Use of artificial intelligence for decision-support to avoid high-risk behaviors during laparoscopic cholecystectomy.

INTRODUCTION: Bile duct injuries (BDIs) are a significant source of morbidity among patients undergoing laparoscopic cholecystectomy (LC). GoNoGoNet is an artificial intelligence (AI) algorithm that has been developed and validated to identify safe ("Go") and dangerous ("No-Go") zones of dissection during LC, with the potential to prevent BDIs through real-time intraoperative decision-support. This study evaluates GoNoGoNet's ability to predict Go/No-Go zones during LCs with BDIs. METHODS AND PROCEDURES: Eleven LC videos with BDI (BDI group) were annotated by GoNoGoNet. All tool-tissue interactions, including the one that caused the BDI, were characterized in relation to the algorithm's predicted location of Go/No-Go zones. These were compared to another 11 LC videos with cholecystitis (control group) deemed to represent "safe cholecystectomy" by experts. The probability threshold of GoNoGoNet annotations were then modulated to determine its relationship to Go/No-Go predictions. Data is shown as % difference [99% confidence interval]. RESULTS: Compared to control, the BDI group showed significantly greater proportion of sharp dissection (+ 23.5% [20.0-27.0]), blunt dissection (+ 32.1% [27.2-37.0]), and total interactions (+ 33.6% [31.0-36.2]) outside of the Go zone. Among injury-causing interactions, 4 (36%) were in the No-Go zone, 2 (18%) were in the Go zone, and 5 (45%) were outside both zones, after maximizing the probability threshold of the Go algorithm. CONCLUSION: AI has potential to detect unsafe dissection and prevent BDIs through real-time intraoperative decision-support. More work is needed to determine how to optimize integration of this technology into the operating room workflow and adoption by end-users.

Closed incision negative pressure wound therapy following pancreaticoduodenectomy for prevention of surgical site infections in high-risk patients.

BACKGROUND: Surgical site infection (SSI) is one of the most common sources of morbidity after pancreaticoduodenectomy. Surgical site infections are associated with readmissions, prolonged length of stay, delayed initiation of adjuvant chemotherapy and negative effects on quality of life. Incisional vacuum-assisted closure (iVAC) devices applied on closed incisions may reduce SSI rates. The objective of this retrospective review is to evaluate the impact of iVAC on SSI rate after pancreaticoduodenectomy. METHODS: A cohort of patients undergoing pancreaticoduodenectomy at a single institution who had at least 1 risk factor for SSI and who received an iVAC were compared with a historical cohort of high-risk patients who received conventional dressings after pancreaticoduodenectomy. The primary outcome was incidence of SSI within 30 days, abstracted from chart review. Secondary outcomes were 30-day readmission, 90-day mortality, rate of postoperative pancreatic fistula and rate of delayed gastric emptying. RESULTS: In total, 175 patients were included, of whom 61 received an iVAC. The incidence of SSI was 13% (8 of 61 patients) and 16% (18 of 114 patients) in the iVAC and conventional dressing groups, respectively (odds ratio 0.81, 95% confidence interval 0.33-1.98). Preoperative biliary drainage was the most frequent SSI risk factor. Binary logistic regression using SSI as the outcome demonstrated no significant association with iVAC use when adjusted for SSI risk factors. There were no differences in rates of postoperative pancreatic fistula, delayed gastric emptying or 90-day mortality. CONCLUSION: This report describes the outcomes of the integration of iVAC devices into routine clinical practice at a high-volume institution. Application of this device after pancreaticoduodenectomy for patients at elevated risk of SSI was not associated with a reduction in the rate of SSIs.

Comparing the Warshaw technique with vessel-preservation in laparoscopic spleen preserving distal pancreatectomy: is there a better approach?

BACKGROUND: Laparoscopic spleen-preserving distal pancreatectomy (LSPDP) can be accomplished with either resection of the splenic vessels via the Warshaw Technique (WT) or via preservation of the splenic vessels (SVP). Our study aims to compare outcomes for the two methods of LSPDP. METHODS: We performed a retrospective chart review with intent-to-treat analysis of adults undergoing LSPDP at a single institution from 2009 to 2021. We compared demographic characteristics, operative parameters, oncologic pathology review, and postoperative outcomes. RESULTS: There were 102 consecutive cases of LSPDP (59 WT, 43 SVP) over 12 years. The rate of successful spleen preservation was not significantly different between the two groups (76.3%WT, 65.1%VSP,p = 0.27). Rates of conversion to laparotomy, postoperative complications including pancreatic fistulas and splenic infarcts and amount of intraoperative blood loss were similar between the groups. Median operative time was significantly shorter with the WT (141 vs. 177 min, p < 0.05). The median length of stay in hospital was not significantly different among the groups. CONCLUSION: Both techniques are safe and effective in preserving the spleen in laparoscopic distal pancreatectomy. Our experience suggests that the Warshaw Technique may be more efficient with respect to the use of limited operative resources.

