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R J Fitzgibbons

Publications and source records attributed to R J Fitzgibbons.

At least 19 recordsLinked to original sources

Laparoscopic surgery and the common bile duct.

Many biliary tract surgeons have now reached a level of sophistication with laparoscopic cholecystectomy that they are now able to deal with the common bile duct at the same time. Preoperative endoscopic cholangiography can be reserved for cases where choledocholithiasis has a high degree of probability. This has served to decrease the number of negative studies. The surgeon has five choices regarding stones confirmed by operative cholangiography during laparoscopic cholecystectomy: (1) do nothing, hoping the stones will pass spontaneously or that a postoperative sphincterotomy with stone extraction will be successful; (2) perform a transcystic laparoscopic common bile duct exploration (best for stones less than 1 cm and distal to the cystic duct); (3) perform a laparoscopic common bile duct exploration by choledochotomy (best for large stones in patients with common bile ducts greater than 1 cm. It is also the preferred approach with stones proximal to the insertion of the cystic duct.); (4) perform an intraoperative sphincterotomy with stone extraction, either retrograde or antegrade (this approach has some proponents but has not gained popularity among the majority of surgeons); and (5) place a double lumen catheter through the cystic duct with a proximal lumen in the common bile duct and the distal lumen in the duodenum. This can be used for serial postoperative cholangiography to confirm spontaneous stone passage or falsely positive operative cholangiograms. It is useful in situations when laparoscopic common bile duct exploration equipment or surgeon expertise is not available. If stones persist, a guidewire can be introduced through the distal lumen of the catheter for a guidewire-assisted sphincterotomy. Other CBD interventions that have been reported include laparoscopic biliary bypass and resection of choledochal cysts. Malignant lesions should not be approached by a laparoscopic method except in unusual circumstances.

Biliary Tract Surgical Procedures↗

Outcomes assessment and minimally invasive surgery: historical perspective and future directions.

BACKGROUND: Outcomes assessment is being used increasingly to shape practice patterns in all areas of medicine. Although outcomes assessment is not a new concept, the widespread application of outcomes measurement for modifying practice is novel. Instead of focusing on results of interventions in highly controlled environments, outcomes studies usually report results as they occur in uncontrolled, real-world environments. Recently, the Society of American Gastrointestinal Endoscopic Surgeons (SAGES) has initiated a society-wide initiative to monitor outcomes in patients undergoing various laparoscopic operations. METHODS: Pertinent literature is reviewed as it relates to outcomes assessment. The historical background underpinning the modern interest in outcomes is outlined. Definitions of terms useful for understanding outcomes research are given. The impact of outcomes assessment on minimally invasive surgery, both positive and negative, are examined. The SAGES outcome initiative is introduced. CONCLUSIONS: Although outcomes studies usually do not provide information on the causes of observations made, they have gained in popularity because they provide information about patient perceptions of disease, disability, and treatment. Minimally invasive surgical procedures often are reported in terms of outcomes assessment because a controlled clinical trial was rendered impossible by early and widespread application of laparoscopic surgery. The SAGES outcomes initiative will provide the necessary tools for the participation of surgeons in the process of practice profiling.

Forecasting↗

Laparoscopic repair of recurrent hernias.

