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  • 1
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2018
    In:  Surgical Endoscopy Vol. 32, No. 12 ( 2018-12), p. 4966-4972
    In: Surgical Endoscopy, Springer Science and Business Media LLC, Vol. 32, No. 12 ( 2018-12), p. 4966-4972
    Type of Medium: Online Resource
    ISSN: 0930-2794 , 1432-2218
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 639039-0
    detail.hit.zdb_id: 1463171-4
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  • 2
    Online Resource
    Online Resource
    Georg Thieme Verlag KG ; 2019
    In:  Zentralblatt für Chirurgie - Zeitschrift für Allgemeine, Viszeral-, Thorax- und Gefäßchirurgie Vol. 144, No. 05 ( 2019-10), p. 445-448
    In: Zentralblatt für Chirurgie - Zeitschrift für Allgemeine, Viszeral-, Thorax- und Gefäßchirurgie, Georg Thieme Verlag KG, Vol. 144, No. 05 ( 2019-10), p. 445-448
    Abstract: Zielsetzung Viszeralarterienaneurysmata stellen seltene, jedoch gefürchtete Gefäßpathologien dar. Am häufigsten sind die Äste des Truncus coeliacus und in diesem Zusammenhang die A. lienalis betroffen. Meist werden Viszeralaneurysmata erst diagnostiziert, wenn eine Blutungskomplikation durch die Aneurysmaruptur auftritt. Folglich wird bei einer vorherigen Detektion eine frühzeitige Ausschaltung nach Diagnosestellung empfohlen. Als primäres Verfahren bietet sich hierbei die endovaskuläre Ausschaltung an. Falls eine endovaskuläre Ausschaltung nicht möglich ist, kann auch durch eine chirurgische Ausschaltung das Viszeralaneurysma erfolgreich therapiert werden. Indikation Nachgewiesenes Milzarterienaneurysma im Hilusbereich. Ein endovaskuläres Coiling hätte voraussichtlich eine Ischämie der Milz bedingt. Methode Laparoskopische Ausschaltung des Milzarterienaneurysmas. Schlussfolgerung Bei für endovaskuläre Therapie nicht geeigneten Pathologien der A. lienalis stellt die laparoskopische Ausschaltung eine sicher und effektiv durchführbare minimalinvasive Option dar.
    Type of Medium: Online Resource
    ISSN: 0044-409X , 1438-9592
    Language: German
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2019
    detail.hit.zdb_id: 200935-3
    detail.hit.zdb_id: 2041776-7
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  • 3
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2022
    In:  Biomedical Engineering / Biomedizinische Technik Vol. 67, No. 1 ( 2022-02-23), p. 11-17
    In: Biomedical Engineering / Biomedizinische Technik, Walter de Gruyter GmbH, Vol. 67, No. 1 ( 2022-02-23), p. 11-17
    Abstract: Surgeons lose most of their tactile tissue information during minimal invasive surgery and need an additional tool of intraoperative tissue recognition. Confocal laser microscopy (CLM) is a well-established method of tissue investigation. The objective of this study was to analyze the feasibility and diagnostic accuracy of CLM nervous tissue recognition. Images taken with an endoscopic CLM system of sympathetic ganglions, nerve fibers and pleural tissue were characterized in terms of specific signal-patterns ex-vivo. No fluorescent dye was used. Diagnostic accuracy of tissue classification was evaluated by newly trained observers (sensitivity, specificity, PPV, NPV and interobserver variability). Although CLM images showed low CLM image contrast, assessment of nerve tissue was feasible without any fluorescent dye. Sensitivity and specificity ranged between 0.73 and 0.9 and 0.55–1.0, respectively. PPVs were 0.71–1.0 and the NPV range was between 0.58 and 0.86. The overall interobserver variability was 0.36. The eCLM enables to evaluate nervous tissue and to distinguish between nerve fibers, ganglions and pleural tissue based on backscattered light. However, the low image contrast and the heterogeneity in correct tissue diagnosis and a fair interobserver variability indicate the limit of CLM imaging without any fluorescent dye.
