Biliary Injury

Despite the advantages of LC over OC, common bile duct injuries are seen more frequently in the laparoscopic approach (0.2% to 0.7%) than in OC (0.1% to 0.04%) (Konsten et al, 1993; Nuzzo et al, 2005; Soderlund et al, 2005; Ali et al, 2007; Karvonen et al, 2007). Retrospective analyses of CBD injuries reveal that the two most common factors associated with injury are acute cholecystitis, wherein the normal gallbladder and biliary anatomy is obscured or distorted because of indurated and/or edematous tissues, and misperceptions or inexperience on the part of the surgeon. A learning curve is also implicated. In a series of 350 LCs reviewed by Huang and colleagues, CBD injuries occurred more often in the first 10 to 15 operations performed by a surgeon (Huang et al, 1993). In addition to the classic direct CBD injuries caused by misidentification of the cystic and common bile ducts, clipping of the “tented” CBD may occur in cases specific to LC when applying the first clip on the cystic duct by excessive traction of the CBD into the clip itself (Fig. 38.1). These injuries can lead to stricture and obstruction of the CBD and may be avoided by placing the first clip with visualized distance from the cysticocholedochal junction (Duca et al, 2003). In a retrospective review of 10,000 patients undergoing LC in a single center by four separate surgeons with no documented CBD injuries, it was found that surgical experience, preoperative imaging, precise operative procedures, and conversion from LC to OC when needed are necessary prophylactic measures to prevent CBD injuries (Ou et al, 2009). In addition, regular reliance on the “critical view” technique, along with abandonment of the infundibular dissection approach, can optimize a safer dissection (Strasberg et al, 2000; Strasberg, 2002).

FIGURE 38.1 Depiction of a common bile duct “tent” injury.

Minor biliary leaks from the bed of the gallbladder, so-called Luschka leaks, may also be troublesome intraoperatively. Often, such leaks occur as a result of errant dissection into a deep plane of hepatic parenchyma. Accessory bile ducts found in the gallbladder bed may be controlled by ligation when transection and spillage is identified, but if these leaks are not identified in the operating room, postoperative bilomas and even bilious ascites may ensue. If the drainage of these “minor” leaks exceeds 500 mL over a 24-hour period, endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy and transampullary stenting is useful in decompressing the biliary system and preventing reoperation (Pinkas & Brady, 2008; Pawa & Al-Kawas, 2009).

Hemorrhage

In a retrospective analysis of 9542 consecutive LCs by Duca and colleagues (2003), intraoperative hemorrhage occurred in 224 patients for an incidence of 2.3%. Bleeding was most commonly from the gallbladder bed and was treated with a fibrin-collagen patch. Conversion to an open procedure with suturing of the gallbladder peritoneum was required in five patients, however. It was noted that such hemorrhage from the gallbladder bed was encountered most commonly in patients with acute cholecystitis or cirrhosis. Tangential lesions of the cystic artery or, less commonly, total sectioning of the cystic artery occurred in 95 cases. In the majority of cases, the intraoperative bleeding was controlled laparoscopically with hemostatic clips, but conversion to an open procedure occurred in one patient. Damage to the hepatic artery occurred in one patient and required immediate open conversion. Finally, bleeding from the greater omentum was seen in 18 patients and was controlled laparoscopically in 16 patients.

Another source of massive intraoperative blood loss is from inadvertent incursion into a deep plane of hepatic parenchyma, where distal tributaries of the middle hepatic vein may be encountered. In fact, 10% of patients harbor large branches of the middle hepatic vein directly adjacent to the gallbladder fossa, which may lead to significant hemorrhage in instances of even minimal parenchymal dissection (Ball et al, 2006). Furthermore, postoperative hemorrhage may occur from trocar placement, or the bleeding may be from the cystic artery itself, albeit less than 1% of the time (Marakis et al, 2007). Finally, it should be recognized that management of profuse bleeding during LC, particularly when unexpected, can be fraught with significant ramifications that include major vascular ligation (hepatic artery, portal vein) and/or bile duct injury. This occurs from haphazard clip application or aggressive use of cautery in a poorly visualized field, thus conversion to open laparotomy is often the more prudent approach.

