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Background: This study aimed to quantify the clinical parameters of mono- and bipolar instruments that inhibit pacemaker function. The specific aims were to quantify pacer inhibition resulting from the monopolar instrument by altering the generator power setting, the generator mode, the distance between the active electrode and the pacemaker, and the location of the dispersive electrode.Methods: A transvenous ventricular lead pacemaker overdrive paced the native heart rate of an anesthetized pig. The primary outcome variable was pacer inhibition quantified as the number of beats dropped by the pacemaker during 5 s of monopolar active electrode activation.Results: Lowering the generator power setting from 60 to 30 W decreased the number of dropped paced events (2.3 ± 1.2 vs 1.6 ± 0.8 beats; p = 0.045). At 30 W of power, use of the cut mode decreased the number of dropped paced beats compared with the coagulation mode (0.6 ± 0.5 vs 1.6 ± 0.8; p = 0.015). At 30 W coagulation, firing the active electrode at different distances from the pacemaker generator (3.75, 7.5, 15, and 30 cm) did not change the number of dropped paced beats (p = 0.314, analysis of variance [ANOVA]). The dispersive electrode was placed in four locations (right/left gluteus, right/left shoulder). More paced beats were dropped when the current vector traveled through the pacemaker/leads than when it did not (1.5 ± 1.0 vs 0.2 ± 0.4; p < 0.001).Conclusions: Clinical parameters that reduce the inhibition of a pacemaker by monopolar instruments include lowering the generator power setting, using cut (vs coagulation) mode, and locating the dispersive electrode so the current vector does not traverse the pacemaker generator or leads. [ABSTRACT FROM AUTHOR]

Background and Objectives: Neoadjuvant chemoradiation for rectal cancer is associated with lower local recurrence rates. The objective of this study is to assess the impact of neoadjuvant therapy on perioperative complications in patients with rectal cancer., Methods: Using the ACS-NSQIP database (2005-2012), a propensity score was used to match 3592 patients with rectal cancer receiving neoadjuvant therapy to 3592 patients undergoing surgery alone. The association between neoadjuvant chemoradiation and perioperative outcomes was evaluated., Results: Among all patients, overall morbidity was significantly higher in the neoadjuvant therapy group (n = 1170, 29.9%) compared to the surgery alone (n = 2350, 26.4%; P < 0.0001), but 30-day mortality was lower in the neoadjuvant group (n = 27, 0.7%) compared to the surgery alone group (n = 112, 1.3%; P = 0.0043). However, in propensity-matched patients, there was no difference in overall morbidity (OR 0.912, 95% CI 0.825-1.008) or 30-day mortality (OR 0.639, 95% CI 0.38-1.05). Overall morbidity and 30-day mortality were 29.3% (n = 1054) and 0.7% (n = 25) in the neoadjuvant group, respectively, compared to 31.3% (n = 1124) and 1.1% (n = 39) in the surgery alone group, respectively., Conclusion: Patients with newly diagnosed rectal cancer could be evaluated for neoadjuvant therapy prior to surgical resection without the fear of upfront therapy causing a significant increase in perioperative complications., (© 2017 Wiley Periodicals, Inc.)

Background: The monopolar instrument emits stray radiofrequency energy from its cord when activated. This is a source of unintended thermal injury to patients. Stray energy emitted from the dispersive electrode cord has not been studied. The purpose of this study was to determine whether, and to what extent, the dispersive electrode cord contributes to unintentional energy transfer and describe practical steps to minimize risk., Methods: In a laparoscopic simulator, a monopolar generator delivered radiofrequency energy to an L-hook. Thermal imaging quantified the change in tissue temperature nearest to the tip of a non-electrical instrument following activation. The orientation of the dispersive electrode cord was varied relative to other instruments., Results: When the dispersive electrode cord is parallel to the camera cord, tissue temperature increased at the telescope tip by 46 ± 6 °C from baseline (p < 0.001). Similar heat was generated when the camera cord was oriented parallel to the active electrode cord (46 ± 6 vs. 48 ± 7 °C, respectively, p = 0.48). Adding a second dispersive electrode decreased the temperature change (46 ± 6 vs. 25 ± 9 °C, p < 0.001). Temperature increase was greater with coagulation versus cut mode (33 ± 7 vs. 22 ± 6 °C, p < 0.001)., Conclusion: Stray energy emitted from the dispersive electrode cord heats tissue >40 °C via antenna coupling; the same magnitude as the active electrode cord. Practical steps to minimize stray energy transfer include avoiding orienting the dispersive electrode cord in parallel with other cords, adding a second dispersive electrode, and using low-voltage cut mode.

Background: Pneumoperitoneum on computed tomography (CT) after abdominal surgery is common, but its incidence, duration, and clinical significance is widely debated., Materials and Methods: A retrospective, cohort study of patients who underwent abdominal CT within 30 days of abdominal surgery., Results: Among 344 patients, pneumoperitoneum was found in 39% (135/344) of patients on postoperative days 0-6 in 53%, 7-13 in 41%, 14-20 in 23%, 21-27 in 13%, and 28-30 in 0%. Pneumoperitoneum was associated with the presence of a drain (P = 0.014) but not with age, gender, body mass index, smoking history, lung disease, or open versus laparoscopic surgery (P > 0.05 for all variables). Eight patients required intervention (6%), most commonly for anastomotic leak (4 patients, 50%)., Conclusions: Postoperative pneumoperitoneum on abdominal CT can be seen in up to 23% of patients 3-weeks postoperatively; however, only 6% of the patients required intervention emphasizing the typically benign consequences of postoperative free air., (Published by Elsevier Inc.)

