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Wallmichrath J, Baumeister RGH, Gottschalk O, Giunta RE, Frick A. The free groin flap in the rat: a model for improving microsurgical skills and for microvascular perfusion studies. J Plast Surg Hand Surg 2013; 48:191-6. [DOI: 10.3109/2000656x.2013.852100] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Wallmichrath J, Birk C, Baumeister RGH, Engelhardt TO, Giunta RE, Frick A. Examination of the protective effects of heparin and recombinant tissue plasminogen activator (rtPA) in compromised adipocutaneous free flaps in the rat model using intravital video microscopy. Clin Hemorheol Microcirc 2013; 59:185-95. [PMID: 23813482 DOI: 10.3233/ch-131756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND The purpose of this study was to determine whether the focused delivery of heparin or recombinant tissue plasminogen activator (rtPA) by rinsing accords protective effects which increases the survival of free groin flaps following fatal secondary venous stasis. METHODS Free microvascular groin flaps (n = 40) were transplanted to the necks of adult Sprague-Dawley rats 20 hours before the experiment. The study groups (each n = 10 animals) were: No adjunctive treatment (Group I), Ringer's solution (Group II), heparin solution (100 IU/kg, group III) and rtPA (2 mg/kg, group IV), respectively. The flap vein was then clamped for 35 minutes. Intravital video microscopy was applied and flap viability was assessed 14 days later. RESULTS Mean flap necrosis was 90% in group I and II, whereas the rate of flap survival was 80% in group III and 60% in group IV, respectively. CONCLUSIONS Even though clinical and microvascular flap perfusion parameters in both the rtPA-group and heparin group were initially similar, it has been demonstrated here in our investigations that the flaps treated with heparin showed a higher viability rate. Therefore, we can conclude that the focused delivery of heparin and rtPA resulted in a significantly improved flap salvage.
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Zerbe S, Steffenhagen P, Parakenings K, Timmermann T, Frick A, Gelbrecht J, Zak D. Ecosystem service restoration after 10 years of rewetting peatlands in NE Germany. ENVIRONMENTAL MANAGEMENT 2013; 51:1194-1209. [PMID: 23636204 DOI: 10.1007/s00267-013-0048-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 03/25/2013] [Indexed: 06/02/2023]
Abstract
The restoration of ecosystem services, i.e., production, regulation, and information, is a global challenge, which the federal state of Mecklenburg-Vorpommern in NE Germany addressed in 2000 by rewetting over 20,000 ha of degraded peatlands within the Mire Restoration Program. We evaluated ecosystem services in 23 rewetted sites by assessing the following mire parameters within a ten year period: (a) dominant vegetation at the ecosystem level, (b) peat formation potential at the landscape level, and (c) aboveground biomass and nutrient levels. Seven to 10 years after rewetting, the wetlands formed a mosaic of vegetation types with the highest potential for peat formation and several dominant, peat-forming species accumulated high levels of aboveground biomass and nutrients (C, N, P). Common reed (Phragmites australis) accumulated the most biomass (up to 24 t dry matter/ha), and N+P during the growing season. A future management option is to annually harvest aquatic and wetland plants to reduce nutrient levels in restored mire ecosystems.
