography.

In some difficult situations, the opinion of a surgical colleague in vicinity during operation may also represent a valid alternative, the so-called “colleaguography”, in place of IOC or other methods, as proposed by some authors.27

Despite the plethora of publications and debates, there is still no consensus as to which method is the best to prevent BDIs during LC. Recently, highest consensus was achieved on the importance of the CVS and NIRF-C, as well as antegrade dissection or fundus first/dome-down technique and partial cholecystectomy as alternative techniques.28,29

A general recommendation is that in all cases of complicated cholecystectomies, the surgeon must not hesitate when considering conversion to open approach because there is no substitute for experience and caution in biliary surgery.

Risk factors

There are several risk factors which can contribute to the iatrogenic injury of the biliary tract: anatomical factors; patient-related factors; and factors related to the gallbladder disease, the surgical technique, and the surgeon. Among the anatomical factors, the numerous anatomical variants of the biliary tract represent a possible cause of iatrogenic lesion, for example, the different variants of the cystic duct, such as short cystic duct, cystic duct running parallel to the CBD, anomalies of the CD-CHD junction, presence of the hepatocystic duct, accessory cystic duct, the existence of aberrant bile ducts (eg, Luschka duct).30 Among the patient-related factors, severe obesity, previous surgery on the biliary tract, and underlying liver disease seem to be predisposing factors for peri-operative complications.

However, acute cholecystitis causes a series of modifications of the local anatomy (adhesions, thickening of the tissues, inflammation, bleeding) that are associated with an increased risk of iatrogenic lesion.31,32 Among the factors related to the technique, the laparoscopic approach itself represents a risk factor, hence the importance of a correct “learning curve” for young surgeons.33,34 The human factors also play a crucial role in the pathophysiology of the iatrogenic bile lesion: the excessive safety of the surgeon, the rush to finish the intervention, the fatigue and personal concerns of the surgeon, the performance anxiety, the superficiality of the surgical act, and the lack of humility in converting to open surgery in doubtful cases may determine a relevant damage to the biliary tree.8–35

LC can be seen as a trivial intervention but it could hide many difficulties with dramatic consequences. For these reasons, caution and experience are essential in biliary surgery.

Clinical presentation

Clinical presentation depends essentially on the extent and type of iatrogenic lesion, if this is not discovered intra-operatively. The presence of a possible biliary leak can start with non-specific symptoms, such as nausea, vomiting, bloating, widespread abdominal pain, general discomfort, and anorexia. Rarely, the patient presents the clinical picture of biliary peritonitis, despite large amounts of bile in the abdomen. The evolution of biliary leak is very subtle, because of the presence of these vague symptoms. Patients with stricture at level of the CBD, in cases where the CBD is mistaken for the cystic duct, will present the classic Charcot’s triad with pain in the right hypochondrium, fever, and jaundice. A general recommendation is that any alteration in the normal postoperative course after LC must suggest a possible damage to the biliary tract. For these reasons, a careful clinical evaluation of patients is essential. A delay in the diagnosis is crucial for the postoperative outcome.

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Timing of recognition

Early recognition of BDI is of paramount importance. Intra-operative recognition should typically prompt immediate surgical repair as this confers the best outcomes; however, 36,37 If the surgeon is inexperienced, an intra-abdominal drain should be placed, and the patient should be immediately transferred to a high-volume hepatobiliary center. There are several data suggesting that these injuries are best managed by a surgeon with expertise in biliary reconstruction with better outcomes.37–39 There are several factors that lead to a recognition of intra-operative lesion, but the most important is the surgeon’s awareness to suspect and/or evaluate for a BDI. Diagnosis often occurs in the immediate postoperative period (within 6 weeks post-intervention) or, in some cases, later (over 6 weeks). A careful clinical evaluation helps for a correct diagnosis. The appearance of persistent or abnormal abdominal pain in the right hypochondrium, the leakage of bile from drainage (if placed during surgery), a picture of biliary peritonitis, and the appearance of fever and jaundice with increased liver function tests are all elements supporting a diagnosis of any iatrogenic lesion of the biliary tree. Radiologic investigations should be obtained for the correct identification of the damage, its extension, and gravity and to plan therapeutic strategies. Abdominal ultrasound represents the first diagnostic tool aimed at finding any liver collections, dilatation of the CBD, and any associated vascular lesions.40 The abdominal computed tomography (CT) scan is the principal investigation that allows to define the possible presence of focal intra- or peri-hepatic fluid collections, ascites, biliary obstruction with upstream dilatation, or long-term sequelae of a long-standing bile stricture, such as lobar hepatic atrophy or signs of secondary biliary cirrhosis. The CT scan also allows to identify any associated vascular lesions, such as to the right hepatic artery.

Magnetic resonance cholangio-pancreatography (MRCP) represents the “gold standard” for the complete morphological evaluation of the biliary tree as it offers detailed information about the integrity of the biliary tract.41,42 MRCP can also be done with a contrast agent (a gadolinium-based contrast agent, the gadoxetic acid and its salt, gadoxetate disodium), and it is much more informative in bile leaks than plain MRCP.42 The use of a contrast agent during MRCP allows detection of active bile leakage by direct visualization of contrast material extravasation into fluid collections in addition to demonstrating the anatomical site of the leakage and the type of BDI. For example, in Figure 3 cystic duct leak was demonstrated at MRCP after gadoxetic acid injection. In the same way, hepatobiliary scintigraphy may confirm the presence of an active biliary leak with the progressive accumulation of the radiotracer inside the peritoneal cavity, but this examination is much less reliable. However, if fluid collection is found in ultrasound, CT, or MRCP, an abdominal drain should be placed right away under radiological guidance in order to improve patient’s clinical condition (peritonitis, sepsis, tissue repairing). If there is a delay of more than a week in operative treatment of Stewart-Way Class III or IV injuries, there should be a timeout for 2–3 months before operation. In this time frame, the patient needs to be stabilized and optimized for surgery. An optimal control of any intra-abdominal fluid collection, inflammation, and infection is essential, and is best achieved with percutaneous drainage.37

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