Background: Energy-based devices are used in virtually every operation. Our purposes were to describe causes of energy-based device complications leading to injury or death, and to determine if common mechanisms leading to injury or death can be identified., Study Design: The FDA's Manufacturer and User Facility Device Experience (MAUDE) database was searched for surgical energy-based device injuries and deaths reported over 20 years (January 1994 to December 2013). Device-related complications were recorded and analyzed., Results: We analyzed 178 deaths and 3,553 injuries. Common patterns of complications were: thermal burns, 63% (n = 2,353); hemorrhage, 17% (n = 642); mechanical failure of device, 12% (n = 442); and fire, 8% (n = 294). Events were identified intraoperatively in 82% (3,056), inpatient postoperatively in 9% (n = 351), and after discharge in 9% (n = 324). Of the deaths, 12% (n = 22) occurred after discharge home. Common mechanisms for thermal burn injuries were: direct application, 30% (n = 694); dispersive electrode burn, 29% (n = 657); and insulation failure, 14% (n = 324). Thermal injury was the most common reason for death (39%, n = 70). The mechanism for these thermal injuries was most frequently direct application (84%, n = 59, p < 0.001 vs all other mechanisms). Fires were most common with monopolar "Bovie" instruments (88%, n = 258, p < 0.001 vs all other devices) when they were used in head and neck operations (66%, n = 193, p < 0.001 vs all other locations)., Conclusions: Complications due to energy-based devices occur from 4 main causes: thermal burn, hemorrhage, mechanical failure, and fire. Thermal direct application injuries are the most common reason for both injury and death., (Published by Elsevier Inc.)

Objective(s): The monopolar "Bovie" is used in virtually every laparoscopic operation. The active electrode and its cord emit radiofrequency energy that couples (or transfers) to nearby conductive material without direct contact. This phenomenon is increased when the active electrode cord is oriented parallel to another wire/cord. The parallel orientation of the "Bovie" and laparoscopic camera cords cause transfer of energy to the camera cord resulting in cutaneous burns at the camera trocar incision. We hypothesized that separating the active electrode/camera cords would reduce thermal injury occurring at the camera trocar incision in comparison to parallel oriented active electrode/camera cords., Methods: In this prospective, blinded, randomized controlled trial, patients undergoing standardized laparoscopic cholecystectomy were randomized to separated active electrode/camera cords or parallel oriented active electrode/camera cords. The primary outcome variable was thermal injury determined by histology from skin biopsied at the camera trocar incision., Results: Eighty-four patients participated. Baseline demographics were similar in the groups for age, sex, preoperative diagnosis, operative time, and blood loss. Thermal injury at the camera trocar incision was lower in the separated versus parallel group (31% vs 57%; P = 0.027)., Conclusions: Separation of the laparoscopic camera cord from the active electrode cord decreases thermal injury from antenna coupling at the camera trocar incision in comparison to the parallel orientation of these cords. Therefore, parallel orientation of these cords (an arrangement promoted by integrated operating rooms) should be abandoned. The findings of this study should influence the operating room setup for all laparoscopic cases.

Background: Surgical energy-based devices emit energy, which can interfere with other electronic devices (eg, implanted cardiac pacemakers and/or defibrillators). The purpose of this study was to quantify the amount of unintentional energy (electromagnetic interference [EMI]) transferred to an implanted cardiac defibrillator by common surgical energy-based devices., Methods: A transvenous cardiac defibrillator was implanted in an anesthetized pig. The primary outcome measure was the average maximum EMI occurring on the implanted cardiac device during activations of multiple different surgical energy-based devices., Results: The EMI transferred to the implanted cardiac device is as follows: traditional bipolar 30 W .01 ± .004 mV, advanced bipolar .004 ± .003 mV, ultrasonic shears .01 ± .004 mV, monopolar Bovie 30 W coagulation .50 ± .20 mV, monopolar Bovie 30 W blend .92 ± .63 mV, monopolar instrument without dispersive electrode .21 ± .07 mV, plasma energy 3.48 ± .78 mV, and argon beam coagulator 2.58 ± .34 mV., Conclusion: Surgeons can minimize EMI on implanted cardiac defibrillators by preferentially utilizing bipolar and ultrasonic devices., (Copyright © 2014 Elsevier Inc. All rights reserved.)

Background: The monopolar "Bovie" instrument emits radiofrequency energy that can disrupt the function of other implanted electronic devices through a phenomenon termed electromagnetic interference. The purpose of this study was to quantify the electromagnetic interference occurring on cardiac implantable devices (CIEDs) resulting from monopolar instrument use in common, modifiable clinical scenarios., Study Design: Three anesthetized pigs underwent CIED placement (1 pacemaker and 2 defibrillators). Electromagnetic interference was quantified when changing the monopolar instrument parameters of generator power, generator mode, surgical technique, orientation of active electrode cord, pathway of current vector, and proximity of active electrode to the CIED., Results: Monopolar instrument parameters that decreased the electromagnetic interference occurring on the CIED included decreasing generator power from 60 W to 30 W (p < 0.001), using cut mode rather than coag mode (p < 0.001), using desiccation technique rather than fulguration technique (p < 0.001), orienting the active electrode cord from the feet rather than across the chest wall (p < 0.001), and avoiding the current vector from crossing the CIED system (p < 0.001). Increasing the distance between the active electrode tool and the CIED system decreased electromagnetic interference occurring on the CIED in a dose-response fashion up to a distance of 10 cm (ANOVA, p < 0.001), after which the magnitude of electromagnetic interference remained constant., Conclusions: Electromagnetic interference occurring on CIEDs resulting from monopolar instruments is minimized by decreasing generator power, using cut mode, using desiccation technique, orienting the active electrode cord from the feet, avoiding the current vector for crossing the CIED system, and increasing the distance between the active electrode and the CIED. Surgeons and operating room staff can minimize electromagnetic interference on CIEDs during monopolar instrument use by accounting for these modifiable clinical factors., (Copyright © 2014 American College of Surgeons. Published by Elsevier Inc. All rights reserved.)