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Wallmichrath J, Baumeister R, Giunta R, Notohamiprodjo M, Frick A. Die Vielfalt in der chirurgischen Therapie beim Lymphödem – was ist aktuell? HANDCHIR MIKROCHIR P 2012; 44:334-42. [DOI: 10.1055/s-0032-1323840] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Frick A, Eriksson UK, van Oostrum J, Neutze R, de Grip W, Törnroth-Horsefield S. Nearly there: the structure of human aquaporin 2. Acta Crystallogr A 2012. [DOI: 10.1107/s010876731209695x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Wallmichrath J, Baumeister R, Herrler T, Greiner A, Pieske O, Giunta R, Frick A. Experimental study on the microsurgical or spontaneous formation of lympho-lymphonodular anastomoses in the rat model. J Plast Reconstr Aesthet Surg 2012; 65:494-500. [DOI: 10.1016/j.bjps.2011.11.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 10/15/2011] [Accepted: 11/08/2011] [Indexed: 11/30/2022]
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Spanholtz T, Holzbach T, Wallmichrath J, Pototschnig A, Deglmann C, Frick A, Giunta R. Die Behandlung der Dupuytrenschen Kontraktur mittels Kollagenase- Erste klinische Erfahrungen *. HANDCHIR MIKROCHIR P 2011; 43:275-80. [DOI: 10.1055/s-0031-1286323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Kaempfen A, Daigeler A, Largo R, Bader R, Arkudas A, Bleiziffer O, Frank J, Frick A, Huemer G, Kneser U, Scherrer D, Schwabegger A, Schaefer D, Pierer G, Hierner R. Bericht zum Workshop und Consensusmeeting zur Mikrochirurgischen Ausbildung an der 32ten Jahrestagung der Deutschsprachigen Arbeitsgemeinschaft für Mikrochirurgie der peripheren Nerven und Gefäße (DAM) 2010 in Basel. HANDCHIR MIKROCHIR P 2011; 43:262-5. [DOI: 10.1055/s-0031-1284356] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Springer S, Koller M, Baumeister RGH, Frick A. Changes in quality of life of patients with lymphedema after lymphatic vessel transplantation. Lymphology 2011; 44:65-71. [PMID: 21949975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
There are multiple treatment options for patients with chronic lymphedema, and one successful approach is lymph vessel transplantation. As quality of life assessments are frequently not utilized in standard treatment regimes, we investigated the change in quality of life for patients with chronic lymphedema (total = 212) who had undergone lymphatic vessel transplantation and conservative therapy for at least 6 months prior to operation. Quality of life was assessed by a modified standard questionnaire examining the physiological and psychological status of the patients. Results document a significant improvement in quality of life and underscore success of autologous lymphatic vessel transplantation as a therapy for lymphedema.
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Robins Wahlin TB, Frick A, Wahlin Å, Byrne G. G06 Verbal learning and memory in preclinical Huntington's disease. Journal of Neurology, Neurosurgery and Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222646.6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Frick A, Wahlin Å, Graff C, Byrne G, Robins Wahlin TB. G05 Memory for object locations in preclinical Huntington's disease. J Neurol Psychiatry 2010. [DOI: 10.1136/jnnp.2010.222646.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Daigeler A, Kaempfen A, Beier JP, Arkudas A, Horch RE, Schaefer DJ, Frick A, Huemer GM. [Microsurgical training - report on the consensus workshop of the 31st annual meeting of the German-language group for microsurgery of the peripheral nerves and vessels 2009 in Erlangen]. HANDCHIR MIKROCHIR P 2010; 42:273-6. [PMID: 20603787 DOI: 10.1055/s-0030-1255061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Based on the increasing importance of microsurgical procedures in the field of plastic and hand surgery, as well as in other related fields, a consensus workshop was held during the 31st annual meeting of the German-language working group for microsurgery of the nerves and vessels (DAM). The current state of microsurgical training and possible ways of optimisation were discussed. Furthermore, a trinational task force was established in order to develop quality criteria for a future certification of microsurgical training centres under the auspices of the DAM.
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Pytel A, Damasdi M, Frick A, Schmidt E, Zambo K, Farkas L. MP-05.05: Surgical Management of Low and Medium Risk Penile Cancers, with Isotope Guided Sentinel Lymphnode Biopsy Technic. Urology 2009. [DOI: 10.1016/j.urology.2009.07.1008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bruce D, Frick A, Rymer J, Robinson J, Ylikorkala O. A comparison of hormone therapies on the urinary excretion of prostacyclin and thromboxane A2. Climacteric 2009; 11:447-53. [DOI: 10.1080/13697130802387619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Förster M, Frick A, Walentowski H, Kleinschmit B. Approaches to utilising QuickBird data for the monitoring of NATURA 2000 habitats. COMMUNITY ECOL 2008. [DOI: 10.1556/comec.9.2008.2.4] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Luque Moreno A, Duran Núñez A, Bergadà Masó A, Frick A, Gallés C. Osteomielitis aguda y neumonía comunitaria por Staphylococcus aureus resistente a meticilina. An Pediatr (Barc) 2008; 68:373-6. [DOI: 10.1157/13117710] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Safidine Z, Fellahi S, Frick A. Crystallization behavior of PP/PP-g-MAH/GFR PA66 blends: Establishment of their continuous-cooling-transformation of relative crystallinity diagrams. J Appl Polym Sci 2007. [DOI: 10.1002/app.25768] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Abstract
In the last eight years we performed 63 re-interventions because of recurrent carpal tunnel syndromes. Intact parts of the retinaculum were the reason for persistent symptoms in 38 patients. 21 patients suffered from scar tethering, two patients from circumferential fibrosis of the nerve. In one patient a ganglion and in another patient a direct injury to the median nerve was detected. In 21 patients short incisions were performed in the primary procedures. Since the introduction of endoscopic carpal tunnel release, an open decompression via a short incision is recommended as an alternative. Since then we encounter an increase of necessary operative revisions after short incisions. Optical tools may increase the survey especially in short incisions. In extended teno-synovialitis of the flexor tendons, a longer incision over the wrist enables adequate conditions for a safe teno-synovialectomy. The length of the incision has to be chosen according to the pathologic-anatomic situation, the disposable equipment and the experience of the surgeon.
