Abstract
Background
While guidelines for laparoscopic abdominal surgery advise using the lowest possible intra-abdominal pressure, commonly a standard pressure is used. We evaluated the feasibility of a predefined multifaceted individualized pneumoperitoneum strategy aiming at the lowest possible intra-abdominal pressure during laparoscopic colorectal surgery.
Methods
Multicenter prospective study in patients scheduled for laparoscopic colorectal surgery. The strategy consisted of ventilation with low tidal volume, a modified lithotomy position, deep neuromuscular blockade, pre-stretching of the abdominal wall, and individualized intra-abdominal pressure titration; the effect was blindly evaluated by the surgeon. The primary endpoint was the proportion of surgical procedures completed at each individualized intra-abdominal pressure level. Secondary endpoints were the respiratory system driving pressure, and the estimated volume of insufflated CO2 gas needed to perform the surgical procedure.
Results
Ninety-two patients were enrolled in the study. Fourteen cases were converted to open surgery for reasons not related to the strategy. The intervention was feasible in all patients and well-accepted by all surgeons. In 61 out of 78 patients (78%), surgery was performed and completed at the lowest possible IAP, 8 mmHg. In 17 patients, IAP was raised up to 12 mmHg. The relationship between IAP and driving pressure was almost linear. The mean estimated intra-abdominal CO2 volume at which surgery was performed was 3.2 L.
Conclusion
A multifaceted individualized pneumoperitoneum strategy during laparoscopic colorectal surgery was feasible and resulted in an adequate working space in most patients at lower intra-abdominal pressure and lower respiratory driving pressure.
ClinicalTrials.gov (Trial Identifier: NCT03000465).
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Guidelines for laparoscopic abdominal surgery recommend using the lowest possible intra-abdominal pressure (IAP) at which the surgeon has adequate workspace rather than using a standard level of IAP [1, 2]. In clinical practice, though, IAP is typically set between 12 and 15 mmHg throughout the entire surgical procedure [3]. Using the lowest possible IAP could be beneficial, as high IAP is associated with peritoneal damage, impaired splanchnic, hepatic and abdominal wall perfusion, decreased gastric mucosal oxygen saturation, and postoperative pain [4,5,6,7,8]. However, a low IAP could result in unacceptable surgical conditions, which could not only lengthen duration of surgery but also increase the risk of complications, eventually worsening outcomes [9, 10].
Surgical workspace is linked to the intra-abdominal volume (IAV), the amount of insufflated CO2 gas to create the pneumoperitoneum. The IAV needed has been related to multiple but foremost modifiable factors [11]. Indeed, factors like neuromuscular blockade, pre-stretching of the abdominal wall, and patient positioning have been shown to affect the relationship between IAP and workspace [12,13,14,15,16,17,18,19,20,21,22,23,24]. Besides, ventilation-induced changes in intra-thoracic pressures and probably individual patient factors might impact IAP. All these factors have been studied before, but were never addressed neither investigated together.
Thus, we performed the ‘Individualized PneumoPeritoneum pressure in Colorectal Laparoscopic Surgery’ (IPPColLapSe) study to investigate whether a multifaceted individualized strategy, focusing on optimizing the combination of factors mentioned above during laparoscopic abdominal surgery. We were interested in its feasibility, but also the lowest IAP at which surgery could be performed using this strategy. Specifically, we assessed the proportion of patients in whom surgery was performed and completed at each individualized IAP level. We also determined the association between changes in IAP and intra-thoracic pressures, and estimated the IAV at which the laparoscopic procedure was performed. We hypothesized that a multifaceted individualized pneumoperitoneum strategy would result in lower IAP with adequate workspace for surgeons during laparoscopic colorectal surgery.
Materials and methods
Design
The IPPColLapSe study was an investigator-initiated multicenter prospective cohort investigation performed between May 2015 and October 2016 in three Spanish hospitals: The Hospital Universitario y Politécnico La Fe, Valencia, the Hospital General de Castellón, Castellon, and the Hospital Universitario Gregorio Marañon, Madrid. The study protocol was approved by the Institutional Review Boards (IRB) of all three hospitals (protocol number: 2015/0094). The trial was registered with ClinicalTrials.gov (Trial Identifier: NCT03000465). Written informed consent was obtained from all participants before surgery.