Background: The purpose of this study was to compare histologic evidence of thermal injury at the epigastric and umbilical incisions after elective laparoscopic cholecystectomy performed using the monopolar "Bovie" instrument set on the higher voltage coag mode versus the lower voltage blend mode. We hypothesized that the higher voltage coag mode would create more unintended thermal tissue injury at the epigastric trocar's incision., Methods: A prospective blinded randomized controlled trial of patients undergoing elective laparoscopic cholecystectomy was performed. Patients were randomized to have their operation performed with the monopolar instrument set at 30 W on either the coag mode or the blend mode. Immediately at the end of the operation, a biopsy sample of skin was obtained from the lower edge of the epigastric incision (through which the monopolar instrument was inserted) and the umbilical incision (through which the camera/telescope was inserted). The outcomes measured were histologic evidence of thermal injury at the epigastric and umbilical incisions (determined by a blinded pathologist)., Results: Forty patients were randomized (20 per group). Baseline demographics in the two groups were similar for age, gender, body mass index, preoperative diagnosis, operative time, and blood loss. Unintentional thermal injury was found at 20 % of epigastric incisions and 35 % of umbilical incisions in the total group. The incidence of thermal injury was higher after operations using the coag mode compared to the blend mode at both the epigastric (35 vs. 5 %; p = 0.044) and umbilical (55 vs. 15 %; p = 0.019) trocar incisions., Conclusions: Radiofrequency energy from the monopolar Bovie instrument causes unintentional thermal injury to skin adjacent to the epigastric and umbilical trocar incisions. The incidence of thermal injury was reduced by using the lower voltage blend mode compared to the coag mode at both the epigastric and umbilical trocar incisions., Registration Number: NCT016648060 ( www.clinicaltrials.gov ).

Objective: The purpose of this study was to determine the relationship between the Timed Up and Go test and postoperative morbidity and 1-year mortality, and to compare the Timed Up and Go to the standard-of-care surgical risk calculators for prediction of postoperative complications., Methods: In this prospective cohort study, patients 65 years and older undergoing elective colorectal and cardiac operations with a minimum of 1-year follow-up were included. The Timed Up and Go test was performed preoperatively. This timed test starts with the subject standing from a chair, walking 10 feet, returning to the chair, and ends after the subject sits. Timed Up and Go results were grouped as fast ≤ 10 seconds, intermediate = 11-14 seconds, and slow ≥ 15 seconds. Receiver operating characteristic curves were used to compare the 3 Timed Up and Go groups to current standard-of-care surgical risk calculators at forecasting postoperative complications., Results: This study included 272 subjects (mean age of 74 ± 6 years). Slower Timed Up and Go was associated with increased postoperative complications after colorectal (fast 13%, intermediate 29%, and slow 77%; P < 0.001) and cardiac (fast 11%, intermediate 26%, and slow 52%; P < 0.001) operations. Slower Timed Up and Go was associated with increased 1-year mortality following both colorectal (fast 3%, intermediate 10%, and slow 31%; P = 0.006) and cardiac (fast 2%, intermediate 3%, and slow 12%; P = 0.039) operations. Receiver operating characteristic area under curve of the Timed Up and Go and the risk calculators for the colorectal group was 0.775 (95% CI: 0.670-0.880) and 0.554 (95% CI: 0.499-0.609), and for the cardiac group was 0.684 (95% CI: 0.603-0.766) and 0.552 (95% CI: 0.477-0.626)., Conclusions: Slower Timed Up and Go forecasted increased postoperative complications and 1-year mortality across surgical specialties. Regardless of operation performed, the Timed Up and Go compared favorably to the more complex risk calculators at forecasting postoperative complications.

Background: Electromagnetic coupling can occur between the monopolar "Bovie" instrument and other laparoscopic instruments without direct contact by a phenomenon termed antenna coupling. The purpose of this study was to determine if, and to what extent, radiofrequency energy couples to other common laparoscopic instruments and to describe practical steps that can minimize the magnitude of antenna coupling., Methods: In a laparoscopic simulator, monopolar radiofrequency energy was delivered to an L-hook. The tips of standard, nonelectrical laparoscopic instruments (either an unlit 10 mm telescope or a 5 mm grasper) were placed adjacent to bovine liver tissue and were never in contact with the active electrode. Thermal imaging quantified the change in tissue temperature nearest the tip of the telescope or grasper at the end of a 5 s activation of the active electrode., Results: A 5 s activation (30 watts, coagulation mode, 4 cm separation between instruments) increased tissue temperature compared with baseline adjacent to the grasper tip (2.2 ± 2.2 °C; p = 0.013) and telescope tip (38.2 ± 8.0 °C; p < 0.001). The laparoscopic telescope tip increased tissue temperature more than the laparoscopic grasper tip (p < 0.001). Lowering the generator power from 30 to 15 Watts decreased the heat generated at the telescope tip (38.2 ± 8.0 vs. 13.5 ± 7.5 °C; p < 0.001). Complete separation of the camera/light cords and the active electrode cord decreased the heat generated near the telescope tip compared with parallel bundling of the cords (38.2 ± 8.0 vs. 15.7 ± 11.6 °C; p < 0.001)., Conclusions: Commonly used laparoscopic instruments couple monopolar radiofrequency energy without direct contact with the active electrode, a phenomenon that results in heat transfer from a nonelectrically active instrument tip to adjacent tissue. Practical steps to minimize heat transfer resulting from antenna coupling include reducing the monopolar generator power setting and avoiding of parallel bundling of the telescope and active electrode cords.

Objectives: (1) To determine if antenna coupling occurs in common operating room scenarios. (2) To define modifiable clinical variables that reduce the magnitude of antenna coupling., Background: Mechanisms of electrosurgical burns where monitoring devices contact the surgical patient are unclear. Antenna coupling occurs when the "bovie" active electrode (electrically active transmitting antenna) emits energy, which is captured by a nonelectrically active wire (electrically inactive receiving antenna) in close proximity without direct contact., Methods: Monopolar radiofrequency energy was delivered to a laparoscopic instrument (electrically active transmitting antenna), whereas other nonelectrically active wires (electrically inactive receiving antenna) including electrocardiogram (EKG) lead, nonactive "bovie" pencil, and nerve electrode monitor were placed in proximity. Temperature changes of tissue placed adjacent to the electrically inactive receiving antennae were measured., Results: Nonelectrically active wires (receiving antenna) increase tissue temperature when lying parallel to the active electrode cord: EKG pad 2.4°C ± 1.2°C (P = 0.002), "bovie" pencil tip 90°C ± 9°C (P < 0.001), and nerve electrode monitor 106°C ± 12°C (P < 0.001). Factors that reduced the heat generated by antenna coupling included the following: increasing angulation between transmitting and receiving antennae (parallel = 90°C ± 9°C; 45° angle = 53°C ± 10°C; perpendicular = 35°C ± 11°C; P < .001), increasing separation distance between parallel transmitting and receiving antenna (<1 cm = 90°C ± 9°C; 15 cm = 44°C ± 18°C; 30 cm = 39°C ± 2°C; P < .001); and decreasing generator power setting (15 W = 59°C ± 11°C; 30 W = 90°C ± 9°C; 45 W = 98°C ± 8°C; P < .001)., Conclusions: Antenna coupling occurs in common operating room scenarios. Simple, practical measures by the surgeon, such as orienting the receiving antenna at a greater angle and with greater separation to the active electrode cord, or lowering the generator power setting reduce antenna coupling.