Dropped Stones

In 6% to 40% of LC procedures perforation of the gallbladder with subsequent spillage of gallstones occurs (Helme et al, 2009). These stones are usually retrieved under direct visualization, and the Morison pouch can be copiously irrigated; however, in 13% to 32% of patients these stones may be “lost” (Helme et al, 2009). This scenario contributes to postoperative morbidity 0.1% to 6% of the time, and the effects may vary in presentation and timing (Hand et al, 2006). Although such complications are infrequent, the patient may have symptoms such as fever, chronic abdominal pain, and/or intestinal obstruction. Furthermore, a meta-analysis by Zehetner and colleagues (2007) revealed that complications from “dropped stones” may present months to years after LC, most commonly as subcutaneous or intraabdominal abscesses or fistulas to less frequent manifestations such as liver abscesses or bacteremia. Additionally, stones have also been reported to erode into the chest cavity, causing empyema and broncholithiasis with expectoration (Zehetner et al, 2007). Perforation of the gallbladder during LC often occurs as the organ is dissected off of the liver by excessive retraction, direct puncture, or during omental adhesiolysis, but it may also occur as the gallbladder is being removed through trocar sites. Regular use of a retrieval bag may decrease complications from removal through trocar sites. Iatrogenic perforation of the gallbladder occurs more frequently in LC compared with OC; furthermore, spilled stones are arguably better visualized and more readily retrieved during open operations.

In a large retrospective review of more than 10,000 LCs, Schafer and colleagues reported a 6% incidence of gallbladder perforation with complications from dropped stones in 0.08% (Schafer et al, 1998). Furthermore, a 3-year prospective study by Rice and colleagues (1997) of 1059 patients who underwent LC at the Mayo Clinic revealed a perforation rate of 29% with an 11% dropped-stone rate. In this study, 2% of patients with perforated gallbladders developed subhepatic abscesses, and patients with intact gallbladders extracted had abscesses (Rice et al, 1997). In experimental studies using rabbit, rat, and dog models, the intraperitoneal introduction of gallstones resulted in a predominantly benign course without long-term complications (Welch et al, 1991; Sax & Adams, 1993; Cline et al, 1994; Cohen et al, 1994; Johnston et al, 1994; Zisman et al, 1995; Tzardis et al, 1996). Therefore, when gallbladder perforation and dropped stones are encountered, efforts should be made to retrieve stones with suctioning or forceps, and the subhepatic fossa should be copiously irrigated. Conversion to an open procedure is not necessary owing to a low rate of complications; however, it is a good policy to document the event and to inform the patient that stone spillage occurred.

Insufficient Cholecystectomy

In patients with severe acute inflamed cholecystitis, visualization of the cystic duct can be difficult, and historically this was treated with subtotal cholecystectomy. This approach has been proven to be effective and safe in open procedures. Recent reports suggest that when a critical view is impossible to obtain, laparoscopic subtotal cholecystectomy is also relatively safe (Hobbs et al, 2006; Ji et al, 2006; Sharp et al, 2009). When the triangle of Calot cannot be safely dissected, transection and oversewing of the gallbladder neck with resection of the anterior wall of the gallbladder, leaving a small strip of posterior gallbladder wall, can be an option.

Although this is a viable albeit rare approach, PCPs requiring an invasive reintervention still occur (Pernice & Andreoli, 2009). In a study from the United Kingdom of 26 cases of laparoscopic subtotal cholecystectomy over a 3-year period, five patients underwent postoperative ERCP for persistent biliary leak (n = 4) or retained common bile duct stones (n = 1). One patient developed a subphrenic abscess and underwent reoperative laparotomy, and another patient who was critically ill before surgery died postoperatively. A completion LC was required for one patient with a gallstone in a retained pouch, and two patients developed port-site hernias (Philips et al, 2008). In cases mandating laparoscopic subtotal cholecystectomy, the procedure must be performed by experienced surgeons, a drain should be left at the level of transection, and if a posterior wall is retained, it should be coagulated. A late manifestation of “partial” cholecystectomy is a remnant gallbladder pouch with potential for retained stones or cholecystitis.

