Management of intrahepatic stones: The role of subcutaneous hepaticojejunal access loop. A prospective cohort study
Executive Summary
Intrahepatic stone disease is a complex condition characterized by high rates of stone recurrence and residual calculi even after surgical intervention. Traditional management strategies, such as hepaticocutaneousjejunostomy (HCJ) or percutaneous transhepatic cholangioscopic lithotripsy (PTCSL), often involve the significant morbidity of permanent biliary stomas or temporary, painful transhepatic tracts.
This briefing outlines a prospective cohort study evaluating a "closed" subcutaneous hepaticojejunal access loop. This technique provides a permanent, reusable, and stoma-free route to the biliary tree. The study, involving 42 patients, demonstrates that this approach allows for successful stone clearance in 75% of patients requiring re-intervention, utilizing standard endoscopy without specific complications related to the loop's construction. While highly effective for most, its success is limited by the presence of severe biliary strictures.
Disease Overview and Pathogenesis
Intrahepatic stones are defined as calculi located proximal to the confluence of the right and left hepatic ducts.
Epidemiology: The disease is prevalent in East and Southeast Asia but infrequent in Western populations.
Composition: Stones primarily consist of calcium bilirubinate (brown pigment stones), though they often contain more cholesterol than common bile duct or gallbladder stones.
Etiology: pathogenetic factors include:
Recurrent bacterial infections (e.g., E. coli, Klebsiella, Bacteroides).
Parasitic infestations (Clonorchis sinensis or Ascaris lumbricoides).
Biliary stasis due to congenital abnormalities or iatrogenic strictures.
Clinical Presentation: Patients typically present with the triad of fever, jaundice, and right upper quadrant pain (present in 60% of cases). The disease can progress to recurrent cholangitis, liver atrophy, secondary biliary cirrhosis, and epithelial dysplasia or cholangiocarcinoma (3%–8% of cases).
Limitations of Conventional Management
Current surgical and radiological approaches to intrahepatic stones face significant challenges:
The Subcutaneous Access Loop Technique
The subcutaneous hepaticojejunal access loop was developed to provide long-term biliary access while avoiding the complications of a stoma.
Surgical Construction
Exploration: Cholecystectomy and bile duct exploration are performed. Stones are cleared using forceps, saline flushing, and intraoperative flexible choledochoscopy.
Anastomosis: A side-to-side hepaticojejunostomy is created between the hepatic duct confluence and a 50-cm jejunal Roux-en-Y loop.
Subcutaneous Fixation: The closed proximal limb of the jejunal loop (approximately 12 cm from the anastomosis) is passed through the anterior abdominal wall and fixed in a subcutaneous position.
Marking: Ligaclips are used to mark the anastomosis and the access loop for future radiological identification.
Postoperative Intervention Procedure
When residual or recurrent stones are identified via ultrasonography or MRCP, the loop is accessed:
Access: A small skin incision is made over the scar to visualize the subcutaneous jejunal loop.
Endoscopy: A conventional forward-viewing esophagogastroscope or choledochoscope is passed through the loop to the hepaticojejunostomy.
Stone Extraction: Under fluoroscopic guidance, Dormia baskets, extraction balloons, or mechanical lithotripters are used to clear calculi.
Stricture Management: Strictures are dilated using angioplasty balloons for approximately 10 minutes.
Clinical Study Results
A prospective cohort study (January 2009 – January 2013) at the University of Alexandria analyzed 42 patients (17 males, 25 females; mean age 41).
Preoperative Patient Profile
Stone Distribution: 60% Left lobe; 33% Bilobar; 7% Right lobe.
Comorbidities: 79% had associated extrahepatic stones; 52% had intrahepatic duct strictures; 12% had liver atrophy.
Bile Culture: 93% positive (most common: E. coli 38%).
Operative and Postoperative Outcomes
Mean Operation Time: 4.9 hours.
Mean Hospital Stay: 10 days.
Complications: 19% overall minor complication rate. The most common was wound infection (12%).
Recurrence: Recurrent cholangitis occurred in 52% of patients (mean period: 10 months post-op), always associated with recurrent stones.
Effectiveness of the Access Loop
Of the 42 patients, 28 (67%) required use of the access loop for residual or recurrent stones.
Critical Factors Influencing Success
The presence and severity of biliary strictures are the primary determinants of successful stone clearance via the access loop.
No Stricture (20 patients): 95% complete stone removal rate.
Mild Stricture (18 patients): 89% complete removal rate after endoscopic dilatation.
Severe Stricture (4 patients): 0% complete removal rate. In these cases, guidewires could not pass through the strictures, necessitating hepatic resection.
Conclusion
The subcutaneous hepaticojejunal access loop represents a significant advancement in the management of intrahepatic stone disease. It offers a permanent, re-usable access route that utilizes standard endoscopic equipment without the morbidity of biliary-cutaneous fistulas or transhepatic access. While the technique is highly effective for patients with mild or no strictures, patients with severe biliary strictures may require alternative approaches, such as hepatic resection. For the "no need" group, the loop remains a valuable preventative measure for potential future stone recurrence.