    Type of Medium: Online Resource
    ISSN: 0013-5585 , 1862-278X
    RVK:
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
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    detail.hit.zdb_id: 2234381-7
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  • 4
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2022
    In:  Journal of Medical Systems Vol. 46, No. 12 ( 2022-11-04)
    In: Journal of Medical Systems, Springer Science and Business Media LLC, Vol. 46, No. 12 ( 2022-11-04)
    Abstract: In the context of the COVID-19 pandemic, wearable sensors are important for early detection of critical illness especially in COVID-19 outpatients. We sought to determine in this pilot study whether a wearable in-ear sensor for continuous body temperature and heart rate monitoring (Cosinuss company, Munich) is sufficiently accurate for body temperature and heart rate monitoring. Comparing with several anesthesiologic standard of care monitoring devices (urinary bladder and zero-heat flux thermometer and ECG), we evaluated the in-ear sensor during non-cardiac surgery (German Clinical Trials Register Reg.-No: DRKS00012848). Limits of Agreement (LoA) based on Bland–Altman analysis were used to study the agreement between the in-ear sensor and the reference methods. The estimated LoA of the Cosinuss One and bladder temperature monitoring were [-0.79, 0.49] °C (95% confidence intervals [-1.03, -0.65] (lower LoA) and [0.35, 0.73] (upper LoA)), and [-0.78, 0.34] °C (95% confidence intervals [-1.18, -0.59] (lower LoA) and [0.16, 0.74] (upper LoA)) of the Cosinuss One and zero-heat flux temperature monitoring. 89% and 79% of Cosinuss One temperature monitoring were within ± 0.5 °C limit of bladder and zero-heat flux monitoring, respectively. The estimated LoA of Cosinuss One and ECG heart rate monitoring were [-4.81, 4.27] BPM (95% confidence intervals [-5.09, -4.56] (lower LoA) and [4.01, 4.54] (upper LoA)). The proportion of detection differences within ± 2BPM was 84%. Body temperature and heart rate were reliably measured by the wearable in-ear sensor.
    Type of Medium: Online Resource
    ISSN: 1573-689X
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2017001-4
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  • 5
    Online Resource
    Online Resource
    Georg Thieme Verlag KG ; 2020
    In:  Zentralblatt für Chirurgie - Zeitschrift für Allgemeine, Viszeral-, Thorax- und Gefäßchirurgie Vol. 145, No. 01 ( 2020-02), p. 57-63
    In: Zentralblatt für Chirurgie - Zeitschrift für Allgemeine, Viszeral-, Thorax- und Gefäßchirurgie, Georg Thieme Verlag KG, Vol. 145, No. 01 ( 2020-02), p. 57-63
    Abstract: Die postoperative Delayed Graft Function (DGF) nach Nierentransplantationen ist definiert als eine Einschränkung der Nierenfunktion nach Nierentransplantation und ist Risikofaktor für ein Transplantatversagen und verkürztes Transplantatüberleben. Ziel dieser Studie war es, die quantitative Perfusion von Nierentransplantaten während der Nierentransplantation zu erfassen und zu untersuchen, ob die gemessene Perfusion Rückschlüsse auf das postoperative Auftreten einer DGF erlaubt. In einem Zeitraum von 1 Jahr wurde bei den Patienten, bei denen ein Einverständnis für die ICG-Perfusionsmessung vorlag, die intraoperative quantitative ICG-Perfusionsmessung mithilfe der Kamera IC-View der Firma Pulsion® durchgeführt. Es erfolgte die Gruppeneinteilung nach postmortaler Spende und Lebendspenden und nach Auftreten bzw. Ausbleiben einer DGF. Intraoperativ erfolgte die Festlegung eines Areals mit starker und geringer ICG-Perfusion. Es wurden die maximale Perfusion, die Anflutzeit der Fluoreszenz und der absolute Anstieg der Fluoreszenz in diesen Arealen dokumentiert. Zusätzlich erfolgte die Berechnung der maximalen Perfusion im Verhältnis zu einem Standardareal. Postoperativ erfolgte die Auswertung durch die Software IC-Calc der Firma Pulsion. Insgesamt konnten 36 Patienten in die Studie eingeschlossen werden. Komplikationen durch die ICG-Applikation traten nicht auf. Bei 10 Patienten, die eine postmortale Nierentransplantatspende erhielten, wurde eine DGF festgestellt (DGF-Gruppe). In der Gruppe der Lebendspende trat eine DGF nicht auf. In den Arealen mit starker ICG-Fluoreszenz fand sich ein signifikanter Unterschied in der maximalen Fluoreszenz zwischen der DGF-Gruppe und Nierenlebendspenden. Die schwach perfundierten Areale wiesen signifikante Unterschiede zwischen der maximalen Perfusion, dem absoluten Anstieg der Perfusion sowie zur Ratio zum Standardareal zwischen DGF und Lebendspenden auf. Ein Unterschied zwischen postmortalen Nierentransplantatspenden ohne DGF und DGF-Gruppe konnte nicht nachgewiesen werden. In dieser Studie zeigte sich, dass sich die quantitative Perfusionsbestimmung von Nierentransplantaten intraoperativ sicher durchführen lässt. Die aktuelle Datenlage deutet eine mögliche zuverlässige Vorhersage der DGF an.