Infections

Postoperative infection after cholecystectomy is a rare event. In a 7-year study conducted by the Centers for Disease Control and Prevention, out of 54,504 patients, the rate of surgical site infections (SSIs) was significantly lower in the laparoscopic approach when compared with open surgery (0.62% vs 1.82%, P = .001); however, the pathogens that caused SSIs were similar in both groups (Richards et al, 2003). The pathogens identified included Enterobacter species, Escherichia coli, and Staphylococcus aureus. The majority of infections in the open approach were seen in superficial spaces; in the laparoscopic approach, the majority of infections were intraabdominal. As expected, the SSI rates were higher in patients taken to the operating room emergently or with an ASA of 3 or higher (Richards et al, 2003). That said, prophylactic antibiotics given preoperatively to any low-risk patient undergoing elective LC are not indicated as evidenced by several reported studies (Chang et al, 2006; Tocchi et al, 2000; Uludag et al, 2009).

Late Postoperative Complications

Months to years after undergoing a cholecystectomy, patients may be seen with abdominal pain that differs from the symptoms felt before surgery. The incidence of pain from abdominal incisions is higher in OC (9%) versus LC (5%) over a 6-month period as reported by Vander Velpen and colleagues (1993). Bile duct neuromas have also been reported as a cause of pain up to 45 years after cholecystectomy (Paquette et al, 2009). A randomized controlled study performed by Halm and colleagues with 1-year follow-up in the prelaparoscopic era demonstrated that incisional hernias complicated 2% (1 of 60) of patients undergoing OC with a transverse incision compared with 14% (9 of 63) with a midline incision (Halm et al, 2009). Muhe (1992) reported that 12% of patients developed incisional hernias or pain after OC compared with 2% after LC.

Mechanical Causes of Postcholecystectomy Problems

Common causes of mechanical obstruction of the biliary tree after cholecystectomy include benign or malignant strictures, retained stones in the common or cystic ducts, or downstream ampullary sphincter dysfunction.

Strictures (See Chapter 42A, Chapter 42B )

Benign stenosis of the CBD is more common after LC, and 95% of the time, it is related to iatrogenic injury in the form of partial or total sectioning, clipping, or ligation (Kassab et al, 2006). The incidence of patients developing strictures after LC varies from 0% to 2.7% compared with 0.2% to 0.5% after OC (Deziel et al, 1993; Strasberg et al, 1996). Postsurgical benign strictures may also result from delayed thermal injury or intraoperative ischemic devascularization (Genest et al, 1986; Deziel et al, 1993). Additionally, choledochoduodenal fistula formation tends to manifest more commonly after such stricture formation. In the postoperative period, the problems caused by strictures may result in abdominal pain, fever, and jaundice. Cholestasis may lead to choledocholithiasis and recurrent cholangitis (Kassab et al, 2006). Malignant strictures after cholecystectomy should also be considered, as rare cases have been reported (Sharma et al, 2008). This indicates a misdiagnosis prior to the cholecystectomy.

Biliary strictures have historically been treated by surgical reconstruction via hepaticojejunostomy, although many studies have recently reported the safety and efficacy of endoscopic balloon dilation and/or stenting as a noninvasive method to treat such problems (Kassab et al, 2006; Gouma, 2007). Surgery is therefore reserved for major bile duct injuries or failure of endoscopic therapy. A more detailed discussion of both benign and malignant strictures can be found in Chapter 42A, Chapter 42B, Chapter 50A, Chapter 50B, Chapter 50C, Chapter 50D .

Retained Stones

The remnant of the cystic duct or gallbladder (in subtotal cholecystectomy) has historically been implicated as the source of pain, nausea, and vomiting in postcholecystectomy patients (Bodvall, 1973). Several theories as to the etiology of such symptoms, characterized as the cystic duct stump syndrome, have been hypothesized (Garlock & Hurwitt, 1951). An increase in choledochal pressure resulting in cystic stump distension, inflammation or stone obstruction within the remnant of the cystic duct or gallbladder, and an increase in the sphincter of Oddi pressure have all served as causes of postcholecystectomy problems (Bodvall, 1973). However, various studies have confirmed that symptomatic improvement only occurs when a stone is present in the CBD or cystic duct and is subsequently removed endoscopically or via operative reintervention (Hopkins et al, 1979; Mergener et al, 1999; Tantia et al, 2008). In general, persistent symptoms following a cholecystectomy in which no cholangiogram was performed warrants analysis of the liver function profile and/or noninvasive imaging with either ultrasound or MRCP to assess for retained stones. If CBD stones are present, therapeutic ERCP is suggested (Fig. 38.2). The comprehensive management of common bile duct stones is discussed in Chapters 35 through 37.

