K Hörmann

Universität Mannheim, Mannheim, Baden-Württemberg, Germany

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Publications (548)649.22 Total impact

  • Aktuelle Dermatologie 02/2014; 41(01/02):35-43. DOI:10.1055/s-0034-1365510
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    ABSTRACT: The treatment of diseases of the lingual tonsils is still under debate, and surgical interventions are often associated with significant morbidity and complications. The aim of the present study was to evaluate the safety of lingual tonsillectomy using cold ablation (coblation) as a new treatment of lingual tonsil diseases. In this retrospective, bicentric study, we included all patients between 2005 and 2012 who underwent cold ablation (Coblation(®)) of the lingual tonsils. We assessed the frequency of postoperative complications based on the patients' charts. A total of 108 patients (47 ± 13, 6 years) underwent lingual tonsillectomy using coblation. All patients were operated on under general anesthesia as inpatients. Intraoperative complications did not occur. Three patients (2.8 %) needed revision surgery due to postoperative hemorrhage, and in one of those cases, three revisions were necessary. There was no postoperative airway compromise and no need for tracheostomy. There was no hypoglossal nerve paralysis, but in the case needing multiple revisions, a weakness of the hypoglossal nerve persisted. In all the cases, oral intake was possible with adequate analgesia. Coblation of the tongue base is a safe procedure with a relatively low rate of postoperative complications. Postoperative hemorrhage is the most relevant complication that occurred in our series of patients. Future studies are needed to evaluate the efficacy of the procedure in the treatment of obstructive sleep apnea.
    Archives of Oto-Rhino-Laryngology 01/2014; 271(6). DOI:10.1007/s00405-013-2845-x · 1.61 Impact Factor
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    ABSTRACT: The cancer stem cell (CSC) theory implies that CSCs are surrounded by supportive stromal cells, which are known as the CSC niche. Stromal cell-derived factor-1 (SDF-1) shows a multitude of functional effects in head and neck squamous cell carcinoma (HNSCC) cells, including migration and polarization. Therefore, the SDF-1-CXCR4 axis may be involved in the pathophysiology of the progression, recurrence and metastasis of malignant diseases of the head and neck. In the present study, the CD44(+) HNSCC UM-SCC-11A cell line was used as a model for CSCs. The interaction between the UM-SCC-11A cells and the supportive microenvironmental cells, including fibrocytes, human umbilical vein endothelial cells (HUVECs) and human microvascular vein endothelial cells (HMVECs) was evaluated. All the cell types that were tested were shown to secrete different concentrations of SDF-1 into the surrounding culture medium [mean (m)fibro, 1243.3±156.2 pg/ml; mHMVEC, 1061.4±23.2 pg/ml; mHUVEC, 849.6±110.9 pg/ml]. The migration of the UM-SCC-11A cells towards the supportive cells was increased by a higher supply of SDF-1 (contrfibro, 315.23±61.55 μm; mfibro, 477.73±143.7 μm; Pfibro=0.003; contrHMVEC, 123.41±66.68 μm; mHMVEC, 249.04±111.95 μm; PHMVEC=0.004; contrHUVEC, 189.7±93.26 μm; mHUVEC, 260.82±161.58 μm). The amount of the UM-SCC-11A cells that migrated towards the differentiated fibrocytes was significantly higher than that which migrated towards the HMVECs or HUVECs (Pfibro/HMVEC=2.12E-11; Pfibro/HUVEC=2.28E-5). Cell-cell interaction by podia formation of the UM-SCC-11A cells was observed in all the supportive cell types that were tested. Broadly based cell-cell contacts were observed. By contrast, digitiform podia formations presented by the UM-SCC-11A cells were determined using fluorescence microscopy. The SDF-1-CXCR4 axis is postulated to be a crucial pathway in the interaction between CSCs and their surrounding supportive cells. Understanding the cell-cell interactions in the CSC niche using in vitro models may aid in gaining further insight into these mechanisms and finding new strategies of therapy in this field.