BACKGROUND: Recurrence after primary conventional inguinal herniorrhaphy occurs in approximately 10% of patients depending on the type of repair and expertise of the surgeon. The repair of the resulting recurrent hernia is a daunting task because of already weakened tissues and obscured and distorted anatomy. The failure rate of these repairs using an open anterior approach may reach as high as 36%. Because of such a high failure rate, a number of investigators have focused on repairing these difficult recurrent hernias laparoscopically using a tension-free approach. Some of the earlier reports suggested a low recurrence rate of 0.5% to 5% when a laparoscopic approach was used to repair these hernias. The purpose of this study was to evaluate the efficacy of laparoscopic treatment for recurrent hernias in our institutions. METHODS: Between February 1991 and February 1995, 96 recurrent hernias were repaired in 85 patients (78 men and 7 women). There were 48 right, 26 left, and 11 bilateral hernias. The mean age of the patients was 59 years (range, 18-86 years); the mean height was 69 in. (range, 54-77 in.); and the mean weight was 176 pounds (range, 109-280 pounds). A total of 68 herniorrhaphies were performed using the transabdominal preperitoneal (TAPP) method: 19 using intraperitoneal on-lay mesh (IPOM) repair and 8 using the total extraperitoneal (TEP) method. The method of repair in one patient was not recorded. The mean operating time was 76 min (range, 47-172 min). Thirteen patients underwent additional procedures. RESULTS: Long-term follow-up was performed by questionnaire, examination, or both in 76 patients (85 hernias). Median follow-up time was 27 months (range, 2-56 months). There were four recurrences (2 in IPOM and 2 in TAPP). Three of these were repaired laparoscopically and one conventionally. There were 20 minor and 14 major complications and no mortality. One conversion occurred in the TAPP group. Mean postoperative stay was 1.4 days (range, 0-4 days). It was felt by 92% of the patients that their symptoms were completely relieved, whereas 4% of the patients continued to exhibit symptoms for which their hernia was repaired, and 3.6% failed to answer. As reported, 86% of the patients preferred their laparoscopic repair; 1% preferred the conventional repair; and 13% failed to reply. Afterward, 77% of the patients returned to normal activity, and 35% returned to vigorous activity within 4 weeks of surgery. Satisfaction with laparoscopic repair was expressed by 92% of the patients, whereas 8% either were dissatisfied or did not answer. In the end, 95% of the patients stated that they would recommend laparoscopic hernia surgery to their family and friends. CONCLUSIONS: These preliminary data show that laparoscopic repair of recurrent inguinal hernia is a safe alternative procedure with acceptable rates of recurrence and complications.

Adult↗

The outcome of unretrieved gallstones in the peritoneal cavity during laparoscopic cholecystectomy. A prospective analysis.

BACKGROUND: Gallbladder perforation during laparoscopic cholecystectomy (LC) with spillage of bile and gallstones occurs in a substantial number of patients (up to 40%). Most surgeons believe that free intraperitoneal stones are not a justification for conversion to laparotomy even if a large number of stones are left in situ. There are, however, a number of reports demonstrating that, on occasion, these unretrieved gallstones may cause infection or abscess, inflammation, fibrosis, adhesions, cutaneous sinuses, small bowel obstruction, or generalized septicemia. The aim of this study was to determine the outcome of unretrieved gallstones in the peritoneal cavity after gallbladder perforation during LC. METHODS: In a 7-year period between 1989 and 1996, prospective data were maintained on 856 patients who underwent LCs by a single surgeon (R. J.F.). Of the 856 patients, 165 (16%) had gallbladder perforations resulting in lost gallstones in the peritoneal cavity. A concerted attempt was made to remove the lost stones using a variety of extraction devices. Of these 165 patients, 106 (64%) were available for follow-up through mail (76%) and by telephone (24%). The mean age of these patients was 64.9 years (range, 18 to 98 years), and the mean follow-up was 44.8 months (range 4.9 to 92.3 months). RESULTS: Of the 106 patients with unretrieved gallstones, we identified four patients with short-term complications and one patient with a long-term complication. The first patient with a short-term complication had pyrexia for 10 days postoperatively. Diagnostic evaluation, which included computed tomography (CT) scan, failed to reveal any abnormality. The patient was treated conservatively with a course of oral antibiotics. In the second patient, cellulitis developed at a drain site after its removal, which resolved with oral antibiotics. The third patient acquired an umbilical wound abscess, which drained spontaneously, requiring no treatment. A sterile subphrenic collection developed in the fourth patient 1 month postoperatively, which was treated with percutaneous drainage under CT guidance. The only long-term complication was spontaneous erosion of a gallstone from the back of a patient with a questionable history of inflammatory bowel disease 8 months postoperatively. All of the patients made complete recoveries. CONCLUSIONS: In most patients, unretrieved gallstones are of no consequence, but complications occur occasionally. It is therefore advisable to retrieve as many gallstones as possible during LC short of converting to a laparotomy.

Abdominal Abscess↗

The effect of the anastomotic size on gastric emptying after hemigastrectomy with Billroth II reconstruction.