The inferior boundary of dissection as a novel landmark for safe laparoscopic cholecystectomy.

BACKGROUND: Since the introduction of laparoscopic cholecystectomy over 30 years ago, rates of bile duct injury have remained elevated compared to the era of open cholecystectomy. We propose an anatomical landmark, the Inferior Boundary of Dissection, to help prevent dangerous dissection in the porta hepatis and provide clues as to when a critical view of safety may not be immediately achieved. METHODS: This landmarking approach is based on fundamentals of biliary anatomy and surface landmarks of the liver. RESULTS: The 'Boundary' extends from Rouviere's sulcus to the junction of the peritoneum and fat overlying the cystic and hilar plates, near the base of segment 4. This anatomic landmark represents the lower boundary for safe dissection, by outlining the location of the biliary pedicles. CONCLUSION: The two points of reference are reliable surface landmarks with predictable and consistent relationships to the biliary pedicles. It also serves as a line above which the gallbladder can be opened or mobilized in a 'top-around' approach, facilitating subtotal cholecystectomy when the hepatocystic triangle appears hostile due to inflammation. The landmark has been well-received in our region as a facile instrument for safe cholecystectomy and we advocate for its broader use.

Critical appraisal of predictive tools to assess the difficulty of laparoscopic liver resection: a systematic review.

BACKGROUND: Objective assessment of the difficulty of laparoscopic liver resection (LLR) preoperatively is key in improving its uptake. Difficulty scores are proposed but are not used routinely in practice. We identified and appraised predictive models to estimate LLR difficulty. METHODS: We systematically searched the literature for tools predicting LLR difficulty. Two independent reviewers selected studies, abstracted data and assessed methodology. We evaluated tools' quality and clinical relevance using the Critical Appraisal and Data Extraction for Systematic Reviews of Prediction Modelling Studies (CHARMS) guidelines. RESULTS: From 1037 citations, we included 8 studies reporting on 4 predictive tools using data from 1995 to 2016 in Asia and Europe. In 4 development studies, tools were designed to predict difficulty as assigned by experts using a 10-level difficulty index, operative time, post-operative morbidity or intra-operative complications. Internal validation and performance metrics were reported in one development study. One tool was subjected to external validations in 4 studies (1 independent and geographic). Validations compared post-operative outcomes (operative time, blood loss, transfusion, major morbidity and conversion) between the risk categories. One study validated discrimination (AUROC 0.53). Calibration was not assessed. CONCLUSION: Existing tools cannot be used confidently to predict LLR difficulty. Consistent objective clinical outcomes to predict to define LLR difficulty should be established, and better-quality tools developed and validated in a wide array of populations and clinical settings, following best practices for predictive tools development and validation. This will improve risk stratification for future trials and uptake of LLR.

Safe laparoscopic subtotal cholecystectomy in the face of severe inflammation in the cystohepatic triangle: a retrospective review and proposed management strategy for the difficult gallbladder

Background: Laparoscopic subtotal cholecystectomy (LSC) can be employed when extensive fibrosis or inflammation of the cystohepatic triangle prohibits safe dissection of the cystic duct and artery. The purpose of this study was to compare postoperative outcomes in patients with severe cholecystitis who underwent laparoscopic cholecystectomy (LC) or LSC. Methods: In this retrospective study, we compared the postoperative outcomes of patients with severe cholecystitis who underwent LC or LSC between July 2010 and July 2016 at St. Joseph's Health Centre, Toronto. We further stratified LSC cases on the basis of the extent of gallbladder (GB) dissection and GB remnant closure. Results: A total of 105 patients who underwent LC and 46 who underwent LSC were included in the study. There were 4 bile duct injuries in the LC group and 0 in the LSC group. Bile leaks (relative risk [RR] 3.4, 95% confidence interval [CI] 1.01­11.5) and subphrenic collections (RR 3.1, 95% CI 1.3­8.0) were more common in the LSC group. Overall postoperative morbidity did not differ significantly between the 2 groups. Postoperative endoscopic retrograde cholangiopancreatography (ERCP) (RR 3.2, 95% CI 1.1­9.5) and biliary stent insertion (RR 4.6, 95% CI 1.2­17.5) were more common in the LSC group. Bile leaks appeared to be more prominent with open GB remnants but all cases of leak were successfully managed with ERCP and biliary stenting. Conclusion: LSC may mitigate the risk of bile duct injury when dissection into the cystohepatic triangle is unsafe. There were more bile leaks in patients who underwent LSC; however, they were readily managed with endoscopic stents. Long-term biliary fistulae were not observed. LSC should be considered early as a means of completing difficult cholecystectomies safely without the need for cholecystostomy tube or conversion to laparotomy.

