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  1. Article ; Online: Has the time come for implementing neoadjuvant chemotherapy for clinical locally advanced colon cancer?

    Bertelsen, Claus Anders / Kleif, Jakob

    Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland

    2023  Volume 25, Issue 7, Page(s) 1540–1541

    MeSH term(s) Humans ; Neoadjuvant Therapy ; Colonic Neoplasms/drug therapy ; Colonic Neoplasms/surgery ; Chemotherapy, Adjuvant ; Antineoplastic Combined Chemotherapy Protocols/therapeutic use
    Language English
    Publishing date 2023-05-10
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 1440017-0
    ISSN 1463-1318 ; 1462-8910
    ISSN (online) 1463-1318
    ISSN 1462-8910
    DOI 10.1111/codi.16600
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Author Reply.

    Bertelsen, Claus Anders / Kleif, Jakob

    Diseases of the colon and rectum

    2022  Volume 66, Issue 3, Page(s) e130

    Language English
    Publishing date 2022-12-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 212581-x
    ISSN 1530-0358 ; 0012-3706
    ISSN (online) 1530-0358
    ISSN 0012-3706
    DOI 10.1097/DCR.0000000000002695
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Cutaneous sensory block area of the ultrasound-guided subcostal transversus abdominis plane block: an observational study.

    Salmonsen, Christopher Blom / Lange, Kai Henrik Wiborg / Rothe, Christian / Kleif, Jakob / Bertelsen, Claus Anders

    Regional anesthesia and pain medicine

    2024  Volume 49, Issue 4, Page(s) 289–292

    Abstract: Background and objectives: The transversus abdominis plane block (TAP) can be applied using different approaches, resulting in varying cutaneous analgesic distributions. This study aimed to assess the cutaneous sensory block area (CSBA) after ultrasound- ...

    Abstract Background and objectives: The transversus abdominis plane block (TAP) can be applied using different approaches, resulting in varying cutaneous analgesic distributions. This study aimed to assess the cutaneous sensory block area (CSBA) after ultrasound-guided TAP (US-TAP) using the subcostal approach.
    Methods: Thirty patients undergoing elective laparoscopic cholecystectomy received a subcostal US-TAP with 20 mL 2.5 mg/mL ropivacaine bilaterally. Measurements were performed 150 min after block application. The CSBA was mapped using cold sensation and a sterile marker, photodocumented, and transferred to a transparency. The area of the CSBA was calculated from the transparencies.
    Results: The median CSBA of the subcostal US-TAP was 174 cm
    Conclusion: The subcostal US-TAP results in a heterogeneous non-dermatomal CSBA with varying size and distribution across the medial abdominal wall.
    MeSH term(s) Humans ; Anesthetics, Local ; Pain, Postoperative ; Ropivacaine ; Ultrasonography, Interventional/methods ; Abdominal Muscles/diagnostic imaging
    Chemical Substances Anesthetics, Local ; Ropivacaine (7IO5LYA57N)
    Language English
    Publishing date 2024-04-02
    Publishing country England
    Document type Observational Study ; Journal Article
    ZDB-ID 1425299-5
    ISSN 1532-8651 ; 1098-7339 ; 0146-521X
    ISSN (online) 1532-8651
    ISSN 1098-7339 ; 0146-521X
    DOI 10.1136/rapm-2023-104753
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Complete mesocolic excision an assessment of feasibility and outcome.

    Bertelsen, Claus Anders

    Danish medical journal

    2017  Volume 64, Issue 2

    Abstract: Surgery is the most important factor for radical treatment of colon cancer, and the long-term prognosis can be improved by improving the surgical treatment without increased risk of perioperative mortality. Complete mesocolic excision (CME), in which ... ...