FIGURE 38.2 Depiction of a stone retained in the cystic duct stump.

Papillary Disorders

The apparatus responsible for directing the flow of biliary and pancreatic secretions is the sphincter of Oddi, which consists of three segments of smooth muscle: 1) the CBD segment, which is about 10 mm in length; 2) the pancreatic segment, which is roughly 6 mm in length; and 3) the segment of the confluence of both the bile duct and pancreatic duct, which is intraduodenal and close to 6 mm in length (Bistritz & Bain, 2006). When constricted, this sphincter impairs forward flow of both bile and pancreatic juices.

Sphincter of Oddi dysfunction (SOD) continues to be a diagnostic dilemma, and its management is controversial. Many entities have been reported describing this phenomenon, including papillary stenosis, sclerosing papillitis, and biliary spasm. The pathogenesis of this disorder is incompletely understood but is thought to result from an increase in basal sphincter pressure resulting in an increase in CBD pressure and stasis from obstructed biliary and pancreatic flow (Funch-Jensen et al, 2006). Microlithiasis causing transient obstruction has also been implicated as a result of stasis in the CBD from sphincter dysfunction, but this has been shown in several studies to be of little consequence in postcholecystectomy pain (Quallich et al, 2002; Rashdan et al, 2003; Bistritz & Bain, 2006). Uncoordinated spasm of the sphincter of Oddi has also been shown to produce the classic symptoms of RUQ colic with elevated liver function tests (LFTs) and has been characterized as biliary dyskinesia (Chuttani & Carr-Locke, 1993), therefore SOD may be described as two separate mechanisms: stenosis and dyskinesia.

Sphincter of Oddi Stenosis

Sphincter of Oddi stenosis refers to a fixed constriction or narrowing of part or all of the anatomic structures of the sphincter of Oddi. The stenosis may result from the trauma of recurrent passing gallstones, repeated attacks of pancreatitis, the effects of iatrogenic instrumentation, or other nonspecific causes. These insults result in fibrotic changes that cause a noncompliant orifice and elevated resting pressures, correlating to symptoms that fall into the category of type I biliary SOD (Bistritz & Bain, 2006). Ampullary biopsies of 43% of patients with SOD show evidence of fibrosis and inflammation (Ponchon et al, 1995). In the postcholecystectomy patient, the resulting backpressure of “papillary stenosis” is compounded by the lack of a gallbladder, which could normally serve as a reservoir for increased pressure in the CBD (Bistritz & Bain, 2006).

Sphincter of Oddi Dyskinesia

Uncoordinated contraction and relaxation of the sphincter of Oddi results in transient obstruction of biliary and/or pancreatic secretions. This leads to an elevation of intraluminal pressure with a concurrent elevation of LFTs. An increase in frequency of phasic contractions and a paradoxical response to the administration of cholecystokinin (failure of relaxation) may also occur in patients with dyskinesia (Tanaka, 2002). Interestingly, there is a significant overlap in patients with biliary dyskinesia and other intestinal motility disorders such as irritable bowel syndrome or hypertensive lower esophageal sphincter disorder (Evans et al, 1995, 1997; Chan et al, 1997).

Clinically, SOD presents in 1% of patients after cholecystectomy and in 14% to 23% of patients presenting with the postcholecystectomy syndrome (Bar-Meir et al, 1984; Meshkinpour & Mollot, 1992; Drossman et al, 1993). SOD can also manifest as recurrent pancreatitis or with recurrent acalculous RUQ pain in patients with an intact gallbladder. Patients with SOD may be classified into three types based on presentation, laboratory results, and ERCP findings. Specifically, two classification systems, shown in Tables 38.3 and 38.4, stratify patients into three clinical groups for both biliary and pancreatic symptoms and predict the outcomes of endoscopic versus surgical treatment (Hogan & Geenen, 1988; Sherman et al, 1991). Patients with type I disease have biliary pain, elevated LFTs, an increase in the diameter of the CBD (>12 mm) with a delay in contrast drainage of more than 45 minutes. Patients with type II disease present with biliary pain and one or two of the remaining criteria delineated above. Patients with type III disease are seen initially with the sole criteria of biliary-type pain (Hogan & Geenen, 1988).

