[Regression of idiopathic epiretinal membrane-Case report and consideration of the possible mechanism]. / Regression einer idiopathischen epiretinalen Gliose ­ Kasuistik und Überlegungen zum Mechanismus.

In the presence of a symptomatic epiretinal gliosis, pars plana vitrectomy with membrane peeling to remove the membrane is usually indicated in clinical practice. According to common clinical experience, almost no independent regression of such an epiretinal membrane and thus healing of the pathology alone exists. Therefore, the unusual case of bilateral independent regression of idiopathic epiretinal gliosis and formation of a lamellar macular hole in a 73-year-old male patient is described. Considerations of the possible mechanism are presented based on the existing literature. These include separation of inflammatory versus noninflammatory membranes, possible separation of individual layers depending on the status of the posterior vitreous limiting membrane and also the possible action of proteolytic systems in the posterior vitreous region. Finally, the question arises, whether patients have to be informed about this fact before possible surgery.

[The interdisciplinary orthogeriatric ward round : Recommendations for the clinical routine]. / Die interdisziplinäre alterstraumatologische Visite : Empfehlungen für den Klinikalltag.

BACKGROUND: An orthogeriatric co-management can improve the quality of care for geriatric trauma patients. OBJECTIVE: The aim of this study was the establishment of treatment recommendations for the clinical routine in order to improve the quality of care for geriatric trauma patients. MATERIAL AND METHODS: Over a period of 7 months, 226 patients were discussed and visited once a week on 29 defined days, taking into account current laboratory results, vital signs, the medication as well as the clinical assessment by the nursing personnel. Besides physicians of different medical specialties (trauma surgery, geriatrics, clinical pharmacology, microbiology), members of the nursing staff and case managers took part in the ward rounds. RESULTS: On average, three treatment recommendations were made per patient visit (two pharmacological and one non-pharmacological recommendation [e.g. concerning fluid and delirium management]). The pharmacological and non-pharmacological recommendations were divided into several subcategories. The most frequent pharmacological recommendation was the discontinuation of a drug (30.4% of all pharmacological recommendations). CONCLUSION: The pharmacotherapy of geriatric patients requires careful consideration of contraindications, adverse drug reactions, duplicate medications, circadian aspects, and renal function. Regular re-evaluation of medical equipment can prevent catheter-associated infections. Identification and management of postoperative delirium is an integral component of the interdisciplinary orthogeriatric ward round. Evaluation of anti-infective treatment regimens with the expertise of a microbiologist/infectiologist proved to be very beneficial.

[DGRh recommendations for the implementation of current security aspects in the NSAID treatment of musculoskeletal pain]. / DGRh-Empfehlungen zur Implementierung aktueller Sicherheitsaspekte in die NSAR-Therapie muskuloskelettaler Schmerzen.

NSAIDs exert their anti-inflammatory and analgesic effects by inhibition of COX­2, a key enzyme for proinflammatory prostanoid synthesis. Therapy with NSAIDs is limited by their typical gastrointestinal, cardiovascular and renal side effects, which are caused by inhibition of COX­1 (gastrointestinal toxicity), COX­2 (cardiovascular side effects) or both COX-isoenzymes (renal side effects). Appropriate prevention strategies should be employed in patients at risk. If gastrointestinal risk factors are present, co-administration of a proton pump inhibitor or misoprostol is recommended; in patients with cardiovascular risk, coxibs, diclofenac and high-dose ibuprofen should be avoided. Furthermore, drug interactions and contraindications should be considered. In patients with renal impairment (GFR < 30 ml/min) all NSAIDs must be avoided. Ulcer anamnesis is a contraindication for traditional NSAIDs. Preexisting cardio- or cerebrovascular diseases are contraindications for coxibs. Treatment decisions should be individually based with a continuous monitoring of the risk - benefit ratio and exploitation of non-pharmacological treatment options.

Effect of leukotriene inhibitors on evolution of experimental brain contusions.