Contexte: La cholécystectomie laparoscopique subtotale (CLS) peut être utilisée si une fibrose ou une inflammation étendue du triangle cystohépatique empêche l'ablation sécuritaire du canal et de l'artère cystiques. Cette étude avait pour but de comparer les résultats postopératoires chez des patients atteints de cholécystite grave ayant subi une cholécystectomie laparoscopique (CL) ou une CLS. Méthodes: Dans cette étude rétrospective, nous avons comparé les résultats postopératoires des patients atteints de cholécystite grave ayant subi une CL ou une CSL entre juillet 2010 et juillet 2016 au St. Joseph's Health Centre de Toronto. Nous avons ensuite stratifié les cas de CSL selon la proportion de la vésicule biliaire excisée et la suture du reliquat. Résultats: En tout, 105 patients ayant subi une CL et 46 une CLS ont été inclus dans l'étude. On a dénombré 4 lésions du canal cholédoque dans le groupe CL et 0 dans le groupe CLS. Les fuites biliaires (risque relatif [RR] 3,4, intervalle de confiance [IC] de 95 % 1,01­ 11,5) et les collections sous-diaphragmatiques (RR 3,1, IC de 95 % 1,3­8,0) ont été plus fréquentes dans le groupe CSL. Globalement, la morbidité postopératoire n'a pas été significativement différente entre les 2 groupes. La cholangiopancréatographie rétrograde endoscopique (CPRE) postopératoire (RR 3,2, IC de 95 % 1,1­9,5) et la pose d'une endoprothèse biliaire (RR 4,6, IC de 95 % 1,2­17,5) ont été plus fréquentes dans le groupe CLS. Les fuites biliaires ont semblé plus marquées en l'absence de suture des reliquats, mais tous les cas de fuite ont été traités avec succès par CPRE et endoprothèse biliaire. Conclusion: La CLS pourrait atténuer le risque de lésion du canal cholédoque lorsqu'il est contre-indiqué d'intervenir au niveau du triangle cystohépatique. On a observé plus de fuites biliaires chez les patients soumis à la CLS; par contre, ces fuites ont rapidement été corrigées à l'aide d'endoprothèses. Aucune fistule biliaire n'a été observée à long terme. La CLS devrait être envisagé sans tarder pour finaliser sécuritairement les cholécystectomies compliquées sans recourir au drain de cholécystostomie ou à conversion en laparotomie.

Laparoscopic colectomy: trends in implementation in Canada and globally

Summary: Comparisons with other high-income countries suggest that Canada has been slower to adopt laparoscopic colectomy (LC). The Canadian Association of General Surgeons sought to evaluate the barriers to adoption of laparoscopic colon surgery and to propose potential intervention strategies to enhance the use of the procedure. Given the clinical benefits of laparoscopic surgery for patients, the increasing needs for surgical care and the desire of Canadian general surgeons to advance their specialty and enhance the care of their patients, it is an important priority to improve the utilization of LC.

Patient blood management for liver resection: consensus statements using Delphi methodology.

BACKGROUND: Blood loss and transfusion remain a significant concern in liver resection (LR). Patient blood management (PBM) programs reduce use of transfusions and improve outcomes and costs, but are not standardized for LR. This study sought to create an expert consensus statement on PBM for LR using modified Delphi methodology. METHODS: An expert panel representing hepato-biliary surgery, anesthesiology, and transfusion medicine was invited to participate. 28 statements addressing the 3 pillars of PBM were created. Panelists were asked to rate statements on a 7-point Likert scale. Three-rounds of iterative rating and feedback were completed anonymously, followed by an in-person meeting. Consensus was reached with at least 70% agreement. RESULTS: The 35 experts panel recommended routine pre-operative transfusion risk assessment, and investigation and management of anemia with iron supplementation. Intra-operatively, restrictive fluid administration without routine central line insertion was recommended, along with intermittent hepatic pedicle occlusion and surgical techniques considerations. Specific criteria for restrictive intra-operative and post-operative transfusion strategy were recommended. CONCLUSIONS: PBM for LR included medical and technical interventions throughout the perioperative continuum, addressing specificities of LR. Diffusion and adoption of these recommendations can standardize PBM for LR to improve patient outcomes and resource utilization.

Role for laparoscopy in the management of bile duct injuries.

