Search results for: Lukas Prantl

Items from 1 to 20 out of 39 results

article

Comparison of venous couplers versus hand‐sewn technique in 4577 cases of DIEP‐flap breast reconstructions – A multicenter study

Paul Heidekrueger, Uwe von Fritschen, Nicholas Moellhoff, Gunter Germann, more

Introduction Venous anastomosis remains to be a challenging step in microsurgical tissue transfer and venous complications constitute to a common reason for free flap failure. While several studies have compared mechanical vs. hand‐sewn venous anastomoses, there is no large‐series study comparing the type of anastomosis exclusively in DIEP flap breast reconstructions. Patients and Methods Between...

article

SARS‐CoV‐2 infection and venous thromboembolism after surgery: an international prospective cohort study

COVIDSurg Collaborative, GlobalSurg Collaborative, Dmitri Nepogodiev, Joana FF Simoes, more

Anaesthesia > 77 > 1 > 28 - 39

SARS‐CoV‐2 has been associated with an increased rate of venous thromboembolism in critically ill patients. Since surgical patients are already at higher risk of venous thromboembolism than general populations, this study aimed to determine if patients with peri‐operative or prior SARS‐CoV‐2 were at further increased risk of venous thromboembolism. We conducted a planned sub‐study and analysis from...

article

Effects of pre‐operative isolation on postoperative pulmonary complications after elective surgery: an international prospective cohort study

COVIDSurg Collaborative, GlobalSurg Collaborative, Dmitri Nepogodiev, Joana FF Simoes, more

Anaesthesia > 76 > 11 > 1454 - 1464

We aimed to determine the impact of pre‐operative isolation on postoperative pulmonary complications after elective surgery during the global SARS‐CoV‐2 pandemic. We performed an international prospective cohort study including patients undergoing elective surgery in October 2020. Isolation was defined as the period before surgery during which patients did not leave their house or receive visitors...

article

Timing of surgery following SARS‐CoV‐2 infection: an international prospective cohort study

COVIDSurg Collaborative, GlobalSurg Collaborative, Dmitri Nepogodiev, Joana FF Simoes, more

Anaesthesia > 76 > 6 > 748 - 758

Peri‐operative SARS‐CoV‐2 infection increases postoperative mortality. The aim of this study was to determine the optimal duration of planned delay before surgery in patients who have had SARS‐CoV‐2 infection. This international, multicentre, prospective cohort study included patients undergoing elective or emergency surgery during October 2020. Surgical patients with pre‐operative SARS‐CoV‐2 infection...

article

Feasibility study of preoperative microvessel evaluation and characterization in perforator flaps using various modes of color‐coded duplex sonography (CCDS)

Andreas Kehrer, Daniel Lonic, Paul Heidekrueger, Talia Bosselmann, more

Microsurgery > 40 > 7 > 750 - 759

Background Color‐coded duplex sonography (CCDS) is useful for perforator flap design showing the highest sensitivity in identifying microvessels. This prospective study evaluates the feasibility of different ultrasound (US) modes applied by the microsurgeon in daily practice suggesting quantifiable reference values. Methods Twenty‐four patients aged between 17 and 68 years (mean 43.3 ± 14.2 years)...

article

Reconstruction of chronic scapholunate dissociation with the modified scapholunate axis method (SLAM)

Juergen H. Dolderer, Katja Zimny, Silvan M. Klein, Michael Koller, more

Archives of Orthopaedic and Trauma Surgery > 2019 > 139 > 11 > 1641-1647

Introduction Injury to the scapholunate (SL) ligament represents a common trauma of the wrist but is frequently misdiagnosed because of non-specific pain. Established methods for SL reconstruction mainly focus on reducing pain and maintaining the reposition result at the expense of mobility and strength. This study aimed at restoring stability and reducing pain while simultaneously maintaining mobility...

article

Imaging of pH and pO₂ gives insight in molecular processes of irradiated cells

Yvonne Reinders, Robert J. Meier, Gregor Liebsch, Fabian Pohl, more

Experimental Dermatology > 28 > 5 > 628 - 630

One of the major challenges in radiation therapy is the interference with tissue repair processes due to hypoxic characteristics and pH dysregulation. In this study, we present dual imaging of pH and oxygenation in vitro based on luminescent biocompatible sensor foils that allow studying the effects of irradiation on different cell types in culture. Different sensitivities of fibroblast and oral squamous...

article

Anatomical study of the zygomatic and buccal branches of the facial nerve: Application to facial reanimation procedures

Andreas Kehrer, Simon Engelmann, Marc Ruewe, Sebastian Geis, more

Clinical Anatomy > 32 > 4 > 480 - 488

The facial nerve is responsible for any facial expression channeling human emotions. Facial paralysis causes asymmetry, lagophthalmus, oral incontinence, and social limitations. Facial dynamics may be re‐established with cross‐face‐nerve‐grafts (CFNG). Our aim was to reappraise the zygomaticobuccal branch system relevant for facial reanimation surgery with respect to anastomoses and crossings. Dissection...