When patients present with the constellation of symptoms that fall under SOD, including pain that lasts at least 30 minutes, other organic causes of RUQ pain must be ruled out with laboratory tests that include complete blood counts and LFTs with amylase and lipase measurements. Transabdominal or endoscopic ultrasonography along with nuclear hepatobiliary scans and cholangiopancreatography may aid in narrowing the diagnostic differential. Often evidence of a dilated common bile duct is seen in the setting of type I SOD and is most amenable to treatment with sphincterotomy (Rolny et al, 1993; Sugawa et al, 2001). Although no specific test is available to assess for SOD, ampullary manometry may be utilized to define hypertensive sphincters (>40 mm Hg) or to detect an increase in the frequency of phasic contractions as well as a paradoxical response to cholecystokinin (Geenen et al, 1989; Thune et al, 1991; Smithline et al, 1993). A further discussion of the diagnostic tools and management strategies used for SOD ensues later in this chapter.

Ultrasonography (See Chapter 13)

The first imaging modality used to evaluate patients with RUQ pain is often ultrasonography, because it is inexpensive, quick, and noninvasive; however, it is highly operator dependent. With experienced technicians, ultrasonography can be used to assess for retained stones and CBD diameter and, less commonly, for sphincter of Oddi dysfunction (Funch-Jensen et al, 2006). In the early postoperative period, transabdominal ultrasonography (TUS) is particularly useful in identifying fluid collections such as bilomas, abscesses, or hemorrhage. If fluid collections are large, ultrasound-guided aspiration and culture should be performed; if the character of the collection is bilious or purulent, drainage catheters are left in place. Bile duct imaging with TUS is difficult, and the sensitivity of ultrasonography to detect stones in the distal CBD is low (Dewbury & Smith, 1983; Filip et al, 2009). Visualizing the pancreatic duct is also difficult with ultrasonography because of overlying gas from the stomach or intestines, which often obscures the acoustic windows.

The use of TUS in the detection of SOD has also been investigated. Measurements of the CBD (upper limits of normal <8 to 10 mm) can be taken after the infusion of cholecystokinin or 45 minutes after the ingestion of a fatty meal, which in the face of distal obstructive physiology, such as that of SOD, will demonstrate dilation of the diameter of the CBD over baseline (Rosenblatt et al, 2001). These diagnostic tools have not gained popularity in the assessment of SOD because of low sensitivity rates and low reproducibility (Simeone et al, 1982; Darweesh et al, 1988; Rosenblatt et al, 2001).

Endoscopic ultrasonography (EUS) is another alternative to more accurately assess the presence of CBD stones and has the ability to better visualize the stomach, duodenum, and pancreas to rule out other organic causes of postcholecystectomy syndrome (see Chapter 14). EUS is also useful in the diagnosis of chronic pancreatitis and in the detection and staging of pancreatic, ampullary, and bile duct carcinoma. In patients with suspected choledocholithiasis, EUS may also be used prior to more invasive testing, such as ERCP. In EUS the ampulla itself is not cannulated, and although not therapeutic, this method has lower complication and failure rates. Additionally, the initial use of EUS may obviate the need for ERCP in one half to two thirds of patients (Filip et al, 2009; Petrov & Savides, 2009). Limitations of EUS include the need for sedation and limited availability, and it may not be conclusive in the presence of duodenal stenosis and previous sphincterotomy and/or biliary stenting in which pneumobilia may obscure a clear view (Stewart et al, 2001). Therefore patients with an elevated serum bilirubin, with or without an elevation of alkaline phosphatase, and a CBD measurement greater than 8 to 10 mm on TUS may be candidates for EUS which, if results are negative for stones or other pathology, may obviate the need for further invasive testing such as with ERCP, thereby decreasing the risk of radiation exposure, postprocedural pancreatitis, and postsphincterotomy bleeding or perforation.