AIMS: Leukotriene levels increase in cerebrospinal fluid (CSF) following controlled cortical impact (CCI) injury in rats. We investigated the impact of two different leukotriene inhibitors in the CCI model on CSF leukotriene levels, brain water content (BWC), brain swelling (BS) contusion size and cellular response. METHODS: 134 male Sprague Dawley rats were investigated at 4, 24 and 72 h after CCI for CSF leukotriene levels and BWC/BS, lesion size in T2-weighted magnetic resonance imaging and immunohistochemistry. Animals received vehicle, MK-886, an inhibitor of 5-lipoxygenase activating protein, or Boscari(®) , a mixture of boswellic acids, acting as competitive nonredox 5-lipoxygenase inhibitors before trauma and then every 8 h until sacrifice. RESULTS: The intracranial pressure (ICP) was unaffected by treatment. Boscari treatment reduced CSF leukotriene C4 increase by -45% at 4 h (P < 0.03) and increase of BWC and BS by 49% (P < 0.05) and -58% at 24 h. Treatment with both substances showed a reduction of lesion volume at 72 h by -21% (P < 0.01) in T(2) -weighted magnetic resonance imaging, which was reflected in a smaller lesion area determined from a NeuN labelled section (-17% to -20%, P < 0.05). Triple immunofluorescence and Fluoro-Jade B staining showed rarefaction of neurones, glia and vasculature in the contusion core, whereas in the pericontusional zone astro- and microglia were upregulated in the presence of dying neurones. Treatment resulted in an improved survival of NeuN labelled neurones in the pericontusional cortex (+15% to +20%, P < 0.05). CONCLUSIONS: Leukotriene inhibition should be further investigated as therapeutic option to counteract secondary growth of traumatic brain contusions and to possibly improve pericontusional neuronal survival.

[Placebo therapy. Analysis of extent and expectations in a tertiary referral center]. / Placebotherapie. Analyse von Umfang und Erwartung in einer Klinik der Maximalversorgung.

BACKGROUND: The dimensions of orally administered pharmacological placebos in routine clinical practice and the attitude of the clinical staff towards placebos are widely unknown. The aim of this report was to examine the frequency, indications and the intentions of placebo use at the Medical University of Hannover (MHH). METHODS: This study was performed as an anonymous cross-sectional written survey at the MHH. Quantitative data on placebo requests registered by the dispensary were obtained in advance. RESULTS: A total of 74% of respondents reported using placebos in clinical practice, including 53% of physicians and 88% of the nursing staff. Pain (76%) and insomnia (59%) were the most frequently reported reasons for administering placebos. Placebos were considered to be highly effective by 28.5% of physicians and 63.8% of the nursing staff. CONCLUSION: The effective use of pharmacological placebos appears to be an established component of the therapeutic options of a tertiary referral center. The placebo effect seems to contain remarkable potential. While the use of pharmacological placebos is ethically problematic within the clinical context, the improvement of caregiver-patient interactions and the utilization of positive suggestion could serve as an ideal adjunct to active therapy regimes.

Rare earth doped zinc oxide nanowires.

Zinc oxide (ZnO) nanowires were grown via thermal transport and subsequently doped with different concentrations of Tm, Yb, and Eu using ion implantation and post annealing. High ion fluences lead to morphology changes due to sputtering; however, freestanding nanowires become less damaged compared to those attached to substrates. No other phases like rare earth (RE) oxides were detected, no amorphization occurs in any sample, and homogeneous doping with the desired concentrations was achieved. Photoluminescence measurements demonstrate the optical activation of trivalent RE-elements and the emission of the characteristic intra-4f-luminescence of the respective RE atoms, which could be assigned according to the Dieke-diagram. An increasing RE concentration results into decreasing luminescence intensity caused by energy transfer mechanisms to non-radiative remaining implantation defect sites. Furthermore, low thermal quenching was observed due to the considerable wide band gap of ZnO.