    Type of Medium: Online Resource
    ISSN: 0044-409X , 1438-9592
    Language: German
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2020
    detail.hit.zdb_id: 200935-3
    detail.hit.zdb_id: 2041776-7
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  • 6
    Online Resource
    Online Resource
    S. Karger AG ; 2020
    In:  Visceral Medicine Vol. 36, No. 2 ( 2020), p. 70-79
    In: Visceral Medicine, S. Karger AG, Vol. 36, No. 2 ( 2020), p. 70-79
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 Cancer will replace cardiovascular diseases as the most frequent cause of death. Therefore, the goals of cancer treatment are prevention strategies and early detection by cancer screening and ideal stage therapy. From an oncological point of view, complete tumor resection is a significant prognostic factor. Optical coherence tomography (OCT) and confocal laser microscopy (CLM) are two techniques that have the potential to complement intraoperative frozen section analysis as in vivo and real-time optical biopsies. 〈 b 〉 〈 i 〉 Summary: 〈 /i 〉 〈 /b 〉 In this review we present both procedures and review the progress of evaluation for intraoperative application in visceral surgery. For visceral surgery, there are promising studies evaluating OCT and CLM; however, application during routine visceral surgical interventions is still lacking. 〈 b 〉 〈 i 〉 Key Message: 〈 /i 〉 〈 /b 〉 OCT and CLM are not competing but complementary approaches of tissue analysis to intraoperative frozen section analysis. Although intraoperative application of OCT and CLM is at an early stage, they are two promising techniques of intraoperative in vivo and real-time tissue examination. Additionally, deep learning strategies provide a significant supplement for automated tissue detection.
    Type of Medium: Online Resource
    ISSN: 2297-4725 , 2297-475X
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2020
    detail.hit.zdb_id: 2850733-2
    detail.hit.zdb_id: 2850734-4
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  • 7
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2019
    In:  Surgical Endoscopy Vol. 33, No. 6 ( 2019-6), p. 1811-1817
    In: Surgical Endoscopy, Springer Science and Business Media LLC, Vol. 33, No. 6 ( 2019-6), p. 1811-1817
    Type of Medium: Online Resource
    ISSN: 0930-2794 , 1432-2218
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 639039-0
    detail.hit.zdb_id: 1463171-4
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  • 8
    Online Resource
    Online Resource
    Walter de Gruyter GmbH ; 2021
    In:  Biomedical Engineering / Biomedizinische Technik Vol. 66, No. 3 ( 2021-06-25), p. 285-292
    In: Biomedical Engineering / Biomedizinische Technik, Walter de Gruyter GmbH, Vol. 66, No. 3 ( 2021-06-25), p. 285-292
    Abstract: Cancer will be the leading cause of death in a few decades. In line with minimal invasive lung cancer surgery, surgeons loose most of their tactile tissue information and need an additional tool of intraoperative tissue navigation during surgery. Confocal laser microscopy is a well-established method of tissue investigation. In this ex-vivo pilot study, we evaluated an endoscopic confocal laser microscope (eCLM) that does not need any fluorescent dye as a diagnostic tool in non-malignant and malignant pulmonary tissue and distal stapler resection margins, respectively. In seven cases, an eCLM was used for examining pulmonary tissue ex-vivo . Images of non-malignant and non-small cell lung cancer tissue and distal stapler resection margins were characterized in terms of specific signal-patterns. No fluorescent dye was used. Correlations to findings in conventional histology were systematically recorded and described. Healthy lung tissue showed hyperreflectoric alveolar walls with dark alveolar spaces. Hyperreflective nets indicated the tumor stroma; whereas the hyperreflective areas indicated the