Common bile duct (CBD) injury is the most serious complication of laparoscopic cholecystectomy. Recently, laparoscopic techniques have been used in the management of postoperative bile leak and CBD injury; this literature has not been reviewed. We reviewed the literature on CBD injury, the approach to its diagnosis and management, and reports of laparoscopic management techniques. We combined this review with our experience in laparoscopic methods to highlight diagnostic and therapeutic options. Laparoscopic techniques can be used to prevent, diagnose and treat CBD injuries. Intraoperatively, CBD injury can be prevented in the case of short cystic duct with the use of a loop ligature or transfixing suture, and it can be diagnosed using intraoperative cholangiography or other visualization techniques. When CBD injury is suspected postoperatively, repeat laparoscopy can be used to control sepsis with abdominal washout; as a diagnostic tool to guide management; and, in some settings, as a therapeutic tool for suturing small duct leaks, drain insertion and postoperative endoscopic retrograde cholangiopancreatography with sphincterotomy. Definitive laparoscopic repair is possible when certain criteria are met. Open surgery should be considered when the CBD is small, the injury occurred more than 72 hours previously, injury or anatomy are complex, port positioning is awkward for repair, or local experience is limited with laparoscopic management. There is an emerging role for laparoscopy in the management of CBD injuries. More case reports and series are needed to show the safety and efficacy of this technique, encourage its wider adoption, and allow outcomes assessment on a larger scale.

La lésion du canal cholédoque est la plus grave complication de la cholécystectomie laparoscopique. Récemment, des techniques laparoscopiques ont été utilisées pour traiter les fuites biliaires postopératoires et les lésions du canal cholédoque; la littérature à ce sujet n'a pas été passée en revue. Nous avons donc entrepris de faire une revue de la littérature publiée sur les lésions du canal cholédoque, les approches diagnostiques et thérapeutiques les concernant, ainsi que des rapports sur les approches thérapeutiques laparoscopiques. Nous avons combiné cette revue à notre expérience des méthodes laparoscopiques pour mettre en lumière les options diagnostiques et thérapeutiques. Il est possible d'utiliser des techniques laparoscopiques pour prévenir, diagnostiquer et traiter les lésions du canal cholédoque. Durant une intervention, on peut prévenir la lésion du canal cholédoque, dans le cas d'un canal cystique court, en recourant à des boucles de fil préformées ou à des sutures par transfixion; et la lésion peut être diagnostiquée par cholangiographie ou autre technique d'imagerie peropératoires. Lorsqu'on soupçonne une lésion du canal cholédoque en postopératoire, on peut répéter la laparoscopie pour vérifier la présence d'infection et procéder à un lavage abdominal, comme outil diagnostique pour guider le traitement et, dans certains contextes, comme outil thérapeutique pour suturer de petites fuites du canal cystique, insérer un drain ou procéder à une cholangiopancréatographie rétrograde endoscopique postopératoire avec sphinctérotomie. Il est possible de procéder à une réparation laparoscopique définitive en présence de certains critères. On envisagera la chirurgie ouverte si le canal cholédoque est petit, la lésion s'est produite plus de 72 heures auparavant, la lésion ou les caractéristiques anatomiques sont complexes, la réparation est rendue difficile par le positionnement du cathéter ou l'équipe locale a une expérience limitée du traitement laparoscopique. On constate le rôle émergent de la laparoscopie pour la prise en charge des lésions du canal cholédoque. Il faudra davantage de rapports et de séries de cas pour en démontrer l'innocuité et l'efficacité, en encourager l'utilisation plus répandue et permettre une évaluation de ses résultats à plus grande échelle.

A survey of current practices and barriers to expanding laparoscopic HPB surgery in Canada.

BACKGROUND: The purpose of this survey was to determine the extent to which laparoscopy is used in hepatopancreatobiliary (HPB) resections in Canada, and to assess HPB surgeons' attitudes and their perceived barriers to its further adoption. METHODS: Using an electronic questionnaire, 68 Canadian Hepatopancreatobiliary Association (CHPBA) surgical members were surveyed. The questionnaire consisted of 12 questions regarding: surgeon demographics, the use and limitations of laparoscopy in their practice, and interest in increasing the use of laparoscopic techniques. RESULTS: The survey response rate was 75%. Of the 51 respondents, 86% reported performing minor laparoscopic resections such as hepatic wedge resections. Only 23% of surgeons reported performing laparoscopic liver lobectomies. Eighty-two percent of respondents indicated a wish to increase the use of laparoscopy in their practice. Barriers identified included operating time constraints (61%), a lack of equipment (41%) and lack of adequate training (43%). DISCUSSION: This survey demonstrates that currently, most Canadian HPB surgeons use laparoscopy for minor HPB resections; however, there is a strong desire to expand the use of minimally invasive techniques amongst Canadian HPB surgeons. Training centered on addressing the limitations and barriers to the uptake of minimally invasive techniques in HPB surgery are needed.

Lateral approach in laparoscopic distal pancreatectomy is safe and potentially beneficial compared to the traditional medial approach.