Nanomaterial electronic structure investigation by valence electron energy loss spectroscopy - an example of doped ZnO nanowires.

The effects of doping (by ion implantation) on the electronic structure of ZnO nanowires, particularly on the defect states generation in the band gap of ZnO, are investigated using valence electron energy loss spectroscopy (VEELS) performed in a transmission electron microscope (TEM). The improved spectrum energy resolution via the introduction of a gun monochromator, together with the reduced intensity in the zero loss peak tail as realized by spectrum acquisition at non-zero momentum transfer, enable us to extract such electronic structure information from the very low loss region of the EEL spectra. We have compared the doping effects of several dopant elements, i.e., Er, Yb, and Co, and found that generation of the band tail states ( approximately 2-3.3eV) is a common consequence of the ion implantation process. On the other hand, specific mid-gap state(s) in the lower energy range are created only in the rare earth element doped ZnO nanowires, suggesting the dopant-sensitive nature of such state.

Effects of combined supplementation with B vitamins and antioxidants on plasma levels of asymmetric dimethylarginine (ADMA) in subjects with elevated risk for cardiovascular disease.

Elevated plasma asymmetric dimethylarginine (ADMA) concentrations have been suggested as a potential risk factor for cardiovascular disease (CVD). Studies indicate a linkage between hyperhomocysteinemia, oxidative stress and ADMA metabolism. We tested the hypothesis that combined supplementation of B vitamins and antioxidants reduces ADMA concentrations in subjects with at least two CVD risk factors. A total of 123 men and women (58+/-8.1 years) were randomly assigned to take either a preparation including B vitamins and antioxidants (verum) or placebo for 6 months in a double-blind design. Blood concentrations of ADMA, symmetric dimethylarginine (SDMA), L-arginine, B vitamins, total homocysteine (tHcy), alpha-tocopherol, antioxidant capacity (TEAC), and oxLDL were measured pre- and post-intervention. Treatment with verum significantly decreased tHcy (-2.14 micromol/L; P<0.001) and significantly increased TEAC values (+39.3 microM; P<0.022), but no effect on ADMA was observed. OxLDL was significantly reduced in verum (-7.3 U/L; P=0.001) and placebo (-9.2U/L; P<0.001). At baseline, significant correlations were found only between ADMA and SDMA (r=0.281; P=0.002), L-arginine/ADMA and SDMA (r=-0.294; P<0.001), L-arginine/ADMA and oxLDL (r=-0.281; P=0.016), and L-arginine/ADMA and age (r=-0.231; P=0.010). Our results indicate that combined supplementation of B vitamins and antioxidants is not an adequate strategy to reduce ADMA plasma levels in subjects with elevated CVD risk.

Effects of a cinnamon extract on plasma glucose, HbA, and serum lipids in diabetes mellitus type 2.

BACKGROUND: According to previous studies, cinnamon may have a positive effect on the glycaemic control and the lipid profile in patients with diabetes mellitus type 2. The aim of this trial was to determine whether an aqueous cinnamon purified extract improves glycated haemoglobin A1c (HbA1c), fasting plasma glucose, total cholesterol, low-density lipoprotein (LDL), high-density lipoprotein (HDL) and triacylglycerol concentrations in patients with type 2 diabetes. METHODS: A total of 79 patients with diagnosed diabetes mellitus type 2 not on insulin therapy but treated with oral antidiabetics or diet were randomly assigned to take either a cinnamon extract or a placebo capsule three times a day for 4 months in a double-blind study. The amount of aqueous cinnamon extract corresponded to 3 g of cinnamon powder per day. RESULTS: The mean absolute and percentage differences between the pre- and post-intervention fasting plasma glucose level of the cinnamon and placebo groups were significantly different. There was a significantly higher reduction in the cinnamon group (10.3%) than in the placebo group (3.4%). No significant intragroup or intergroup differences were observed regarding HbA1c, lipid profiles or differences between the pre- and postintervention levels of these variables. The decrease in plasma glucose correlated significantly with the baseline concentrations, indicating that subjects with a higher initial plasma glucose level may benefit more from cinnamon intake. No adverse effects were observed. CONCLUSIONS: The cinnamon extract seems to have a moderate effect in reducing fasting plasma glucose concentrations in diabetic patients with poor glycaemic control.