    Oncology letters 01/2014; 7(1):82-86. DOI:10.3892/ol.2013.1673 · 0.99 Impact Factor
  • Allergologie 01/2014; 37(01):11-19. DOI:10.5414/ALX01584 · 0.30 Impact Factor
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    ABSTRACT: Incidence of oropharyngeal head and neck squamous cell carcinoma (HNSCC) induced by the human papilloma virus (HPV) is rising. HNSCC is the sixth most common neoplasia worldwide. The survival rate remains poor, thus innovative therapy approaches are necessary. Everolimus, an inhibitor of the mammalian target of rapamycin, as well as the multi-tyrosine kinase inhibitors sorafenib (targeting vascular endothelial growth factor receptor, platelet-derived growth factor receptor and RAF) and sunitinib (targeting vascular endothelial growth factor receptor, platelet-derived growth factor receptor, stem cell factor receptor, RET proto-oncogene and colony-stimulating factor), have shown a remarkable antitumor effect against various tumor entities, with moderate side-effects. These drugs are administered orally, which should lead to higher patient compliance and less hospitalisation. Aim: This study sought to evaluate the expression of PDGFR α/β and hypoxia-inducible factor-1α (HIF-1α) and their alterations induced by everolimus, sorafenib and sunitinib in chemonaïve HPV-positive and HPV-negative HNSCC. To our knowledge, this is the first in vitro study to investigate such cases. We incubated HPV-positive CERV196 and HPV-negative HNSCC 11A and 14C cells for 2 to 8 days with increasing concentration of drugs. Expression of PDGFR α/β and HIF-1α was measured by enzyme-linked immunosorbent assay and compared to a chemonaïve controls. Our study showed that PDGFR α/β and HIF-1α were expressed in all three cell lines. Incubation with everolimus, sorafenib or sunitinib led to a decrease in PDGFR α/β and HIF-1α expression, depending on the HPV status. A statistically significant alteration of PDGFR α/β was detected in CERV196 only. Thus, HPV-positive HNSCC exhibited a higher sensitivity to the drugs used compared to HPV-negative HNSCC 11A and 14C tumor cells. A significant reduction of HIF-1α was measured for HNSCC 11A and 14C only. An escalation of drug concentration had no significant effect. We showed that these novel agents led to a significant reduction of PDGFR and HIF-1α, depending on the HPV status. HPV positivity is associated with increased chemosensitivity and may be associated with better locoregional control and overall patient survival compared to HPV negativity. Further studies are necessary to investigate the efficacy and safety of these agents in the treatment of HPV-positive and -negative HNSCC in vivo.
    Anticancer research 12/2013; 33(12):5385-93. · 1.87 Impact Factor
  • G.M. Bran, K. Hörmann, J. Gosepath
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    ABSTRACT: Die Korrektur komplexer Narben im Gesichtsbereich erfordert individuell angepasste, oft multimodale Therapiekonzepte. Der vorliegende Beitrag erläutert unterschiedliche Techniken zur Korrektur von Kontrakturen, atrophen Narben, Narben in behaarten Gesichtsbereichen und Keloiden im Bereich der Ohrmuscheln. Darüber hinaus werden adjuvante Verfahren innerhalb der einzelnen Themenkomplexe vorgestellt.
    HNO 12/2013; 61(12). DOI:10.1007/s00106-013-2720-5 · 0.54 Impact Factor
  • G M Bran, K Hörmann, J Gosepath
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    ABSTRACT: Correction of complex facial scars frequently requires individualized, multimodal strategies, which are composed of various therapeutic measures. This report provides information on techniques for correction of contractures, atrophic scars, scars within hair-bearing regions of the face and auricular keloids. Additionally, we present adjuvant procedures in a subject-related manner.
