BackgroundIn neurosurgical patients, the risk of developing venous thromboembolism (VTE) is high due to the relatively long duration of surgical interventions, usually long immobilization time... Show moreBackgroundIn neurosurgical patients, the risk of developing venous thromboembolism (VTE) is high due to the relatively long duration of surgical interventions, usually long immobilization time after surgery, and possible neurological deficits which can negatively influence mobility. In neurosurgical clinical practice, there is lack of consensus on optimal prophylaxis against VTE, mechanical or pharmacological.ObjectiveTo systematically review available literature on the incidence of VTE in neurosurgical interventions and to establish an optimum prevention strategy.MethodsA literature search was performed in PubMed, Embase, Web of Science, Cochrane Library, and EmCare, based on a sensitive search string combination. Studies were selected by predefined selection criteria, and risk of bias was assessed by Newcastle-Ottawa Quality Assessment Scale and Cochrane risk of bias.ResultsTwenty-five studies were included, half of which had low risk of bias (21 case series, 3 comparative studies, 1 RCT). VTE was substantially higher if the evaluation was done by duplex ultrasound (DUS), or another systematic screening method, in comparison to clinical evaluation (clin). Without prophylaxis DVT, incidence varied from 4 (clin) to 10% (DUS), studies providing low molecular weight heparin (LMWH) reported an incidence of 2 (clin) to 31% (DUS), providing LMWH and compression stockings (CS) reported an incidence of 6.4% (clin) to 29.8% (DUS), and providing LMWH and intermittent pneumatic compression devices (IPC) reported an incidence of 3 (clin) to 22.3% (DUS). Due to a lack of data, VTE incidence could not meaningfully be compared between patients with intracranial and spine surgery. The reported incidence of pulmonary embolism (PE) was 0 to 7.9%.ConclusionLow molecular weight heparin, compression stockings, and intermittent pneumatic compression devices were all evaluated to give reduction in VTE, but data were too widely varying to establish an optimum prevention strategy. Systematic screening for DVT reveals much higher incidence percentages in comparison to screening solely on clinical grounds and is recommended in follow-up of neurosurgical procedures with an increased risk for DVT development in order to prevent occurrence of PE. Show less
ObjectiveTextbook outcome (TO) is a composite outcome measure used in surgical oncology to compare hospital outcomes using multiple quality indicators. This study aimed to develop TO as an outcome... Show moreObjectiveTextbook outcome (TO) is a composite outcome measure used in surgical oncology to compare hospital outcomes using multiple quality indicators. This study aimed to develop TO as an outcome measure to assess healthcare quality for patients undergoing cytoreductive surgery (CRS) for advanced-stage ovarian cancer.MethodsThis population-based study included all CRS for FIGO IIIC-IVB primary ovarian cancer registered in the Netherlands between 2017 and 2020. The primary outcome was TO, defined as a complete CRS, combined with the absence of 30-day mortality, severe complications, and prolonged length of admission (≥ten days). Delayed start of adjuvant chemotherapy (≥six weeks) was not included in TO because of missing data. Logistic regressions were used to assess the association of case-mix factors with TO. Hospital variation was displayed using funnel plots.ResultsA total of 1909 CRS were included, of which 1434 were interval CRS and 475 were primary CRS. TO was achieved in 54% of the interval CRS cohort and 47% of the primary CRS cohort. Macroscopic residual disease after CRS was the most important factor for not achieving TO. Age ≥ 70 was associated with lower TO rates in multivariable logistic regressions. TO rates ranged from 40% to 69% between hospitals in the interval CRS cohort and 22% to 100% in the primary CRS cohort. In both analyses, one hospital had significantly lower TO rates (different hospitals). Case-mix adjustment significantly affected TO rates in the primary CRS analysis.ConclusionsTO is a suitable composite outcome measure to detect hospital variation in healthcare quality for patients with advanced-stage ovarian cancer undergoing CRS. Case-mix adjustment improves the accuracy of the hospital comparison. Show less
Hulst, H.C. van der; Bol, J.M. van der; Bastiaannet, E.; Portielje, J.E.A.; Dekker, J.W.T. 2023