Catalyst-nanostructure interaction in the growth of 1-D ZnO nanostructures.

Vapor-liquid-solid is a well-established process in catalyst guided growth of 1-D nanostructures, i.e., nanobelts and nanowires. The catalyst particle is generally believed to be in the liquid state during growth, and is the site for impinging molecules. The crystalline structure of the catalyst may not have any influence on the structure of the grown nanostructures. In this work, using Au guided growth of ZnO, we show that the interfaces between the catalyst droplet and the nanostructure grow in well-defined mutual crystallographic relationships. The nanostructure defines the crystallographic orientation of the solidifying Au droplet. Possible alloy, intermetallic, or eutectic phase formation during catalysis are elucidated with the help of a proposed ternary Au-Zn-O phase diagram.

[Pharmacological treatment of osteoarthritis in the elderly]. / Medikamentöse Arthrosetherapie im Alter.

Osteoarthritis (OA) is the most common cause of functional disability in the elderly. Pain and loss of motion induce a vicious circle, leading to instability, frailty and ultimately invalidity. Currently, there is no treatment to reverse or slow the disease progression to a clinically meaningful extent. Thus, the primary goal of OA treatment in the elderly is pain relief and preservation of joint function. For this, pharmacological, non-pharmacological and if necessary surgical treatment regimes must form an integrated concept. However, the real challenge is polymorbidity and other age-related or age-associated factors, which influence the course of disease and its therapy unfavorably. The changes in pharmacokinetics and -dynamics in the elderly can be compensated for the nonopioid and opioid-analgesics by the well known "start low, go slow" approach. More problematic are non-steroidal anti-inflammatory drugs (NSAIDs), which are most often used for symptomatic treatment of OA: Patients over 65 have an enhanced susceptibility to the gastrointestinal and renal side effects of NSAIDs; all NSAIDs, not only coxibs, increase the cardiovascular risk in patients with such a disease; number and severity of drug interactions is elevated due to age-associated polypharmacy. Thus, NSAIDs, including coxibs, should be used with great caution for treatment of OA in the elderly.

The second generation of COX-2 inhibitors: clinical pharmacological point of view.

Valdecoxib, parecoxib, etoricoxib and lumiracoxib represent the second generation of selective COX-2 inhibitors. In comparison to the first generation, they show an at least equivalent efficacy in the treatment of pain and inflammation. However, the postulated gain of safety is yet difficult to determine and seems to be, if any, small.

Comparison of different activity parameters in atopic dermatitis: correlation with clinical scores.

BACKGROUND: Several laboratory markers have been described to correlate positively with disease activity of atopic dermatitis (AD). These include soluble adhesion molecules and eosinophil granular proteins. Although the correlation of these parameters with the severity and extent of skin involvement has been repeatedly studied in the past, no systematic investigation has been performed over a lengthy period of time. In addition, no subjective disease parameters recorded by the patient have been included in studies dealing with disease activity. OBJECTIVES: To assess the validity of different objective and subjective parameters [soluble E-selectin (sE-selectin), soluble vascular cell adhesion molecule-1 (sVCAM-1), eosinophil cationic protein (ECP), urinary nitrate excretion (reflecting endogenous nitric oxide formation) and the patients' impressions of pruritus, sleeplessness and skin status] as markers of AD disease activity. METHODS: Twenty patients were examined for 1 year and their skin status was evaluated by an established score (SCORAD). sE-selectin, sVCAM-1 and ECP were analysed by commercial test kits. Urinary nitrate concentration was measured by gas chromatography-mass spectrometry. The subjective parameters, pruritus, sleeplessness and impression of skin status, were recorded by the patients on a visual analogue scale. RESULTS: In this long-term trial, only sE-selectin and the subjective parameters showed a statistically significant correlation with the SCORAD score. CONCLUSIONS: Our data indicate that basic clinical scoring remains a most effective and relevant method of recording skin disease activity in AD.