    HNO 12/2013; 61(12):997-1004. · 0.54 Impact Factor
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    ABSTRACT: The creation of functional muscles/muscle tissue from human stem cells is a major goal of skeletal muscle tissue engineering. Mesenchymal stem cells (MSCs) from fat/adipose tissue (AT-MSCs), as well as bone marrow (BM-MSCs) have been shown to bear myogenic potential, which makes them candidate stem cells for skeletal muscle tissue engineering applications. The aim of this study was to analyse the myogenic differentiation potential of human AT-MSCs and BM-MSCs cultured in six different cell culture media containing different mixtures of growth factors. The following cell culture media were used in our experiments: mesenchymal stem cell growth medium (MSCGM)™ as growth medium, MSCGM + 5-azacytidine (5-Aza), skeletal muscle myoblast cell growth medium (SkGM)-2 BulletKit™, and 5, 30 and 50% conditioned cell culture media, i.e., supernatant of human satellite cell cultures after three days in cell culture mixed with MSCGM. Following the incubation of human AT-MSCs or BM-MSCs for 0, 4, 8, 11, 16 or 21 days with each of the cell culture media, cell proliferation was measured using the alamarBlue® assay. Myogenic differentiation was evaluated by quantitative gene expression analyses, using quantitative RT-PCR (qRT-PCR) and immunocytochemical staining (ICC), using well-defined skeletal markers, such as desmin (DES), myogenic factor 5 (MYF5), myosin, heavy chain 8, skeletal muscle, perinatal (MYH8), myosin, heavy chain 1, skeletal muscle, adult (MYH1) and skeletal muscle actin-α1 (ACTA1). The highest proliferation rates were observed in the AT-MSCs and BM-MSCs cultured with SkGM-2 BulletKit medium. The average proliferation rate was higher in the AT-MSCs than in the BM-MSCs, taking all six culture media into account. qRT-PCR revealed the expression levels of the myogenic markers, ACTA1, MYH1 and MYH8, in the AT-MSC cell cultures, but not in the BM-MSC cultures. The muscle-specific intermediate filament, DES, was only detected (by ICC) in the AT-MSCs, but not in the BM-MSCs. The strongest DES expression was observed using the 30% conditioned cell culture medium. The detection of myogenic markers using different cell culture media as stimuli was only achieved in the AT-MSCs, but not in the BM-MSCs. The strongest myogenic differentiation, in terms of the markers examined, was induced by the 30% conditioned cell culture medium.
    International Journal of Molecular Medicine 11/2013; 33(1). DOI:10.3892/ijmm.2013.1555 · 1.88 Impact Factor
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    ABSTRACT: Signs of pharyngeal neurodegeneration have been detected in patients with obstructive sleep apnea (OSA). Along with this neurodegeneration, a decreased pharyngeal sensitivity to mechanical stimulation has been described. The decreased sensitivity may play a role in the pathophysiology of this disease. The aim of the study was to investigate the chemosensitivity of the pharyngeal mucosa in patients with OSA compared with controls. Healthy controls and patients with OSA (age: 30-60 years) were included. Testing of oropharyngeal chemosensitivity was performed with subjective intensity ratings of capsaicin (SIR, visual analogue scale 0-10), air puffs (presented with an olfactometer), and stimulation with CO2 at the posterior pharyngeal wall. A 2-point discrimination test at the soft palate, an intensity rating of capsaicin at the tongue, and a nasal lateralization test were performed. Twenty-six patients with OSA and 18 healthy controls were included. No differences were detected in the SIR of capsaicin at the tongue or in the nasal lateralization test. At the pharynx, a decreased sensitivity to capsaicin (OSA: 6.8±2.3; healthy control: 8.6±1.3), air puffs (OSA: 2.8±1.9; healthy control: 4.2±1.6), and stimulation with CO2 (OSA: 1.5±1.7; healthy control: 2.8±1.8) were demonstrated in patients with OSA (all P < 0.05). Two-point discrimination at the soft palate was reduced with statistical significance in the OSA group (OSA: 11.5±5.4mm; healthy control: 5.0±2.4mm). The results suggest reduced pharyngeal chemosensitivity in OSA patients in addition to the reduced mechanical pharyngeal sensitivity shown with 2-point discrimination. This demonstrates peripheral neurodegeneration in the context of this disease.