Population
Patients were eligible for participation if (a) scheduled for laparoscopic colorectal surgery; (b) age > 18-year-old; and (c) American Society of Anesthesiologists (ASA) physical status I to III, with no cognitive deficits. Exclusion criteria included the following: (a) emergency or unplanned surgery; (b) impossibility to obtain written informed consent; and (c) allergy to, or contraindication for rocuronium or sugammadex. Women who were pregnant or breastfeeding, patients with known immunologic or neuromuscular diseases, and patients with an advanced stage of cardiopulmonary, renal, or hepatic diseases were excluded from participation.
Standard procedures
After initiation of standard monitoring and continuous neuromuscular monitoring (TOF-Watch–SX™, Organon-Teknika, Oss, The Netherlands), anesthesia was induced using propofol (1.5 to 2 mg kg−1) plus fentanyl (1 µg kg−1). Tracheal intubation was facilitated with rocuronium 0.6 mg kg−1. Anesthesia was maintained using propofol infusion titrated to a bispectral index (BIS, BIS™, Covidien, Mansfield, MA, USA) between 40 and 60. Additional fentanyl boluses (1 µg kg−1) were used for intraoperative analgesia. An electronic CO2 gas insufflator (Endoflator™, Karl Storz, Tuttlingen, Germany) was used for CO2 insufflation into the abdominal cavity through a paraumbilical-placed laparoscopic trocar.
Intervention
The following predefined interventions, as part of the multifaceted individualized pneumoperitoneum strategy, were performed in all patients, in the same order:
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1.
Tidal volume reduction with volume controlled ventilation mode to 8 ml kg−1 of predicted ideal body weight (PBW), 20% inspiratory pause, positive end-expiratory pressure (PEEP) set at 5 or 10 mm Hg, in patients with a body mass index (BMI) < 30 or > 30 kg m−2, respectively, oxygen inspiratory fraction 0.8 and respiratory rate 12 to 15 respirations per minute to maintain standard end-tidal CO2 values [25].
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2.
A ‘modified lithotomy position’ with slightly flexed hips (45–90°) respect to patients’ legs raised in padded supports. This increases the anteroposterior intra-abdominal space by correcting lumbar lordosis;
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3.
Continuous deep neuromuscular blockade throughout surgery to maintain a train-of-four (TOF) of 0 and post-tetanic count (PTC) between 1 and 5;
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4.
Pre-stretching of the abdominal wall muscles, setting pneumoperitoneum at 15 mmHg for a maximum of 5 min during initial CO2 gas insufflation and trocars insertion; (insufflator initially set at 15 mmHg with an initial flow rate of 3 l min−1);
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5.
Individualized IAP titration. After pre-stretching, the patient was placed in the 20° Trendelemburg position. Flow rate was set at 30 l min−1 and the surgery began. The IAP was initially decreased from 15 to 12 mmHg, and then stepwise to 11, 10, 9, and finally 8 mmHg. IAP was allowed to stabilization after each step, lasting usually 3 to 5 min. Surgeons were blinded to the actual IAP used, and could request at any time to increase IAP, if workspace became ‘non-adequate.’ If deemed necessary, this increment was done in 1 mmHg steps lasting at least 1 min, up to the level at which the surgical workspace became adequate with an upper limit of 15 mm Hg. While it is common that the surgeon decides on the level of IAP to be used, here an anesthesiologist managed the pneumoperitoneum insufflator and surgeons remained blinded to the level of IAP used.
Data collected
Data on weight, sex, height, age, gender, body mass index (BMI), number of pregnancies, number of previous laparoscopic surgeries, and type and duration of surgery were collected. IAP was measured at every liter during pneumoperitoneum insufflation until 15 mmHg level was reached. We also measured the IAV of CO2 gas insufflated at 15 mmHg. Ventilation parameters were collected at each down titration step of IAP. Parameters recorded included PEEP, peak pressure (Ppeak) and plateau pressure (Pplat), and respiratory system compliance (CRS).