Background: The purpose of this study was to determine the relationship of frailty and 6-month postoperative costs., Methods: Subjects aged ≥ 65 years undergoing elective colorectal operations were enrolled in a prospective observational study. Frailty was assessed by a validated measure of function, cognition, nutrition, comorbidity burden, and geriatric syndromes. Frailty was quantified by summing the number of positive characteristics in each subject., Results: Sixty subjects (mean age, 75 ± 8 years) were studied. Inpatient mortality was 2% (n = 1). Overall, 40% of subjects (n = 24) were considered nonfrail, 22% (n = 13) were prefrail, and 38% (n = 22) were frail. With advancing frailty, hospital costs increased (P < .001) and costs from discharge to 6-months increased (P < .001). Higher degrees of frailty were related to increased rates of discharge institutionalization (P < .001) and 30-day readmission (P = .044)., Conclusions: A simple, brief preoperative frailty assessment accurately forecasts increased surgical hospital costs and postdischarge to 6-month healthcare costs after colorectal operations in older adults., (Published by Elsevier Inc.)

Background: Energy devices are essential laparoscopic tools. Residual heat is defined as the increased instrument temperature after energy activation is completed. This study aimed to determine the length of time a surgeon needs to wait before touching other tissue using four common laparoscopic energy sources., Methods: Thermal imaging quantified instrument and tissue temperature ex vivo using monopolar coagulation, argon beam coagulation, ultrasonic dissection, and bipolar tissue fusion devices. To simulate realistic operative usage, each instrument was activated for 5 s four consecutive times with 5 s pauses between fires. Thermal conductivity to bovine liver tissue was measured 2.5, 5, 10, and 20 s after final activation., Results: The maximum increase in instrument tip temperature was 172 ± 63°C for the ultrasonic dissection, 81 ± 18°C for the monopolar coagulation, 46 ± 19°C for the bipolar tissue fusion, and 1 ± 1°C for the argon beam coagulation (P < 0.05 for all comparisons). Touching the instrument tip to tissue at four intervals after the final activation (2.5, 5, 10, and 20 s) found that ultrasonic energy raised the tissue temperature higher (maximum change, 58°C) than the other three energy devices at all four time points (P < 0.05)., Conclusions: Ultrasonic energy instruments have greater residual heat than monopolar electrosurgery, bipolar tissue fusion, and argon beam. The ultrasonic energy instrument tips heated tissue more than 20°C from baseline even 20 s after activation; whereas all the other energy sources raised the tissue temperature less than 20°C by 5 s. These practical findings may alter a surgeon's usage of these common energy devices.

Background: Electrosurgery is used in virtually every laparoscopic operation. In the early days of laparoscopic surgery, capacitive coupling, associated with hybrid trocars, was thought to be the major cause of laparoscopic electrosurgery injuries. Modern laparoscopy has reduced capacitive coupling, and now insulation failure is thought to be the main cause of electrosurgical complications. The aim of this study was (1) to determine the incidence of insulation failures, (2) to compare the incidence of insulation failure in reusable and disposable instruments, and (3) to determine the location of insulation failures., Methods: At four major urban hospitals, reusable laparoscopic instruments were checked for insulation failure using a high-voltage porosity detector. Disposable L-hooks were collected following laparoscopic cholecystectomy and similarly evaluated for insulation failure. Instruments were determined to have insulation failure if 2.5 kV crossed the instrument's insulation to create a closed loop circuit. Statistical analysis was performed using Fisher's exact or chi(2) analysis (*denotes significance set at p < 0.05)., Results: Two hundred twenty-six laparoscopic instruments were tested (165 reusable). Insulation failure occurred more often in reusable (19%; 31/165) than in disposable instruments (3%; 2/61; *p < 0.01). When reusable sets were evaluated, 71% (12/17) were found to have at least one instrument with insulation failure. Insulation failure incidence in reusable instruments was similar between hospitals that routinely checked for insulation failure (19%; 25/130) and hospitals that do not routinely check for insulation failures (33%; 7/21; p = 0.16). Insulation failure was most common in the distal third of the instruments (54%; 25/46) compared to the middle or proximal third of the instruments (*p < 0.05)., Conclusion: One in five reusable laparoscopic instruments has insulation failure; a finding that is not altered by whether the hospital routinely checks for insulation defects. Disposable instruments have a lower incidence of insulation failure. The distal third of laparoscopic instruments is the most common site of insulation failure.

Endoscopic treatment for bleeding esophageal varices was first described 65 years ago, but the technique was not widely adopted until the 1970s. Rapid progress since then has resulted in new, more effective forms of endoscopic treatment. Currently, endoscopic therapy is the primary treatment for patients with bleeding esophageal varices at most centers. This review traces the evolution of endoscopic treatment, summarizes current outcomes data, and speculates on future development.

Treatment for most patients with upper gastrointestinal bleeding has shifted from the operating room to the endoscopy suite. Endoscopic treatment has resulted in substantial benefit for patients with bleeding from peptic ulcer. Ulcers associated with high-risk stigmata of recent hemorrhage (SRH) not treated endoscopically have 40 per cent to 100 per cent risk of continued or recurrent bleeding and up to a 35 per cent chance of requiring surgical control of bleeding. Endoscopic therapy has reduced the risk of recurrent bleeding to 10 per cent to 20 per cent and the need for surgery to 5 per cent to 10 per cent. These improvements translate to shorter hospital stays, fewer transfusions, lower costs, and less morbidity. Similar progress has been made for patients bleeding from esophageal varices. Mortality for a first variceal bleed is now approximately 20 per cent as compared with 40 per cent to 60 per cent in past decades. Rebleeding after initially successful endoscopic hemostasis is often best treated by a second attempt at endoscopic control. The decision regarding management of recurrent bleeding should be made at the time initial endoscopic control is achieved. Local factors such as experience of the endoscopic team, availability of interventional radiologists, and individual patient characteristics should guide these decisions. Failures of endoscopic control and patients with massive hemorrhage still require operative intervention.

