Osteoblasts with impaired spreading capacity benefit from the positive charges of plasma polymerised allylamine.

Bone diseases such as osteoporosis, osteoarthritis and rheumatoid arthritis, impinge on the performance of orthopaedic implants by impairing bone regeneration. For this reason, the development of effective surface modifications supporting the ingrowth of implants in morbid bone tissue is essential. Our study is designed to elucidate if cells with restricted cell-function limiting adhesion processes benefit from plasma polymer deposition on titanium. We used the actin filament disrupting agent cytochalasin D (CD) as an experimental model for cells with impaired actin cytoskeleton. Indeed, the cell's capacity to adhere and spread was drastically reduced due to shortened actin filaments and vinculin contacts that were smaller. The coating of titanium with a positively charged nanolayer of plasma polymerised allylamine (PPAAm) abrogated these disadvantages in cell adhesion and the CD-treated osteoblasts were able to spread significantly. Interestingly, PPAAm increased spreading by causing enhanced vinculin number and contact length, but without significantly reorganising actin filaments. PPAAm with the monomer allylamine was deposited in a microwave-excited low-pressure plasma-processing reactor. Cell physiology was monitored by flow cytometry and confocal laser scanning microscopy, and the length and number of actin filaments was quantified by mathematical image processing. We showed that biomaterial surface modification with PPAAm could be beneficial even for osteoblasts with impaired cytoskeleton components. These insights into in vitro conditions may be used for the evaluation of future strategies to design implants for morbid bone tissue.

[Criminal behavior and police records: self-reports from elderly individuals]. / Kriminelles Verhalten und polizeiliche Registrierung: Selbstberichte von Menschen im höheren Lebensalter.

As a consequence of demographic changes the crime rates of our society are increasingly influenced by the behavior of older age groups in the population. Hence, both the description and explanation of crime at advanced ages are gaining in importance. As almost no relevant self-report data are available, a regionally representative mail survey among 49 to 81-years-olds was conducted which gathered self-reports on criminal behavior, potentially explanatory variables and previous police records. Almost 50% of respondents reported that they had committed at least 1 out of 14 types of offences at least once since turning 50 years old. Younger cohorts were noticeably more crime prone than older ones, both at the present and in the past. Out of all offences asked about, driving under the influence of alcohol (DUI) was the primary behavior that showed up among the respondents. Apart from the DUI offence crime committed by the elderly is mainly characterized by fraud and property crimes in situations of everyday life by people who are well integrated and economically secure. Main predictors of criminal behavior at advanced ages are the individual sex and social learning mechanisms. The vast majority of people who have been repeatedly recorded by the police throughout their lives perpetuate criminal activities until higher ages. The proportion of offenders whose first police record took place after their 50(th) birthday is 56% which is much lower than estimates derived from official crime data.

[Antimicrobial resistance of Staphylococcus aureus and coagulase negative staphylococci isolated from mastitis milk samples from sheep and goats]. / Antibiotikaresistenz von Staphylococcus aureus und Koagulase-negativen Staphylokokken isoliert aus Mastitismilchproben von Schafen und Ziegen.

Staphylococcus aureus and coagulase negative staphylococci (CNS) were isolated from ovine and caprine mastitis milk samples originating from more than 40 Swiss farms. CNS dominated as causal microorganisms of mastitis in small ruminants. By restriction fragment length polymorphism (RFLP) analysis of the groEL gene and sequencing of 16S rDNA, various CNS species were identified, albeit certain of them predominated. For susceptibility testing of mastitis pathogens to selected antibiotics, minimal inhibitory concentrations were determined. Of the 67 S. aureus and 208 CNS strains, 31.3 % and 8.2 % were resistant to penicillin, 29.9 % and 1.0 % to ampicillin, 1.5 % and 10.6 % to erythromycin, and 3.0 % and 7.7 % to tetracycline, respectively. Moreover, 10 CNS strains (4.8 %) were resistant to oxacillin and one CNS strain to sulfamethoxazole/trimethoprim. The results obtained describe for the first time the resistance situation of mastitis pathogens from sheep and goats in Switzerland. However, accompanying and preventing measures are also of importance in mastitis control of small ruminants.

Stable fixation with absorbable sutures in craniofacial surgery.

The present study analyses the exclusive use of absorbable suture material (Vicryl(®), Ethicon, Germany) in the fixation of transposed bone segments in craniofacial surgery without modification of the osteotomy design. Among 129 children up to 24 months of age, osteosynthesis was conducted exclusively with Vicryl(®) sutures. The stability of postoperative results was evaluated and possible foreign body reactions were examined within the framework of clinical and radiological routine checks. All examined children exhibited stable postoperative conditions while the length of hospital stay was not affected. X-ray examinations of the skull in two planes demonstrated good bony union in all cases. Relevant foreign body reactions were not observed. The exclusive application of absorbable suture material enables stable and cost effective osteosynthesis. Significant foreign body reactions were not observed. The exclusive use of absorbable sutures did not alter the osteotomy design.