Definitions
The ‘individualized IAP’ was defined as the highest IAP needed to obtain and maintain an adequate workspace until completion of surgery. ‘Adequate workspace’ was defined as the workspace sufficient to perform the surgical procedure with no need for corrective measures (IAP increment) as judged by the operating surgeon. Consequently, ‘non-adequate workspace’ was defined as workspace insufficient to perform the surgical procedure with the need for corrective measures. Surgeons were kept blinded to the actual level of IAP used at any time during the surgical procedure, but were advised if the level was over the predefined upper limit.
The ‘respiratory system driving pressure’ (ΔPRS) was calculated by subtracting PEEP from Pplat. The optimized IAV was defined as the ‘volume of insufflated CO2 at the individualized IAP’ and was estimated from the IAP/IAV curve for each patient during insufflation.
Endpoints
The primary endpoint was the proportion of patients at each level of individualized IAP. Secondary endpoints were ventilation parameters evaluation during the stepwise IAP deflation, including Ppeak, Pplat and PEEP, and the ΔPRS, and IAV estimation at the individualized IAP.
Sample size calculation
Assuming that surgery can be performed with a mean IAP of 9 mmHg with standard deviation (SD) of 1.9 (pilot unpublished study, laparoscopic colorectal surgery), 78 patients would be included to assess the individualized IAP with 95% confidence and achieving an accuracy of ± 0.5 in the determination of the 50th percentile, ± 0.55 in the 25th and 75th percentiles and of ± 0.65 in the 10th and 90th percentiles.
If conversion to open surgery was decided, the patient was excluded from the analysis of the primary outcome, and replaced with a new patient until 78 patients were enrolled and completed the study concerning the primary endpoint. Patients in whom surgeons decided to convert to open surgery remained analyzable for the other endpoints.
Analysis plan and statistical analyses
Data were expressed as mean (SD) or median [IQR] for continuous variables and by counts and proportions for categorical variables with. The 95% confidence intervals were calculated for each of the estimated percentiles.
The proportion of patients in whom surgery was finished at each IAP level was first analyzed. Next, the relationship between IAP and ventilation parameters, in particular, ΔPRS was calculated. For this calculation, a quantile regression model with splines for the median and 10th and 90th percentiles, adding BMI and age as covariates, was adjusted.
The relationship between IAP and the insufflated volume of CO2 was determined for each patient during initial pneumoperitoneum insufflation until an IAP of 15 mmHg was reached. The optimized IAV was estimated from data in patients in whom surgery was finished by laparoscopy. The relationship between IAP and IAV was analyzed by linear interpolation from the individual IAP/IAV curves. The IAP before CO2 gas insufflation was considered the basal IAP or intra-abdominal pressure at volume zero, and was estimated by fitting multiadaptive linear regression splines to intra-abdominal volume and pressure relationship.
We performed a posthoc analysis fitting a linear mixed model with surgeon as random effect to determine factors that influenced the optimized IAV. The factors tested in the model included: Age, gender, BMI, pregnancies, previous laparoscopic or open surgeries, type of surgery (right or left hemicolectomy, rectum or other surgeries), IAV at 15 mmHg of IAP, and intra-abdominal pressure at volume zero (Pv0) were included.
Statistical analyses were performed with R statistical software version 3.3.3 (R Foundation for Statistical Computing, Vienna, Austria).
Results
Patients
Ninety-two patients were finally enrolled. Fourteen procedures were converted to open surgery (Fig. 1). In all cases, the surgeons confirmed that the decision to conversion was not related to the IPP. All other 78 patients could be followed to the primary endpoint of the study. Baseline characteristics are presented in Table 1. Surgeons experience is detailed in eTable1.
Feasibility
The multifaceted and individualized strategy was feasible in all 92 enrolled patients, resulting in adequate workspace for the surgeon in all cases. Seventy-eight patients fulfill criteria to be analyzed for the primary endpoint. In 61 patients (78% [95% CI 70–89%]), the lowest IAP was 8 mmHg until the end of surgery. In the remainder 17 patients, uptitration was necessary during surgery, up to IAPs between 9 and 12 mmHg (Fig. 2).
