Importance of conversion for results obtained with laparoscopic colorectal surgery

A machine learning model to predict the need for conversion of operative approach in patients undergoing colectomy for neoplasm

BACKGROUND

Studies comparing conversion from laparoscopic to open approaches to colectomy have found an association between conversion and morbidity, mortality, and length of stay, suggesting that certain patients may benefit from an open approach "up-front."

AIM

The objective of this study was to use machine learning algorithms to develop a model enabling the prediction of which patients are likely to require conversion.

METHODS AND RESULTS

We used ACS NSQIP data to identify patients undergoing colectomy (2014-2019). We included patients undergoing elective colectomy for colorectal neoplasm via a minimally invasive approach or a converted approach. The outcome of interest was conversion. Variables were included in the model based on their correlation with conversion by logistic regression (p < .05). Two models were used: weighted logistic regression with regularization, and Random Forest classifier. The data was randomly split into training (70%) and test (30%) cohorts, and prediction performance was calculated. 24 327 cases were included (17 028 training, 7299 test). When applied to the test cohort, the models had an accuracy of 0.675 (range 0.65-0.70) in predicting conversion; c-index ranged from 0.62-0.63. This machine learning model achieved a moderate area under the curve and a high negative predictive value, but a low positive predictive value; therefore, this model can predict (with 95% accuracy) whether a colectomy for neoplasm can be successfully completed using a minimally invasive approach.

CONCLUSION

This model can be used to reassure surgeons of the appropriateness of a minimally invasive approach when planning for an elective colectomy.

Robotic-assisted colectomy for right-sided colon cancer: Short-term surgical outcomes of a multi-institutional prospective cohort study in Japan

Background

In Japan, there are no substantial reports on robotic-assisted colectomy because few institutions performed the procedure, as it was not covered by national insurance until March 2022.

Aim

This study aimed to evaluate the safety and feasibility of robotic-assisted colectomy for patients with curatively resectable colon cancer in Japan.

Methods

This multi-institutional, prospective, single-arm, observational study enrolled patients diagnosed with curatively resectable clinical stage I-IIIC colon adenocarcinoma with D2 or D3 lymph node dissection and treated with robotic-assisted colectomy. The primary endpoint was the conversion rate to laparotomy. The non-inferiority of outcomes for robotic-assisted colectomy versus laparoscopic colectomy, which was determined from historical data, was verified.

Results

One hundred patients were registered between July 2019 and March 2022 and underwent robotic-assisted colectomy performed by seven expert surgeons at six institutions. Thirteen patients were excluded because their surgeons had insufficient experience performing robotic-assisted colectomy; therefore, 87 patients were eligible for the primary endpoint analysis. There was no conversion in these 87 patients, and robotic-assisted colectomy was non-inferior to laparoscopic colectomy in terms of conversion rate (90% confidence interval 0-3.38, p = 0.0006). No intraoperative adverse events occurred, and no mortality was observed in a total of 100 patients. The rate of patients with Clavien-Dindo complications grade III or higher was 4%.

Conclusion

This study showed the non-inferiority of the conversion rates between robotic-assisted colectomy and laparoscopic colectomy. Favorable perioperative outcomes also suggest the safety and feasibility of robotic-assisted colectomy.

Minimally Invasive Colorectal Surgery Techniques

Colorectal surgery has witnessed a transformative shift with the advent of minimally invasive techniques, offering patients reduced postoperative discomfort, shorter hospital stays, and accelerated recovery compared to conventional open surgery. This comprehensive review aims to assess the current state of minimally invasive approaches in colorectal surgery, encompassing various techniques such as single-incision laparoscopic surgery, robot-assisted surgery, and conventional laparoscopic surgery. The article meticulously explores the benefits and drawbacks of each technique, delves into the established criteria for their application, delineates cautious circumstances, and analyzes the outcomes of minimally invasive colorectal surgery. Additionally, the integration of virtual reality and augmented reality for surgical planning and training is discussed, shedding light on the future trajectory of this field. Surgeons and researchers striving to enhance patient care and surgical outcomes in colorectal surgery will find this review article an invaluable resource, presenting crucial components of minimally invasive colorectal surgery and paving the way for continued advancements in the field.

Association of hospital volume with conversion to open from minimally invasive colectomy in patients with diverticulitis: A national analysis

BACKGROUND

Despite the known advantages of minimally invasive surgery (MIS) for diverticular disease, the impact of conversions to open (CtO) colectomy remains understudied. The present study used a nationally representative database to characterize risk factors and outcomes associated with CtO in patients with diverticular disease.

METHODS

All elective adult hospitalizations entailing colectomy for diverticulitis were identified in the 2017-2019 Nationwide Readmissions Database. Annual institutional caseloads of MIS and open colectomy were independently tabulated. Restricted cubic splines were utilized to non-linearly estimate the risk-adjusted association between hospital volumes and CtO. Additional regression models were developed to evaluate the association of CtO with outcomes of interest.

RESULTS

Of an estimated 110,281 patients with diverticulitis who met study criteria, 39.3% underwent planned open colectomy, 53.3% completed MIS, and 7.4% had a CtO. Following adjustment, an inverse relationship between hospital MIS volume and risk of CtO was observed. In contrast, increasing hospital open volume was positively associated with greater risk of CtO. On multivariable analysis, CtO was associated with lower odds of mortality (AOR 0.3, p = 0.001) when compared to open approach, and similar risk of mortality when compared to completed MIS (AOR 0.7, p = 0.436).

CONCLUSION

In the present study, institutional MIS volume exhibited inverse correlation with adjusted rates of CtO, independent of open colectomy volume. CtO was associated with decreased rates of mortality compared to planned open approach but equivalence risk relative to completed MIS. Our findings highlight the importance of MIS experience and suggest that MIS may be safely pursued as the initial surgical approach among diverticulitis patients.

Laparoscopic vs. open colectomy for T4 colon cancer: A meta-analysis and trial sequential analysis of prospective observational studies

Background

To evaluate short- and long-term outcomes of laparoscopic colectomy (LC) vs. open colectomy (OC) in patients with T4 colon cancer.

Methods

Three authors independently searched PubMed, Web of Science, Embase, Cochrane Library, and Clinicaltrials.gov for articles before June 3, 2022 to compare the clinical outcomes of T4 colon cancer patients undergoing LC or OC.

Results

This meta-analysis included 7 articles with 1,635 cases. Compared with OC, LC had lesser blood loss, lesser perioperative transfusion, lesser complications, lesser wound infection, and shorter length of hospital stay. Moreover, there was no significant difference between the two groups in terms of 5-year overall survival (5y OS), and 5-year disease-free survival (5y DFS), R0 resection rate, positive resection margin, lymph nodes harvested ≥12, and recurrence. Trial Sequential Analysis (TSA) results suggested that the potential advantages of LC on perioperative transfusion and the comparable oncological outcomes in terms of 5y OS, 5y DFS, lymph nodes harvested ≥12, and R0 resection rate was reliable and no need of further study.

Conclusions

Laparoscopic surgery is safe and feasible in T4 colon cancer in terms of short- and long-term outcomes. TSA results suggested that future studies were not required to evaluate the 5y OS, 5y DFS, R0 resection rate, positive resection margin status, lymph nodes harvested ≥12 and perioperative transfusion differences between LC and OC.

Systematic Review Registration:https://www.crd.york.ac.uk/PROSPERO/, identifier: CRD42022297792.

Post-operative outcomes in patients with locally advanced colon cancer: a comparison of operative approach

INTRODUCTION

Surgeons may choose an open approach to locally advanced colon cancer (LACC) because of the elevated conversion rate (minimally invasive to open) in these patients (resulting in part from a judgment of the technical feasibility of a minimally invasive approach). Poorer outcomes have been suggested in those requiring conversion from a minimal access to an open approach; however, the influence of conversion has not been studied in LACC. We sought to compare perioperative outcomes in patients with T4aN2 colon cancer undergoing minimally invasive surgery (MIS), planned open (PO), and converted (CN) procedures to evaluate the influence of conversion in this subgroup.

METHODS

A retrospective cohort study was conducted using the NSQIP database. Patients with T4aN2 colon cancer undergoing elective resection were included; rectal/unknown tumor location, and T4b disease were excluded (to ensure homogeneity in surgical management). Patients were divided into cohorts based on approach: PO, MIS, and CN. Summary statistics were compared between groups. Multivariable analysis was conducted for mortality and morbidity outcomes.