Elevated nitric oxide levels in patients with chronic liver disease and cirrhosis correlate with disease stage and parameters of hyperdynamic circulation.

Chronic liver diseases are accompanied by changes in splanchnic and systemic circulation. These changes are characterised by a reduction in peripheral vascular resistance and an increased cardiac output at rest. An increased release of nitric oxide (NO) has been proposed to play a role in the pathogenesis of vasodilatation and vascular hypocontractility. This study was designed to determine the nitric oxide metabolism measured as circulating nitrate levels in serum/urine in patients with chronic liver disease and cirrhosis. The nitrate concentrations were significantly increased in advanced degrees in cirrhosis Child B and C, and normal or even reduced in patients with chronic active hepatitis and early cirrhosis. In our study the connections between the extent of portal hypertension and nitrate levels were evident. The presence of ascites as well as the the progression of oesophageal varices were associated with higher circulating nitrate levels. The connection between increased nitric oxide production and the haemodynamic sequelae of portal hypertension is also apparent in the significant correlation between plasma renin and serum nitrate levels. Circulating nitrate levels also correlated to the serum interleukin-6 levels. This study demonstrated that the increased nitric oxide metabolism is associated with the haemodynamic alterations induced by portal hypertension.

Knowledge on drug dosages of ward physicians.

OBJECTIVE: Dosing errors are a common source for preventable adverse drug events. This study evaluated the knowledge of German hospital physicians with respect to the daily dosage of frequently used drugs. METHODS: A questionnaire survey was carried out among 168 ward physicians from three university and four municipal hospital departments of internal medicine asking for the daily dosage of 17 frequently used drugs. RESULTS: One hundred twenty-seven of 168 physicians returned a completed questionnaire, a response rate of 75.6%. Only 50% of the dose estimates were within the therapeutic range. Even in cases of frequent prescription 7% of the stated doses were overdosed and 15% were underdosed. CONCLUSIONS: The results of this survey suggest that adverse drug events and the lack of therapeutic effect due to dosing errors could be prevented by an improved knowledge of daily dosages.

Effects of intravenous oxygen on prostacyclin and thromboxane formation in patients with peripheral occlusive arterial disease.

Oxygen infusion is used in complementary medicine for treatment of peripheral occlusive arterial disease. The mechanism of action is unknown. Thus, we determined the effects of oxygen infusion on prostacyclin, thromboxane and nitric oxide synthesis. Twelve patients with peripheral occlusive arterial disease received oxygen 40 ml/d intravenously for 3 weeks. Study parameters, analyzed by gas chromatography-mass spectrometry on day 1, 3, 10, 16, 21: 2,3-dinor-6-oxo-PGF(1alpha), colour invisible 2,3-dinor-TXB2 and nitrate in one-hour-urine before and after oxygen infusion, reflecting prostacyclin, thromboxane and nitric oxide synthesis. Urinary 8-iso-PGF2alpha, indicating oxidative stress, was assessed in one patient. Urinary 2,3-dinor-6-oxo-PGF1alpha rose from baseline more than 4-fold after oxygen infusion. In contrast, urinary 2,3-dinor-TXB2 excretion remained unchanged. Oxygen infusion had no effect on urinary nitrate excretion. Urinary 8-iso-PGF(2alpha) was not influenced by oxygen infusion with and without diclofenac pretreatment. Our data demonstrate a shift of the prostacyclin/thromboxane ratio toward prostacyclin by oxygen infusion. Thus, a mechanism of action is provided and clinical trials with intravenous oxygen find a rational basis.