OBJECTIVE: To determine if the size of the gastrojejunal anastomosis after Billroth II reconstruction was the rate-limiting factor in gastric emptying in the postoperative period. METHODS: Twelve mongrel dogs were randomized to have either 1.5 cm or 5 cm gastrojejunal anastomoses prior to Billroth II hemigastrectomy. Each dog had three solid and three liquid radiolabelled emptying studies pre- and postoperatively. Data were collected using a gamma camera. For liquid studies, images were obtained at 0 min, 2 min, 4 min, 6 min, 8 min, 10 min, 20 min, 30 min, 40 min, 50 min and 60 min. For solid studies, images were obtained at 0 min, 5 min, 10 min, 20 min, 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, 110 min and 120 min. Means were compared by analysis of variance using the repeated measures option. RESULTS: Postoperative liquid emptying was significantly faster in the first 10 min with both 1.5 cm and 5 cm anastomoses compared with preoperative scans in the same animals (45% versus 20% and 48% versus 29%, respectively). On the other hand, solid gastric emptying was much slower postoperatively with the 1.5 cm anastomosis compared with preoperative scans (29% versus 65%) as well as compared with postoperative 5 cm anastomosis (29% versus 62%) at the end of 120 min. CONCLUSIONS: Our model suggests that the gastric emptying of solids is affected by the size of the gastrojejunal anastomosis and not by the diameter of the efferent limb of the small intestine following Billroth II reconstruction.

Anastomosis, Surgical↗

Eight years' experience with the use of a transcystic common bile duct duodenal double-lumen catheter for the treatment of choledocholithiasis.

BACKGROUND: We have previously reported an alternative technique for treatment of choledocholithiasis found at laparoscopic cholecystectomy (LC) that can be considered with selected patients. This study was undertaken to update our experience with this alternative technique, which makes serial postoperative cholangiograms possible and facilitates stone extraction by assuring access to the common bile duct so that a guidewire-assisted endoscopic retrograde sphincterotomy can be performed. METHODS: In the period between 1989 and 1997, prospective data were maintained on 1043 consecutive patients who underwent LC by a single surgeon. Fifty-two patients with abnormal cholangiograms were managed with a percutaneously placed double-lumen catheter threaded through the cystic duct and advanced into the duodenum. RESULTS: Five attempts failed, 3 because of failure to pass the catheter and 2 because of catheter dislodgement. Of the 47 remaining patients, 2 underwent intraoperative endoscopic sphincterotomies using this alternative technique and 45 had cholangiograms repeated at 10 to 14 days. Twenty-three had negative cholangiograms, thus avoiding further procedures or unnecessary sphincterotomies because of spontaneous stone passage or initial false-positive cholangiograms. The remaining 22 had positive cholangiograms. Eighteen ultimately underwent sphincterotomies with stone extraction using a guidewire placed through the catheter. The other 4 had negative cholangiograms after serial follow-up, presumably because of spontaneous stone passage. CONCLUSIONS: The use of a transcystic double-lumen catheter passed through the ampulla of Vater is an effective and safe alternative for the management of choledocholithiasis discovered during LC.

Adolescent↗

Hand-assisted laparoscopic surgery (HALS): a useful technique for complex laparoscopic abdominal procedures.

Advanced laparoscopic abdominal surgery is now being performed routinely. However, it can be extremely challenging and time-consuming, and it may be associated with increased intraoperative and postoperative complications, mainly due to the loss of tactile sensation with totally laparoscopic techniques. This article describes a technique of hand-assisted laparoscopic surgery for complex abdominal procedures that allows the surgeon to insert a nondominant hand into the abdominal cavity while preserving the pneumoperitoneum. Use of the hand allows for rapid exploration, methodical dissection, identification of crucial structures, and expeditious performance of a procedure because of the maintenance of the tactile sensation. Our experience with this approach has been favorable.

Abdomen↗

Assessing risks, costs, and benefits of laparoscopic hernia repair.

Laparoscopic inguinal herniorrhaphy (LIHR) was introduced with the following potential advantages: less postoperative discomfort and pain, reduced recovery time that allows earlier return to full activity, easier repair of a recurrent hernia, the ability to treat bilateral hernias concurrently, the performance of a simultaneous diagnostic laparoscopy, ligation of the hernia sac at the highest possible site, improved cosmesis, and decreased incidence of recurrence. Potential disadvantages include complications, such as bowel, bladder, and vascular injuries; potential adhesive complications at sites where the peritoneum has been breached or prosthetic material has been placed; the apparent need, at least at the present, for a general anesthetic; and the increased cost because of expensive equipment needs. Most surgeons agree that LIHR has a role in the management of patients with a recurrent hernia after a conventional inguinal herniorrhaphy (CIHR), bilateral inguinal hernia, or a need for laparoscopy for another procedure, such as laparoscopic cholecystectomy. The routine use of LIHR for the unilateral, uncomplicated hernia is a more contentious issue.