RESULTS

1286 cases were included (313 PO, 842 MIS, 131 CN); 10.2% underwent conversion. Those undergoing MIS had a shorter length of stay than those undergoing PO or CN (p < 0.0001). On univariable analysis, CN resulted in increased rates of any complication (p < 0.0001). CN also had a greater rate of anastomotic leak (p = 0.0046) and death (p = 0.05). On multivariable analysis, significant predictors of any complication included age, ASA class, M stage, and approach; however, CN did not increase the risk of complication compared with MIS, whereas PO nearly doubled the risk of complication (OR = 1.98, p = 0.0083). The only significant predictor of mortality on multivariable analysis was age (HR = 1.09, p = 0.0002)-approach was not associated with mortality.

CONCLUSION

PO confers the greatest risk of suffering any complication. Surgical approach was not associated with death. Results of our study challenge the notion that conversion is associated with the worst perioperative outcomes and an MIS approach should be considered in patients with LACC.

The impact of obesity on minimally invasive colorectal surgery: A report from the Surgical Care Outcomes Assessment Program collaborative

BACKGROUND

Operating on obese patients can increase case complexity and result in worse outcomes. We described the incremental impact of BMI on morbidity and outcomes of colorectal operations and whether laparoscopic and robotic(MIS) approaches mitigate this morbidity differently.

METHODS

A retrospective cohort of patients undergoing elective colorectal operations in SCOAP was created to examine the association of increasing BMI on surgical outcomes. Additionally, multivariable logistic regression models were constructed.

RESULTS

From 2011 to 2019, 22,863 elective colorectal operations (mean age 62, 55% female) were performed at 42 hospitals. Patients had BMI≥30 in 7576(33%) and BMI≥40 in 1180(5%) of operations. After risk adjustment, BMI≥40 was associated with increased conversions(OR1.57,95%CI1.26-1.96), increased combined adverse events(CAE)(OR1.32,95%CI1.15-1.52), and death(OR2.24, 95%CI1.41-3.55)(all p < 0.01). MIS approaches were each associated with lower CAE(lap OR0.49,95%CI0.46-0.53; robot OR0.42,95%CI0.37-0.47), and death(lap OR0.24,95%CI0.18-0.33; robot OR0.18,95%CI0.10-0.35)(all p < 0.01).

CONCLUSIONS

Severe obesity is associated with increased conversion rates and worse short-term outcomes after colorectal surgery, though this trend is partially mitigated with a minimally invasive approach. These findings support the broad application of MIS for colorectal operations in obese patients.

Minimally Invasive Surgery for Colorectal Cancer

In recent years, minimally invasive surgery for colorectal cancer has seen remarkable improvement. For the laparoscopic surgery for colon cancer, earlier postoperative recovery and reduced hospital stays can be expected compared to those for open surgery. Also, no increase in perioperative morbidity and mortality has been shown. Furthermore, long-term oncological outcomes comparable to open surgery have been obtained. Although laparoscopic surgery for rectal cancer has shown good short-term postoperative outcomes, recent randomized controlled trials could not demonstrate non-inferiority to open surgery with respect to oncological safety. Further studies are required to confirm the impact of robotic surgery on colon and rectal cancer and the appropriate indications for transanal total mesorectal excision for rectal cancer.

Efficient and Safe Method for Splenic Flexure Mobilization in Laparoscopic Left Hemicolectomy: A Propensity Score-weighted Cohort Study

Supplemental Digital Content is available in the text.

Because methods of performing laparoscopic left hemicolectomy differ between surgeons, standardizing the procedure is crucial to reduce complications and secure good oncologic outcomes.

Robotic Colorectal Surgery

The role of robotics in colon and rectal surgery has been established as an important and effective tool for the surgeon. Its inherent technologies have provided for increased visualization and ease of dissection in the minimally invasive approach to surgery. The value of the robot is apparent in the more challenging aspects of colon and rectal procedures, including the intracorporeal anastomosis for right colectomies and the low pelvic dissection for benign and malignant diseases.

Robotic colectomy with intracorporeal anastomosis is feasible with no operative conversions during the learning curve for an experienced laparoscopic surgeon developing a robotics program

The benefits of performing a colectomy robotically instead of laparoscopically have not conclusively been demonstrated. Evaluation of studies is limited by sample size, retrospective design, heterogeneity of operative techniques, sparse adjustment for learning curve, and mixed results. Consequently, adoption of robotic colectomy by surgeons has been expectedly slow. The objectives of the study were to compare the outcomes of robotic colectomy to laparoscopic colectomy for patients with right-sided tumors undergoing a standardized completely intracorporeal operation and to examine the impact of prior experience with laparoscopic right colectomies on the performance of robotic right colectomies. Retrospective review of outcomes of consecutive patients undergoing a robotic right colectomy (robot) compared to those undergoing laparoscopic colectomy (LAP). LAP patients were further subdivided into a group during the learning curve (LC) and after the learning curve (post-LC). Data collected included operative time (OT), conversion to laparotomy, lymph nodes harvested (LN), length of stay (LOS), 30-day morbidity, and mortality. Comparison of continuous and categorical variables was assessed with the independent samples t test and Chi-square test, respectively. Data are expressed as mean ± SD, and significance defined as p < 0.05. 122 patients underwent robot (n = 21), LAP (n = 101), LC (n = 51), or post-LC (n = 50). OT was decreased for post-LC compared to LC (198 vs. 228 min). There were no conversions in robot and five with LAP. Morbidity was similar for robot (14%) compared to LAP (22%), LC (24%), or post-LC cases (20%). Median LOS was similar for robot vs. LAP (3 vs. 5 days). Robot had greater mean LN yield vs. LAP (19 vs. 14, p = 0.02). The initial outcomes with completely intracorporeal colectomy achieved robotically were equivalent to results during or after LC for laparoscopic resection. Proficiency gained with LAP seems to positively impact the initial results with the robot.

Laparoscopic treatment of rectal cancer and lateral pelvic lymph node dissection: are they obsolete?

Laparoscopic surgery for rectal cancer offers favorable short-term results without compromising long term oncological outcomes so far, according to the data from major trials. For this reason, it is currently considered as a standard option for rectal cancer surgery. The learning curve of laparoscopic rectal cancer surgery is generally longer compared to colon cancer. Appropriate standardization and training of laparoscopic rectal cancer surgery is required. Several RCTs suggested the potential negative effect on quality of resected specimen, which can increase local recurrence. The long-term outcomes - especially local recurrence rate - of these RCTs are awaited. Lateral pelvic lymph node dissection (LPLND) has a certain effect of reducing local recurrence of rectal cancer even after neoadjuvant radiotherapy. Since LPLND is associated with postoperative morbidity, we should carefully select the candidate to maximize the effect of LPLND and minimize the morbidity caused by LPLND. Recent advancements in imaging study such as CT and MRI enable us to find the suitable candidates for LPLND. The morbidity caused by LPLND could be reduced by minimally invasive surgeries such as laparoscopic surgery and robotic surgery. We have to improve oncological outcomes and reduce morbidity by the multidisciplinary strategy for rectal cancer including total mesorectal excision, neoadjuvant chemoradiotherapy and LPLND together with laparoscopic surgery.

Comparison between laparoscopic and open Hartmann's reversal: results of a decade-long multicenter retrospective study

BACKGROUND

Hartmann's reversal is a challenging surgical procedure with significant postoperative morbidity rates. Various surgical methods have been suggested to lower the risk of postoperative complications. In this study, we aimed to compare the postoperative results between open and laparoscopic techniques for Hartmann's reversal.

METHODS

A retrospective study of all patients who underwent Hartmann's reversal in five centers in central Israel between January 2004 and June 2015 was conducted. Medical charts were reviewed, analyzing preoperative and operative parameters and short-term postoperative outcomes.