    Abstract Surgery is the most important factor for radical treatment of colon cancer, and the long-term prognosis can be improved by improving the surgical treatment without increased risk of perioperative mortality. Complete mesocolic excision (CME), in which more extensive lymph node (LN) dissection is performed, has been shown in single-centre studies with historical controls to be associated with better oncological outcome. However, better evidence is needed. The main purpose of this PhD thesis was to investigate whether CME could be implemented in a colorectal surgical department in Denmark, whether more extensive dissection could demonstrate LN metastases outside the mesocolon, and to demonstrate a possible association between CME and improved oncological results without increased risk of perioperative mortality. This thesis includes five articles. Two articles (IV and V) are based on the population of patients undergoing elective resection for colon cancer in the Capital Region from June 2008 to December 2013. Two articles (II and III) are based on data from the local colon database in Hillerød, and the last article (I) is a systematic review concerning the risk of metastases from colon cancer to the central LNs in the mesocolon. Article I found a risk of metastases in central LNs to be reported in 1-22% of the cases of right-sided colon cancers, and in up to 12% of the cases with sigmoid tumours. The populations included and methods used in the studies were very heterogeneous and no definitive conclusions can be drawn. It was shown in article II that the surgical quality, i.e. quality of the specimens assessed by the pathologists, improved with implementation of CME in Hillerød. The vascular tie was higher, and the implementation was not associated with an increased risk of perioperative mortality. Article III demonstrated a risk of LN metastases in the gastrocolic ligament along the stomach for tumours located in the transverse colon, in the ascending or descending colon close to or in the flexures. It occurred in 4% of all patients and 13% of the patients with LN metastases in mesocolon. Resection of these LNs seems advisable for these tumour locations. Article IV showed no association between increased perioperative mortality and CME (n = 529) when compared with non-CME (n = 1,701). The 30-day mortality was 4.2% after CME compared with 3.7% after non-CME (p = 0.605), and the 90-day mortalities were 6.2% and 4.9% (p = 0.219) respectively. Odds ratios for 30-day and 90-day mortalities after CME were respectively 1.07 (95% confidence interval: 0.62-1.80) and 1.25 (0.77-1.94) in the multi-variable logistic regression analyses. Postoperative respiratory failure and need for vasopressors were significantly more frequent in the CME group and, besides CME itself, could be associated with the fewer laparoscopic resections and more severe preoperative comorbidity in the CME Group. Article V demonstrated an association between higher four-year disease-free survival for stage I-III tumours and CME (n = 364) when compared with non-CME (n = 1,031). Most notable was the difference for stage I and II cancers. The four-year disease-free survival for stage I was 100% in the CME group compared with 89.8% (83.1-96.6) in the non-CME group (p = 0.046). For stage II the disease-free survivals were 91.9% (87.2-96.6%) in the CME group and 77.9% (71.6-84.1%) in the non-CME group (p = 0.0033), and for stage III 73.5% (63.6-83.5) and 67.5% (61.8-73.2) (p = 0.13) respectively. In the multivariable Cox regression models, CME was a significant predictive factor for higher dis-ease-free four-year survival for stage I-III patients with hazard ratios (HR) for CME of 0.59 (0.42-0.83, p = 0.0025). For stage II the HR was 0.44 (0.23-0.86, p = 0.018) and for stage III 0.64 (0.42-1.00, p = 0.048).
    MeSH term(s) Adenocarcinoma/surgery ; Colon/anatomy & histology ; Colonic Neoplasms/pathology ; Colonic Neoplasms/surgery ; Digestive System Surgical Procedures/methods ; Disease-Free Survival ; Feasibility Studies ; Humans ; Lymph Node Excision ; Lymphatic Metastasis ; Mesocolon/embryology ; Mesocolon/surgery ; Survival Rate ; Treatment Outcome
    Language English
    Publishing date 2017-02
    Publishing country Denmark
    Document type Journal Article ; Review
    ZDB-ID 2648771-8
    ISSN 2245-1919 ; 2245-1919
    ISSN (online) 2245-1919
    ISSN 2245-1919
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  5. Article ; Online: The Author Replies.

    Bertelsen, Claus Anders

    Diseases of the colon and rectum

    2017  Volume 60, Issue 5, Page(s) e33–e34

    Language English
    Publishing date 2017
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 212581-x
    ISSN 1530-0358 ; 0012-3706
    ISSN (online) 1530-0358
    ISSN 0012-3706
    DOI 10.1097/DCR.0000000000000803
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Complete mesocolic excision is not just dissection in the mesocolic plane.