article

Fotodokumentation ästhetischer Behandlungen

Dirk Brandl, Lukas Prantl

Journal für Ästhetische Chirurgie > 2019 > 12 > 2 > 84-94

Die Fotodokumentation bekommt eine größer werdende Bedeutung. Diese Entwicklung ist nicht zuletzt darauf zurückzuführen, dass in der ästhetischen Medizin zunehmend Verfahren angeboten werden, die immer weniger invasiv sind, mehrere Sitzungen bis zum endgültigen Ergebnis benötigen und deren Behandlungsintervalle bis zu 2 Monate auseinanderliegen. Ein Patient, der sich jeden Tag im Spiegel sieht, kann...

article

The ideal ear position in Caucasian females

P. Niclas Broer, Aung Thiha, Denis Ehrl, Sammy Sinno, more

Journal of Cranio-Maxillofacial Surgery > 2018 > 46 > 3 > 485-491

Ear position contributes significantly to facial appearance. However, while objective measurements remain the foundation for esthetic evaluations, little is known about how an ear should ideally be positioned regarding its rotational axis. This study aimed to further evaluate whether there exists a universally applicable ideal ear axis, and how sociodemographic factors impact such preferences.An interactive...

article

The spreaded gracilis flap revisited: Comparing outcomes in lower limb reconstruction

Paul Immanuel Heidekrueger, Denis Ehrl, Milomir Ninkovic, Aung Thiha, more

Microsurgery > 37 > 8 > 873 - 880

Background In lower limb reconstruction, the free gracilis muscle flap is usually chosen for coverage of small‐ to medium‐sized defects. Aim of this study was a re‐appraisal regarding the reconstructive indications of the gracilis muscle flap with a focus on postoperative complications in order to evaluate if it can also be routinely used to reconstruct large‐size lower limb defects. Methods A...

article

Modifikation der Zentrifugation zur Reduktion der Leukozytenzahl in Platelet-rich Plasma und die Auswirkung auf die Proliferation von autologen mesenchymalen Stammzellen

Siegmund Lang, Gero Brockhoff, Boyko Gueorguiev, Michaela Huber, more

Sports Orthopaedics and Traumatology > 2016 > 32 > 2 > 177-182

Ziel dieser Arbeit waren die Charakterisierung und Optimierung eines kommerziell verfügbaren PRP-Kits. Zusätzlich wurde der Einfluss von leukozytenarmen PRP auf die Proliferation von mesenchymalen Stammzellen aus Fettgewebe (ASCs) untersucht.Autologes konditioniertes Plasma (ACP) wurde mit drei verschiedenen Zentrifugationseinstellungen von 30 männlichen Probanden (Alter 21-50 Jahre) hergestellt und...

chapter

Serologic and Histologic Findings in Capsule Contracture Patients with Silicone Gel Implants

Lukas Prantl

Breast Augmentation > Miscellaneous > 649-654

Local and systemic reactions of the body to silicone gel implants are still under discussion and are the subject of intensive research to improve biocompatibility. The incidence of capsular contracture varies in the literature from less than 1% up to 74%. Histologically, fibrous capsules show a three-layer composition. The internal layer abutting the silicone surface appears to be single-layered or...

chapter

Differentiation and Plasticity of Stem Cells for Tissue Engineering

Yao-Hua Song, Lukas Prantl, Eckhard Alt

Tissue Engineering > Basics and Principles of Tissue Engineering > 113-130

Stem cells are defined as undifferentiated cells that have the capacity to self-renew and to differentiate into various mature cells at a single cell level [118]. Stem cells support normal embryogenesis and postnatal life. Stem cells serve to renew tissue throughout an individual’s postnatal life by replacing the cells that are lost owing to everyday wear and tear in our bodies. Bone marrow contains...

article

Long-term results after modified Epping procedure for trapeziometacarpal osteoarthritis

Silvan M. Klein, Katharina Wachter, Michael Koller, Jody Vykoukal, more

Archives of Orthopaedic and Trauma Surgery > 2015 > 135 > 10 > 1475-1484

Introduction Thumb trapeziometacarpal joint (TMJ) arthritis is among the most common degenerative joint diseases of the hand and predominantly affects patients in their fifth or sixth decade of life. Mid-term results of the most common surgical procedures were inconclusive regarding the superiority of one particular treatment method. This study presents the long-term outcomes of a modified Epping...

article

Dexamethasone-related osteogenic differentiation of dental follicle cells depends on ZBTB16 but not Runx2