RESULTS

260 patients were included in the study. 76 patients were operated laparoscopically with a conversion rate of 26.3% (20 patients). No differences were found between patients operated laparoscopically and those operated in an open technique regarding gender (p = 0.785), age (61.34 vs. 62.64, p = 0.521), body mass index (26.6 vs. 26.2, p = 0.948), Charlson index score (1.79 vs. 1.95, p = 0.667), and cause for Hartmann's procedure (neoplastic vs. non-neoplastic, p = 0.644). No differences were seen in average time from the Hartmann's procedure to reversal (204.89 vs. 213.60 days, p = 0.688) and in overall complication rate (46.4 vs. 46.5%, p = 1). The Clavien-Dindo score for distinguishing between minor (0-2 score, p = 1) and major complications (3-5 score, p = 0.675) failed to demonstrate an advantage to laparoscopy, as well as to average length of stay (10.91 days in the laparoscopic group vs. 11.72 days in the open group, p = 0.529). An analysis based on the intention-to-treat with laparoscopy, including converted cases in the laparoscopic group, showed similar results, including overall complication rate (48.6 vs. 45.6%, p = 0.68) and Clavien-Dindo score in both minor (p = 0.24) and major complications (p = 0.44). Length of stay (10.92 vs. 11.81 days, p = 0.45) was also similar between the two groups.

CONCLUSION

In this series, a laparoscopic approach to Hartmann's reversal did not offer any short-term advantage when compared to an open surgical approach.

Laparoscopic Redo Ileocolic Resection for Crohn's Disease in Patients with Previous Multiple Laparotomies

PURPOSES:

Over 80% of patients with primary ileocolic Crohn's disease have a surgical resection within 10 years of diagnosis, and 40%-50% of them need further surgery within 15 years. Laparoscopic surgery can be challenging due to a thickened mesentery and the potential for fistulas, abscesses, and phlegmons. Aim of this study is to analyze the short-term outcomes of laparoscopic redo ileocolic resections for Crohn's disease in patients with previous multiple laparotomies.

METHODS:

All patients undergoing laparoscopic surgery for ileocolic Crohn's disease from March 2006 to February 2017 were prospectively evaluated. Short term outcomes of laparoscopic ileocolic resection were compared between patients with previous multiple major surgeries and recurrent Crohn's disease, and patients undergoing surgery for the first presentation of Crohn's disease and no history of previous surgery. Conversion rate and 30-day morbidity were the primary outcomes. Reoperations, readmissions, operating time and length of stay were the secondary outcomes.

RESULTS:

29 patients with recurrent Crohn's disease and previous multiple laparotomies were included: the number of laparotomies these patients previously underwent was 2 in 19 cases (65.5%), 3 in 9 (31%), and 4 in 1 (3.5%). In total, 90 patients with no history of any previous abdominal surgery, who underwent laparoscopic ileocecal resection for Crohn's disease, represented the control group. No differences were found in morbidity and conversion rate. Operating time was longer in patients with history of previous abdominal surgery.

CONCLUSION:

Laparoscopic redo ileocolic resection for Crohn's disease is feasible and safe in patients with previous multiple laparotomies at the expense of longer operating time.

Comparison of complication and conversion rates between robotic-assisted and laparoscopic rectal resection for rectal cancer: which patients and providers could benefit most from robotic-assisted surgery?

AIMS

To compare (1) complication and (2) conversion rates to open surgery (OS) from laparoscopic surgery (LS) and robotic-assisted surgery (RA) for rectal cancer patients who underwent rectal resection. (3) To identify patient, physician, and hospital predictors of conversion.

MATERIALS AND METHODS

A US-based database study was conducted utilizing the 2012-2014 Premier Healthcare Data, including rectal cancer patients ≥18 with rectal resection. ICD-9-CM diagnosis and procedural codes were utilized to identify surgical approaches, conversions to OS, and surgical complications. Propensity score matching on patient, surgeon, and hospital level characteristics was used to create comparable groups of RA\LS patients (n = 533 per group). Predictors of conversion from LS and RA to OS were identified with stepwise logistic regression in the unmatched sample.

RESULTS

Post-match results suggested comparable perioperative complication rates (RA 29% vs LS 29%; p = .7784); whereas conversion rates to OS were 12% for RA vs 29% for LS (p < .0001). Colorectal surgeons (RA 9% vs LS 23%), general surgeons (RA 13% vs LS 35%), and smaller bed-size hospitals (RA 14% vs LS 33%) have reduced conversion rates for RA vs LS (p < .0001). Statistically significant predictors of conversion included LS, non-colorectal surgeon, and smaller bed-size hospitals.

LIMITATIONS

Retrospective observational study limitations apply. Analysis of the hospital administrative database was subject to the data captured in the database and the accuracy of coding. Propensity score matching limitations apply. RA and LS groups were balanced with respect to measured patient, surgeon, and hospital characteristics.

CONCLUSIONS

Compared to LS, RA offers a higher probability of completing a successful minimally invasive surgery for rectal cancer patients undergoing rectal resection without exacerbating complications. Male, obese, or moderately-to-severely ill patients had higher conversion rates. While colorectal surgeons had lower conversion rates from RA than LS, the reduction was magnified for general surgeons and smaller bed-size hospitals.

Conversion is a risk factor for postoperative anastomotic leak in rectal cancer patients - A retrospective cohort study

AIM

The impact of conversion from laparoscopic surgery to laparotomy on the development of anastomotic leak (AL) in rectal cancer patients following laparoscopic low anterior resection (LAR) with total mesorectal excision (TME) has not been evaluated. The aim of this study was to evaluate the impact of conversion on the risk of AL and develop a prediction nomogram for postoperative AL.

METHODS

All rectal cancer patients following laparoscopic LAR with TME from January 2010 to October 2014 were enrolled in the primary cohort. Comparisons of the postoperative anastomotic leak incidence rate between converted patients and non-converted patients were performed using both univariate and multivariate logistic regression analyses. The result of multivariable analysis was used to develop the predicting model and the performance of nomogram was assessed with respect to its calibration, discrimination, and clinical usefulness. An independent validation cohort containing 200 patients from November 2014 to October 2015 was assessed.

RESULTS

Of all patients enrolled (n=646), 592 (91.6%) patients underwent totally laparoscopic surgery, and 54 (8.4%) were converted from laparoscopic surgery to laparotomy. Converted group patients were more likely to have a higher body mass index (BMI), prolonged length of stay (LOS), increased overall postoperative complication rates and advanced clinical T stage (T3 or T4), pathological N stage (N1 or N2) and pathological TNM stage (III or IV). The percentage of patients who had preoperative radiotherapy for rectal cancer was higher in non-converted patients. Patients who underwent conversion to laparotomy (n=10, 18.5%) were more likely to suffer from postoperative AL than those undergoing totally laparoscopic surgery (n=38, 6.4%) (P=0.004). Multivariate logistic regression analyses confirmed the association between conversion and postoperative AL (Odds ratio [OR], 95% confidence interval [CI]: 2.71 [1.31-5.63], P=0.007). Conversion, gender, and clinical N stage incorporated in the individualized prediction nomogram showed good discrimination, with a C-index of 0.697 (C-index, 0.621 and 0.772 through internal validation), and good calibration. In the validation cohort, the main results were consistent with the findings of the primary cohort, with a C-index of 0.670 (C-index, 0.562 and 0.777 through internal validation). Decision curve analysis demonstrated that the prediction nomogram was clinically useful.

CONCLUSION

Conversion during laparoscopic LAR was found to be associated with an increased risk for the postoperative AL in RC patients. A nomogram model incorporating conversion, gender and patient's clinical N stage seems to offers a useful tool for predicting postoperative AL in these patients.

Toward standardization of laparoscopic resection for colorectal cancer in developing countries: A step by step module

BACKGROUND

Despite the proven benefits, laparoscopic colorectal surgery is still underutilized among surgeons especially in developing countries. Also a steep learning is one of the causes of its limited adoption.

OBJECTIVE

To explore the learning curve of single surgeon experience in laparoscopic colectomy and feasibility of implementing a well standardized step by step operative technique to overcome the beginning technical obstacles.

PATIENTS AND METHODS

This prospective study included 50 patients with carcinoma of the left colon and rectum recruited from the department of surgical oncology at National Cancer Institute, Cairo University in the period 2012-2016. All the procedures were performed through laparoscopic approach. Intra and post-operative data were recorded and analyzed.