    Sakjah, Sara / Kleif, Jakob / Bertelsen, Claus Anders

    Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland

    2022  Volume 24, Issue 11, Page(s) 1436

    MeSH term(s) Humans ; Mesocolon/surgery ; Colectomy ; Dissection ; Colonic Neoplasms/surgery ; Lymph Node Excision ; Laparoscopy
    Language English
    Publishing date 2022-06-14
    Publishing country England
    Document type Letter
    ZDB-ID 1440017-0
    ISSN 1463-1318 ; 1462-8910
    ISSN (online) 1463-1318
    ISSN 1462-8910
    DOI 10.1111/codi.16198
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Behandling af pilonidalsinus som regionsfunktion--nej tak.

    Bertelsen, Claus Anders

    Ugeskrift for laeger

    2015  Volume 177, Issue 20, Page(s) 996

    Language Danish
    Publishing date 2015-05-11
    Publishing country Denmark
    Document type Comment ; Letter
    ZDB-ID 124102-3
    ISSN 1603-6824 ; 0041-5782
    ISSN (online) 1603-6824
    ISSN 0041-5782
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Association between plane of mesocolic dissection and recurrence after complete mesocolic excision for right-sided colon cancer: a cohort study.

    Bertelsen, Claus Anders / Gundestrup, Anders Kierkegaard / Olsen, Anna Sofie Friis / Bols, Birgitte / Ingeholm, Peter / Kleif, Jakob

    Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland

    2023  Volume 25, Issue 7, Page(s) 1392–1402

    Abstract: Aim: Dissection in the mesocolic plane is considered by some medical professionals to be crucial in complete mesocolic excision. We aimed to assess whether intramesocolic plane dissection is associated with a risk of recurrence after complete mesocolic ... ...

    Abstract Aim: Dissection in the mesocolic plane is considered by some medical professionals to be crucial in complete mesocolic excision. We aimed to assess whether intramesocolic plane dissection is associated with a risk of recurrence after complete mesocolic excision for right-sided colon cancer.
    Method: This is a single-centre study based on prospectively registered data on patients undergoing resection for Union for International Cancer Control Stage I-III right-sided colon adenocarcinoma during the period 2010-2017. Patients were stratified in an intramesocolic plane group or a mesocolic plane group based on a prospective assessment of fresh specimens by a pathologist. Primary outcome was the 4.2 year risk of recurrence after inverse probability treatment weighting and competing risk analyses.
    Results: Of 383 patients, 4 (1%) were excluded as the specimen was assessed as muscularis propria plane, 347 (91.6%) specimens were deemed as mesocolic and 32 (8.4%) as intramesocolic. The 4.2 year cumulative incidence of recurrence after inverse probability treatment weighting was 9.1% (95% CI 6.0%-12.1%) in the mesocolic group compared with 14.0% (3.6%-24.5%) in the intramesocolic group with an absolute risk difference in favour of mesocolic plane dissection of 4.9% (-5.7 to 15.6, p = 0.37). No difference was observed in the risk of local recurrence, death before recurrence or overall survival after 4.2 years between the two groups.
    Conclusion: Mesocolic plane dissection can be achieved in more than 90% of patients. The classification seems to be a guide for good surgical practice and not to be used for research purposes.
    MeSH term(s) Humans ; Adenocarcinoma/pathology ; Cohort Studies ; Prospective Studies ; Colonic Neoplasms/pathology ; Colectomy/adverse effects ; Mesocolon/surgery ; Mesocolon/pathology ; Lymph Node Excision ; Laparoscopy ; Treatment Outcome
    Language English
    Publishing date 2023-04-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1440017-0
    ISSN 1463-1318 ; 1462-8910
    ISSN (online) 1463-1318
    ISSN 1462-8910
    DOI 10.1111/codi.16551
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Developing a phantom for simulating robotic-assisted complete mesocolic excision using 3D printing and medical imaging.

    Hertz, Peter / Bertelsen, Claus Anders / Houlind, Kim / Bundgaard, Lars / Konge, Lars / Bjerrum, Flemming / Svendsen, Morten Bo Søndergaard

    BMC surgery

    2024  Volume 24, Issue 1, Page(s) 72

    Abstract: Background: Robotic-assisted complete mesocolic excision is an advanced procedure mainly because of the great variability in anatomy. Phantoms can be used for simulation-based training and assessment of competency when learning new surgical procedures. ... ...

