Histological assessment of intermediate- and long-term creatine monohydrate supplementation in mice and rats

Creatine monohydrate (CrM) supplementation appears to be relatively safe based on data from short-term and intermediate-term human studies and results from several therapeutic trials. The purpose of the current study was to characterize pathological changes after intermediate-term and long-term CrM supplementation in mice [healthy control and SOD1 (G93A) transgenic] and rats (prednisolone and nonprednisolone treated). Histological assessment (18-20 organs/tissues) was performed on G93A mice after 159 days, and in Sprague-Dawley rats after 365 days, of CrM supplementation (2% wt/wt) compared with control feed. Liver histology was also evaluated in CD-1 mice after 300 days of low-dose CrM supplementation (0.025 and 0.05 g x kg-1x day-1) and in Sprague-Dawley rats after 52 days of CrM supplementation (2% wt/wt) with and without prednisolone. Areas of hepatitis were observed in the livers of the CrM-supplemented G93A mice (P < 0.05), with no significant inflammatory lesions in any of the other 18-20 tissues/organs that were evaluated. The CD-1 mice also showed significant hepatic inflammatory lesions (P < 0.05), yet there was no negative effect of CrM on liver histology in the Sprague-Dawley rats after intermediate-term or long-term supplementation nor was inflammation seen in any other tissues/organs (P = not significant). Dietary CrM supplementation can induce inflammatory changes in the liver of mice, but not rats. The observed inflammatory changes in the murine liver must be considered in the evaluation of hepatic metabolism in CrM-supplemented mice. Species differences must be considered in the evaluation of toxicological and physiological studies.

Creatine supplementation and riluzole treatment provide similar beneficial effects in copper, zinc superoxide dismutase (G93A) transgenic mice

This study investigated the effects of riluzole (Ril), creatine (Cr) and a combination of these treatments on the onset and progression of clinical signs and neuropathology in an animal model of familial amyotrophic lateral sclerosis, the G93A transgenic mouse (n=13-17 per group). The onset of clinical signs was delayed (P<0.05) by about 12 days in all treatment groups compared with control; however, no differences occurred between treatments. All animals were killed at 199 days of age. At the end of the experimental period the severity of clinical signs was less (P<0.05) with all treatments compared with control. Again no differences between treatments were observed. The treatments had no effect on the number of neurons in ventral horns of the lumbar region of the spinal cord. Transgenic mice ingesting Cr displayed elevated (P<0.05) total Cr levels in cerebral hemispheres (5%) and spinal cord (8%), but not skeletal muscles. These data demonstrate that treatment with Ril and Cr were both effective in delaying disease onset and clinical disability. To the age of killing, no additional benefit was conferred by co-administration of Ril and Cr.

Genetic mapping of a new Lafora progressive myoclonus epilepsy locus (EPM2B) on 6p22

BACKGROUND

Lafora disease is a progressive myoclonus epilepsy with polyglucosan accumulations and a peculiar neurodegeneration with generalised organellar disintegration. It causes severe seizures, leading to dementia and eventually death in early adulthood.

METHODS

One Lafora disease gene, EPM2A, has been identified on chromosome 6q24. Locus heterogeneity led us to search for a second gene using a genome wide linkage scan in French-Canadian families.

RESULTS

We mapped a second Lafora disease locus, EPM2B, to a 2.2 Mb region at 6p22, a region known to code for several proteins, including kinesins. Kinesins are microtubule dependent motor proteins that are involved in transporting cellular components. In neurones, they play a major role in axonal and dendritic transport.

CONCLUSION

Analysis of the present locus in other non-EPM2A families will reveal whether there is further locus heterogeneity. Identification of the disease gene will be of major importance towards our understanding of the pathogenesis of Lafora disease.

Heparan sulphate sulphotransferase expression in mice and Caenorhabditis elegans

Heparan sulphate (HS) acts as a multifunctional cell regulator, with specific sulphated saccharide sequences designed for selective interactions with many proteins. Functionally, these interactions result in regulation of the protein activities, and there is growing evidence that cells can dynamically alter the structure of HS sequences that they display. HS biosynthesis involves the action of a complex set of enzymes with polymerase, epimerase and sulphotransferase (ST) activities. In higher organisms, multiple isoforms of STs decorate the nascent HS chains with specific patterns of sulphation that confer selective biological functions. The study of HSSTs in model organisms provides a valuable opportunity to examine the expression of these enzymes in relation to the structure and activities of the HS produced. Here we describe that, in mice, there are stage-specific combinations of HSST isoenzymes that underlie the synthesis of different HS species at different times in the developing brain. This differential expression of HSSTs results in the synthesis of structurally variant HS species that form functional signalling complexes with specific fibroblast growth factors and their receptors. Regulated synthesis of specific HS species could be a mechanism for the regulation of proliferation and differentiation in the developing brain. We also describe evidence that a Caenorhabditis elegans orthologue of the mammalian 2OST enzyme, called HST-2, is essential for the normal development of this nematode. Together, these studies emphasize the importance of HSSTs in the biosynthesis of functionally variant HS proteoglycans, and demonstrate the importance of these complex regulatory molecules in developmental processes.

Lasting impact in families after death from ALS

INTRODUCTION

ALS severely affects families, who have to cope after the patient's death. There is no information on ongoing needs or concerns of families surviving the death of the ALS patient. We wished to survey these needs.

METHOD

We developed a written questionnaire which we distributed at a single point in time to 32 patients' families. All patients had been followed in the McMaster University ALS clinic, and had died months to years earlier from ALS.