The median optimized IAV of insufflated CO2 was 3.2 [2.7–4.2] liters, or 58 [49–67] ml kg−1 body weight (eFigure 1 and eFigure 2).
Relationship between IAP and ΔPRS
The relationship between IAP and ΔPRS was almost linear (Fig. 3 and eTable 2)., every reduction in IAP of 1 mmHg resulted in a reduction in ΔPRS of 0.74 cmH2O (or 0.56 mm Hg) between 8 and 15 mmHg.
Relationship between IAP and volume of insufflated CO2 gas
A nonlinear relationship between IAP and volume of insufflated gas was found (Fig. 4). A breakpoint in the IAP/IAV at 10 mmHg (mean) was observed between 8 and 15 mm Hg IAP.
Posthoc analysis
Mainly, the volume of CO2 insufflated at 15 mm Hg of IAP during pneumoperitoneum generation and Pv0 were associated with the optimized IAV (eTable 3).
Discussion
The findings of this study in patients undergoing laparoscopic colorectal surgery can be summarized as follows: (a) the tested multifaceted individualized strategy was feasible; (b) resulted in an adequate workspace throughout surgery, and (c) allows to use lower IAP than frequently selected for pneumoperitoneum in most patients. Moreover, lowering IAP resulted in (d) a substantial decrease of ΔPRS; and (e) an optimized IAV close to 3 liters. Finally, (f) a decrease in abdominal compliance was identified at a mean IAP of 10 mm Hg.
This study tested the feasibility of a multifaceted and individualized intervention focusing on IAP in colorectal laparoscopic surgery. The multidisciplinary teamwork with close collaboration between surgeons and anesthesiologist allowed us to develop and perform this study. Over ten surgeons participated in this study, external validity of results was warranted provided the range of surgeons’ experience in colorectal laparoscopic surgery. There have been no prior studies in which the relation between IAP and IAV was determined for each individual patient.
Since we tested a multifaceted strategy, with five different elements, it remains uncertain what exactly allowed us to reduce IAP, i.e., which one factor had the biggest impact. Previous studies tested the individual elements, but there were no investigations that combined all five items into one bundle.
The impact of ventilator settings on IAP, and vice versa has been extensively studied in the critical care setting, but not in laparoscopic abdominal surgery, in the tested strategy we deliberately choose using low tidal volume to decrease the impact on IAV [25]. One study in 20 patients under bariatric laparoscopic surgery showed that, in supine position, raising the legs to a modified lithotomy position increased the IAV generated during pneumoperitoneum, the effect being more important in Trendelenburg position [26]. Deep neuromuscular blockade throughout the surgical procedure has been compared with moderate or no blockade, studies offering inconclusive results, or marginal gains [12,13,14,15,16]. Seven randomized clinical trials comparing deep versus moderate neuromuscular blockade showed positive effects on surgical conditions during retroperitoneal laparoscopic procedures [17], laparoscopic donor nephrectomy [18], and laparoscopic hysterectomy [19], and a marginally positive effect in laparoscopic cholecystectomy [20,21,22,23,24]. In laparoscopic cholecystectomies, the percentage of procedures finished at low IAP was 60% with deep neuromuscular blockade versus 35% with moderate neuromuscular blockade [20]. On the other hand, pre-stretching of the abdominal wall muscles has only been evaluated in animal studies, showing an increase in IAV, when insufflated at 15 mmHg, with a more important effect at lower IAP [27]. Finally, individually IAP titration has been studied in two investigations at different levels of neuromuscular blockade. In a prospective observational study in 20 patients undergoing laparoscopic cholecystectomy, deep versus no neuromuscular blockade allowed a decrease in mean IAP of 6 mm Hg (starting with 13 mmHg), but a further increase in 3 mm Hg after 15 min was necessary [28]. In a clinical trial including 61 patients undergoing colorectal laparoscopic surgery, moderate neuromuscular blockade was compared with deep neuromuscular blockade. Deep neuromuscular blockade resulted in a lower mean IAP (9 mm Hg) [29]. In our study, we combined all measures into a multifaceted individualized IAP strategy, resulting in lower levels of IAP.