    Chemical Senses 07/2013; DOI:10.1093/chemse/bjt031 · 3.28 Impact Factor
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    ABSTRACT: Head and neck squamous cell carcinoma (HNSCC) is the sixth most common type of cancer worldwide. In several tumour entities, the tyrosine kinase receptor c-KIT is associated with tumour transformation in the epithelial tissue in cases of aberrant expression. Furthermore, tumour development and dissemination are a result of dysregulated cellular pathways such as the WNT/β-catenin pathway. β-Catenin is a multifunctional protein within the canonical WNT signalling pathway and a pivotal factor for the stabilization of cell-cell interactions. In malignant tissues, β-catenin triggers tumour proliferation and progression. The aim of this study is to investigate the expression patterns of c-KIT and β-catenin in human papillomavirus-negative and p16-positive SCC and to evaluate the chemosensitivity of the tumour cells to the chemotherapeutical agents docetaxel and 5-fluorouracil (5-FU). We incubated the tumour cell lines with docetaxel (5 μmol/ml) and 5-FU (1 μmol/ml) and detected β-catenin and c-KIT by immunohistochemistry and enzyme-linked immunosorbent assay (ELISA) after 48, 72, 120, 192 and 240 h. We found a reliable trend towards decreased β-catenin expression levels in p16-positive and p16-negative tumour cell lines when incubated with docetaxel, in addition to induced apoptotic effect. At best, 5-FU had a slight influence on the alteration of the expression of β-catenin. Dose escalation of docetaxel and 5-FU had no statistically significant effect on the expression of β-catenin or c-KIT. In HPV-negative HNSCC, a reduced expression level of β-catenin and c-KIT was detected in an incubation period-dependent manner. p16-transformed SCC (CERV196) cells were characterized by a reduced susceptibility to docetaxel induced alteration of β-catenin expression. We were unable to confirm the clinically-substantiated increased chemosensitivity of p16-positive tumour cells in vitro. Extended studies and clinical trials are needed to investigate these findings further in HPV-associated HNSCC.
    Anticancer research 06/2013; 33(6):2457-65. · 1.87 Impact Factor
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    ABSTRACT: PURPOSE: Continuous positive airway pressure (CPAP) is the gold standard in the treatment of obstructive sleep apnea (OSA), but its impact on ciliary function is unclear to date. Furthermore, CPAP is associated with numerous side effects related to the nose and upper airway. Humidified CPAP is used to relieve these symptoms, but again, little is known regarding its effect on ciliary function of the nasal respiratory epithelium. METHODS: In this prospective, randomized, crossover trial, 31 patients with OSA (AHI >15/h) were randomized to two treatment arms: nasal continuous positive airway pressure (nCPAP) with humidification or nCPAP without humidification for one night in each modality to assess short-term effects of ciliary beat frequency (CBF) and mucus transport time (MTT) and consecutively for 8 weeks in each modality to assess long-term effects in a crossover fashion. RESULTS: The baseline CBF was 4.8 ± 0.6 Hz, and baseline MTT was 540 ± 221 s. After one night of CPAP with and without humidification, ciliary function increased moderately yet with statistical significance (p <0.05). The short-term groups with and without humidification did not differ statistically significant. Regarding long-term effects of CPAP, a statistically significant increase in ciliary function above the baseline level and above the short-term level was shown without humidification (7.2 ± 0.4 Hz; 402 ± 176 s; p <0.01). The increase above baseline level was even more pronounced with humidification (9.3 ± 0.7 Hz; 313 ± 95 s; p <0.01). There was a statistically significant difference between both groups at long-term assessment with regard to CBF (p <0.01). CONCLUSIONS: Independent of airway humidification, nCPAP has moderate effects on short-term ciliary function of the nasal respiratory epithelium. However, a significant increase in ciliary function-both in terms of an increased CBF and a decreased MTT-was detected after long-term use. The effect was more pronounced when humidification was used during nCPAP.