INTRODUCTION: Laparoscopic distal pancreatectomy has become widely accepted for the treatment of left-sided pancreatic lesions. Traditionally, a medial laparoscopic distal pancreatectomy (MDLP) has been employed, with division of the gland followed by medial to lateral mobilization. Recent technical reports of lateral laparoscopic distal pancreatectomy (LLDP) suggest that it offers easier access and more precise dissection. Data on this technique remain sparse and inconclusive, with no formal comparison with MLDP. We sought to compare outcomes of LLDP to MLDP. METHODS: We reviewed the charts of patients undergoing laparoscopic distal pancreatectomy at two academic institutions, from July 2009 to June 2013. Primary outcomes were operating time and estimated blood loss. Secondary outcomes included success of spleen-preserving procedures, length of sacrificed pancreas parenchyma, margins status, 30-day major morbidity (Clavien grade 3-5 complications), and length of stay. We reported data as proportions and medians. We performed comparative analysis using Chi square test or Fisher's exact test for categorical variables, and Mann-Whitney U test for continuous variables. RESULTS: We retrieved 43 cases (19 LLDP, 24 MLDP). Median operative time was shorter (166 vs 190 min; p = 0.03) and estimated blood loss lower (50 vs 250 mL; p < 0.01) with LLDP. No margin was positive with LLDP compared to 2 (8.3%) with MLDP. Major morbidity did not differ (LLDP 21.0% vs MLDP 25.0%; p = 0.76). Trends toward lower conversion rate (16.7 vs 5.3%; p = 0.36) and shorter length of stay (5 vs 4 days; p = 0.35) were not significant. CONCLUSION: LLDP is a feasible and safe approach for distal lesions of the pancreatic tail, associated with shorter operative time and decreased blood loss compared to traditional MLDP. Potential of decreased conversion rate and length of stay exists. These hypotheses need to be confirmed in larger prospective studies.

Starting a new laparoscopic liver surgery program: initial experience and improved efficiency.

BACKGROUND: Owing to the anatomic complexity of the liver and the risk of hemorrhage, most liver resections are still performed using an open procedure. We evaluated the outcomes of introducing a laparoscopic liver program to a community teaching hospital. METHODS: We retrospectively reviewed laparoscopic liver resections performed between August 2010 and July 2013 at St. Joseph's Health Centre in Toronto. The primary outcomes were mortality, major morbidity and negative margins. Secondary outcomes included other perioperative outcomes. We used nonparametric tests to compare the outcomes during the first (group A) and second (group B) halves of the study period. RESULTS: Group A included 19 patients and group B had 25 patients; 9 and 4 patients, respectively, had major resections. Group A had the only death due to liver failure. There was no difference in major complications (10.6% v. 16%) or length of stay (4.5 v. 4.6 d) between the groups. One patient in group B had a positive margin. There was a significant decrease in duration of surgery (from 237 to 170 min, p = 0.007), with a trend toward shorter duration for major resections (from 318 to 238 min, p = 0.07). Furthermore, more procedures were performed for malignancy in group B than group A (36.8% v. 84.0%, p = 0.001). CONCLUSION: Laparoscopic liver resection can be safely introduced into a Canadian community teaching hospital. Average duration of surgery decreased by 67 minutes despite a 2-fold increase in the number of cases performed for malignancy.

CONTEXTE: En raison de la complexité anatomique du foie et du risque d'hémorragie, la plupart des résections hépatiques s'effectuent encore par chirurgie ouverte. Nous avons évalué les résultats d'un programme hépatique laparoscopique instauré dans un hôpital d'enseignement communautaire. MÉTHODES: Nous avons passé en revue de manière rétrospective les résections hépatiques laparoscopiques effectuées entre août 2010 et juillet 2013 au St. Joseph's Health Centre de Toronto. Les paramètres principaux étaient la mortalité, la morbidité majeure et les marges négatives. Les paramètres secondaires incluaient d'autres variables périopératoires. Nous avons utilisé des tests non paramétriques pour comparer les variables durant la première moitié (groupe A) et la seconde moitié (groupe B) de la période de l'étude. RÉSULTANTS: Le groupe A incluait 19 patients et le groupe B, 25 patients; 9 et 4 patients, respectivement, ont subi des résections majeures. Le groupe A a enregistré le seul décès attribuable à une insuffisance hépatique. On n'a noté aucune différence quant aux complications majeures (10,6 % c. 16 %) ou quant à la durée de l'hospitalisation (4,5 c. 4,6 jours) entre les groupes. Un patient du groupe B a présenté une marge positive. On a noté en général une diminution significative de la durée de l'intervention (de 237 à 170 minutes, p = 0,007); dans le cas des résections majeures, on a noté une tendance à la diminution de la durée de l'intervention (de 318 à 238 minutes, p = 0,07). En outre, un plus grand nombre d'interventions ont été effectuées pour des cas de cancer dans le groupe B que dans le groupe A (36,8 % c. 84,0 %, p = 0,001). CONCLUSION: La résection hépatique laparoscopique peut être pratiquée de manière sécuritaire dans un hôpital d'enseignement communautaire canadien. La durée moyenne des interventions a diminué de 67 minutes, malgré une augmentation du double du nombre d'interventions effectuées pour des cas de cancer.