In recent studies, ΔPRS has been shown to be independently associated with the development of postoperative pulmonary complications (PPC) in surgical patients [30]. It is known that pneumoperitoneum insufflation decreases chest wall compliance, impairing respiratory function [31, 32]. Studies in animal models have further shown a 40 to 50% transmission of IAP to the intra-thoracic one, and thus on ventilation pressures [33, 34]. Of note, there have been no studies in humans yet, and the impact of IAP on ΔPRS in the laparoscopic surgery setting remains to be explored, we tested the impact of our strategy on the resulting relationship between IAP and ΔPRS. The results suggest a transmission rate of 56% at clinically relevant pressure ranges for laparoscopy (i.e., 8–15 mmHg). Although the design of a comprehensive protective ventilation strategy is beyond the scope of the present investigation, its results suggest that an individualized multifaceted strategy aimed at lowering IAP during laparoscopy could benefit patients through a lower ΔPRS.
The relationship between IAP and IAV is often considered to be linear during laparoscopic surgery in the 12 to 15 mmHg range [35, 36]. However, we observed a ‘breakpoint’ at IAP of 10 mm Hg. It would be interesting to identify it to avoid IAP increases that correlate with minor or no IAV increases at all, i.e., no clinical benefit.
The present study reported the precise IAV needed to perform lower abdominal laparoscopic surgery. Our results are in line with results reported for upper abdominal bariatric laparoscopic surgery. Indeed, an IAV of 3 l seems to be the threshold for optimal surgical conditions [26]. Being aware of the optimized IAV allows a goal directed initial insufflation of CO2. Future CO2 insufflators may include automatic and real-time determination of the relationship between IAP and IAV to allow better individualization of IAP throughout the entire surgical procedure.
This study has several limitations. Although the surgeons confirmed that the reasons for conversion to open surgery were independent from the tested intervention, we cannot be certain this was really the case. Of note, in none of these patients, was there a request to increase the IAP. A conversion rate of ~ 15% is commonplace for this type of surgery [37]. We tested a bundle of measures, some of them could be standard of care, and, as mentioned above, it remains uncertain which of those factors had the biggest impact on IAP. Surgeons were blinded for the IAP but not for the patient’s inclusion in the study. As dictated by the study protocol, IAP downtitration stopped at 8 mmHg while in some patients a lower IAP could still have resulted in acceptable workspace for the surgeon. Again, in the patients with highest intra-abdominal volume during pneumoperitoneum insufflation, the optimized calculated Intra-abdominal volume at individualized IAP was probably higher than needed. In this real-life study with several study centers and several surgeons involved, there is a possibility of significant variability in the surgeon’s comfort level with respect to available workspace, (efigure1 and efigure2). Blinded surgeons evaluate surgical conditions in a practical dichotomous manner as adequate or not depending on whether they needed any corrective action. This makes comparison with other studies as those using the Leiden-Surgical Rating Scale, difficult [17, 18]. We did not use oesophageal catheters to estimate intrapleural pressures. The transpulmonary pressure ΔP, calculated from intrapleural pressures, could be more informative than the ΔPRS. Besides, clinical outcomes after surgery were not evaluated.
As conclusion, a multifaceted individualized pneumoperitoneum strategy was feasible and resulted in an adequate workspace for surgeons at lower IAP than usually applied during laparoscopic colorectal surgery. Furthermore, through intra-abdominal pressure optimization, lower respiratory driving pressure was achieved. Benefits of the tested intervention on patient recovery and perioperative morbidity must be tested in randomized controlled trials.
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Acknowledgements
We acknowledge the support of surgery, anesthesia, and administrative staff at the Hospital Universitario y Politecnico La Fe in Valencia, the Hospital General de Castellon in Castellon, and the Hospital Universitario Gregorio Marañon in Madrid, Spain, during this study and a special mention to David Hervás from Data Science and Biostatistics IISLaFe for the assistance with the data analysis.