The role of laparoscopic surgery in the management of polycystic liver disease (PCLD) is not well defined. The authors hypothesized that laparoscopic fenestration for PCLD relieves symptoms caused by polycystic liver disease. In this study, 11 patients underwent 20 laparoscopic cyst fenestration operations as treatment for symptoms of their PCLD. Symptoms leading to surgery were pain and pressure in 15 (75%) and early satiety in 12 (60%) patients. The median hospital stay was 1 day. The symptoms resolved postoperatively in all the patients. An additional laparoscopic fenestration was required in six (55%) patients for recurrent symptoms. The average time to reoperation was 22 +/- 16 months. Two patients required hepatic transplantation. Initial symptom resolution occurred in all the patients undergoing redo fenestration. The authors conclude that laparoscopic fenestration for PCLD is safe, results in minimal "down" time and relieves the symptoms caused by PCLD. Symptomatic relief usually is temporary, and repeat surgery is required for recurring symptoms in half of the patients.

Background: Despite advances in surgical, endoscopic, and percutaneous therapeutic techniques, pancreatic fistulas remain a source of significant morbidity and long-term patient discomfort. The intraoperative use of fibrin sealant has been used prophylactically to prevent formation of fistula. We recognized the potential use of fibrin glue as a therapeutic modality for successful resolution of low-output pancreatic fistulas., Methods: Three patients with low (<20 ml per day) output pancreatic fistulas underwent fluoroscopically directed injection of fibrin glue along their fistula tract., Results: All 3 patients underwent successful fibrin glue injection without procedural complication. All fistula output stopped, and the 3 patients remained asymptomatic at 1 year., Conclusions: Fibrin glue inserted with image-guided catheter delivery systems may be a useful option in selected patients with low-output pancreatic fistulas.

Minimally invasive surgery is replacing the traditional open surgical approach for many abdominal procedures. The benefits of reduced pain, quicker return of oral intake, shorter hospitalizations, and improved cosmetic results all support the increasing use of the laparoscopic approach. This review identifies important articles published in the literature on minimally invasive surgery from June 2002 to August 2003, with the objective of identifying future trends and directions in laparoscopic surgery. The topics of articles reviewed in detail include minimally invasive techniques applied to esophageal tumors, morbid obesity, malignant liver tumors, gallbladder disease, pancreatic pathology, colon cancer, and robotic prostatectomy.

Variceal hemorrhage is a frequent complication of cirrhosis and is associated with a high mortality rate, especially in patients with decompensated liver disease. Endoscopy is useful in identifying factors that predict a high likelihood of bleeding, including large varices and red colour signs. Endoscopic rubber band ligation has superseded sclerotherapy in the prevention of both recurrent hemorrhage and the first episode of bleeding, because it causes fewer complications and requires fewer sessions to eradicate varices. It has been proven to be more effective than nontreatment in the primary prophylaxis against variceal hemorrhage. There is extensive literature that has found that band ligation is more effective than beta-adrenergic receptor antagonists at preventing the first variceal hemorrhage. There is ongoing debate about the relative merits of these two approaches, but the available evidence supports the conclusion that band ligation is the treatment of choice in the primary prevention of variceal bleeding. Trials of combined medical and endoscopic therapy are eagerly awaited, and the author suspects that it may prove to be more effective than either modality alone.

Background: Bile duct injury is a major complication of laparoscopic cholecystectomy. The purpose of this study was to evaluate our management strategy and outcomes for the treatment of such injuries., Methods: We studied 54 consecutive patients who had de novo bile duct injury (n = 20) or prior biliary injury repair (n = 34) associated with laparoscopic cholecystectomy. All patients were managed using a multidisciplinary approach., Results: Definitive operation, almost always Roux-en-Y hepaticojejunostomy, was required in 85% of patients. We inserted external percutaneous biliary catheters in 98% of cases prior to surgery. There were no operative deaths, and the 30-day complication rate was 20%. Eight patients (15%) were managed nonoperatively. Overall, 96% of patients had no long-term, objectively definable biliary sequelae., Conclusions: Treatment of bile duct injury associated with laparoscopic cholecystectomy is optimally done using a multidisciplinary approach. Surgical reconstruction is required in most cases and can be safely accomplished with minimal morbidity and excellent long-term outcomes.

Background: A totally transoral outpatient procedure for the treatment of GERD would be appealing., Methods: A multicenter trial was initiated that included 64 patients with GERD treated with an endoscopic suturing device. Inclusion criteria were 3 or more heartburn episodes per week while not taking medication, dependency on antisecretory medicine, and documented acid reflux by pH monitoring. Exclusion criteria were dysphagia, grade 3 or 4 esophagitis, obesity, and hiatus hernia greater than 2 cm in length. Patients underwent manometry, endoscopy, 24-hour pH monitoring, and symptom severity scoring before and after the procedure. Patients were randomized to a linear or circumferential plication configuration. Adverse procedural events were recorded., Results: Mean 6-month symptom score changes demonstrated procedural efficacy. Heartburn severity and frequency as well as regurgitation all improved (p > 0.0001 for each). Twenty-four-hour pH monitoring showed improvement in number of episodes below pH of 4 at 3 and 6 months (p < 0.0007 and 0.0002) and percentage of total time the pH was less than 4 at 6 months (p < 0.011). Plication configuration did not affect symptoms or pH monitoring results. One patient had a self-contained suture perforation that was successfully treated with antibiotics., Conclusion: Endoscopic gastroplasty is safe. It is associated with reduced symptoms and medication use at 6 month follow-up in patients with uncomplicated GERD.