Background: Trends of surgical and non-surgical complications among the old, older and oldest patients after colorectal cancer (CRC) surgery could help to identify the best target outcome to... Show moreBackground: Trends of surgical and non-surgical complications among the old, older and oldest patients after colorectal cancer (CRC) surgery could help to identify the best target outcome to further improve postoperative outcome.Materials and methods: All consecutive patients >= 70 years receiving curative elective CRC resection between 2011 and 2019 in The Netherlands were included. Baseline variables and postoperative com-plications were prospectively collected by the Dutch ColoRectal audit (DCRA). We assessed surgical and non-surgical complications over time and within age categories (70-74, 75-79 and >= 80 years) and determined the impact of age on the risk of both types of complications by using multivariate logistic regression analyses. Results: Overall, 38648 patients with a median age of 76 years were included. Between 2011 and 2019 the proportion of ASA score >= 3 and laparoscopic surgery increased. Non-surgical complications signif-icantly improved between 2011 (21.8%) and 2019 (17.1%) and surgical complications remained constant (from 17.6% to 16.8%). Surgical complications were stable over time for each age group. Non-surgical complications improved in the oldest two age groups. Increasing age was only associated with non-surgical complications (75-79 years; OR 1.17 (95% CI 1.10-1.25), >= 80 years; OR 1.46 (95% CI 1.37-1.55) compared to 70-74 years), not with surgical complications. Conclusion: The reduction of postoperative complications in the older CRC population was predomi-nantly driven by a decrease in non-surgical complications. Moreover, increasing age was only associated with non-surgical complications and not with surgical complications. Future care developments should focus on non-surgical complications, especially in patients >= 75 years.(c) 2022 Elsevier Ltd, BASO -The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved. Show less
This thesis demonstrates that kidneys from DCD donors can be fully embraced, and that the perception of DCD kidney transplantation being inferior to DBD kidney transplantation – mainly motivated by... Show moreThis thesis demonstrates that kidneys from DCD donors can be fully embraced, and that the perception of DCD kidney transplantation being inferior to DBD kidney transplantation – mainly motivated by concerns regarding high incidences of DGF and EGL – is no longer justified. One explanation for this phenomenon is that outcomes of transplanted DCD kidneys have improved over time, with a similar incidence of EGL following DBD and DCD kidney transplantation in the current era. Another explanation is that both donor types have different biological responses to DGF: whilst DGF severely impacts on DBD graft survival, DGF has no impact on DCD graft survival. This difference relates to donor type-specific regulation of resilience and pro-inflammatory pathways benefitting the DCD graft and its outcomes. As such, the persistent high incidence of DGF in DCD grafts should not be regarded an impediment toward the use of these donor kidneys.This thesis additionally explores a series of physiological and methodological contrasts between preclinical and clinical I/R injury, that all may contribute to the impaired translatability of preclinical studies in clinical practice. Awareness of these pitfalls may help to improve study designs in future research, bringing us one step closer towards bridging the translational gap. Show less
Rooijakkers, M.J.P.; Li, W.W.L.; Stens, N.A.; Vis, M.M.; Tonino, P.A.L.; Timmers, L.; ... ; Royen, N. van 2022
Introduction The coronavirus disease 2019 (COVID-19) pandemic has put tremendous pressure on healthcare systems. Most transcatheter aortic valve implantation (TAVI) centres have adopted different... Show moreIntroduction The coronavirus disease 2019 (COVID-19) pandemic has put tremendous pressure on healthcare systems. Most transcatheter aortic valve implantation (TAVI) centres have adopted different triage systems and procedural strategies to serve highest-risk patients first and to minimise the burden on hospital logistics and personnel. We therefore assessed the impact of the COVID-19 pandemic on patient selection, type of anaesthesia and outcomes after TAVI. Methods We used data from the Netherlands Heart Registration to examine all patients who underwent TAVI between March 2020 and July 2020 (COVID cohort), and between March 2019 and July 2019 (pre-COVID cohort). We compared patient characteristics, procedural