IPPColLapSe study collaborators group members: Salvador Pous Ph.D. (salvadorpous@hotmail.com), Cristina Ballester Ph.D. (cris7balle@yahoo.es), Matteo Frasson Ph.D. (dr.frasson.matteo@gmail.com), Alvaro García-Granero Ph.D. (alvarogggt@hotmail.com), Carlos Cerdán Santacruz M.D. (carloscerdansantacruz@hotmail.com), Eduardo García-Granero Ph.D. (eggranero@telefonica.net), Luis Sanchez Guillen M.D. (drsanchezguillen@gmail.com), Anabel Marqués Marí Ph.D. (amarquesmari@gmail.com), David Casado Rodrigo M.D. (dcasador@hotmail.com), Joan Gibert Gerez M.D. (jgibertgerez@me.com), Rebeca Cosa Rodríguez M.D. (rebecacosa@hotmail.com), Mª de los Desamparados Moya Sanz M.D. (desampa.moya@gmail.com), Marcos Rodriguez Martín M.D. (marcosrodmar@hotmail.com), Jaime Zorrilla Ortúzar M.D. (jzorrillaortuzar@gmail.com), José María Pérez-Peña M.D. (jppena@salud.madrid.org), Maria Jose Alberola Estellés M.D. (majoni2000@yahoo.es), Begoña Ayas Montero Ph.D. (bego_ayas@hotmail.com), Salome Matoses Jaen M.D. (smatosesj@gmail.com), Sandra Verdeguer Ph.D. (sandraverdeguer@hotmail.com), Michiel. Warlé M.D. (Michiel.Warle@radboudumc.nl), David Cuesta Frau Ph.D. (dcuesta@disca.upv.es.)
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Support was provided solely from institutional and/or departmental sources.
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O.D.C: Study design, acquisition, analysis and interpretation of data, drafting and revision of paper. B.F.L: Study design, acquisition, analysis and interpretation of data, drafting and revision of paper. G.M: Study design, analysis and interpretation of data, drafting and revision of paper. M.V.M: Study design, acquisition and interpretation of data, and revision of paper. N.G.G: Study design, acquisition and interpretation of data, and revision of paper. D.R.H: Study design, acquisition and interpretation of data, and revision of paper. L.E.O.A: Study design, acquisition and interpretation of data, and revision of paper. M.P.A.N: Study design, interpretation of data, and revision of paper. M.J.S: Analysis and interpretation of data, drafting and revision of paper. C.L.E.O: Study design, analysis and interpretation of data, drafting and revision of paper.
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Oscar Diaz-Cambronero (oscardiazcambronero@gmail.com) has received speakers’ fees and honoraria from Merck Sharp & Dohme for lectures (approximately amount: 8.000 euros) and also received a research grant from Merck Sharp & Dohme of 80.000 euros not related to this study. Blas Flor Lorente (blasflor@hotmail.com) has received speakers’ fees and honoraria from Merck Sharp & Dohme for lectures (approximately amount: 3.000 euros). Guido Mazzinari (gmazzinari@gmail.com) declares no competing interests. Maria Vila Montañes (mvilamontanes@yahoo.es) declares no competing interests. Nuria Garcia Gregorio (nuriagcia6@gmail.com) declares no competing interests. Daniel Robles Hernandez (drobher@gmail.com) declares no competing interests. Luis Enrique Olmedilla Arnal (lolmedilla@gmail.com) declares no competing interests. Maria Pilar Argente Navarro (argente_marnav@gva.es) has received speakers’ fees and honoraria for lectures from Merck Sharp & Dohme (approximately amount: 1.000 euros). Marcus J. Schultz (marcus.j.schultz@gmail.com) declares no competing interests. Carlos L. Errando (errando013@gmail.com) has received speakers’ fees and honoraria for lectures from Merck Sharp & Dohme. (approximately amount: 1.000 euros).
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Members of the IPPColLapSe study group are shown in Acknowledgements.
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Diaz-Cambronero, O., Flor Lorente, B., Mazzinari, G. et al. A multifaceted individualized pneumoperitoneum strategy for laparoscopic colorectal surgery: a multicenter observational feasibility study. Surg Endosc 33, 252–260 (2019). https://doi.org/10.1007/s00464-018-6305-y
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DOI: https://doi.org/10.1007/s00464-018-6305-y