Cholangiopancreatography (See Chapter 18)

Cholangiopancreatography provides direct visualization of the biliary tree, papilla, and pancreatic duct and is highly sensitive and specific in diagnosing the causes of PCPs. The use of magnetic resonance cholangiopancreatography (MRCP; see Chapter 17) provides a noninvasive method to evaluate various biliary and pancreatic disease processes including obstructive stones. Although there is no therapeutic value to MRCP, patients with abnormal LFTs and dilated CBDs (>10 mm) after cholecystectomy with no evidence of stones or other pathology on TUS may be candidates for MRCP (Terhaar et al, 2005). MRCP has been reported to be 95% to 100% sensitive and 88% to 97% specific in detecting biliary obstructions, although it is less sensitive in detecting stones less than 6 mm in size (Terhaar et al, 2005; Tse et al, 2006).

MRCP with secretin (MRCP-S) allows for functional testing of the pancreatic duct (Mariani et al, 2003). Long-term results of MRCP-S reveal diagnostic accuracy comparable to that of ERCP and with excellent positive predictive value; however, when the test showed abnormalities, radiologists were unable to distinguish between the biliary and the pancreatic segment dysfunction of the sphincter of Oddi. Additionally, the negative predictive value of MRCP-S was poor at 64% (Testoni et al, 2008). MRCP and EUS are diagnostic tools that may be used in patients with abnormal but inconclusive first-line testing (laboratory values and TUS) to obviate the need for further invasive options. The gold standard diagnostic and therapeutic procedure in patients with biliary obstruction is ERCP. It carries a sensitivity and specificity of more than 95% in the detection of obstruction and, where pathology is seen, it may also be therapeutic, allowing for sphincterotomy, stent placement, and tissue collection (Snady et al, 1992; Palazzo et al, 1995; Prat et al, 1996; Buscarini et al, 2003). However, ERCP carries a significant risk of complications. Acute pancreatitis is the most common complication and occurs in 5% to 40% of patients. Additionally, pancreatic necrosis, duodenal or biliary tree perforation, multiorgan failure, and death may occur, albeit less than 1% of the time (Dancygier & Nattermann, 1994; Masci et al, 2001; Barthet et al, 2002; Lieb & Draganov, 2007).

In patients with postcholecystectomy pain where SOD is suspected, ERCP can also allow for concurrent sphincter of Oddi manometry (SOM), which is considered the gold standard for detection of SOD (Khashab et al, 2009). A triple-lumen catheter connected to external transducers is positioned in the sphincter of Oddi segment of both the CBD and pancreatic duct separately, and baseline pressure and phasic wave amplitude, duration, and frequencies are measured with video recording for subsequent analysis (Csendes et al, 1979; Geenen et al, 1980). SOD is a dynamic process, and a single, normal endoscopic evaluation may not be sufficient in patients with persistent symptoms (Varadarajulu et al, 2003; Khashab et al, 2009). In a study of 5352 patients who underwent SOM over a 13-year period, 1037 had SOM readings within normal limits (Table 38.5). Of these patients, 30 had repeat ERCP for persistent symptoms, and 60% of these were given the diagnosis of SOD (Khashab et al, 2009).

The most common cause of abdominal pain occurring after cholecystectomy is residual or recurrent choledocholithiasis (see Chapter 35), seen in 42% of patients undergoing ERCP in one study of more than 1000 patients with PCPs (Tondelli & Gyr, 1983; Zhou et al, 2003). ERCP findings of biliary or pancreatic strictures are second to stones in frequency in patients with PCPs (Goenka et al, 1996; Singh et al, 1996). Furthermore, in various studies in which ERCP was performed on patients with severe PCPs manifesting as pain and/or jaundice, the diagnosis was made in over half of the patients; CBD stones comprised the majority (Ruddell et al, 1980; Hamilton et al, 1982; Carlson et al, 1992).

As noted above, bile leak from CBD injury or inadequate cystic duct stump ligation are serious complications of cholecystectomy. In this scenario, intervention via ERCP with the use of endoprosthetic stents with or without sphincterotomy is an important diagnostic and therapeutic tool (Katsinelos et al, 2006). In some cases, endoscopic access to the biliary tree is limited, such as in patients who have had diverting gastric bypass surgery, and percutaneous transhepatic cholangiography (PTC) is an alternative approach. However, a majority of patients with biliary injuries following cholecystectomy may be successfully managed initially with ultrasound or computed tomography (CT) guided percutaneous drainage of biliary collections. Patients with persistent leaks or those who present with jaundice should be considered for ERCP as a first-line diagnostic and therapeutic option (Zerem & Omerovic, 2009).