characteristics and clinical outcomes. Results We examined 2131 patients who underwent TAVI (1020 patients in COVID cohort, 1111 patients in pre-COVID cohort). EuroSCORE II was comparable between cohorts (COVID 4.5 +/- 4.0 vs pre-COVID 4.6 +/- 4.2, p = 0.356). The number of TAVI procedures under general anaesthesia was lower in the COVID cohort (35.2% vs 46.5%, p < 0.001). Incidences of stroke (COVID 2.7% vs pre-COVID 1.7%, p = 0.134), major vascular complications (2.3% vs 3.4%, p = 0.170) and permanent pacemaker implantation (10.0% vs 9.4%, p = 0.634) did not differ between cohorts. Thirty-day and 150-day mortality were comparable (2.8% vs 2.2%, p = 0.359 and 5.2% vs 5.2%, p = 0.993, respectively). Conclusions During the COVID-19 pandemic, patient characteristics and outcomes after TAVI were not different than before the pandemic. This highlights the fact that TAVI procedures can be safely performed during the COVID-19 pandemic, without an increased risk of complications or mortality. Show less
Olthof, E.P.; Wenzel, H.; Velden, J. van der; Spijkerboer, A.M.; Bekkers, R.; Beltman, J.J.; ... ; Mom, C. 2022
Objective Treatment strategies for bulky lymph nodes in patients with locally advanced cervical cancer scheduled for definitive chemoradiation include nodal boosting with radiotherapy, surgical... Show moreObjective Treatment strategies for bulky lymph nodes in patients with locally advanced cervical cancer scheduled for definitive chemoradiation include nodal boosting with radiotherapy, surgical debulking, or both. The aim of this retrospective cohort study was to compare survival and toxicity in patients receiving these treatments and to compare them with a group that received neither form of treatment. Methods Women diagnosed between January 2009 and January 2017 with International Federation of Gynecology and Obstetrics (FIGO) 2009 stage IB2, IIA2-IVA cervical cancer with lymph nodes >= 1.5 cm without upper limit on pretreatment imaging and treated with definitive chemoradiation were selected from the Netherlands Cancer Registry. Patients were categorized by intention-to-treat strategy: boosting, debulking, or neither treatment, with subgroup analysis for patients receiving both treatments, that is, debulking with boosting. Overall and relapse-free survival outcomes were compared by Kaplan-Meier and Cox regression analyses and toxicity by logistic regression analysis. Results Of 190 patients, 101 (53%) received only nodal boosting, 31 (16%) debulking alone, 29 (15%) debulking combined with boosting, and 29 (15%) received neither treatment. The 5 year overall and relapse-free survival for the treatment groups were 58%, 45% and 45% (p=0.19), and 47%, 44% and 46% (p=0.87), respectively. Multivariable Cox regression analyses demonstrated no differences in overall and relapse-free survival. Combination of debulking with boosting was associated with decreased overall and relapse-free survival compared with debulking alone (HR 2.47, 95% CI 1.22 to 5.00; and HR 2.37, 95% CI 1.14 to 4.93). Nodal boosting was independently associated with a decreased toxicity risk compared with debulking strategy (OR 0.37, 95% CI 0.16 to 0.83). Conclusions This study showed no survival benefit from either nodal boosting or debulking strategy in patients with suspicious bulky nodes. Nodal boosting might, however, be associated with less toxicity. Dual treatment with debulking and boosting showed a worse survival outcome because this group probably represents patients with poor prognostic factors. Show less
Background: Complications after colorectal cancer surgery can worsen long-term survival. The aim of this nationwide study was to determine the impact of different types of complications on overall... Show moreBackground: Complications after colorectal cancer surgery can worsen long-term survival. The aim of this nationwide study was to determine the impact of different types of complications on overall survival (OS) and conditional survival if still alive one year postoperatively (CS-1) after colorectal cancer surgery.Materials and methods: All patients registered in the Dutch ColoRectal Audit after resection of primary colorectal cancer between 2011 and 2017 and with known survival status were included. Multivariable Cox regression models were used to assess the association of complications with OS and CS-1, thereby calculating the Hazard Ratio (HR) with 95% Confidence Interval.Results: 43,908 colon and 16,955 rectal cancer patients were included. Median follow-up time was 66.1 and 66.5 months, respectively. Five-year OS after