RESULTS

The mean age was 49.7±10.6years (range: 33-74years). They were 29 males and 21 females. The mean operation time was 180min (range 100-370min), and the mean blood loss was 350ml (60-600ml). Six patients (12%) were converted to a laparotomy. The median lymph nodes harvest was 12 (range 7-25). The mean time of passing flatus after surgery was 2days (1-4days) and the mean time of passing stools was 3.3days (2-5) days. The median hospitalization period after surgery was 4days (3-12). 5 patients (10%) had postoperative morbidity, major morbidity occurred in one patient.

CONCLUSION

Laparoscopic colorectal surgery for colorectal cancer is safe and oncologically sound, standardized well-structured laparoscopic technique masters the procedure even in early learning curve setting.

Safety and feasibility of laparoscopic multivisceral resection for surgical T4b colon cancers: Retrospective analyses

INTRODUCTION

Laparoscopic (Lap) surgery has not been established as a standard procedure for locally advanced colon cancers. Here, we evaluated the safety and feasibility of Lap multivisceral resection (MVR) for tumors that had invaded adjacent organs (T4b).

METHODS

We performed retrospective analyses using a single institutional database. Eighty-four patients who underwent Lap or open MVR for surgical T4b primary colon cancers satisfied the inclusion criteria.

RESULTS

Among the 84 patients, 48 underwent Lap MVR and 36 underwent open MVR. More patients in the open group were clinical T4b and were receiving neoadjuvant chemotherapy. Patients in the open group had worse performance status (P = 0.037) and tumors of greater diameter. Lap completion was achieved in 42 cases (87.5%); the conversion rate was highest in cases involving the urinary tract (40.0%). Lap reconstruction of the bladder or ureter was extremely challenging, and therefore, adjacent organ reconstruction influenced Lap completion. Regarding perioperative outcomes, Lap was superior to open surgery in terms of intraoperative blood loss, morbidity, and postoperative hospital stay. Conversion was required in six cases; five were strategic conversions, and conversion was not associated with severe morbidity. The microscopic positive surgical margin rate was not higher in the Lap group than in the open group. Kaplan-Meier analyses of overall and disease-free survival were comparable between the groups. Cox regression analyses revealed that the operative approach did not have a significant adverse effect on long-term outcomes.

CONCLUSION

The Lap approach could be considered for surgical T4b cancers, except for urinary tract invasion cases that require complicated reconstruction.

The Impact of Laparoscopic-assisted Colorectal Surgery Using 3-dimensional Reconstruction for Highly Obese Patients With Colorectal Cancer

OBJECTIVES

During laparoscopic-assisted colorectal surgery (LACS), precise recognition of the anatomic variations and relationships among tumor and vessels is required. However, in highly obese patients, it is more difficult to grasp the surgical anatomy due to the presence of dense mesenteric fat tissue. We utilized a 3-dimensional (3D) reconstructed image for preoperative simulation and intraoperative navigation for LACS. In this study, we examined the correlation between patient obesity and 3D-simulated perioperative outcomes.

MATERIALS AND METHODS

We retrospectively analyzed 124 patients who underwent LACS using 3D surgical simulation at Tsukuba Medical Center Hospital. We sequentially divided our cohort into 2 groups: patients with a low body mass index (BMI<25 kg/m, n=60) and patients with a high BMI (BMI ≥25 kg/m, n=64). Patient characteristics and perioperative outcomes, including conversion rate, postoperative complications, operating time, intraoperative blood loss, and length of postoperative hospital stay, were compared for these 2 groups.

RESULTS

There were no significant differences in patient background between the 2 groups.We found it more difficult to grasp the surgical anatomy, including vessel arrangement, for high-BMI patients than for low-BMI patients because of the dense mesenteric fat tissue in high-BMI patients. There were no significant differences between the 2 groups with respect to perioperative outcomes.

CONCLUSIONS

The utilized reconstructed 3D images were useful for understanding anatomic relationships, including vessel arrangement, during LACS, particularly in highly obese patients.

Cancer recurrence following conversion during laparoscopic colorectal resections: a meta-analysis

INTRODUCTION

Evidence regarding long-term oncological outcomes following conversion to open surgery (COS) during laparoscopic colorectal resection (LCR) is controversial. The aim of this study is to assess the impact on cancer recurrence of a failed laparoscopic attempt.

METHODS

MEDLINE, Scopus and ISI Web of Knowledge databases were searched for articles reporting data on cancer recurrence in patients undergoing completed LCR and COS. Data were pooled by fixed or random effect modeling, according to the presence of heterogeneity. Primary outcomes were local recurrence (LR) and distance recurrence (DR).

RESULTS

Seven studies involving 2493 patients (completed LCR, n 2201 and COS, n 292) were included. The pooled analysis showed that COS resections have an higher risk of LR (OR 1.97, 95% CI 1.14-3.42, p = 0.1); no difference was found in DR (OR 1.09, 95% CI 0.67-1.77, p = 0.71). However, an higher rate of T4 tumor was present in the converted group (OR 2.62, 95% CI 1.71-4, p = 0.0). Subgroup analysis including studies with T stage matched populations showed no significant statistical difference in LR rate; however, a trend toward higher recurrence was still clear.

CONCLUSION

There is no consistent evidence that a failed laparoscopic attempt does not result in a poorer oncological outcome; therefore, a careful selection of patients for LCR for cancer is required.

Impact of Timing of Conversion to Open Surgery on Short-Term and Oncologic Outcomes in Patients Undergoing Minimally Invasive Surgery for Colorectal Cancer

To evaluate the influence of timing of open conversion on short-term and oncologic outcomes after minimally invasive surgery for colorectal cancer. Six hundred forty-six consecutive patients were enrolled. All patients converted to open surgery were classified into early (n = 10) or late (n = 67) groups based on conversion timing using a 60-minute cutoff. A comparison of early conversion and nonconverted groups showed that history of prior abdominal surgery and pT4 tumor was more common in the early conversion group. Mean operative time was longer in the early conversion group. Rates of 30-day postoperative complications (30% vs 27%), time to soft diet (5 days vs 5 days), and hospital stay (12 days vs 12 days) were not different. A comparison of the late and nonconverted groups showed that history of prior abdominal surgery was more common in the late conversion group. Mean operative time was longer in the late conversion. Rates of 30-day postoperative complications (42% vs 27%), Clavien–Dindo score ≥3 (22% vs 11%), intensive care unit care (31% vs 15%), and transfusion (37% vs 21%) were significantly higher in the late conversion group. Time to soft diet (6 days vs 5 days) and hospital stay (15 days vs 12 days, P = 0.037) were longer in the late conversion group. Cancer-specific and recurrence-free survival rates did not differ among the early, late conversion, and nonconverted groups. Decisions about open conversion need be made within 60 minutes of the beginning of surgery as early conversion does not worsen short-term and oncologic outcomes.

Impact of surgeon laparoscopic training and case volume of laparoscopic surgery on conversion during elective laparoscopic colorectal surgery

AIM

The study aimed to determine whether laparoscopic volume and type of training influence conversion during elective laparoscopic colorectal surgery.

METHOD

An Institutional Review Board-approved prospective database was reviewed for patients who underwent colorectal resection, performed by six colorectal surgeons, for all diagnoses from 2009 to 2014. Surgeons were designated as laparoscopic- or open-trained based on formal laparoscopic colorectal surgery training, and were classified as low laparoscopic volume (LLV) (i.e. had performed < 100 laparoscopic procedures) or high laparoscopic volume (HLV) (i.e. had performed ≥ 100 laparoscopic procedures). Technique was laparoscopic, open or converted (pre-emptive or reactive). Conversion was compared among three groups: LLV, laparoscopic trained (group A); LLV, open trained (group B); and HLV, open trained (group C).

RESULTS

In total, 159/567 procedures were open and 408 laparoscopic procedures were attempted. Of the 408 laparoscopic procedures, 73 were converted. Among the 567 patients [mean age: 56 ± 17 years (44% male)], the overall conversion rate was 13% (73/567), including 75% pre-emptive and 25% reactive. Conversion rates for groups A, B and C were 17.9%, 42.6% and 14.3%, respectively. Significantly higher conversion was seen in group B compared with group C (P = 0.01), but not between group A and group C (P = 0.85) or between group B and group A (P = 0.11). Converted patients were older (P < 0.001), with lower rates of proctectomy (P = 0.007), higher rates of anastomosis (P < 0.001) and higher body mass index (BMI) (P < 0.001). After adjusting for patient and surgeon factors, training type was not associated with conversion (P = 0.15). Compared with successful laparoscopy, converted patients had a significantly higher incidence of ileus (P < 0.001), length of stay (P = 0.002), time to flatus (OR = 3.21, P < 0.001) and time to solids (P < 0.001). Converted patients experienced increased morbidity.