Clot lipids in ischaemic heart disease.

Total phospholipids (PL) and neutral lipid classes of plasma, of HDL and of clots produced from platelet-rich plasma and also the main coagulation parameters were determined in normal subjects and in patients with acute myocardial infarction (AMI) and with angiographically diagnosed coronary artery disease (CAD). The main plasma and HDL lipid fractions and the coagulation parameters did not differ significantly between the groups. In contrast, in both groups with ischaemic heart disease triglycerides (TG) bound to clots were selectively elevated precluding accidental trapping of lipoproteins in the fibrin network and suggesting an increased binding of TG-rich lipoproteins to clots. These changes in the quantity and quality of platelet-rich clots, resembling platelet-rich thrombi in vivo, might not only increase the volume of the clots, but also inhibit fibrinolytic enzymes from reaching their substrate. This might be significant in the pathogenesis of ischaemic heart disease.

On the bioisosteric potential of diazines: diazine analogues of the combined thromboxane A2 receptor antagonist and synthetase inhibitor Ridogrel.

In this SAR study the bioisosteric potential of diazines in the field of combined antithrombotic thromboxane A2 synthetase inhibitors and receptor antagonists was investigated. In this context, two series of (E)- and (Z)-omega-[[(aryldiazinylmethylene)amino]oxy]alkanoic acids were synthesized of which pentanoic acid derivatives with a 2-pyrazinyl, 4-pyridazinyl, or 5-pyrimidinyl group were found to exhibit this dual activity, while 4-pyrimidinyl as well as 3-pyridazinyl analogues showed only receptor antagonistic activity and 2-pyrimidinyl congeners were inactive. In the series of diazine analogues of Ridogrel (1), replacement of the 3-pyridyl group by a 2-pyrazinyl, 4-pyridazinyl, or 5-pyrimidinyl moiety led to compounds that inhibit thromboxane A2 synthetase in gel-filtered human platelets comparable to 1 (IC50 of 0.006, 0.016, and 0.039 microM, respectively, versus 0.007 microM). Radioligand-binding studies with [3H]SQ 29,548 in washed human platelets revealed that these diazine analogues block the thromboxane A2 receptor with an IC50 of 11, 6.0, and 1.5 microM, respectively. This compares well with the IC50 = 1.7 microM of 1. Finally, testing of inhibition of collagen-induced platelet aggregation in human platelet aggregation in human platelet-rich plasma with 2-pyrazinyl, 4-pyridazinyl, or 5-pyrimidinyl congeners of Ridogrel indicated that these heteroaromatic moieties may serve as bioisosteric substitutes of a 3-pyridyl group in dual-acting antiplatelet agents.

[The pattern of phospholipids during the course of delirium tremens (author's transl)]. / Das Verhalten der Phospholipide während des Delirium tremens

Plasma phospholipids were examined in patients with delirium tremens in the acute phase of the disease and after recovery. The levels of lysolecithin, phosphatidylinositol, phosphatidylethanolamine, sphingomyelin and the total of phospholipids were decreased in comparison to normals. Phosphatidylethanolamine, phosphatidylinositol and the total phospholipids were diminished in comparison to patients with liver cirrhoses. Only in the plasma of patients with liver cirrhoses with bad prognosis (hepatic coma) similar low levels of total phospholipids were found. It is concluded from these results, that the synthesis of phospholipids is reduced during delirium tremens.

A method of testing platelet aggregation in native whole blood.

A method of testing collagen induced platelet aggregation and ATP release in native (= non anticoagulated) whole blood by monitoring the electrical impedance in the Chrono Log Whole Blood Aggregometer is reported. It is the first simple method by which aggregation of human platelets can be measured in their natural environment. In normal individuals lower threshold collagen concentrations could induce platelet aggregation as determined with this method than in the other tested methods (impedance method with citrated blood, optical method in platelet rich plasma). The aggregation response was not inhibited by hirudin or heparin in therapeutic dose. The luminescence channel of the Whole Blood Aggregometer permits measurements of ATP release in native whole blood.

Sex-related differences in platelet aggregation in native whole blood.