colon cancer resection was 73.2% without complications, and 65.4% with surgical, 52.9% with non-surgical and 51.8% with combined type of complications (p < 0.001). Corresponding 5-year OS for rectal cancer patients was 76.9%, 72.7%, 64.9%, and 63.2% (p < 0.001). In colon cancer, multivariable analyses revealed HR 1.198 (1.136-1.264) for surgical, HR 1.489 (1.423-1.558) for non-surgical and HR 1.590 (1.505-1.681) for combined type of complications. For rectal cancer, these HRs were 1.193 (1.097-1.2297), 1.456 (1.346-1.329), and 1.489 (1.357-1.633). Surgical complications were associated with worse CS-1 in rectal cancer (HR 1.140 (1.050-1.260), but not in colon cancer (HR 1.007 (0.943-1.075)).Conclusion: Non-surgical complications have higher impact on survival than surgical complications. The impact of surgical complications on survival was still measurable after surviving the first year in rectal cancer but not in colon cancer patients. (C) 2021 Elsevier Ltd, BASO -The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved. Show less
Study objective: To assess whether different intensities of intra-abdominal pressure and deep neuromuscular blockade influence the risk of intra-operative surgical complications during laparoscopic... Show moreStudy objective: To assess whether different intensities of intra-abdominal pressure and deep neuromuscular blockade influence the risk of intra-operative surgical complications during laparoscopic donor nephrectomy.Design: A pooled analysis of ten previously performed prospective randomized controlled trials.Setting: Laparoscopic donor nephrectomy performed in four academic hospitals in the Netherlands: Radboudumc, Leiden UMC, Erasmus MC Rotterdam, and Amsterdam UMC.Patients: Five hundred fifty-six patients undergoing a transperitoneal, fully laparoscopic donor nephrectomy enrolled in ten prospective, randomized controlled trials conducted in the Netherlands from 2001 to 2017.Interventions: Moderate (tetanic count of four > 1) versus deep (post-tetanic count 1-5) neuromuscular blockade and standard (>= 10 mmHg) versus low (<10 mmHg) intra-abdominal pressure.Measurements: The primary endpoint is the number of intra-operative surgical complications defined as any deviation from the ideal intra-operative course occurring between skin incision and closure with five severity grades, according to ClassIntra. Multiple logistic regression analyses were used to identify predictors of intra- and postoperative complications.Main results: In 53/556 (9.5%) patients, an intra-operative complication with ClassIntra grade >= 2 occurred. Multiple logistic regression analyses showed standard intra-abdominal pressure (OR 0.318, 95% CI 0.118-0.862; p = 0.024) as a predictor of less intra-operative complications and moderate neuromuscular blockade (OR 3.518, 95% CI 1.244-9.948; p = 0.018) as a predictor of more intra-operative complications. Postoperative complications occurred in 31/556 (6.8%), without significant predictors in multiple logistic regression analyses.Conclusions: Our data indicate that the use of deep neuromuscular blockade could increase safety during laparoscopic donor nephrectomy. Future randomized clinical trials should be performed to confirm this and to pursue whether it also applies to other types of laparoscopic surgery. Show less
Hulst, H.C. van der; Bastiaannet, E.; Portielje, J.E.A.; Bol, J.M. van der; Dekker, J.W.T. 2021
Introduction: Frail patients with colorectal cancer (CRC) are at increased risk of complications after surgery. Prehabilitation seems promising to improve this outcome and therefore we evaluated... Show moreIntroduction: Frail patients with colorectal cancer (CRC) are at increased risk of complications after surgery. Prehabilitation seems promising to improve this outcome and therefore we evaluated the effect of physical prehabilitation on postoperative complications in a retrospective cohort of frail CRC patients. Methods: The study consisted of all consecutive non-metastatic CRC patients >70 years who had elective surgery from 2014 to 2019 in a teaching hospital in the Netherlands, where a physical prehabilitation program was implemented from 2014 on. We performed both an intention-to-treat and per protocol analysis to evaluate postoperative complications in the physical prehabilitation (PhP) and non-prehabilitation (NP) group. Results: Eventually, 334 elective patients were included. The 124 (37.1%) patients in the PhP-group presented with higher age, higher comorbidity scores and walking-aid use compared to the NP-group. Medical complications occurred in 