CONCLUSION

Training is not associated with conversion. Rather, HLV surgeons, regardless of training, convert less frequently than do LLV surgeons.

Intraoperative modifiable risk factors of colorectal anastomotic leakage: Why surgeons and anesthesiologists should act together

BACKGROUND

Colorectal anastomotic leakage (CAL) is a major surgical complication in intestinal surgery. Despite many optimizations in patient care, the incidence of CAL is stable (3-19%) [1]. Previous research mainly focused on determining patient and surgery related risk factors. Intraoperative non-surgery related risk factors for anastomotic healing also contribute to surgical outcome. This review offers an overview of potential modifiable risk factors that may play a role during the operation.

METHODS

Two independent literature searches were performed using EMBASE, Pubmed and Cochrane databases. Both clinical and experimental studies published in English from 1985 to August 2015 were included. The main outcome measure was the risk of anastomotic leakage and other postoperative complications during colorectal surgery. Determined risk factors of CAL were stated as strong evidence (level I and II high quality studies), and potential risk factors as either moderate evidence (experimental studies level III), or weak evidence (level IV or V studies).

RESULTS

The final analysis included 117 articles. Independent factors of CAL are diabetes mellitus, hyperglycemia and a high HbA1c, anemia, blood loss, blood transfusions, prolonged operating time, intraoperative events and contamination and a lack of antibiotics. Unequivocal are data on blood pressure, the use of inotropes/vasopressors, oxygen suppletion, type of analgesia and goal directed fluid therapy. No studies could be found identifying the impact of body core temperature or mean arterial pressure on CAL. Subjective factors such as the surgeons' own assessment of local perfusion and visibility of the operating field have not been the subject of relevant studies for occurrence in patients with CAL.

CONCLUSION

Both surgery related and non-surgery related risk factors that can be modified must be identified to improve colorectal care. Surgeons and anesthesiologists should cooperate on these items in their continuous effort to reduce the number of CAL. A registration study determining individual intraoperative risk factors of CAL is currently performed as a multicenter cohort study in the Netherlands.

The influence of obesity and body mass index on the outcome of laparoscopic colorectal surgery: a systematic literature review

AIM

The relationship between obesity, body mass index (BMI) and laparoscopic colorectal resection is unclear. Our object was to assess systematically the available evidence to establish the influence of obesity and BMI on the outcome of laparoscopic colorectal resection.

METHOD

A search of PubMed/Medline databases was performed in May 2015 to identify all studies investigating the impact of BMI and obesity on elective laparoscopic colorectal resection performed for benign or malignant bowel disease. Clinical end-points examined included operation time, conversion rate to open surgery, postoperative complications including anastomotic leakage, length of hospital stay, readmission rate, reoperation rate and mortality. For patients who underwent an operation for cancer, the harvested number of lymph nodes and long-term oncological data were also examined.

RESULTS

Forty-five studies were analysed, the majority of which were level IV with only four level III (Oxford Centre for Evidence-based Medicine 2011) case-controlled studies. Thirty comparative studies containing 23 649 patients including 17 895 non-obese and 5754 obese showed no significant differences between the two groups with respect to intra-operative blood loss, overall postoperative morbidity, anastomotic leakage, reoperation rate, mortality and the number of retrieved lymph nodes in patients operated on for malignancy. Most studies, including 15 non-comparative studies, reported a longer operation time in patients who underwent a laparoscopic procedure with the BMI being an independent predictor in multivariate analyses for the operation time.

CONCLUSION

Laparoscopic colorectal resection is safe and technically and oncologically feasible in obese patients. These results, however, may vary outside of high volume centres of expertise.

Adverse Events in Robotic Surgery: A Retrospective Study of 14 Years of FDA Data

BACKGROUND

Use of robotic systems for minimally invasive surgery has rapidly increased during the last decade. Understanding the causes of adverse events and their impact on patients in robot-assisted surgery will help improve systems and operational practices to avoid incidents in the future.

METHODS

By developing an automated natural language processing tool, we performed a comprehensive analysis of the adverse events reported to the publicly available MAUDE database (maintained by the U.S. Food and Drug Administration) from 2000 to 2013. We determined the number of events reported per procedure and per surgical specialty, the most common types of device malfunctions and their impact on patients, and the potential causes for catastrophic events such as patient injuries and deaths.

RESULTS

During the study period, 144 deaths (1.4% of the 10,624 reports), 1,391 patient injuries (13.1%), and 8,061 device malfunctions (75.9%) were reported. The numbers of injury and death events per procedure have stayed relatively constant (mean = 83.4, 95% confidence interval (CI), 74.2-92.7 per 100,000 procedures) over the years. Surgical specialties for which robots are extensively used, such as gynecology and urology, had lower numbers of injuries, deaths, and conversions per procedure than more complex surgeries, such as cardiothoracic and head and neck (106.3 vs. 232.9 per 100,000 procedures, Risk Ratio = 2.2, 95% CI, 1.9-2.6). Device and instrument malfunctions, such as falling of burnt/broken pieces of instruments into the patient (14.7%), electrical arcing of instruments (10.5%), unintended operation of instruments (8.6%), system errors (5%), and video/imaging problems (2.6%), constituted a major part of the reports. Device malfunctions impacted patients in terms of injuries or procedure interruptions. In 1,104 (10.4%) of all the events, the procedure was interrupted to restart the system (3.1%), to convert the procedure to non-robotic techniques (7.3%), or to reschedule it (2.5%).

CONCLUSIONS

Despite widespread adoption of robotic systems for minimally invasive surgery in the U.S., a non-negligible number of technical difficulties and complications are still being experienced during procedures. Adoption of advanced techniques in design and operation of robotic surgical systems and enhanced mechanisms for adverse event reporting may reduce these preventable incidents in the future.

Outcomes of conversion of laparoscopic colorectal surgery to open surgery

Objectives:

There is limited data regarding the outcomes of patients who undergo conversion to open surgery during a laparoscopic operation in colorectal resection. We sought to identify the outcomes of such patients.

Methods:

The NIS (National Inpatient Sample) database was used to identify patients who had conversion from laparoscopic to open colorectal surgery during the 2009 to 2012 period. Multivariate regression analysis was performed to identify risk-adjusted outcomes of conversion to open surgery.

Results:

We sampled 776 007 patients who underwent colorectal resection. 337 732 (43.5%) of the patients had laparoscopic resection. Of these, 48 265 procedures (14.3%) were converted to open surgery. The mortality of converted patients was increased, when compared with successfully completed laparoscopic operations, but was still lower than that of open procedures (0.6% vs. 1.4% vs. 3.9%, respectively; adjusted odds ratio [AOR], 1.61 and 0.58, respectively; P < .01). The most common laparoscopic colorectal procedure was right colectomy (41.2%). The lowest rate of conversion is seen with right colectomy while proctectomy had the highest rate of conversion (31.2% vs. 12.9%, AOR, 2.81, P < .01). Postsurgical complications including intra-abdominal abscess (AOR, 2.64), prolonged ileus (AOR, 1.50), and wound infection (AOR, 2.38) were higher in procedures requiring conversion (P < .01).

Conclusions:

Conversion of laparoscopic to open colorectal resection occurs in 14.3% of cases. Compared with patients who had laparoscopic operations, patients who had conversion to open surgery had a higher mortality, higher overall morbidity, longer length of hospitalization, and increased hospital charges. The lowest conversion rate was in right colectomy and the highest was in proctectomy procedures. Wound infection in converted procedures is higher than in laparoscopic and open procedures.

Laparoscopic Surgery for Transverse Colon Cancer: Short- and Long-Term Outcomes in Comparison with Conventional Open Surgery

BACKGROUND

Published studies on laparoscopic surgery for transverse colon cancer are scarce. More studies are necessary to evaluate the feasibility, safety, and long-term oncologic outcomes of laparoscopic surgery for transverse colon cancer.