Intraoperative ultrasonography and surgical strategy in hepatic resection: What difference does it make?

BACKGROUND: With modern advancements in preoperative imaging for liver surgery, intraoperative ultrasonography (IOUS) may be perceived as superfluous. Our aim was to determine if IOUS provides new information that changes surgical strategy in hepatic resection. METHODS: We retrospectively analyzed 121 consecutive liver resections performed at a single institution. Preoperative computed tomography and/or magnetic resonance imaging determined the initial surgical strategy. The size, location and number of lesions were compared between IOUS and preoperative imaging. Reviewing the operative report helped determine if new IOUS findings led to changes in surgical strategy. Pathology reports were analyzed for margins. RESULTS: Of 121 procedures analyzed, IOUS was used in 88. It changed the surgical plan in 15 (17%) cases. Additional tumours were detected in 10 (11%) patients. A change in tumour size and location were detected in 2 (2%) and 3 (4%) patients, respectively. Surgical plans were altered in 7 (8%) cases for reasons not related to IOUS. There was no significant difference (p = 0.74) in average margin length between the IOUS and non-IOUS groups (1.09 ± 1.18 cm v. 1.18 ± 1.05 cm). CONCLUSION: Surgical strategy was altered owing to IOUS results in a substantial number of cases, and IOUS-guided resection planes resulted in R0 resections in nearly all procedures. The best operative plan in hepatic resection includes IOUS.

CONTEXTE: Compte tenu des récentes avancées de l'imagerie préopératoire pour les chirurgies du foie, l'utilisation de l'échographie peropératoire pourrait paraître inutile. Notre objectif était de déterminer si cette pratique permet d'obtenir des images nouvelles motivant un changement de stratégie chirurgicale pendant une résection hépatique. MÉTHODES: Nous avons analysé rétrospectivement 121 résections hépatiques consécutives réalisées dans un même établissement. La tomographie par ordinateur ou l'imagerie par résonance magnétique préopératoires ont été utilisées pour choisir la stratégie chirurgicale initiale. La taille et la position des tumeurs détectées ainsi que leur nombre ont été comparés selon la méthode utilisée : échographie peropératoire ou imagerie préopératoire. Nous avons étudié les rapports opératoires pour déterminer si l'échographie peropératoire avait entraîné un changement de stratégie chirurgicale et avons examiné les rapports de pathologie pour connaître les résultats de l'analyse des contours. RÉSULTATS: L'échographie peropératoire a été utilisée dans 88 des 121 interventions étudiées. Elle a influé sur la stratégie chirurgicale dans 15 cas (17 %). De nouvelles tumeurs ont été détectées chez 10 patients (11 %), et un changement dans la taille ou la position de la tumeur a été détecté chez 2 (2 %) et 3 patients (4 %), respectivement. Dans 7 cas (8 %), la stratégie chirurgicale a été modifiée, mais pour des raisons indépendantes des résultats de l'échographie. Nous n'avons pas observé de différence significative (p = 0,74) entre la taille moyenne des contours pour les 2 groupes de patients, soit ceux qui ont été soumis à l'échographie peropératoire et ceux qui ne l'ont pas été (1,09 ± 1,18 cm par rapport à 1,18 ± 1,05 cm). CONCLUSION: La stratégie chirurgicale a été modifiée en fonction des résultats de l'échographie peropératoire dans un nombre important de cas, et dans presque tous les cas, l'échographie peropératoire a donné lieu à une résection complète. La meilleure approche lors d'une résection hépatique inclut donc l'échographie peropératoire.

Balancing surgical innovation with cost and efficiency.

The standard approach to neoplasia of the pancreatic head is pancreaticoduodenectomy, otherwise known as the Whipple procedure. Traditionally, this operation is performed through an open laparotomy incision. In high-volume centres, and when performed by appropriately qualified surgeons, the Whipple procedure is safe and effective management for diseases of the pancreatic head. Still, this operation remains one of the most complex abdominal procedures. With the proliferation of minimally invasive surgery, more complex operations are being performed using laparoscopy and other minimal access techniques. A group from McGill University and the Montreal Jewish General Hospital have prospectively evaluated their experience with minimally invasive pancreaticoduodenectomy and have compared this experience to the open approach. This is the first comparative series of its kind from Canada.

Defining Standards for Hepatopancreatobiliary Cancer Surgery in Ontario, Canada: A Population-Based Cohort Study of Clinical Outcomes.