To clarify discrepant reports about sex-related differences platelet aggregation (PA) was tested by a new impedance method in native whole blood (NWB) and compared to the results of citrated whole blood (CWB) and the turbidometric method (TM). In NWB collagen or ADP-induced PA was stronger in women than men similar to the TM indicating that this is not or not only caused by citrate. With collagen this difference persisted after ingestion of 125 mg acetylsalicylic acid (ASA) which might in part explain the greater therapeutic benefit of ASA for men. The results exclude haematocrit or platelet count as a cause of the differences of PA between women and men. Sodium arachidonate (NaAA)-induced PA was inhibited by 125 mg ASA in all tested methods; since inhibition of ADP-induced PA was not observed in NWB or CWB and the impedance methods failed to show a second wave of ADP-induced PA the significance of the second wave appears doubtful. The impedance method of NWB was found to be more sensitive to collagen, ADP or NaAA than the impedance method of CWB and to collagen or NaAA more sensitive than the TM. The impedance methods in NWB or CWB are not suited to test epinephrine-induced PA.

Cost-effectiveness analysis of a brief intervention delivered to problem drinkers presenting at an inner-city hospital emergency department.

OBJECTIVE: Alcohol screening and brief intervention (SBI) has gained widespread acceptance as an effective method for reducing problem drinking in at-risk populations. This study examines the cost and cost-effectiveness of an SBI pilot program delivered in an inner-city hospital emergency department (ED) to a traditionally underserved population. METHOD: A total of 1,036 subjects were screened for problem drinking during their visit to an ED. Eligible participants (N = 294) were randomly assigned to either a brief intervention group or a control group. As the result of attrition, a final sample of 194 (90 brief intervention; 104 control) participants remained at follow-up. The intervention consisted of a brief counseling session and a health information packet. The control group received only the packet. Intervention cost data were collected and analyzed using the Drug Abuse Treatment Cost Analysis Program. Selected outcomes at the 3-month follow-up included the raw Alcohol Use Disorders Identification Test score, average weekly number of drinks and engaging in heavy drinking in the past month (>6 drinks on one occasion for men, >4 for women). Outcome differences between the intervention and control groups were estimated with both bivariate and multivariate techniques. RESULTS: The average economic cost of the brief intervention was dollars 632 per subject, of which screening (dollars 497) was the largest component. In all cases, intervention subjects had better 3-month outcomes than control subjects, but the differences were not always statistically significant. Cost-effectiveness ratios were relatively small for all three outcomes, suggesting this type of intervention has the potential to be cost-effective under full implementation. CONCLUSIONS: The preliminary results demonstrate the potential advantage of further research in this area with larger samples and a longer follow-up period.

[Postoperative fructose infusion in a case of presumed hereditary fructose intolerance (author's transl)]. / Postoperative Fruktoseinfusion bei wahrscheinlich hereditärer Fruktoseintoleranz.

Hereditary fructose intolerance (HFI) was diagnosed in a 61 year-old male patient on account of liver dysfunction followed by prolonged shock immediately after the administration of a fructose and lactose infusion postoperatively. The diagnosis of HFI was based on an increased value of fructose, hypoglycaemia, lactic acidosis and diminution of the phosphate level in combination with the typical family history. The patient's children showed a normal reaction to fructose administration. The therapy included glucose, insulin and heparin administration, balance of acidosis and partial exchange of blood, which resulted in improvement in the glucose level, coagulation factors and acidosis, but could not prevent further liver damage and uraemia with a fatal outcome.

Head orthesis therapy in infants with unilateral positional plagiocephaly: an interdisciplinary approach to broadening the range of orthodontic treatment.

OBJECTIVE: Unilateral positional plagiocephaly is the most common deformity of the head in infants. As part of a prospective controlled clinical study, the pathomorphology of the positional plagiocephaly in early infancy was examined. The goal was to use noninvasive three-dimensional (3D) imaging to generate, for the first time ever, a standard database of infants without head deformities, to quantify the asymmetry of the positional plagiocephaly, and to evaluate the effectiveness of functional growth control using head orthesis. PATIENTS AND METHODS: In the present study, 3D soft-tissue data of the entire head were collected from a total of 40 infants: 20 with positional plagiocephaly (6.0 ± 0.97 months) and 20 infants without a head deformity (6.4 ± 0.3 months). Functional growth was controlled using a custom-made head orthesis. To evaluate the therapy, pre- and posttherapeutic scans were evaluated in three dimensions. RESULTS: Compared with the control group, infants with positional plagiocephaly demonstrated a reduced maximum length of the head, an increased head height, a shift in the ear axis as well as asymmetric anterior and posterior volumes of the neurocranium in lateral comparisons. Therapy using head orthesis led to a significant improvement of the asymmetry, with a reduction of the diagonal difference and an adjustment of the posterior volumes. CONCLUSION: Conservative growth control of extrinsically deformed infant skulls represents an interdisciplinary medical expansion of the orthodontic therapeutic spectrum. To prevent potential effects of positional plagiocephaly on the viscerocranium, head orthesis therapy is advisable in infancy.