Background: Morbidity and mortality after surgical treatment of bileduct stones increase with age and associated diseases. A proposed alternative therapy is endoscopic sphincterotomy (ES) with the gallbladder left in situ, and we elected to compare this option with standard open surgery in high-risk patients., Methods: 98 patients (mean age 80 years) with symptoms likely to be due to bileduct stones or a recent episode of biliary pancreatitis were randomised to be treated either by open cholecystectomy with operative cholangiography and (if necessary) bileduct exploration (n = 48) or by endoscopic sphincterotomy alone (n = 50)., Findings: The procedure was accomplished successfully in 94% of the surgery group and 88% of the ES group, and there were no significant differences in immediate morbidity (23% vs 16%) or mortality (4% vs 6%). During mean follow-up of 17 months biliary symptoms recurred in three surgical patients, none of whom underwent repeat surgery, and in 10 ES patients, seven of whom had biliary surgery. By multivariate regression analysis endoscopic sphincterotomy was an independent predictor of recurrent biliary symptoms (odds ratio 6.9; 95% Cl 1.46 to 32.54)., Interpretation: In elderly or high-risk patients, surgery is preferably to endoscopic sphincterotomy with the gallbladder left in situ as a definitive treatment for bileduct stones or non-severe biliary pancreatitis.

Patients who have bled from varices remain at risk for rebleeding. There is interest in methods that would enable rapid eradication of varices. The present trial was designed to study whether combining ligation with sclerotherapy will allow quicker eradication of varices than either modality alone. Patients with bleeding esophageal varices were randomized into ligation or combination therapy groups. Patients in the ligation group were treated with endoscopic rubber band ligation alone. In combination group patients, each variceal column was ligated distally and 1 mL of ethanolamine was injected proximal to each ligated site. Subsequent treatment sessions were at 7- to 14-day intervals until varices were eradicated. The clinical and endoscopic characteristics of 25 patients in the ligation group were similar to those of 22 patients in the combination group. Follow-up was up to 30 months. Active bleeding was controlled in 100% of patients in the ligation group and 75% of those in combination group (P = NS). It took 3.3 +/- .4 (range, 1-7) sessions to eradicate varices with ligation and 4.1 +/- .6 (1-7) with combination therapy (P = NS). Survival (four deaths in ligation group, 8 in combination group), rebleeding rate (25% vs. 36%), and varix recurrence (16% vs. 23%) also were similar. There were more complications with combination therapy, including deep ulcers (65% vs. 20%; P < .05); dysphagia (30% vs. 0%; P < .05), with three strictures requiring dilation; and pain (30% vs. 10%; P = NS). Our results show that sclerotherapy combined with ligation offers no benefit over ligation alone. The higher complication rate with combination therapy does not warrant this approach.

Background: Exposure for open cholecystectomy entails lateral, caudal traction on the gallbladder infundibulum, which results in opening the angle between the cystic and hepatic ducts. Laparoscopic cholecystectomy (LC), as initially described, is done with cephalad traction on the gallbladder. We hypothesized LC exposure technique narrows the angle between the cystic and hepatic ducts, placing them at increased risk of injury., Methods: Twenty-three patients had routine LC. Cystic duct cholangiography (IOC) was done with a flexible 5-Fr catheter via a percutaneous introducer placed anterior to the gallbladder. Exposure of Calot's triangle was maintained with cephalad traction on the gallbladder fundus. IOC was repeated after allowing the organ to assume the anatomic position. The cholangiograms were inspected for significant differences, and the angle of the cystic to the hepatic duct (CDHD) was measured by a blinded radiologist., Results: The mean angle of the cystic to hepatic duct was 30 degrees +/- 19 degrees in the IOCs taken with cephalad traction on the gallbladder fundus vs 59 degrees +/- 22 degrees, P < 0.001, in the cholangiograms taken without traction. A filling defect at the cystic-hepatic duct junction was present in 39% of IOC taken with traction vs none without traction. The intrahepatic ducts were seen in all films without traction, whereas the intrahepatic ducts were not visualized in 13% of IOCs taken with traction., Conclusions: From these data we conclude (1) extra-hepatic biliary ducts may be at increased risk of injury during LC because of the exposure technique and (2) imaging bile ducts in the anatomic position may convey misleading information about the relative location of important structures. Optimal exposure for dissection of Calot's triangle should utilize a second clamp on the infundibulum with lateral, caudal traction.

Background: Photodynamic therapy (PDT) is a different type of laser treatment from Nd:YAG thermal ablation for palliation of dysphagia from esophageal cancer., Methods: In this prospective, multicenter study, patients with advanced esophageal cancer were randomized to receive PDT with porfimer sodium and argon-pumped dye laser or Nd:YAG laser therapy., Results: Two hundred thirty-six patients were randomized and 218 treated (PDT 110, Nd:YAG 108) at 24 centers. Improvement in dysphagia was equivalent between the two treatment groups. Objective tumor response was also equivalent at week 1, but at month 1 was 32% after PDT and 20% after Nd:YAG (p < 0.05). Nine complete tumor responses occurred after PDT and two after Nd:YAG. Trends for improved responses for PDT were seen in tumors located in the upper and lower third of the esophagus, in long tumors, and in patients who had prior therapy. More mild to moderate complications followed PDT, including sunburn in 19% of patients. Perforations from laser treatments or associated dilations occurred after PDT in 1%, Nd:YAG 7% (p < 0.05). Termination of laser sessions due to adverse events occurred in 3% with PDT and in 19% with Nd:YAG (p < 0.05)., Conclusions: Photodynamic therapy with porfimer sodium has overall equal efficacy to Nd:YAG laser thermal ablation for palliation of dysphagia in esophageal cancer, and equal or better objective tumor response rate. Temporary photosensitivity is a limitation, but PDT is carried out with greater ease and is associated with fewer acute perforations than Nd:YAG laser therapy.