SUBJECTS AND METHODS

From April 1996 to December 2010, 102 consecutive patients with stage II or III disease who had undergone curative resection for transverse colon cancer were enrolled. Seventy-nine patients underwent laparoscopy-assisted colectomy (LAC), whereas 23 patients underwent conventional open colectomy (OC). Short- and long-term outcomes of the two groups were compared.

RESULTS

The OC group had a larger tumor size (7.6 ± 3.4 cm versus 5.2 ± 2.3 cm, P = .004) and more retrieved lymph nodes (26.4 ± 11.6 versus 17.5 ± 9.4, P = .002), without differences in resection margins. In the LAC group, return to diet was faster (4.5 ± 1.2 days versus 5.4 ± 1.8 days, P = .013), and postoperative hospital stay was shorter (12.1 ± 4.2 days versus 15.9 ± 4.8 days, P = .000). There were no differences in occurrence of intra- or postoperative complications. There were no statistically significant differences in overall survival rate (OS) or disease-free survival rate (DFS) between the two groups (5-year OS, 90.4% versus 90.5%, P = .670; 5-year DFS, 84.2% versus 90.7%, P = .463).

CONCLUSIONS

Laparoscopic surgery for transverse colon cancer has better short-term outcomes compared with open surgery, with acceptable long-term outcomes. As in colorectal cancer of other sites, laparoscopic surgery can be a feasible alternative to conventional surgery for transverse colon cancer.

Conversion during laparoscopic colorectal resections: a complication or a drawback? A systematic review and meta-analysis of short-term outcomes

PURPOSE

Several studies compared the outcomes of laparoscopically completed colorectal resections (LCR) to those requiring conversion to open surgery (COS). However, a comparative analysis between COS patients and patients undergoing planned open surgery (POS) would be useful to clarify if the conversion can be considered a simple drawback or a complication, being cause of additional postoperative morbidity. The aim of this study is to perform a meta-analysis of current evidences comparing postoperative outcomes of COS patients to POS patients.

METHODS

A systematic search of Medline, ISI Web of Knowledge, and Scopus was performed to identify studies reporting short-term outcomes of COS and POS patients. Primary outcomes were 30-day overall morbidity and length of postoperative hospital stay. Data were analyzed with fixed-effect modeling, and sensitivity analyses were performed to test the robustness of the results.

RESULTS

Twenty studies involving 30,656 patients undergoing POS and 1935 COS patients were selected. The mean conversion rate was 0.17. Similar 30-day overall morbidity and length of postoperative hospital stay were found in COS and POS patients. Wound infection (OR 1.43, 95 % CI 1.12 to 1.83, p < 0.01) was higher in the COS group. Other results were robust. Outcomes were comparable for patients undergoing resection for different natures of the disease (benign vs. malignant) and at different sites (colon vs. rectum).

CONCLUSION

Conversions from laparoscopic to open procedure during colorectal resection are not associated with a poorer postoperative outcome compared to patients undergoing planned open surgery, except for a higher risk of wound infection.

A case-control study examining the benefits of laparoscopic colectomy using a totally intracorporeal technique for left-sided colon tumors

Laparoscopic-assisted colectomy with an extracorporeal anastomosis is associated with a higher conversion rate for left-sided colon tumors. We hypothesized that a totally intracorporeal laparoscopic colectomy (TILC) would minimize operative conversion and morbidity. We conducted a case-control study comparing TILC for left-sided and right-sided tumors with matching based on age and ASA status. TILC was performed for 105 colon tumors with an overall conversion rate of 6.5%, a complication rate of 22%, and median length of stay of 5 days. There were 35 patients undergoing TILC for left-sided colon tumors and 70 patients undergoing TILC for right-sided colon tumors. Operative conversion for left-sided TILC (6%) was similar (P=0.78) to right-sided TILC (7%). Complication rates for left-sided TILC (23%) were no different (P=0.87) compared with right-sided TILC (21%). Length of stay for left-sided TILC (5 d) was comparable (P=0.17) to right-sided TILC (5 d). Laparoscopic left colectomy can be successfully performed with equivalent results to laparoscopic right colectomy by using a totally intracorporeal technique.

Risk factors for conversion of laparoscopic colorectal surgery to open surgery: does conversion worsen outcome?

INTRODUCTION

The utilization of laparoscopy in colorectal surgery is increasing. However, conversion to open surgery remains relatively high.

OBJECTIVE

We evaluated (1) conversion rates in laparoscopic colorectal surgery; (2) the outcomes of converted cases compared with successful laparoscopic and open colorectal operations; (3) predictive risk factors of conversion of laparoscopic colorectal surgery to open surgery.

METHODS

Using the National Inpatient Sample database, we examined the clinical data of patients who underwent colon and rectal resection from 2009 to 2010. Multivariate regression analysis was performed to identify factors predictive for conversion of laparoscopic to open operation.

RESULTS

A total of 207,311 patients underwent intended laparoscopic colorectal resection during this period. The conversion rate was 16.6 %. Considering resection type and pathology, the highest conversion rates were observed in proctectomy (31.4 %) and Crohn's disease (20.2 %). Using multivariate regression analysis, Crohn's disease (adjusted odds ratio [AOR], 2.80), prior abdominal surgery (AOR, 2.45), proctectomy (AOR, 2.42), malignant pathology (AOR, 1.90), emergent surgery (AOR, 1.82), obesity (AOR, 1.63), and ulcerative colitis (AOR, 1.60) significantly impacted the risk of conversion. Compared with patients who were successfully completed laparoscopically, converted patients had a significantly higher complication rate (laparoscopic: 23 %; vs. converted: 35.2 % vs. open: 35.3 %), a higher in-hospital mortality rate (laparoscopic: 0.5 %; vs. converted: 0.6 %; vs. open: 1.7 %) and a longer mean hospital stay (laparoscopic: 5.4 days; vs. converted: 8.1 days; vs. open: 8.4 days); however, converted patients had better outcomes compared with the open group.

CONCLUSIONS

The conversion rate in colorectal surgery was 16.6 %. Converted patients had significantly higher rates of morbidity and mortality compared to successfully completed laparoscopic cases, although lower than open cases. Crohn's disease, prior abdominal surgery, and proctectomy are the strongest predictors for conversion of laparoscopic to open in colorectal operations.

Preoperative risk factors and radiographic findings predictive of laparoscopic conversion to open procedures in Crohn's disease

INTRODUCTION

Laparoscopy is accepted as a standard surgical approach for Crohn's disease. However, the rate of conversion is high, ranging from 15 to 70 % depending on the population. There are also concerns that conversion results in worsened outcomes versus an initial open procedure.

METHODS

This study evaluated preoperative radiographic findings to determine who is at increased risk of conversion and may therefore benefit from an initial open approach. A case-matched study included patients from 2004 to 2013 with preoperative CTE/MRE who underwent laparoscopic surgery converted to an open approach, and compared them to laparoscopically completed controls with similar age, same surgeon, and number of previous abdominal operations. Studies were reviewed by two blinded radiologists. Variables included abdominal AP diameter, amount of subcutaneous fat, peritoneal versus pelvic location of disease (greater or lesser hemipelvis or abdomen), intestinal location of disease (colon, TI, ileum, jejunum), and presence, length, and location of strictures, simple or complex fistula, phlegmon, or abscess. Conditional logistic regression evaluated relationships between radiographic variables and conversion. Twenty-seven patients meeting study criteria were compared with 81 controls.

RESULTS

A negative association between conversion and disease in the left lesser pelvis was found (p = 0.019) and neared significance for left abdomen (p = 0.08). Positive correlations were found with pelvic fistulas (p = 0.003), complex fistulas (p = 0.017), and pelvic abscesses (p = 0.009) and neared significance for Society of Abdominal Radiology classification (p = 0.058).

CONCLUSION

Preoperative imaging in patients with Crohn's disease can help in selecting the most suitable cases to approach laparoscopically and reduce conversion rates and should be evaluated in conjunction with other preoperative factors.

Safety of supervised trainee-performed laparoscopic surgery for inflammatory bowel disease

PURPOSE

There is a significant risk of surgical resection during the lifetime of an inflammatory bowel disease (IBD) patient: laparoscopic surgery has been increasingly applied to the management of IBD with short and long-term advantages. The aim of this study is to demonstrate that laparoscopic surgery for IBD, performed by a surgical trainee under the supervision of an experienced trainer, is feasible and safe.