tumor cell clusters. Compared to adenocarcinoma tissue, tissue from squamous cell carcinoma showed more distinctive hyperreflective stroma nets. eCLM characteristics seen in non-malignant and malignant tissue were also visible in distal stapler resection margins and so therefore it was feasible to distinguish between healthy lung tissue and lung cancer. This pilot study shows that the assessment of pulmonary tissue with this eCLM for minimally invasive surgical approach without any fluorescent dye is feasible. It enables to differentiate between benign and malignant tissue in pulmonary specimen by easy to evaluate and reproducible parameters.
    Type of Medium: Online Resource
    ISSN: 1862-278X , 0013-5585
    RVK:
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 120817-2
    detail.hit.zdb_id: 2234381-7
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  • 9
    In: Visceral Medicine, S. Karger AG, Vol. 37, No. 6 ( 2021), p. 533-541
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 Confocal laser microscopy (CLM) is one of the optical techniques that are promising methods of intraoperative in vivo real-time tissue examination based on tissue fluorescence. However, surgeons might struggle interpreting CLM images intraoperatively due to different tissue characteristics of different tissue pathologies in clinical reality. Deep learning techniques enable fast and consistent image analysis and might support intraoperative image interpretation. The objective of this study was to analyze the diagnostic accuracy of newly trained observers in the evaluation of normal colon and peritoneal tissue and colon cancer and metastasis, respectively, and to compare it with that of convolutional neural networks (CNNs). 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 Two hundred representative CLM images of the normal and malignant colon and peritoneal tissue were evaluated by newly trained observers (surgeons and pathologists) and CNNs (VGG-16 and Densenet121), respectively, based on tissue dignity. The primary endpoint was the correct detection of the normal and cancer/metastasis tissue measured by sensitivity and specificity of both groups. Additionally, positive predictive values (PPVs) and negative predictive values (NPVs) were calculated for the newly trained observer group. The interobserver variability of dignity evaluation was calculated using kappa statistic. The F1-score and area under the curve (AUC) were used to evaluate the performance of image recognition of the CNNs’ training scenarios. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 Sensitivity and specificity ranged between 0.55 and 1.0 (pathologists: 0.66–0.97; surgeons: 0.55–1.0) and between 0.65 and 0.96 (pathologists: 0.68–0.93; surgeons: 0.65–0.96), respectively. PPVs were 0.75 and 0.90 in the pathologists’ group and 0.73–0.96 in the surgeons’ group, respectively. NPVs were 0.73 and 0.96 for pathologists’ and between 0.66 and 1.00 for surgeons’ tissue analysis. The overall interobserver variability was 0.54. Depending on the training scenario, cancer/metastasis tissue was classified with an AUC of 0.77–0.88 by VGG-16 and 0.85–0.89 by Densenet121. Transfer learning improved performance over training from scratch. 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 Newly trained investigators are able to learn CLM images features and interpretation rapidly, regardless of their clinical experience. Heterogeneity in tissue diagnosis and a moderate interobserver variability reflect the clinical reality more realistic. CNNs provide comparable diagnostic results as clinical observers and could improve surgeons’ intraoperative tissue assessment.
    Type of Medium: Online Resource
    ISSN: 2297-4725 , 2297-475X
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2021
    detail.hit.zdb_id: 2850733-2
    detail.hit.zdb_id: 2850734-4
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