Anesthesia, General↗

Prospectively randomized trial of postoperative adjuvant chemotherapy in patients with high-risk colon cancer.

PURPOSE: This study had two major goals: (1) to assess the effectiveness of a regimen of fluorouracil (5-FU) plus levamisole plus leucovorin as postoperative surgical adjuvant therapy for patients with high-risk colon cancer, and (2) to evaluate 6 months versus 12 months of chemotherapy. PATIENTS AND METHODS: Patients with poor-prognosis stage II or III colon cancer were randomly assigned to receive adjuvant chemotherapy with either intensive-course 5-FU and leucovorin combined with levamisole, or a standard regimen of 5-FU plus levamisole. Patients were also randomly assigned to receive either 12 months or 6 months of chemotherapy, which resulted in four treatment groups. RESULTS: Eight hundred ninety-one of 915 patients entered (97.4%) were eligible. The median follow-up duration is 5.1 years for patients still alive. There was a difference among the four treatment groups with respect to patient survival, and a significant duration-by-regimen interaction was observed. Specifically, standard 5-FU plus levamisole was inferior to 5-FU plus leucovorin plus levamisole when treatment was given for 6 months (5-year survival rate, 60% v 70%; P < .01). CONCLUSION: There was no significant improvement in patient survival when chemotherapy was given for 12 months compared with 6 months. When chemotherapy was given for 6 months, standard 5-FU plus levamisole was associated with inferior patient survival compared with intensive-course 5-FU plus leucovorin plus levamisole. These data suggest that 5-FU plus levamisole for 6 months should not be used in clinical practice, whereas 6 months of treatment with 5-FU plus leucovorin plus levamisole is effective.

Adenocarcinoma↗

Sequential intrahepatic fluorodeoxyuridine and systemic fluorouracil plus leucovorin for the treatment of metastatic colorectal cancer confined to the liver.

PURPOSE: Extrahepatic metastasis represents a frequent pattern of disease progression when fluorodeoxyuridine (FUDR) is given by the intraarterial route for the treatment of unresectable colorectal liver metastases. Systemic fluorouracil (5-FU) plus leucovorin was added to intrahepatic FUDR to prolong the duration of disease control. METHODS: Only patients with colorectal cancer who had evidence of unresectable metastases confined to the liver were eligible. Laparotomy was performed to establish arterial perfusion of the liver. Cycles of intrahepatic FUDR followed by a 1-week rest period then intravenous chemotherapy with 5-FU plus leucovorin were administered until maximal regression of hepatic metastases. Maintenance chemotherapy with 5-FU plus leucovorin was then given until disease progression. RESULTS: Fifty-seven patients entered this trial; four patients (7%) were ineligible and 13 (23%) did not receive any chemotherapy on study because of findings at laparotomy. The 40 eligible patients who began chemotherapy are included in the statistical analyses. Twenty-five patients (62% of those who received chemotherapy) experienced regression of liver metastases. The median time to tumor progression was 9 months, but only 3% remained progression-free at 24 months. The median survival duration was 18 months. Toxicity was tolerable with no cases of biliary sclerosis. One treatment-related fatality due to sepsis was observed. CONCLUSION: Although short-term treatment results appear to be somewhat better than we have previously observed with intrahepatic FUDR alone, the sequential regimen did not have an impact on long-term, progression-free survival in patients with unresectable liver metastases. We are now investigating this regimen as surgical adjuvant therapy in selected patients following hepatic metastasectomy where this aggressive approach might have a greater therapeutic effect in the minimal residual disease setting.

Adult↗

Abnormal cholangiograms during laparoscopic cholecystectomy. Is treatment always necessary?