    Sleep And Breathing 05/2013; 18(1). DOI:10.1007/s11325-013-0853-0 · 2.87 Impact Factor
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    ABSTRACT: Head and neck squamous cell carcinoma (HNSCC) is the most common malignant epithelial tumor in the upper aerodigestive tract. The incidence of HNSCC induced by the oncogenic human papilloma virus (HPV) is rising, indicating a growing importance of the viral etiology. Cell proliferation, migration and tumor vascularization are regulated by a set of angiogenic peptides such as PDGF (platelet-derived growth factor), PDGFRα/β (platelet-derived growth factor receptor α/β) and VEGF (vascular endothelial growth factor). In locally advanced HNSCC docetaxel is used for induction chemotherapy (ICT) combined with platinum-based chemotherapy and 5-fluorouracil (5-FU). This study sought to evaluate the expression of angiogenic factors (VEGF, PDGF and PDGFRα/β) in HPV-positive (CERV196) and HPV-negative squamous cell carcinoma (HNSCC 11A and 14C) and the efficacy of chemotherapy with docetaxel as a potential treatment modality, compared to 5-FU as a single-drug application. Tumor cell lines were incubated with 5-FU or docetaxel at a concentration of 1.0 and 5.0 μmol/ml. Enzyme-linked immunosorbent assay (ELISA) and immunohistochemical analyses were carried out after 48, 72, 120, 192 and 240 hours, in order to identify changes in protein expression of VEGF, PDGF and PDGFRα/β. We demonstrated a significant reduction of VEGF and PDGFRβ expression after incubation with docetaxel by ELISA and of PDGF by immunohistochemistry, irrespective of the HPV status, whereas the application of 5-FU had a significantly weaker impact on the expression of angiogenic peptides. HPV-positive CERV196 cells were characterized by a reduced susceptibility to a docetaxel-altered expression. Although neither of the applied drugs are selective anti-angiogenic agents, docetaxel surprisingly was demonstrated to cause a significant decrease of angiogenic factors in this study.
    Anticancer research 05/2013; 33(5):1951-61. · 1.87 Impact Factor
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    ABSTRACT: Stromal cell-derived factor-1α (SDF-1α), also known as CXCL12, has variable effects on a plurality of cells. CXCR4 has been identified as its corresponding receptor. The SDF-1-CXCR4 axis is postulated to be a crucial key pathway in the interaction between (cancer) stem cells and their surrounding supportive cells in the cancer stem cell niche. We evaluated the expression of CD44 as a cancer stem cell marker and of CXCR4 in human HNSCC tissue samples. Afterwards, we monitored the concentration of SDF-1 in peripheral blood samples of HNSCC patients and healthy donors. We showed that CD44 and CXCR4 are expressed in human HNSCC tissues. Markedly, CD44 showed a high expression in HNSCC cells bordering cancer stromal cells. CXCR4 was mainly expressed in HNSCC tumor nests, but not in the surrounding stromal cells. No significant difference was noted between the SDF-1 concentration in the peripheral blood of HNSCC patients compared to healthy donors. We showed that CD44, as a stem cell marker in HNSCC, is located mainly at the borderline of HNSCC tumor nests with the surrounding cells. In addition, we demonstrated that CXCR4 as the corresponding receptor to SDF-1 is highly expressed in HNSCC tumor nests, but not in the tumor stroma. We collected evidence that SDF-1-CXCR4 interaction may be a crucial pathway in cell trafficking in the cancer stem cell niche of HNSCC, while SDF-1 was not detected in the peripheral blood of HNSCC patients. The SDF-1-CXCR4 axis may play an important role in the cancer stem cell theory of HNSCC. As SDF-1α also exhibits a multitude of functional effects on HNSCC cells, such as migration and polarization, it may be possible that the SDF-1-CXCR4 axis is also involved in the pathophysiology of the progression, recurrence and metastasis of malignant disease. Understanding these interactions may help to gain further insight into these mechanisms and as such help to discover new strategies of therapy.