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Wallmichrath J, Baumeister R, Frick A. Lympho-lymphonodular anastomoses, proof of patency by injection of patent blue dye – A study in the rat model. J Plast Reconstr Aesthet Surg 2006. [DOI: 10.1016/j.bjps.2006.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Baumeister RGH, Frick A. Kurz oder lang – ist das die Frage? Zur Problematik des Zugangswegs bei der Karpaldachspaltung. HANDCHIR MIKROCHIR P 2005. [DOI: 10.1055/s-2004-862450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Frick A, Hornung H, Baumeister RGH. Mikrochirurgie im Spannungsfeld von ambulantem Operieren und stationsersetzenden Eingriffen im Krankenhaus und vollpauschaliertem Entgeltsystem (Diagnosis-Related Groups – DRG). HANDCHIR MIKROCHIR P 2005. [DOI: 10.1055/s-2005-864864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Bergemann N, Kress KR, Abu-Tair F, Frick A, Kopitz J. Increase in Plasma Concentrations of Amisulpride after Receiving Co-Medication with Lithium. PHARMACOPSYCHIATRY 2005. [DOI: 10.1055/s-2005-862621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bergemann N, Kress KR, Abu-Tair F, Frick A, Kopitz J. Valproate Lowers Plasma Concentrations of Olanzapine. PHARMACOPSYCHIATRY 2005. [DOI: 10.1055/s-2005-862622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bergemann N, Frick A, Kress KR, Kopitz J. Therapeutic drug monitoring data: No influence of amisulpride on clozapine plasma concentration. PHARMACOPSYCHIATRY 2004. [DOI: 10.1055/s-2003-825274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Bergemann N, Kopitz J, Kress KR, Frick A. Plasma amisulpride levels in schizophrenia or schizoaffective disorder. Eur Neuropsychopharmacol 2004; 14:245-50. [PMID: 15056484 DOI: 10.1016/j.euroneuro.2003.09.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2002] [Revised: 09/11/2003] [Accepted: 09/11/2003] [Indexed: 11/27/2022]
Abstract
The atypical antipsychotic drug amisulpride is a benzamide with specific antagonistic properties, which target dopamine D(2) and D(3) receptors, preferentially in the limbic system. Amisulpride is readily absorbed from the gastrointestinal tract, distributed to all body systems with little binding to plasma proteins. Elimination occurs mainly through the kidneys as unchanged drug. In contrast, hepatic metabolism is of minor significance and primarily yields two inactive metabolites. Very little is known about the plasma concentrations of amisulpride in patients at varying oral doses or about clinically relevant interactions with co-medication. The aim of the present investigation was to elucidate the factors, which affect amisulpride levels in schizophrenic patients. The plasma amisulpride levels of 85 patients with schizophrenia or schizoaffective disorder (mean age: 34.0+/-11.4 years; 40 women, 45 men) were assessed by high-performance liquid chromatography (HPLC) with fluorometric detection. The average daily dose of amisulpride was 772.3 mg (S.D. 346.7 mg) and the mean amisulpride plasma concentration was 424.4 ng/ml (S.D. 292.8 ng/ml). The interindividual variance of the amisulpride plasma concentration was high; furthermore, the plasma concentration increased linearly with the daily oral dose (r=0.50, p<0.001). Age and gender showed a significant effect on the dose-corrected amisulpride plasma concentrations-older patients and women had higher dose-corrected amisulpride plasma concentrations than younger patients and men. However, cigarette consumption had no effect on the amisulpride plasma concentrations. Regarding co-medication with lithium and/or clozapine, significantly higher amisulpride plasma concentrations were found as compared to monotherapy, whereas other co-medications such as benzodiazepines and various conventional antipsychotics had no effect on the amisulpride plasma concentrations. The results, the possible pathomechanisms and the clinical relevance are discussed. The findings need to be confirmed in larger patient samples and with a wider range of co-medications.
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