BACKGROUND: Laparoscopic common bile duct exploration (LCBDE) is more expensive and time consuming than its conventional counterpart. Therefore, it should only be performed when there is near certainty that stones are present. The purpose of this study was to identify patients who should be spared LCBDE despite an abnormal intraoperative cholangiogram. METHODS: Of 700 consecutive laparoscopic cholecystectomies performed between 1989 and 1994 by a single surgeon (R.J.F.), 41 had abnormal intraoperative cholangiograms (6%). All 41 patients were treated by either immediate CBDE (19) (conventional or laparoscopic) or had postoperative follow-up cholangiograms (22). The patients were retrospectively assigned to one of three groups. Group I patients had a single "soft" indicator of choledocholithiasis. Group II patients had one or more of the following: (1) a highly suspicious abnormal intraoperative cholangiogram, (2) two or more "soft" indicators of choledocholithiasis, or (3) preoperative clinical findings such as elevated liver function studies or positive preoperative radiological studies. Group III patients had proven choledocholithiasis. RESULTS: In group I, there were 11 patients, none of whom underwent immediate CBDE. Eight of the 11 (73%) had normal follow-up cholangiograms due to either spontaneous stone passage or a false-positive intraoperative cholangiogram. There were 27 patients in group II; 19 underwent immediate CBDE with 100% stone recovery. The remaining 8 had delayed treatment and in five stones were recovered, while three had normal postoperative cholangiograms suggesting spontaneous stone passage. In group III, all three had negative follow-up cholangiograms despite proven choledocholithiasis. Spontaneous stone passage in this group seemed highly likely. CONCLUSIONS: The finding of a single soft indicator results in a low rate of stone recovery postoperatively, and these patients should not undergo LCBDE. In this series, spontaneous stone passage seemed highly likely in at least 3/22 (14%) and possibly as high as 14/22 (64%).

Catheterization↗

Laparoscopic resection of heterotopic gastric pancreatic tissue.

This report describes a laparoscopic approach for the treatment of a benign gastric mass. A 15-year-old female presented with recurrent epigastric pain. Preoperative endoscopic and x-ray evaluation demonstrated a submucosal tumor of the greater curvature. The patient underwent a laparoscopic resection of a heterotopic pancreatic tumor in the stomach. A description of our technique and a review of the pathophysiologic features of this disease is included.

Adolescent↗

Mechanisms of hernia recurrence after preperitoneal mesh repair. Traditional and laparoscopic.

OBJECTIVE: The authors provide an assessment of mechanisms leading to hernia recurrence after laparoscopic and traditional preperitoneal herniorrhaphy to allow surgeons using either technique to achieve better results. SUMMARY BACKGROUND DATA: The laparoscopic and traditional preperitoneal approaches to hernia repair are analogous in principle and outcome and have experienced a similar evolution over different time frames. The recurrence rate after preperitoneal herniorrhaphy should be low (< 2%) to be considered a viable alternative to the most successful methods of conventional herniorrhaphy. METHODS: Experienced surgeons supply specifics regarding the mechanisms of recurrence and technical measures to avoid hernia recurrence when using the preperitoneal prosthetic repair. Videotapes of laparoscopic herniorrhaphy in 13 patients who subsequently experienced a recurrence also are used to determine technical causes of recurrence. RESULTS: Factors leading to recurrence include surgeon inexperience, inadequate dissection, insufficient prosthesis size, insufficient prosthesis overlap of hernia defects, improper fixation, prosthesis folding or twisting, missed hernias, or mesh lifting secondary to hematoma formation. CONCLUSIONS: The predominant factor in successful preperitoneal hernia repair is adequate dissection with complete exposure and coverage of all potential groin hernia sites. Hematoma mesh lifting and inadequate lateral inferior and medial inferior mesh fixation represent the most common causes of recurrence for surgeons experienced in traditional or laparoscopic preperitoneal hernia repair.

Clinical Protocols↗

A pilot evaluation of alternating preoperative chemotherapy in the management of patients with locoregionally advanced breast carcinoma.