26.6% of the PhP-group and in 20.5% of the NP-group (p = 0.20) and surgical complications in 19.4% and 14.3% (p = 0.22) respectively. In all frailty subgroups, the medical complications were lower in the PhP-group compared to the NP-group (35.9% vs. 45.5% for patients with >2 comorbidities, 36.2% vs. 39.1% for ASA score > III, 29.2% vs. 45.8% for walking-aid use). Differences were not significant. Conclusions: In this study, patients selected for physical prehabilitation had a worse frailty profile and therefore a higher a priori risk of postoperative complications. However, the postoperative complication rate was not increased compared to patients who were less frail at baseline and without prehabilitation. Hence, physical prehabilitation may prevent postoperative complications in frail CRC patients >70 years. (c) 2021 Elsevier Ltd, BASO -The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved. Show less
Introduction For decisions on glioblastoma surgery, the risk of complications and decline in performance is decisive. In this study, we determine the rate of complications and performance decline... Show moreIntroduction For decisions on glioblastoma surgery, the risk of complications and decline in performance is decisive. In this study, we determine the rate of complications and performance decline after resections and biopsies in a national quality registry, their risk factors and the risk-standardized variation between institutions. Methods Data from all 3288 adults with first-time glioblastoma surgery at 13 hospitals were obtained from a prospective population-based Quality Registry Neuro Surgery in the Netherlands between 2013 and 2017. Patients were stratified by biopsies and resections. Complications were categorized as Clavien-Dindo grades II and higher. Performance decline was considered a deterioration of more than 10 Karnofsky points at 6 weeks. Risk factors were evaluated in multivariable logistic regression analysis. Patient-specific expected and observed complications and performance declines were summarized for institutions and analyzed in funnel plots. Results For 2271 resections, the overall complication rate was 20 % and 16 % declined in performance. For 1017 biopsies, the overall complication rate was 11 % and 30 % declined in performance. Patient-related characteristics were significant risk factors for complications and performance decline, i.e. higher age, lower baseline Karnofsky, higher ASA classification, and the surgical procedure. Hospital characteristics, i.e. case volume, university affiliation and biopsy percentage, were not. In three institutes the observed complication rate was significantly less than expected. In one institute significantly more performance declines were observed than expected, and in one institute significantly less. Conclusions Patient characteristics, but not case volume, were risk factors for complications and performance decline after glioblastoma surgery. After risk-standardization, hospitals varied in complications and performance declines. Show less
Background: Low lumbar skeletal muscle mass and density have been associated with adverse outcomes in different populations with colorectal cancer (CRC). We aimed to determine whether skeletal... Show moreBackground: Low lumbar skeletal muscle mass and density have been associated with adverse outcomes in different populations with colorectal cancer (CRC). We aimed to determine whether skeletal muscle mass, density, and physical performance are associated with postoperative complications and overall survival (OS) in older CRC patients.Methods: We analysed consecutive patients (>= 70 years) undergoing elective surgery for non-metastatic CRC (stage I-III). Lumbar skeletal muscle mass and muscle density were measured using abdominal CT-images obtained prior to surgery. Low skeletal muscle mass and low muscle density were defined using commonly used thresholds and by gender-specific quartiles (Q). The preoperative use of a mobility aid served as a marker for physical performance. Cox regression proportional hazard models were used to investigate the association between the independent variables and OS.Results: 174 Patients were included (mean age 78.0), with median follow-up 2.6 years. 36 Patients (21%) used a mobility aid preoperatively. Low muscle density (Q1 vs Q4) and not muscle mass was associated with worse postoperative outcomes, including severe complications (p < 0.05). Use of a mobility aid was associated with more complications, including severe complications (39% vs 17%, p = 0.004) and OS (HR 2.65, CI 1.29-5.44, p = 0.01). However, patients with mobility aid use and low skeletal muscle mass had worse OS (HR 5.68, p = 0.003).Conclusion: Low skeletal muscle density and not muscle mass was associated with more complications after colorectal surgery in older patients. Physical performance has the strongest association for poor surgical outcomes and should be investigated when measuring skeletal muscle mass and density. (C) 2019 Elsevier Ltd, BASO similar to The Association for Cancer Surgery, and the European Society of Surgical Oncology. All rights reserved. Show less