METHODS

All surgical procedures were sub-divided in six critical steps in order to define the procedure as supervised trainee performed (STP) when the trainer was present unscrubbed in the theatre or assisting and trainer performed (TNER) when the trainer performed two or more critical steps of the procedure. Included were all patients undergoing laparoscopic resection for IBD between January 2009 and December 2013. Thirty-day mortality and morbidity were the primary outcomes. Reoperations and rehospitalizations within 30 days of discharge were recorded prospectively and were the secondary outcomes together with conversion rate and length of hospital stay.

RESULTS

One hundred fifty-one patients were included: 77 (50.99%) STP and 74 (49.01%) TNER. No deaths occurred, and 30-day morbidity was 27.15% with no differences between the groups. Operating time was longer in the STP (166.6 ± 53.31 vs 130.4 ± 49.15). Five patients (2 vs 3) required reoperation (3.31%), while 13 patients (8.6%) required readmission.

CONCLUSIONS

Laparoscopic surgery for IBD performed by a supervised trainee is safe compared to trainers performed procedures despite a longer operating time. Randomized clinical trials are needed to confirm these preliminary results and to investigate long-term outcomes.

Factors associated with conversion from laparoscopic to open colectomy using the National Surgical Quality Improvement Program (NSQIP) database

AIM

Conversion rates from laparoscopic to open colectomy and associated factors are traditionally reported in clinical trials or reviews of outcomes from experienced institutions. Indications and selection criteria for laparoscopic colectomy may be more narrowly defined in these circumstances. With the increased adoption of laparoscopy, conversion rates using national data need to be closely examined. The purpose of this study was to use data from the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) to identify factors associated with conversion of laparoscopic to open colectomy at a national scale in the United States.

METHOD

The ACS-NSQIP Participant Use Data Files for 2006-2011 were used to identify patients who had undergone laparoscopic colectomy. Converted cases were identified using open colectomy as the primary procedure and laparoscopic colectomy as 'other procedure'. Preoperative variables were identified and statistics were calculated using sas version 9.3. Logistic regression was used to model the multivariate relationship between patient variables and conversion status.

RESULTS

Laparoscopy was successfully performed in 41 585 patients, of whom 2508 (5.8%) required conversion to an open procedure. On univariate analysis the following factors were significant: age, body mass index (BMI), American Society of Anesthesiologists (ASA) class, presence of diabetes, smoking, chronic obstructive pulmonary disease, ascites, stroke, weight loss and chemotherapy (P < 0.05). The following factors remained significant on multivariate analysis: age, BMI, ASA class, smoking, ascites and weight loss.

CONCLUSION

Multiple significant factors for conversion from laparoscopic to open colectomy were identified. A novel finding was the increased risk of conversion for underweight patients. As laparoscopic colectomy is become increasingly utilized, factors predictive of conversion to open procedures should be sought via large national cohorts.

Laparoscopic management of diverticular colovesical fistula: experience in 15 cases and review of the literature

Colovesical fistulas secondary to diverticular disease may be considered a contraindication to the laparoscopic approach. The feasibility of laparoscopic management of complicated diverticulitis and mixed diverticular fistulas has been demonstrated. However, few studies on the laparoscopic management of diverticular colovesical fistulas exist. A retrospective analysis was performed of 15 patients with diverticular colovesical fistula, who underwent laparoscopic-assisted anterior resection and bladder repair. Median operating time was 135 minutes and median blood loss, 75 mL. Five patients were converted to an open procedure (33.3%) with an associated increase in hospital stay (P = 0.035). Median time to return of bowel function was 2 days and median length of stay, 6 days. Overall morbidity was 20% with no major complications. There was no mortality. There was no recurrence during median follow-up of 12.4 months. These results suggest that laparoscopic management of diverticular colovesical fistulas is both feasible and safe in the setting of appropriate surgical expertise.

Improved survival for older patients undergoing surgery for colorectal cancer between 2008 and 2011

INTRODUCTION

Older colorectal cancer patients have a higher risk of postoperative complications, and the impact of adverse events on survival is also significantly higher. Innovations like laparoscopic surgery which improve short-term outcome for older patients can also benefit their overall prognosis. We set out to analyse the impact of an increased utilisation of laparoscopic surgery for colorectal cancer in the Netherlands on overall survival.

METHODS

All patients diagnosed with stages I-III colorectal cancer in the Netherlands between 2008 and 2011 were selected from the Netherlands Cancer Registry. Changes in perioperative mortality, 3-month mortality and 1-year mortality rates were analysed using year of diagnosis as an instrumental variable.

RESULTS

Over 33,000 patients were included in the analyses. Data on surgical approach were not precisely known for 2008 and 2009; in 2010, 36.6 % of definitive surgical procedures were performed laparoscopically and 45.9 % in 2011. A laparoscopic approach was used less frequently in the patients aged ≥75 years (in 2011, 40.3 versus 49.2 % of younger patients; p < 0.001). Between 2008 and 2011, perioperative mortality decreased from 2.0 to 1.5 % (p = 0.02), 3-month mortality from 4.8 to 3.9 % (p = 0.01) and 1-year mortality from 9.6 to 8.3 % (p < 0.001). The absolute risk reduction was greatest for patients aged ≥75 years, reaching 2.1 % for 1-year mortality.

CONCLUSION

Between 2008 and 2011, the utilisation of a laparoscopic approach increases significantly, resulting in reduced mortality rates, particularly for the elderly. Therefore, a laparoscopic approach should be used whenever possible, which may allow for further improvement of outcomes.

The influence of laparoscopy on incisional hernia rates: a retrospective analysis of 1057 colorectal cancer resections

AIM

The aim of this study was to evaluate the incidence of incisional hernia formation after laparoscopic and open surgery for colorectal cancer.

METHOD

A retrospective analysis was conducted of 1057 colorectal cancer resection cases (289 laparoscopic, 768 open) performed in a single national laparoscopic training centre between January 2006 and December 2011. Clinical notes and serial computed tomography scans were reviewed, with any incisional hernia including those at a surgical incision, port site, stoma and stoma closure site identified and the size of the defect measured.

RESULTS

The overall incisional hernia rate was 14.8%. There was no significant difference between the open and laparoscopic groups (14.4% vs 15.9%, P = 0.566). Excluding stoma-related hernia, 10.7% of the open group developed a surgical wound hernia, and 11.1% of the laparoscopic group developed a hernia at a port site, extraction site or surgical midline incision. There was no statistical difference between the two groups (P = 0.853). The defects were smaller in the laparoscopic group (P < 0.005). There were significantly more parastomal hernias in the laparoscopic group (40%) than in the open group (12.7%, P < 0.001).

CONCLUSION

The incidence of incisional hernia formation was similar after laparoscopic or open surgery for colorectal cancer. Parastomal hernia was more frequent after laparoscopic surgery.

Laparoscopic colorectal resections: a simple predictor model and a stratification risk for conversion to open surgery

BACKGROUND

The advantages associated with the laparoscopic approach are lost when conversion is required. Available predictive models have failed to show external validation. Body surface area is a recently described risk factor not included in these models.

OBJECTIVE

The aim of this study was to develop a clinical rule including body surface area for predicting conversion in patients undergoing elective laparoscopic colorectal surgery.

DESIGN

This was a prospective cohort study.

SETTING

This study was conducted at a single large tertiary care institution.

PATIENTS

Nine hundred sixteen patients (mean age, 63.9; range, 14-91 years; 53.2% female) who underwent surgery between January 2004 and August 2011 were identified from a prospective database.

MAIN OUTCOME MEASURES

Conversion rate was analyzed related to age, sex, obesity, disease location (colon vs rectum), type of disease (neoplastic vs nonneoplastic), history of previous surgery, and body surface area. A predictive model for conversion was developed with the use of logistic regression to identify independently associated variables, and a simple clinical prediction rule was derived. Internal validation of the model was performed by using bootstrapping.