    Oncology Reports 04/2013; 29(6). DOI:10.3892/or.2013.2380 · 2.19 Impact Factor
  • K Hörmann, H Sadick
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    ABSTRACT: Objective: Review of the literature on the role of surgery in the management of head and neck cancer in the era of organ preservation. Method: Literature search based on the essential practice guidelines set out by the US National Comprehensive Cancer Network. Results: Despite the increasing popularity of non-surgical treatment options, the surgeon remains a key figure in the multidisciplinary head and neck cancer team, along with the radiation oncologist, the medical oncologist and the speech and swallowing therapist. Even when organ preservation is successful, early and late toxicity may cause serious complications, including laryngeal dysfunction with a 'frozen larynx'. When organ preservation fails, salvage surgery is often associated with increased complications and reduced survival. Conclusion: There is a definite need to apply more rigorous standards to the use of organ preservation strategies, and to re-evaluate the role of surgery in head and neck cancer treatment.
    The Journal of Laryngology & Otology 01/2013; 127(02):1-7. DOI:10.1017/S0022215112002988 · 0.70 Impact Factor
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    ABSTRACT: Stromal cell-derived factor-1α (SDF-1α), also known as CXCL12, has variable effects on a plurality of cells. It is known to have selective effects on cell migration, morphology, survival and cell homing. As such the SDF-1-CXCR4 axis is postulated to be a crucial key pathway in the interaction between (cancer) stem cells and their surrounding supportive cells, the so-called (cancer) stem cell niche. We evaluated the expression of CD44 as a cancer stem cell (CSC) marker and the expression of CXCR4 in the head and neck squamous cell carcinoma (HNSCC) cell line UM-SCC 11A. In addition, we monitored proliferation, formation of podia and migration of UM-SCC 11A cells under the influence of SDF-1α. Whereas SDF-1α induced the formation of podia of CD44+ CXCR4+ UM-SCC 11A cells in a dose-dependent manner and the maximum number of cells exhibiting the formation of podia was observed under the influence of 10 ng/ml SDF-1α (P=5.3x10-6), the highest number of migrating cells was noted using a concentration of 100 ng/ml (P=0.027). Proliferation and survival were not affected by SDF-1α. We showed that UM-SCC 11A cells could be a target for SDF-1α by CXCR4 expression and these cells also showed characteristics of HNSCC CSCs via CD44 expression. We demonstrated that SDF-1α is a chemoattractant for UM-SCC 11A cells, and a maximum directed migration was achieved under the influence of 100 ng/ml SDF-1α. Changes in cell morphology by presenting filopodia or a prominent uropod were noted following treatment of 10 ng/ml SDF-1α. The SDF-CXCR4 axis may play a crucial role in the interaction between CSCs and their supportive cells in the CSC niche. Understanding these interactions may help to gain further insight into the pathophysiology of the progression and recurrence of malignant diseases and thus help to develop novel strategies for therapy.