Hepatobiliary Scintigraphy (See Chapter 15)

In patients who have undergone cholecystectomy, nuclear scanning reveals rapid flow of intravenously administered ^99mTc-n-(2,6,dimethylphenylcarbamoylmethyl) iminodiacetic acid (^99mTc-HIDA) from the hepatocytes to the biliary canaliculi then to the CBD and ultimately to the duodenum via the sphincter of Oddi. In patients with SOD a marked delay in transpapillary transit times is seen with stasis in the intrahepatic and extrahepatic biliary system. This sort of quantitative cholescintigraphy may aid in the diagnosis of patients suspected to have SOD following cholecystectomy (Shaffer et al, 1986; Corazziari et al, 1994; Madacsy et al, 1999; Corazziari et al, 2003). It is also useful in confirming the presence of a biliary leak after cholecystectomy, although discrimination of the precise location is often not possible.

Axial Imaging

If the aforementioned techniques do not reveal the cause of PCPs, CT or magnetic resonance imaging (MRI) can be employed to rule out other sources of pain not suspected preoperatively (e.g. tumors, rib fractures, pneumonia). Postoperative complications, such as dropped stones, abscesses, hematomas, or hernias can also be detected. A scan that is inconclusive is often reassuring to the surgeon, as it can at least define that postoperative complaints are not obviously organic in nature, which can lead the workup of symptoms in other directions.

Early Postcholecystectomy Problems

Once the appropriate diagnostic workup is performed, various treatment strategies exist to address common PCPs. In the early days to weeks after operation, the finding of a gallbladder fossa hematoma (relatively common) should be managed with serial hematocrit values and correction of any coagulopathy. Most hematomas are asymptomatic and self-limited; however, if a patient’s anemia worsens and impacts their clinical status, operative reexploration must be pursued. If an abscess is identified on diagnostic ultrasound or CT scan, percutaneous drainage is the preferred treatment, if the abscess is large enough, and if the procedure is technically feasible. Smaller or inconveniently placed collections may be successfully managed with antibiotics alone, and operative drainage is rarely necessary.

In the scenario of a biliary leak presenting as a biloma, the initial management should be aimed at percutaneous drainage to control local sepsis; however, endoscopic management may ultimately be necessary. In minor injuries, ERCP and sphincterotomy will eliminate the transpapillary pressure gradient, allowing for uninhibited flow across the papilla, thereby diminishing the extent of the leak, until it eventually ceases (De Palma et al, 2002). The endobiliary stent may also seal off the flow of bile through a physical apposition against the defect in the biliary tree, although this is less likely. External drainage of bile usually dissipates immediately, within a few days; the stent may be removed a month later, if the cholangiogram shows resolution of the leak. If external drainage does not resolve, or if it recurs in the early period, the next approach would be the serial placement of multiple endobiliary stents in a “bunched” fashion, or even deployment of a temporary covered metal stent. Should these maneuvers fail, operative repair is required and usually calls for a bilioenteric bypass. Major damage to the biliary tree can usually be salvaged by stents, but massive bile ascites causing generalized peritonitis may require an operative washout and drainage; this can sometimes be achieved laparoscopically, realizing that an open approach may ultimately be required to definitively address the damage.

Late Postcholecystectomy Problems

When patients come to the hospital months to years after having a cholecystectomy with symptoms of PCPs, a complete laboratory and diagnostic workup will guide the surgeon’s management decisions. In the case of abnormal LFTs, with or without leukocytosis, and abnormal TUS findings, the patient should proceed directly to ERCP. If, however, a postcholecystectomy patient’s LFTs are abnormal, but the TUS is equivocal or normal, it is reasonable to proceed with EUS or MRCP prior to ERCP. The various endoscopic management strategies regarding choledocholithiasis, strictures, and fistulae are discussed elsewhere in this textbook (see Chapter 35, Chapter 42A, Chapter 42B ).

A diagnostic workup that points toward the diagnosis of SOD will alter the physician’s management strategy. The goal for treatment in patients with SOD is free flow of biliary and pancreatic fluid into the duodenum. This objective may be achieved medically, endoscopically, or surgically.