    Abstract Background: Robotic-assisted complete mesocolic excision is an advanced procedure mainly because of the great variability in anatomy. Phantoms can be used for simulation-based training and assessment of competency when learning new surgical procedures. However, no phantoms for robotic complete mesocolic excision have previously been described. This study aimed to develop an anatomically true-to-life phantom, which can be used for training with a robotic system situated in the clinical setting and can be used for the assessment of surgical competency.
    Methods: Established pathology and surgical assessment tools for complete mesocolic excision and specimens were used for the phantom development. Each assessment item was translated into an engineering development task and evaluated for relevance. Anatomical realism was obtained by extracting relevant organs from preoperative patient scans and 3D printing casting moulds for each organ. Each element of the phantom was evaluated by two experienced complete mesocolic excision surgeons without influencing each other's answers and their feedback was used in an iterative process of prototype development and testing.
    Results: It was possible to integrate 35 out of 48 procedure-specific items from the surgical assessment tool and all elements from the pathological evaluation tool. By adding fluorophores to the mesocolic tissue, we developed an easy way to assess the integrity of the mesocolon using ultraviolet light. The phantom was built using silicone, is easy to store, and can be used in robotic systems designated for patient procedures as it does not contain animal-derived parts.
    Conclusions: The newly developed phantom could be used for training and competency assessment for robotic-assisted complete mesocolic excision surgery in a simulated setting.
    MeSH term(s) Humans ; Mesocolon/diagnostic imaging ; Mesocolon/surgery ; Robotic Surgical Procedures/methods ; Colonic Neoplasms/surgery ; Colectomy/methods ; Lymph Node Excision/methods ; Diagnostic Imaging ; Printing, Three-Dimensional ; Laparoscopy/methods
    Language English
    Publishing date 2024-02-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 2050442-1
    ISSN 1471-2482 ; 1471-2482
    ISSN (online) 1471-2482
    ISSN 1471-2482
    DOI 10.1186/s12893-024-02353-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Risk of Local Recurrence After Complete Mesocolic Excision for Right-Sided Colon Cancer: Post-Hoc Sensitivity Analysis of a Population-Based Study.

    Bertelsen, Claus Anders / Neuenschwander, Anders Ulrich / Kleif, Jakob

    Diseases of the colon and rectum

    2021  Volume 65, Issue 9, Page(s) 1103–1111

    Abstract: Background: A causal treatment effect of complete mesocolic excision for right-sided colon cancer on the risk of recurrence has been shown, but it is still unclear whether this is caused solely by a risk reduction of local recurrence.: Objective: The ...