Oliver Felthaus, Martin Gosau, Silvan Klein, Lukas Prantl, more

Cell and Tissue Research > 2014 > 357 > 3 > 695-705

Dental follicle cells (DFCs) can be artificially differentiated into mineralizing cells. With a dexamethasone-based differentiation protocol, transcription factors ZBTB16 and NR4A3 are highly upregulated but Runx2 and other osteogenic marker genes are not. Previous studies have suggested the involvement of a Runx2-independent differentiation pathway. The objective of this study is to further elucidate...

article

Evidence‐based topical management of chronic wounds according to the T.I.M.E. principle

Silvan Klein, Stephan Schreml, Juergen Dolderer, Sebastian Gehmert, more

JDDG: Journal der Deutschen Dermatologischen Gesellschaft > 11 > 9 > 819 - 829

The number of patients suffering from chronic wound healing disorders in Germany alone is estimated to be 2.5–4 million. Therapy related expenses reach 5–8 billion Euros annually. This number is partially caused by costly dressing changes due to non‐standardized approaches and the application of non‐evidence‐based topical wound therapies. The purpose of this paper is to elucidate a straightforward...

article

Evidenzbasierte topische Therapie chronischer Wunden nach dem T.I.M.E.‐Prinzip

Silvan Klein, Stephan Schreml, Juergen Dolderer, Sebastian Gehmert, more

JDDG: Journal der Deutschen Dermatologischen Gesellschaft > 11 > 9 > 819 - 830

article

Type I Collagen Nerve Conduits for Median Nerve Repairs in the Forearm

Thomas Dienstknecht, Silvan Klein, Jody Vykoukal, Sebastian Gehmert, more

Journal of Hand Surgery > 2013 > 38 > 6 > 1119-1124

To evaluate patients with median nerve damage in the distal forearm treated with type 1 collagen nerve conduits. Nine patients with damage to the median nerve in the distal forearm underwent treatment with a type 1 collagen nerve conduit. The nerve gaps ranged between 1 and 2 cm. An independent observer reexamined patients after treatment at a minimal follow-up of 14 months and a mean follow-up...

article

Temperature Profile of Radiofrequency Probe Application in Wrist Arthroscopy: Monopolar Versus Bipolar

Michaela Huber, Christoph Eder, Michael Mueller, Richard Kujat, more

Arthroscopy: The Journal of Arthroscopic and Related Surgery > 2013 > 29 > 4 > 645-652

The purpose of this study was to investigate the changes in temperature during wrist arthroscopy comparing monopolar and bipolar radiofrequency energy (RFE).A standard wrist arthroscopy was performed on 14 arms of 7 cadavers without irrigation or with continuous irrigation with 0.9% saline solution and gravity-assisted outflow through an 18-gauge needle. We treated 7 wrists with a bipolar device (VAPR...

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INFONA - science communication portal

Search results for: Lukas Prantl

Comparison of venous couplers versus hand‐sewn technique in 4577 cases of DIEP‐flap breast reconstructions – A multicenter study

SARS‐CoV‐2 infection and venous thromboembolism after surgery: an international prospective cohort study

Effects of pre‐operative isolation on postoperative pulmonary complications after elective surgery: an international prospective cohort study

Timing of surgery following SARS‐CoV‐2 infection: an international prospective cohort study

Feasibility study of preoperative microvessel evaluation and characterization in perforator flaps using various modes of color‐coded duplex sonography (CCDS)

Reconstruction of chronic scapholunate dissociation with the modified scapholunate axis method (SLAM)

Imaging of pH and pO₂ gives insight in molecular processes of irradiated cells

Anatomical study of the zygomatic and buccal branches of the facial nerve: Application to facial reanimation procedures

Fotodokumentation ästhetischer Behandlungen

The ideal ear position in Caucasian females

The spreaded gracilis flap revisited: Comparing outcomes in lower limb reconstruction

Modifikation der Zentrifugation zur Reduktion der Leukozytenzahl in Platelet-rich Plasma und die Auswirkung auf die Proliferation von autologen mesenchymalen Stammzellen

Serologic and Histologic Findings in Capsule Contracture Patients with Silicone Gel Implants

Differentiation and Plasticity of Stem Cells for Tissue Engineering

Long-term results after modified Epping procedure for trapeziometacarpal osteoarthritis

Dexamethasone-related osteogenic differentiation of dental follicle cells depends on ZBTB16 but not Runx2

Evidence‐based topical management of chronic wounds according to the T.I.M.E. principle

Evidenzbasierte topische Therapie chronischer Wunden nach dem T.I.M.E.‐Prinzip

Type I Collagen Nerve Conduits for Median Nerve Repairs in the Forearm

Temperature Profile of Radiofrequency Probe Application in Wrist Arthroscopy: Monopolar Versus Bipolar

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