Medical treatment of SOD is often attempted as a first-line management option, but results are usually poor. The utility of calcium channel blockers and oral nitrates have been plagued with poor outcomes secondary to tachyphylaxis and side effects of the medications (Staritz et al, 1985; Fullarton et al, 1992; Khuroo et al, 1992; Sand et al, 1993; Craig & Toouli, 2002; Wu et al, 2005b; Bistritz & Bain, 2006). Although controversial and underexamined, some studies reveal a decrease in sphincter of Oddi basal pressures with the use of intravenous somatostatin and its analogues (Fazel et al, 2002; Wu et al, 2005a).

Endoscopic treatment of SOD utilizes the ability to decrease transpapillary pressures with sphincterotomy. Patients with a functional obstruction resulting in SOD, as seen in type I disease in particular, benefit from sphincterotomy even when manometry may not reveal hypertension. Symptomatic relief has been achieved at more than 2-year follow-up in patients with type I SOD with or without manometric findings of hypertension (Rolny et al, 1993; Sugawa et al, 2001). Based on these and other findings that corroborate these results, sphincterotomy without manometry is advised in all patients with type I SOD. In contrast, patients with type II SOD only benefit from sphincterotomy when basal sphincter pressures are elevated. Therefore, manometry should precede endoscopy in this patient population (Geenen et al, 1989; Toouli & Craig, 1999). In patients without objective evidence of biliary obstruction (type III), the response to sphincterotomy does not correlate well with manometric findings, thus it has been suggested that patients who carry a diagnosis of type III SOD should undergo hepatobiliary scintigraphy to gather additional objective data prior to invasive manometry or sphincterotomy (Wehrmann et al, 1996). In this patient population, botulinum toxin may also be used to avoid sphincterotomy and its resultant complications such as bleeding, pancreatitis, and perforated viscera (Wehrmann et al, 1998). Recent studies suggest that phosphodiesterase type 5 inhibitors such as vardenafil (Levitra) infused into the duodenum with endoscopy may reduce basal sphincter of Oddi pressures without significant adverse events (Cheon et al, 2009). These and other agents are under active investigation as alternatives to the more invasive approach of sphincterotomy.

Endoscopic stenting for SOD in patients without an elevated basal sphincter pressure has been attempted with poor response and a high associated risk of stent-induced pancreatitis (Goff, 1995). Additionally, stent placement has also been advocated to predict which patients would respond to sphincterotomy; although in some studies, these trials were able to detect a population of patients who would respond, this method did not gain popularity because of the risks involved and the lack of compelling evidence (Bistritz & Bain, 2006). Therefore the use of biliary stenting in the setting of SOD is not advisable.

Surgical intervention for SOD was developed before the advent of ERCP (Madura et al, 2005). Transduodenal sphincteroplasty with transampullary septectomy (TDS-TAS) was the procedure of choice at that time (Fig. 38.3). Prior to the advent of ERCP, no objective studies could accurately diagnose patients with SOD; subjective intraoperative methods, such as palpation of the sphincter through the wall of the duodenum, were used to select patients for TDS-TAS. As time progressed, various studies were developed to improve patient selection, such as the morphine–neostigmine evocative test (Nardi & Acosta, 1966). Expertise in endoscopy also continued to progress, until endoscopic sphincterotomies were standardized by the mid-1970s (Kawai et al, 1974). Advantages of the surgical approach include accurate apposition of the duodenal and ductal mucosa, as well as access to the transampullary septum, which cannot always be accomplished with ERCP (Madura et al, 2005). Endoscopic transampullary septotomy is rare, and drainage of the pancreatic duct is inadequate (Fuji et al, 1989; Rolny et al, 1989). In a series of 17 patients, pain from an unsuccessful sphincteroplasty was relieved by excision of the septum in 12 patients (Moody et al, 1990). These studies and others demonstrate the importance of a septotomy; however, both surgical and endoscopic results are not optimal owing to the vague nature of this disease (Tables 38.6 and 38.7). Patients with a suspected diagnosis of SOD should be treated by experienced surgeons and endoscopists working in concert. A treatment algorithm for patients presenting with PCP is illustrated in Figure 38.4.

FIGURE 38.3 Transduodenal sphincteroplasty. Depiction of transampullary septectomy.

FIGURE 38.4 Treatment algorithm for patients with postcholecystectomy problems.