We compared laparoscopic ultrasonography (LICU) with static (S) or dynamic (D) cholangiography (IOC) for assessment of duct anatomy an calculi in 209 patients. LICU visualized ducts in 88% compared with 93% for IOC (P = 0.046). Nineteen patients (9%) had stones: 17 were found by LICU (89%) and 10 (53%) by IOC (P = 0.032). Time to perform LICU (7 +/- 3 min) was less than IOC (13 +/- 6 min) (P < 0.0001). Time to perform SIOC (12 +/- 5 min) and DIOC (14 +/- 6 min) did not differ (P = 0.48), nor did these tests differ in accuracy. LICU provided useful anatomical information but IOC better defined anatomic anomalies. LICU required less time but was less reliable at defining anatomy and complete duct visualization. LICU was more sensitive for stones. SIOC and DIOC did not differ objectively. LICU and IOC are complementary.

Ultrasonography has many clinical applications and can be done with both extra- and intracorporeal techniques. Miniaturization of ultrasound transducers has opened the way for intracorporeal use of ultrasound at laparoscopy. The principles of ultrasonography are presented. Laparoscopic intracorporeal ultrasound (LICU) has proven to be useful in the differential diagnosis of liver tumours. In one series, 75 of 85 patients had positive identification of a suspected liver tumour with laparoscopic ultrasound examination. LICU has also been useful for delineation of hepatobiliary anatomy during laparoscopic cholecystectomy in both animal models and patients having cholecystectomy. LICU may detect useful anatomic information prior to dissection of the cystic duct and is accurate in detecting common bile duct stones. LICU may also be useful in the preoperative staging of pancreatic malignancy. Laparoscopic intracorporeal ultrasound may find practical application in other areas as experience evolves.

The purpose of this study was to compare laparoscopic intracorporeal ultrasound (LICU) examination of the biliary duct system with cholangiography for delineation of duct anatomy and determination of presence or absence of ductal calculi. Thirty-one patients had LICU examination of the extrahepatic bile ducts after exposure of the gallbladder but prior to dissection of the cystic duct. After LICU examination, cystic duct dissection and cholangiography were done. Evaluation of duct anatomy and decision for duct exploration were based on findings of both tests. All patients had successful LICU examination and 30 had successful cholangiography. Duct size as determined by LICU corresponded precisely with cholangiography. LICU provided useful anatomical information in two patients with aberrant anatomy and detected cholangiogram. LICU aids in delineation of biliary duct anatomy and accurately determines presence or absence of duct calculi.

Injection sclerotherapy remains the most widely used long-term management for patients after an esophageal variceal bleed. Sclerotherapy treatments should be repeated weekly until the varices are eradicated. Follow-up endoscopy every 6 to 12 months is required for life. Whenever varices recur, further weekly injection treatments are administered until re-eradication is achieved. Failure of sclerotherapy must be diagnosed early and an alternative salvage procedure performed. We currently recommend the distal splenorenal shunt. Although the complications of sclerotherapy are not great, they are cumulative with time. Unlike most surgical procedures for portal hypertension, the technique of performing sclerotherapy is not standardized, making the comparison of controlled trials difficult. The current status of controlled trials comparing sclerotherapy with other treatments is evaluated. We conclude that repeated injection sclerotherapy is at present the initial treatment of choice for patients after an esophageal variceal bleed. The technique of the new procedure of esophageal variceal ligation is described. As with sclerotherapy, weekly treatment sessions are recommended until the esophageal varices are eradicated, followed by long-term endoscopic surveillance and repeat ligation treatment when varices recur. The four controlled trials that have compared variceal ligation with sclerotherapy favor ligation. Ligation eradicated esophageal varices with fewer treatment sessions and a lower complication rate. One trial demonstrated improved survival. Complications due to the overtube are being increasingly reported but were not a problem in the controlled trials. Although esophageal variceal ligation or ligation plus sclerotherapy may ultimately prove to be superior to sclerotherapy alone, more data are required before a final conclusion can be reached.

Cryodestruction of hepatic tumors is done by freezing the tumor and an appropriate amount of surrounding normal tissue in situ. The goal is complete destruction of malignant tissue. Local and systemic host mechanisms activated by the cold injury complete the process. Resorption of devitalized tissue and stabilization of the residual scar occurs during the ensuing months. Immune factors may contribute to the long-term process of cryodestruction although such effects are inconstant and ill defined. The purpose of this overview is to delineate the mechanisms of cryodestruction, briefly summarize clinical results and discuss the technique for treatment of hepatic tumors.

Unlabelled: The purpose of this study was to develop a technique and assess the ability of a laparoscopic ultrasound probe to delineate biliary antomy and to determine the presence or absence of duct stones., Methods: Five pigs had ultrasonography of biliary structures and liver at laparoscopy followed by cholangiograms and anatomical dissection. Five patients had ultrasonography of the biliary tract at laparoscopic cholecystectomy., Results: All animals had adequate visualization of important hepatobiliary structure, and an optimal method of accessing these structures at laparoscopy was established. Patients had ultrasonography which used methods developed in the animal trial. All had adequate visualization of the entire common bile duct confirmed by cholangiography. Limitations in demonstrating the relationship of the cystic duct to the common duct were technical and can be corrected., Conclusion: Laparoscopic ultrasonography has significant potential for delineation of biliary anatomy and determination of presence or absence of duct calculi. Clinical implementation could minimize the risk of iatrogenic duct injury and the need for operative cholangiography.

We report a method of laparoscopic surgery in the rat. Our technique is illustrated by gastric fundoplication requiring two-handed dissection, suturing, and knot tying. This model for laparoscopic surgery is relatively inexpensive, can be extended to other operations, and makes use of an extensively studied animal. These factors may facilitate investigation of the physiologic effects of minimal access surgery.

Endoscopic in situ occlusion of the cystic duct and ablation of the gallbladder could constitute a useful alternative to cholecystectomy in certain patients. The purpose of this study was to examine the feasibility of endoluminal occlusion of the cystic duct using a biodegradable polyglycolic acid screw and simultaneous gallbladder mucosal ablation with a Sotradecol-ethanol mixture. Eight pigs had operative cholecystotomy. A polyglycolic acid screw was twisted into the cystic duct after the proximal cystic duct mucosa was thermally ablated using electrocautery. Cholecystography confirmed occlusion of the cystic duct. Synchronous ablation of the gallbladder mucosa was then done by instilling absolute alcohol and 2% Sotradecol. The gallbladder was drained. Animals were sacrificed on days 14, 28, and 42. All animals survived operation and showed no untoward effects. Postmortem gross inspection showed gallbladders were shrunken and surrounded with adhesions from adjacent tissue. Cholangiography and cholecystography confirmed occlusion of the cystic duct in 6 of 8 pigs (75%). Histopathologic examination showed extensive areas of mucosal necrosis mixed with small areas of epithelial regeneration. Immediate occlusion of the cystic duct is possible using an endoluminal polyglycolic acid screw.