BACKGROUND: This prospective trial was conducted to evaluate the outcome of patients treated with preoperative and post operative chemotherapy, mastectomy, and irradiation for locoregionally advanced breast carcinoma. METHODS: Between June 1986 and September 1990, 71 patients received 2 cycles of doxorubicin that alternated with 2 cycles of cyclophosphamide, methotrexate, and 5-fluorouracil prior to mastectomy; irradiation was administered when the tumor was not amenable to surgical resection. Additional chemotherapy and tamoxifen, in hormone receptor-positive tumors, was used after mastectomy. Post-operative irradiation was given on a selective basis for patients at high risk for locoregional disease recurrence. RESULTS: Although 5 patients (7%) had disease progression, clinical partial or complete tumor response to preoperative chemotherapy was noted in 46 patients (65%). Sixty-eight patients (96%) underwent mastectomy. With a median follow-up of 52 months, the relapse-free and overall survival rates at 5 years were 42% and 57% respectively. Locoregional tumor recurrence occurred in 14 patients (20%), and 28 patients (39%) developed metastatic disease. Menopausal status, clinical presentation (noninflammatory vs. inflammatory), and American Joint Committee on Cancer clinical stage were independent covariates associated with patient outcome. CONCLUSIONS: Preoperative alternating chemotherapy, with the selective use of irradiation, resulted in significant locoregional disease regression and the successful integration of mastectomy into the therapeutic strategy. Locoregional tumor control and relapse-free and overall survival estimates for the approach described herein compared favorably with other comtemporary reports for this condition.

Adult↗

Acute cholecystitis. Does the clinical diagnosis correlate with the pathological diagnosis?

BACKGROUND: Most of the literature dealing with the surgical management of acute cholecystitis bases patient selection on pathological diagnosis, either exclusively or using it as a major selection criteria or as a confirmation of diagnosis. The purpose of this study was to examine the correlation between preoperative clinical findings, intraoperative gross findings, and postoperative pathological findings. METHODS: A retrospective review of 493 consecutive laparoscopic cholecystectomies performed by a single surgeon (RJF) in a single institution was done. Four different sets of criteria were used to define four groups of patients as having acute cholecystitis: (1) preoperative acute cholecystitis based on defined criteria (PA); (2) intraoperative gross findings of acute or subacute cholecystitis based on surgeon assessment of inflammation (IA); (3) initial pathological evaluation by a staff pathologist (IP); and (4) expert pathological (EP) review using strictly defined histological criteria. RESULTS: Of 41 patients, 40 (97.6%) were classified as having acute cholecystitis by IA, 21 (51.2%) by IP, and 17 (41.5%) by EP. Of the 75 patients classified as having acute cholecystitis by IA, 40 (53.0%) were classified acute by PA, 34 (45. 0%) by IP, and 17 (22.7%) by EP. Of the 72 IP patients, 34 (47.2%) were classified as acute by IA, 15 (20.8%) by EP, and 24 (33.3%) were PA. Of the 32 EP patients, 21 (65.6%) were classified as acute by IA, 14 (43.8%) by IP, and 18 (56.3%) were PA. CONCLUSION: The correlation between the pathological diagnosis and intraoperative findings is poor. Preoperative clinical findings of acute cholecystitis are highly reliable for predicting intraoperative gross findings. However, intraoperative findings of acute cholecystitis are commonly found in the absence of preoperative clinical signs. Recommendations for surgical therapy should be based on studies which use either operative findings or the preoperative clinical findings as the basis for patient selection.

Adolescent↗

An alternative technique for treatment of choledocholithiasis found at laparoscopic cholecystectomy.

OBJECTIVE: To introduce a new strategy for dealing with abnormal cholangiograms at laparoscopic cholecystectomy that makes postoperative cholangiograms possible and facilitates stone extraction by assuring access to the duct for a guide-wire-assisted endoscopic retrograde sphincterotomy. DESIGN: Retrospective review of a prospectively maintained database. PATIENTS: Twenty-four patients with abnormal cholangiograms had a percutaneously placed double-lumen catheter threaded through the cystic duct and advanced into the duodenum. RESULTS: Ten successful guide-wire-assisted endoscopic retrograde sphincterotomies were performed without complications. Eleven normal postoperative cholangiograms suggested spontaneous stone passage or false-positive intraoperative cholangiograms. There were three technical failures in the early part of the series. CONCLUSIONS: This strategy is a reasonable alternative to laparoscopic common bile duct exploration (1) when the cholangiogram is questionably positive, (2) when prolonged anesthesia (poor-risk patient) should be avoided, (3) when the equipment for laparoscopic common bile duct exploration is not available, and (4) when spontaneous stone passage seems likely. Postoperative endoscopic retrograde sphincterotomy with stone extraction is facilitated when it becomes necessary because a guide wire can be introduced through the catheter.

Adult↗