    Abstract Background: A causal treatment effect of complete mesocolic excision for right-sided colon cancer on the risk of recurrence has been shown, but it is still unclear whether this is caused solely by a risk reduction of local recurrence.
    Objective: The goal of this study was to assess to what extent complete mesocolic excision contributes to the risk of local recurrence.
    Design: This study was a posthoc analyses of data from a population-based cohort. Inverse probability of treatment weighting and competing risk analyses were used to estimate the possible causal effects of complete mesocolic excision.
    Setting: Data were collected from the 4 public colorectal cancer centers in the Capital Region of Denmark.
    Patients: Patients undergoing elective colon resections for right-sided colon cancer without distant metastases during the period 2010-2013 were included. One center performed complete mesocolic excision and the remaining 3 centers performed conventional resections.
    Main outcome measures: The primary outcome was the cumulative incidence of solely local recurrence 5.2 years after surgery. Secondary outcomes were solely distant recurrence and both local and distant recurrence diagnosed within 180 days.
    Results: A total of 807 patients were included with 186 undergoing complete mesocolic excision and 621 conventional resections. The 5.2-year cumulative incidence of a solely local recurrence was 3.7% (95% CI, 0.5-6.1) after complete mesocolic excision compared with 7.0% (5.0-8.9) in the control group, and the absolute risk reduction of complete mesocolic excision was 3.7% (2.5-7.1; p = 0.035). The absolute risk reduction on local and distant recurrence was 3.4% (1.3-5.6; p = 0.002) and on solely distant recurrence was 3.1% (0.0-6.2; p = 0.052).
    Limitations: The recurrence risk after conventional resection might be underestimated by the use of inappropriate modalities to diagnose local recurrence for some patients and the shorter duration in this group.
    Conclusion: This study shows a causal treatment effect of complete mesocolic excision on the risk of a solely local recurrence and of distant recurrence with or without local recurrence. See Video Abstract at http://links.lww.com/DCR/B832 .RIESGO DE RECURRENCIA LOCAL DESPUÉS DE LA ESCISIÓN MESOCÓLICA COMPLETA PARA EL CÁNCER DE COLON DEL LADO DERECHO: ANÁLISIS DE SENSIBILIDAD POST-HOC DE UN ESTUDIO POBLACIONALANTECEDENTES:Se ha demostrado un efecto del tratamiento causal de la escisión mesocólica completa para el cáncer de colon del lado derecho sobre el riesgo de recurrencia, pero aún no está claro si esto se debe únicamente a una reducción del riesgo de recurrencia local.OBJETIVO:Evaluar en qué medida la escisión mesocólica completa se atribuye al riesgo de recurrencia local.DISEÑO:Análisis posthoc de datos de una cohorte poblacional. Se utilizaron análisis de probabilidad inversa de ponderación del tratamiento y de riesgo competitivo para estimar los posibles efectos causales de la escisión mesocólica completa.AJUSTE:Datos de los cuatro centros públicos de cáncer colorrectal en la Región Capital de Dinamarca.PACIENTES:Pacientes sometidos a resecciones de colon electivas por cáncer de colon derecho sin metástasis a distancia durante el período 2010-2013. Un centro realizó escisión mesocólica completa, el resto resecciones convencionales.PRINCIPALES MEDIDAS DE RESULTADO:El resultado primario fue la incidencia acumulada de la recidiva local únicamente, 5,2 años después de la cirugía. Los resultados secundarios fueron únicamente la recidiva a distancia y ambas,la recidiva local y a distancia diagnosticada dentro de los 180 días.RESULTADOS:Se incluyeron un total de 807 pacientes, 186 sometidos a escisión mesocólica completa y 621 resecciones convencionales. La incidencia acumulada de 5,2 años de una recidiva únicamente local fue del 3,7% (IC del 95%: 0,5 a 6,1) después de la escisión mesocólica completa en comparación con el 7,0% (5,0 a 8,9) en el grupo de control, y la reducción del riesgo absoluto de la escisión mesocólica completa fue del 3,7% (2,5-7,1; p = 0,035). La reducción del riesgo absoluto de recidiva local y distante fue del 3,4% (1,3-5,6; p = 0,0019) y de recidiva únicamente a distancia 3,1% (0,0-6,2; p = 0,052).LIMITANTES:El riesgo de recurrencia después de la resección convencional podría subestimarse por el uso de modalidades inapropiadas para el diagnostico de la recurrencia local en algunos pacientes y la duración más corta en este grupo.CONCLUSIÓN:Este estudio muestra un efecto del tratamiento causal de la escisión mesocólica completa sobre el riesgo de una recidiva únicamente local y de recidiva a distancia con o sin recidiva local. Consulte Video Resumen en http://links.lww.com/DCR/B832 . (Traducción-Dr. Mauricio Santamaria ).
    MeSH term(s) Cohort Studies ; Colectomy/methods ; Colonic Neoplasms/pathology ; Colonic Neoplasms/surgery ; Denmark/epidemiology ; Humans ; Mesocolon/pathology ; Mesocolon/surgery ; Neoplasm Recurrence, Local/epidemiology ; Risk Assessment
    Language English
    Publishing date 2021-11-24
    Publishing country United States
    Document type Journal Article ; Video-Audio Media ; Comment
    ZDB-ID 212581-x
    ISSN 1530-0358 ; 0012-3706
    ISSN (online) 1530-0358
    ISSN 0012-3706
    DOI 10.1097/DCR.0000000000002174
    Database MEDical Literature Analysis and Retrieval System OnLINE

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