BACKGROUND: In 2006, Cancer Care Ontario created Surgical Oncology Standards for the delivery of hepatopancreatobiliary (HPB) surgery including hepatectomy and pancreaticoduodenectomy (PD). Our objective was to identify the impact of standardization on outcomes after HPB surgery in Ontario, Canada. STUDY DESIGN: This study was a population-level analysis of patients undergoing hepatectomy or PD (2003 to 2019). Logistic regression models were used to compare 30- and 90-day mortality and length of stay (LOS) before (2003 to 2006), during (2007 to 2011), and after (2012 to 2019) standardization. Interrupted time series models were used to co-analyze secular trends. RESULTS: A total of 7,904 hepatectomies and 5,238 PDs were performed. More than 80% of all cases were performed at a designated center (DC) before standardization. This increased to >98% in the poststandardization era. Median volumes at DCs increased from 55 to 67 hepatectomies/year and from 22 to 50 PDs/year over time. In addition, 30-day mortality after hepatectomy was 2.6% before standardization and 2.3% after standardization (p = 0.9); 30-day mortality after PD was 3.6% before standardization and 2.4% after standardization (p = 0.1). Multivariable analyses revealed a significant difference in 90-day mortality following PD poststandardization (4.3% vs 6.3%; adjusted odds ratio, 0.7; p = 0.03). Median LOS was shorter for hepatectomy (6 days vs 8 days) and PD (9 days vs 14 days; p < 0.0001) after standardization. Immediate and late effects on mortality and LOS were likely attributable to secular trends, which predated standardization. CONCLUSIONS: Standardization was associated with a higher volume of hepatectomy and PDs with further concentration of care at DCs. Pre-existing quality initiatives may have attenuated the effect of standardization on quality outcomes. Our data highlight the merits of a multifaceted provincial system for enabling consistent access to high quality HPB care throughout a region of 15 million people over a 16-year period.

Laparoscopic subtotal cholecystectomy for the difficult gallbladder: Evolution of technique at a single teaching hospital.

BACKGROUND: We have developed an algorithmic approach to laparoscopic cholecystectomy, including subtotal cholecystectomy, as a bailout strategy when the Critical View of Safety cannot be safely achieved due to significant inflammation and fibrosis of the hepatocystic triangle. METHODS: This is a retrospective cohort study comparing postoperative outcomes in patients with severe cholecystitis who underwent laparoscopic cholecystectomy or laparoscopic subtotal cholecystectomy at St. Joseph's Health Centre from May 2016 to July 2021, as well as against a historical cohort. We further stratified laparoscopic subtotal cholecystectomy cases based on fenestrating or reconstituting subtype. RESULTS: The cohort included a total of 105 patients who underwent laparoscopic cholecystectomy and 31 patients who underwent laparoscopic subtotal cholecystectomy. Bile leaks (25.8% vs 1.0%, relative risk 3.5, 95% confidence interval 3.5-208.4) were more common in the laparoscopic subtotal cholecystectomy group. Postoperative endoscopic retrograde cholangiopancreatography (22.6% vs 3.8%, relative risk 5.9, 95% confidence interval 1.9-18.9) and biliary stent insertion (19.4% vs 1.0%, relative risk 20.3, 95% confidence interval 2.5-162.5) were also more common in the laparoscopic subtotal cholecystectomy group. Bile leaks in laparoscopic subtotal cholecystectomy were only documented in the fenestration subtype, most of which were successfully managed with endoscopic retrograde cholangiopancreatography and biliary stenting. Compared to our previous study of laparoscopic cholecystectomy and subtotal cholecystectomy for severe cholecystitis between 2010 and 2016, there has been a decrease in postoperative laparoscopic cholecystectomy complications, subtotal cholecystectomy cases, and no bile duct injuries. CONCLUSION: Following our algorithmic approach to safe laparoscopic cholecystectomy has helped to prevent bile duct injury. Laparoscopic cholecystectomy remains the gold standard for the management of severe cholecystitis; however, in extreme cases, laparoscopic subtotal cholecystectomy is a safe bailout strategy with manageable morbidity.

Thinking Your Way Through a Difficult Laparoscopic Cholecystectomy: Technique for High-Quality Subtotal Cholecystectomy.

Laparoscopic subtotal cholecystectomy (LSC) is a bailout strategy to prevent bile duct injury in difficult gallbladder cases. It is associated with acceptable morbidity that is readily managed with postoperative interventions. Here we share our techniques for LSC. We begin with landmarking, which includes the line of safety, a theoretical line the sulcus of Rouvière and the junction of the cystic and hilar plates. If the fundus can be grasped, then the gallbladder is dissected off the cystic plate using the top-around approach. The gallbladder is then amputated, creating a short cuff of proximal gallbladder. This cuff can be left patent (2A) or cinched close with an ENDOLOOP (Ethicon) if it is small, ideally less than 1 cm (1A). If the fundus cannot be grasped, then an inverted T incision is made on the anterior gallbladder wall. The longitudinal incision is extended toward the fundus, and the transverse incision is extended superiorly along the cystic plate edge. Two "bunny ears" are developed and ultimately resected to excise the anterior gallbladder wall at an oblique angle while leaving the posterior wall intact (2B). If the remaining cuff is small, then it can be sutured closed against the gallbladder back wall (1B). In the setting of extensive bowel adhesion to the anterior gallbladder, we perform a fundectomy, from which we extend two incisions along the cystic plate to open the gallbladder like a clamshell. Our paper describes and illustrates our St Joseph's Health Centre institutional LSC approach and subtype classification (1A, 1B, 2A, and 2B).