We report a method of laparoscopic surgery in the rat. Our technique is illustrated by gastric fundoplication requiring two handed dissection, suturing, and knot tying. This animal model for laparoscopic surgery is relatively inexpensive, can be extended to other operations, and makes use of an extensively studied animal. These factors may facilitate investigation of the physiologic effects of minimal access surgery.

Minimally invasive operations such as laparoscopic cholecystectomy appear to result in more rapid recovery of normal function, less physiological disturbance, and presumably less stress to the organism than open operation counterparts. The purpose of this study was to determine the stress response associated with minimally invasive surgery compared to conventional laparotomy. Three groups of pigs underwent general endotracheal anesthesia. The first group had laparoscopic cholecystectomy, the second open cholecystectomy, and the last group (controls) had only general anesthesia. The neuroendocrine serum stress markers adrenocorticotropic hormone (ACTH), cortisol, insulin, and glucagon were measured prior to anesthesia and for the first 3 postoperative days. Analysis of the data showed significant elevations of both ACTH and cortisol for laparoscopic operations as well as for open operation (cortisol only) in the immediate postoperative period. No differences were found for the other serum stress markers. We conclude that minimally invasive surgery in this porcine model confers no advantage, as measured by four neuroendocrine stress hormones, over conventional surgery. Further study is required to determine the clinical implication of these findings.

Background: Endoscopic sclerotherapy is an accepted treatment for bleeding esophageal varices, but it is associated with substantial local and systemic complications. Endoscopic ligation, a new form of endoscopic treatment for bleeding varices, may be safer. We compared the effectiveness and safety of the two techniques., Methods: In this randomized trial we compared endoscopic sclerotherapy and endoscopic ligation in 129 patients with cirrhosis who had proved bleeding from esophageal varices. Sixty-five patients were treated with sclerotherapy, and 64 with ligation. Initial treatment for acute bleeding was followed by elective retreatment to eradicate varices. The patients were followed for a mean of 10 months, during which we determined the incidence of complications and recurrences of bleeding, the number of treatments needed to eradicate varices, and survival., Results: Active bleeding at the first treatment was controlled by sclerotherapy in 10 of 13 patients (77 percent) and by ligation in 12 of 14 patients (86 percent). Slightly more sclerotherapy-treated patients had recurrent hemorrhage during the study (48 percent vs. 36 percent for the ligation-treated patients, P = 0.072). The eradication of varices required a lower mean (+/- SD) number of treatments with ligation (4 +/- 2 vs. 5 +/- 2, P = 0.056) than with sclerotherapy. The mortality rate was significantly higher in the sclerotherapy group (45 percent vs. 28 percent, P = 0.041), as was the rate of complications (22 percent vs. 2 percent, P less than 0.001). The complications of sclerotherapy were predominantly esophageal strictures, pneumonias, and other infections., Conclusions: Patients with cirrhosis who have bleeding esophageal varices have fewer treatment-related complications and better survival rates when they are treated by esophageal ligation than when they are treated by sclerotherapy.

Endoscopic variceal ligation (EVL) was developed as an alternative to endoscopic variceal sclerosis (ES) because of the high complication rate seen with ES. The new technique involves placement of small elastic bands around the variceal channels in the distal esophagus. The first 146 consecutive patients treated with EVL during the period from August, 1986 to July, 1989 are reported. Portal hypertension was caused by alcoholic liver disease in 93 of these patients. The average age of the patients was 53 years and 66% were males. All of the patients had recently bled from esophageal varices. At the time of treatment, 23% of the patients were actively bleeding. They were all treated acutely with EVL and had repeated treatments with the long-term goal of variceal eradication. The overall survival was 73%. Varices were eradicated or reduced to grade one in 78% of the 125 patients who were followed for more than 30 days. Variceal eradication required a mean of 5.5 sessions. Recurrent bleeding occurred in 44% of the total patient population. There were no major complications from EVL. It is concluded from this non-randomized experience that EVL is an effective treatment for bleeding esophageal varices and that it appears to be as effective as sclerotherapy with fewer complications.

Endoscopic variceal ligation was developed to provide a safe alternative to conventional injection sclerotherapy which is known to be associated with a substantial incidence of non-bleeding treatment related complications. Laboratory studies in portal hypertensive dogs have shown the technique results in obliteration of vascular structures in the submucosa by scar tissue formation. The clinical technique of endoscopic ligation is performed in the endoscopy suite or intensive care unit in a fashion similar to endoscopic sclerotherapy except an endoscopic overtube is routinely employed. Initial single arm trials of endoscopic ligation in 146 consecutive patients showed the technique to be effective for control of active bleeding and eradication of varices while being associated with a low incidence of non-bleeding complications. Endoscopic ligation has been investigated in three additional single arm trials and is currently under investigation in three prospective randomized studies comparing the technique with sclerotherapy. Data from these studies have confirmed that endoscopic ligation is at least equal to sclerotherapy for treatment of actively bleeding varices and prevention of recurrent bleeding. The new technique appears to result in a significantly lower risk of non-bleeding treatment related complications than conventional sclerotherapy.

Thirty-four patients with suspected common bile duct stones were randomized to undergo endoscopic cholangiography and stone removal prior to open cholecystectomy or to have open cholecystectomy, operative cholangiography, and common bile duct exploration. Sixteen underwent the first protocol, and 18 the second. Analysis of the ability to clear stones from the common bile duct, morbidity, mortality, hospital stay, length of operation, and hospital cost showed no difference in outcome between patients treated by either method. These data suggest there is neither an advantage nor a disadvantage to treating patients with suspected duct stones by precholecystectomy endoscopic cholangiography and stone removal.