    Oncology Reports 12/2012; 29(2). DOI:10.3892/or.2012.2171 · 2.19 Impact Factor
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    ABSTRACT: The central processing of olfactory stimuli is different compared to other sensory systems, as they are not followed by arousals at least with regard to pure olfactory substances such as hydrogen sulfite. It is still unclear, however, whether a stimulus with a higher significance to the sleeper increases arousal frequency. Fifteen healthy volunteers participated in this controlled trial. Intranasal chemosensory stimulation was performed during sleep with an olfactometer. Artificial smoke was selected as an olfactory stimulus with high significance for different stimulus durations (1, 5, and 20 s), and carbon dioxide (CO2) was used in a concentration of 40 % v/v for isolated trigeminal stimulation as an internal control. Arousal reactions in relation to chemosensory stimulation during sleep were assessed with the help of overnight sleep recordings during 30 nights of testing. Stimulation with an artificial smoke did not increase arousal frequency. In contrast, stimulation with CO2 leads to an increase in arousal frequency. Even for the longest stimulus duration of artificial smoke, a statistically significant increase in arousal frequency could not be detected. Even a strong and significant olfactory stimulus such as artificial smoke does not elicit arousals during human sleep. Overall, the results confirm the unique role of the olfactory system in sensory physiology.
    Chemosensory Perception 12/2012; 5(3-4). DOI:10.1007/s12078-012-9131-y · 1.37 Impact Factor
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    09/2012; 23(9):48-55. DOI:10.1007/s15016-012-0326-x
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    ABSTRACT: Hintergrund Mit sprachaudiometrischen Untersuchungen lassen sich keine strukturierten Aussagen des Patienten hinsichtlich eines tatsächlichen Nutzens einer Hörgeräteversorgung aus seinem individuellen Erleben heraus erhalten. Diese Lücke wird durch die Anwendung von Frageninventaren geschlossen. Der APHAB (Abbreviated Profile of Hearing Aid Benefit, deutsche Version) ist ein evaluiertes Inventar, das anhand von je 6 Fragen zu vier verschiedenen Hörsituationen die speziellen Probleme eines Schwerhörigen ohne und mit Hörgeräten (HG) ermittelt. Patienten und Methoden 560 Patienten wurden vor und nach einer Hörgeräteversorgung mittels APHAB zu ihrem Hörvermögen befragt. Zudem wurden noch Angaben zu bisherigen Erfahrungen mit HG, der täglichen Verwendungsdauer und dem Grad der Schwerhörigkeit erfasst. Ergebnisse Das Durchschnittsalter der Patienten lag bei knapp 70 Jahren, 84% der Patienten erhielten zum ersten Mal ein HG im Leben, 83% wiesen eine mittel- bis hochgradige Schwerhörigkeit auf. Die APHAB-Ergebnisse der Befragung wurden in Perzentil- und Kontingenztabellen aufbereitet; in Letzterer lassen sich bedingte Wahrscheinlichkeiten für den potenziellen Nutzen eines HG unter Kenntnis der Antworten eines Patienten ohne HG für jede APHAB-Skala ableiten. Schlussfolgerungen Der APHAB kann regelmäßig im Rahmen einer HG-Versorgung zur Beurteilung des Nutzens von HG und zum Erkennen von besonders problematischen Hörsituationen eines Patienten eingesetzt werden. Er ergänzt die bisher gebräuchlichen Methoden, insbesondere den Freiburger Sprachtest, um Angaben aus der Sicht des Patienten, sodass die Qualität von Diagnostik und Therapie für den schwerhörigen Patienten verbessert, der Erfolg einer HG-Versorgung qualitativ erfasst und besondere Problembereiche vorhergesagt und damit die Anzahl ungenutzter Hörgeräte möglicherweise reduziert werden können.