Administrative codes may have limited utility in diagnosing biliary colic in emergency department visits: A validation study.

Backgrounds/Aims: Biliary colic is a common cause of emergency department (ED) visits; however, the natural history of the disease and thus the indications for urgent or scheduled surgery remain unclear. Limitations of previous attempts to elucidate this natural history at a population level are based on the reliance on the identification of biliary colic via administrative codes in isolation. The purpose of our study was to validate the use of International Statistical Classification of Diseases and Related Health Problems codes, 10th Revision, Canadian modification (ICD-10-CA) from ED visits in adequately differentiating patients with biliary colic from those with other biliary diagnoses such as cholecystitis or common bile duct stones. Methods: We performed a retrospective validation study using administrative data from two large academic hospitals in Toronto. We assessed all the patients presenting to the ED between January 1, 2012 and December 31, 2018, assigned ICD-10-CA codes in keeping with uncomplicated biliary colic. The codes were compared to the individually abstracted charts to assess diagnostic agreement. Results: Among the 991 patient charts abstracted, 26.5% were misclassified, corresponding to a positive predictive value of 73% (95% confidence interval 73%-74%). The most frequent reasons for inaccurate diagnoses were a lack of gallstones (49.8%) and acute cholecystitis (27.8%). Conclusions: Our findings suggest that the use of ICD-10 codes as the sole means of identifying biliary colic to the exclusion of other biliary pathologies is prone to moderate inaccuracy. Previous investigations of biliary colic utilizing administrative codes for diagnosis may therefore be prone to unforeseen bias.

Efficacy and safety of extended duration to perioperative thromboprophylaxis with low molecular weight heparin on disease-free survival after surgical resection of colorectal cancer (PERIOP-01): multicentre, open label, randomised controlled trial.

OBJECTIVE: To determine the efficacy and safety of extended duration perioperative thromboprophylaxis by low molecular weight heparin when assessing disease-free survival in patients undergoing resection for colorectal cancer. DESIGN: Multicentre, open label, randomised controlled trial. SETTINGS: 12 hospitals in Quebec and Ontario, Canada, between 25 October 2011 and 31 December 2020. PARTICIPANTS: 614 adults (age ≥18 years) were eligible with pathologically confirmed invasive adenocarcinoma of the colon or rectum, no evidence of metastatic disease, a haemoglobin concentration of ≥8 g/dL, and were scheduled to undergo surgical resection. INTERVENTIONS: Random assignment to extended duration thromboprophylaxis using daily subcutaneous tinzaparin at 4500 IU, beginning at decision to operate and continuing for 56 days postoperatively, compared with in-patient postoperative thromboprophylaxis only. MAIN OUTCOME MEASURES: Primary outcome was disease-free survival at three years, defined as survival without locoregional recurrence, distant metastases, second primary (same cancer), second primary (other cancer), or death. Secondary outcomes included venous thromboembolism, postoperative major bleeding complications, and five year overall survival. Analyses were done in the intention-to-treat population. RESULTS: The trial stopped recruitment prematurely after the interim analysis for futility. The primary outcome occurred in 235 (77%) of 307 patients in the extended duration group and in 243 (79%) of 307 patients in the in-hospital thromboprophylaxis group (hazard ratio 1.1, 95% confidence interval 0.90 to 1.33; P=0.4). Postoperative venous thromboembolism occurred in five patients (2%) in the extended duration group and in four patients (1%) in the in-hospital thromboprophylaxis group (P=0.8). Major surgery related bleeding in the first postoperative week was reported in one person (<1%) in the extended duration and in six people (2%) in the in-hospital thromboprophylaxis group (P=0.1). No difference was noted for overall survival at five years in 272 (89%) patients in the extended duration group and 280 (91%) patients in the in-hospital thromboprophylaxis group (hazard ratio 1.12; 95% confidence interval 0.72 to 1.76; P=0.1). CONCLUSIONS: Extended duration to perioperative anticoagulation with tinzaparin did not improve disease-free survival or overall survival in patients with colorectal cancer undergoing surgical resection compared with in-patient postoperative thromboprophylaxis alone. The incidences of venous thromboembolism and postoperative major bleeding were low and similar between groups. TRIAL REGISTRATION: ClinicalTrials.gov NCT01455831.