RESULTS

The conversion rate was 9.9% (91/916). Rectal disease, large patient size, and male sex were independently associated with higher odds of conversion (OR, 2.28 95%CI, 1.47-3.46]), 1.88 [1.1-3.44], and 1.87 [1.04-3.24]). The prediction rule identified 3 risk groups: low risk (women and nonlarge males), average risk (large males with colon disease), and high risk (large males with rectal disease). Conversion rates among these groups were 5.7%, 11.3%, and 27.8% (p < 0.001). Compared with the low-risk group, ORs for average- and high-risk groups were 2.17 (1.30-3.62, p = 0.004) and 6.38 (3.57-11.4, p < 0.0001).

LIMITATIONS

The study was limited by the lack of external validation.

CONCLUSION

This predictive model, including body surface area, stratifies patients with different conversion risks and may help to inform patients, to select cases in the early learning curve, and to evaluate the standard of care. However, this prediction rule needs to be externally validated in other samples (see Video, Supplemental Digital Content 1, http://links.lww.com/DCR/A137).

Is laparoscopic colorectal cancer surgery associated with an increased risk in obese patients? A retrospective study from China

Background

The impact of obesity on surgical outcomes after laparoscopic colorectal cancer resection in Chinese patients is still unclear.

Methods

We retrospectively reviewed the prospectively collected data from 527 consecutive colorectal cancer patients who under went laparoscopic resection from January 2008 to September 2013. Patients were categorized into three groups: nonobese (body mass index (BMI) <25.0 kg/m²), obese I (BMI 25.0 = to 29.9 kg/m²) and obese II (BMI ≥30.0 kg/m²). Clinical characteristics, surgical outcomes and postoperative complications were compared between nonobese, obese I and obese II patients.

Results

From among the 527 patients, there were 371 patients with in the nonobese group, 142 patients in the obese I group and 14 patients in the obese II group. The patients were well-matched for age, sex and American Society of Anesthesiologists class, except for BMI (P = 0.001). The median operative time correlated highly significantly with increasing weight (median: nonobese = 135 minutes, obese I = 145 minutes, obese II = 162.5 minutes; P = 0.001). There appeared to be a slight tendency toward grade III complications (rated according to the Clavien-Dindo Classification of Surgical Complications) in the obese II group, but this difference was not significant (nonobese = 5.1%, obese I = 3.5% and obese II = 14.3%; P = 0.178). None of the grade III complications which occurred in the obese II group were wound dehiscences that required a stitch. Other aspects, such as estimated blood loss, harvested lymph nodes, operation type, pathological results, conversion rate and overall postoperative complications, were not statistically significant.

Conclusion

With sufficient experience, laparoscopic colorectal cancer surgery is feasible and safe in obese Chinese patients.

Systematic review and meta-analysis of laparoscopic versus open distal gastrectomy

BACKGROUND

Laparoscopic distal gastrectomy has been increasingly utilized in the treatment of gastric adenocarcinoma. This study aims to compare the morbidity/mortality and postoperative outcomes of laparoscopic-assisted versus open distal gastrectomy since 2000.

METHODS

A comprehensive search of MEDLINE and EMBASE was conducted including studies published between 2000 and present.

RESULTS

Seventeen studies with a total of 7,109 distal gastrectomies (3,496 lap vs 3,613 open) were included. Across all studies, postoperative morbidity rates for laparoscopic gastrectomy were lower than that of open [median (range) 10 (0-36) % vs 17 (0-43) %]. Meta-analysis of postoperative morbidity rates in prospective studies only yielded pooled odds ratio of 0.52 (95 % CI 0.33-0.81) (P = 0.004). In-hospital mortality rates were comparable between the two (range: laparoscopic 0-3.3 vs open 0-6.7 %). The long-term oncological outcomes of resection were difficult to analyze given variable reporting but appeared similar between the two. Meta-analysis of prospective studies showed that laparoscopic-assisted distal gastrectomy was associated with significantly shorter hospital length of stay [standard mean difference (SMD) = -0.78 (95 % CI = -1.0 to -0.56)], comparable intraoperative bleeding [SMD = 0.64 (95 % CI = -1.3-0.0430) P = 0.066] and longer operative time compared to open gastrectomy [1.9 (95 % CI 0.05-3.8) P = 0.045, with P < 0.001].

CONCLUSION

This study supports the use of laparoscopic-assisted distal gastrectomy for treatment of gastric adenocarcinoma with evidence of comparable, if not better, short-term postoperative parameters when compared to open distal gastrectomy. The long-term oncological outcomes appear similar but may require more evaluation.

The learning curve of laparoscopic treatment of rectal cancer does not increase morbidity

INTRODUCTION

The treatment of rectal cancer via laparoscopy is controversial due to its technical complexity. Several randomized prospective studies have demonstrated clear advantages for the patient with similar oncological results to those of open surgery, although during the learning of this surgical technique there may be an increase in complications and a worse prognosis.

OBJECTIVE

Our aim is to analyze how the learning curve for rectal cancer via laparoscopy influences intra- and postoperative results and oncological markers. A retrospective review was conducted of the first 120 patients undergoing laparoscopic surgery for rectal neoplasia. The operations were performed by the same surgical team with a wide experience in the treatment of open colorectal cancer and qualified to perform advanced laparoscopic surgery. We analyzed sex, ASA, tumour location, neoadjuvant treatment, surgical technique, operating time, conversion, postoperative complications, length of hospital stay, number of lymph nodes, stage and involvement of margins.

RESULTS

Significant differences were observed with regard to surgical time (224 min in the first group, 204 min in the second group), with a higher rate of conversion in the first group (22.5%) than in the second (11.3%). No significant differences were noted for rate of conservative sphincter surgery, length of hospital stay, post-surgical complications, number of affected/isolated lymph nodes or affected circumferential and distal margins.

CONCLUSIONS

It is possible to learn this complex surgical technique without compromising the patient's safety and oncological outcome.

Factors affecting morbidity after conversion of laparoscopic colorectal resections

BACKGROUND

The impact of conversion on postoperative outcomes of laparoscopic colorectal surgery remains controversial. The purpose of this study was to assess whether a conversion results in increased postoperative morbidity and mortality, and to evaluate whether any specific factors affect the outcomes of converted procedures.

METHODS

Outcomes of procedures requiring conversion among patients undergoing elective laparoscopic colorectal resection between 1992 and 2011 were compared with those for operations completed laparoscopically. Subset analyses were also performed to evaluate the selective impact of patient-, disease- and treatment-related factors and the timing of conversion during surgery on outcomes. Primary endpoints were postoperative mortality and morbidity.

RESULTS

Of 2483 patients undergoing laparoscopic colorectal resection, 270 (10.9 per cent) required conversion to open surgery. The 30-day postoperative mortality rate was comparable after laparoscopically completed and converted procedures (0.4 versus 0 per cent respectively; P = 0.610). Factors significantly associated with morbidity after conversion were smoking, cardiovascular co-morbidity, previous abdominal operations (particularly colectomy or hysterectomy) and adhesions. Overall morbidity was not affected by conversion (27.0 per cent at 30 days in both groups; P > 0.999). However, patients experiencing morbidity tended to have had earlier conversions: median (range) 40 (15-90) min into surgery versus 50 (15-240) min for those who did not develop morbidity (P = 0.006). The risk of reoperation for postoperative morbidity was higher following conversion because of complications (13 versus 2.9 per cent; P = 0.024).

CONCLUSION

Conversions of laparoscopic colorectal resection are not associated with increased overall morbidity, regardless of the timing of conversion.

Laparoscopic surgery for rectal cancer: current status and future perspective

Although laparoscopic surgery for colon cancer is accepted in the treatment guidelines, the laparoscopic approach for rectal cancer is recommended only in clinical trials. Thus far, several trials have shown favorable short-term results such as early recovery and short hospital stay, but long-term results remain a critical concern for laparoscopic rectal cancer surgery. To date, no randomized control trials have shown an increased local recurrence after laparoscopic surgery for rectal cancer. Additionally, according to previous studies, open conversion, which is more frequent in laparoscopic rectal surgery than in laparoscopic colon surgery, may affect short-term and long-term survival. The evidence on male sexual function has been contradictory. Long-term results from ongoing multicenter trials will be available within several years. Based on accumulated evidence from well-organized clinical trials, laparoscopic surgery will likely be accepted as a treatment choice for rectal cancer. In the future, extended laparoscopic rectal surgery might be feasible for additional procedures such as laparoscopic lateral pelvic lymph node dissection and laparoscopic total pelvic exenteration for rectal cancer invading the adjacent pelvic organ.