Background Postoperative gastrointestinal leak and venous thromboembolism (VTE) are devastating complications of bariatric surgery. The performance of currently available predictive models for... Show moreBackground Postoperative gastrointestinal leak and venous thromboembolism (VTE) are devastating complications of bariatric surgery. The performance of currently available predictive models for these complications remains wanting, while machine learning has shown promise to improve on traditional modeling approaches. The purpose of this study was to compare the ability of two machine learning strategies, artificial neural networks (ANNs), and gradient boosting machines (XGBs) to conventional models using logistic regression (LR) in predicting leak and VTE after bariatric surgery. Methods ANN, XGB, and LR prediction models for leak and VTE among adults undergoing initial elective weight loss surgery were trained and validated using preoperative data from 2015 to 2017 from Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program database. Data were randomly split into training, validation, and testing populations. Model performance was measured by the area under the receiver operating characteristic curve (AUC) on the testing data for each model. Results The study cohort contained 436,807 patients. The incidences of leak and VTE were 0.70% and 0.46%. ANN (AUC 0.75, 95% CI 0.73-0.78) was the best-performing model for predicting leak, followed by XGB (AUC 0.70, 95% CI 0.68-0.72) and then LR (AUC 0.63, 95% CI 0.61-0.65, p < 0.001 for all comparisons). In detecting VTE, ANN, and XGB, LR achieved similar AUCs of 0.65 (95% CI 0.63-0.68), 0.67 (95% CI 0.64-0.70), and 0.64 (95% CI 0.61-0.66), respectively; the performance difference between XGB and LR was statistically significant (p = 0.001). Conclusions ANN and XGB outperformed traditional LR in predicting leak. These results suggest that ML has the potential to improve risk stratification for bariatric surgery, especially as techniques to extract more granular data from medical records improve. Further studies investigating the merits of machine learning to improve patient selection and risk management in bariatric surgery are warranted. Show less
Souwer, E.T.D.; Bastiaannet, E.; Bruijn, S. de; Breugom, A.J.; Bos, F. van den; Portielje, J.E.A.; Dekker, J.W.T. 2018
This thesis focuses on quality assurance of rectal cancer treatment, in particular of the surgical treatment. Both oncological short-term and long-term outcome parameters are studied, but also... Show moreThis thesis focuses on quality assurance of rectal cancer treatment, in particular of the surgical treatment. Both oncological short-term and long-term outcome parameters are studied, but also other end-points which are important for quality assurance are investigated, such as anastomotic leakage and stoma reversal. The introduction of total mesorectal excision (TME) surgery resulted in an improved survival of patients with rectal cancer. However, survival of the elderly patients and patients treated with an abdominoperineal resection improved less. For frail elderly patients, postoperative mortality is an important competitive risk factor and other treatment schedules might be more appropriate. The abdominoperineal resection itself was associated with a nonradical resection, decreased local control and decreased survival compared to patients treated with a low anterior resection. To improve these results, in selected cases preoperative treatment should consist of chemoradiotherapy and/or a widened resection. Anastomotic leakage is a feared complication after colorectal surgery. After surviving this complication, the overall survival rate in the long-term is still reduced. However, oncological outcome was not significantly affected. The presence of a stoma resulted in a lower symptomatic leakage rate. 20% of stomas was never reversed. Standardised postoperative surveillance resulted in an earlier confirmation of the diagnosis anastomotic leakage. Show less