    HNO 07/2012; 60(7). DOI:10.1007/s00106-011-2466-x · 0.54 Impact Factor
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    ABSTRACT: Head and neck squamous cell carcinoma (HNSCC) is an aggressive epithelial malignancy. It is known to be the most common neoplasm appearing in the upper aerodigestive tract. The poor 5‑year survival rate has remained unchanged in the last decades even though improved techniques in surgery, radiation and chemotherapy have been established. In contrast to the overall decreasing incidence of head and neck cancer in the US, the incidence of HPV-associated oropharyngeal cancer is increasing, indicating the importance of viral etiology. Furthermore, growth and invasion of HNSCC are strongly influenced by the extracellular matrix (ECM). Matrix metalloproteinases (MMP) have been shown to play key roles in the remodeling of the ECM. Imatinib (STI 571) was originally designed to inhibit the BCR-ABL tyrosine kinase in chronic myeloid leukaemia. But it also has an inhibitory impact, e.g., on the protein-tyrosine-kinase (PTK) receptor c-kit and on its PTK activity in HNSCC. In this study, we incubated the HNSCC cell lines HNSCC 11A and 14C and the p16-positive SCC line CERV196 with increasing concentrations of imatinib or carboplatin. After an incubation time of up to 10 days, we evaluated MMP-2 and -14 expression by ELISA techniques and immunohistochemistry. MMP-2 and -14 expression was demonstrated in all incubated tumor cell lines. Especially incubation with imatinib resulted in a significant decrease in MMP expression in incubated cell lines. Our results indicate that the expression of MMP-2 and -14 is suppressed in the presence of imatinib. Thus, imatinib may exert in part its inhibitory effect on malignant cell growth via the blockage of the signal transduction of PTK receptors. Further studies are warranted, especially keeping in mind the moderate toxicity of imatinib.
    Oncology Reports 07/2012; 28(1):172-8. DOI:10.3892/or.2012.1766 · 2.19 Impact Factor
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    ABSTRACT: Speech audiometry studies do not deliver structured testimony of patients as to the actual benefit of hearing aids based on individual daily life experiences. This deficiency can be resolved by applying structured inventory questionnaires. The APHAB (German version) is an evaluated inventory questionnaire consisting of six questions put to patients with hearing deficiencies with and without hearing aids in four different hearing situations. We collected the APHAB data of 560 patients before and after fitting hearing aids. We also gathered personal data as to age, prior experience with hearing aids, duration of daily use of the hearing aid and degree of hearing loss. The average age of the patients was a little under 70 years, 84% had just received their first hearing aid, and 83% exhibited moderate or severe hearing loss. The APHAB results were classified in percentile and contingency tables. The latter allow one to determine conditional probabilities of the potential success of fitting a hearing aid to a new patient for each APHAB scale. The APHAB can be applied regularly to measure the benefit of fitting a hearing aid to a patient in particular in problematic hearing situations. By registering the personal view of the patients, it expands the scope of the standard methods (e.g., speech audiometry) so that the quality of diagnostics and therapy can be improved. It qualitatively records the success of hearing aid fitting, predicts potential problem areas and thereby may reduce the number of unused hearing aids.
    HNO 07/2012; 60(7):626-36. · 0.54 Impact Factor

Publication Stats

4k Citations
649.22 Total Impact Points

Institutions

  • 1995–2015
    • Universität Mannheim
      Mannheim, Baden-Württemberg, Germany
  • 2014
    • Deutsche Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e.V.
      Mannheim, Baden-Württemberg, Germany
  • 2009–2014
    • Universitätsmedizin Mannheim
      Mannheim, Baden-Württemberg, Germany
  • 1995–2014
    • Universität Heidelberg
      • • Faculty of Medicine Mannheim and Clinic Mannheim
      • • Institute of Hygiene
      Heidelburg, Baden-Württemberg, Germany
  • 2013
    • Technische Universität München
      München, Bavaria, Germany
  • 2012
    • HELIOS Klinikum Berlin-Buch
      Berlín, Berlin, Germany
  • 1997–2010
    • Westpfalz-Klinikum GmbH
      Kaiserlautern, Rheinland-Pfalz, Germany
  • 2000–2005
    • The Australian Society of Otolaryngology Head & Neck Surgery
      Evans Head, New South Wales, Australia
  • 1993
    • Technische Universität Kaiserslautern
      • Department of Physics
      Kaiserlautern, Rheinland-Pfalz, Germany
  • 1987
    • University of Hamburg
      Hamburg, Hamburg, Germany
  • 1979
    • Institut für Interdisziplinäre Medizin Hamburg
      Hamburg, Hamburg, Germany