RESULTS

The response rate was excellent (85%). ALS caused lasting emotional and financial hardship in families, and 37% of respondents felt they were coping poorly, sometimes years after the patient's death. This did not clearly relate to the bereavement period, nor to the physical or financial impact of the disease during life. In most cases the disease led to a strengthening of family ties. However, 15% of chief caregivers felt blamed by in-laws for contributing to the death of the patient; in these cases family ties weakened. Less than half of families were still receiving ALS information, although 75% still wished to. About two-thirds of families had ongoing questions about the disease, and a small number remained concerned that they, or their children, would develop the disease. Only a third of families were actively involved in ongoing fund-raising activities.

CONCLUSIONS

It is possible to survey ongoing family needs after the death of the ALS patient. ALS causes lasting impact in surviving family members. There are ongoing needs that could be met by ALS clinics, ALS organizations, and healthcare systems, and opportunities for greater involvement of family members in volunteer activities, awareness, and fundraising. Generalization across other healthcare systems, and comparison with other disease states, could be important.

Dynamic biosynthesis of heparan sulphate sequences in developing mouse brain: a potential regulatory mechanism during development

Over recent years our understanding of the functions of the heparan sulphate (HS) family of complex polysaccharides has shifted dramatically. Once seen as simply structural scaffolding in the extracellular matrix, they are now viewed as critical players in the regulatory network of cells. They are strategically located at the cell surface and in the extracellular matrix, and there has been an increasing realization that specific sequences in the HS chains are designed for selective interactions with many proteins. Functionally, these interactions result in regulation of the protein activities. It is becoming clear that HS functions as a new class of multifunctional cell regulator. There is also growing evidence that cells can dynamically alter the structure of HS sequences that they express. Here we review recent developments and describe evidence for regulated changes in the synthesis and structure of HS chains expressed during early mouse brain development. The data suggest a new concept in which dynamic changes in biosynthesis of different HS sequences create distinct cellular HS repertoires, the heparanome. Their expression, in specific spatio-temporal patterns, is likely to endow organisms with novel regulatory mechanisms for controlling the activity of specific HS-binding proteins.

Specialist practice for UK community mental health nurses: the 1998--99 survey of course leaders

Surveys of the leaders of the UK's post-qualifying education courses for community mental health nurses have taken place, on an annual basis, for over 10 years. In this paper, findings from the survey undertaken in the 1998--99 academic year are reported. These findings include: that most course leaders do not personally engage in clinical practice; that interprofessional education takes place at a minority of course centres, and that course philosophies and aims are characterised by an emphasis on both outcomes (in terms of, for example, skills acquisition, knowledge development and the ability to engage in reflective practice), and process (adult learning).

Heparan sulfate: decoding a dynamic multifunctional cell regulator

The heparan sulfates are a family of cell-surface and matrix polysaccharides with an incredible degree of structural diversity that are distributed widely in virtually all metazoan organisms. Recent genetic, biochemical and cell-biological studies have led to increased understanding of the biosynthetic mechanisms that produce these complex molecules, as well as their functional versatility in regulating protein activities. The dynamic expression of heparan sulfates with differing sugar sequences suggests a new concept in which the repertoire of sequences produced by a particular cell or tissue is designated its 'heparanome'. This review discusses recent developments and surveys emerging experimental strategies that hold promise for revealing the functional specificity and mechanisms of action of heparan sulfates as multifunctional cell regulators.

Beneficial effect of ginseng root in SOD-1 (G93A) transgenic mice

Many patients with amyotrophic lateral sclerosis (ALS; motor neuron disease) use natural or traditional therapies of unproven benefit. One such therapy is ginseng root. However, in some other disease models, ginseng has proven efficacious. Ginseng improves learning and memory in rats, and reduces neuronal death following transient cerebral ischemia. These effects of ginseng have been related to increases in the expression of nerve growth factor and its high affinity receptor in the rat brain, and antioxidant actions, inter alia. Since such actions could be beneficial in ALS as well, we studied the effect of ginseng (Panax quinquefolium), 40 and 80 mg/Kg, in B6SJL-TgN(SOD1-G93A)1Gur transgenic mice. The ginseng was given in drinking water, from age 30d onwards. We measured the time to onset of signs of motor impairment, and survival. There was no difference between the two ginseng groups (n=6, 6) in either measure. However, compared to controls (n=13), there was a prolongation in onset of signs (116d vs. 94d, P<0.001), and survival (139d vs. 132d, P<0.05). These experiments lend support to the use of ginseng root in ALS. Future experiments using this model could examine for symptomatic effects of ginseng, measure the effect of specific ginsenosides (which differ between ginseng species), and elucidate their mechanisms of action.

Sequencing of 3-O sulfate containing heparin decasaccharides with a partial antithrombin III binding site

Heparin- and heparan sulfate-like glycosaminoglycans (HLGAGs) represent an important class of molecules that interact with and modulate the activity of growth factors, enzymes, and morphogens. Of the many biological functions for this class of molecules, one of its most important functions is its interaction with antithrombin III (AT-III). AT-III binding to a specific heparin pentasaccharide sequence, containing an unusual 3-O sulfate on a N-sulfated, 6-O sulfated glucosamine, increases 1,000-fold AT-III's ability to inhibit specific proteases in the coagulation cascade. In this manner, HLGAGs play an important biological and pharmacological role in the modulation of blood clotting. Recently, a sequencing methodology was developed to further structure-function relationships of this important class of molecules. This methodology combines a property-encoded nomenclature scheme to handle the large information content (properties) of HLGAGs, with matrix-assisted laser desorption ionization MS and enzymatic and chemical degradation as experimental constraints to rapidly sequence picomole quantities of HLGAG oligosaccharides. Using the above property-encoded nomenclature-matrix-assisted laser desorption ionization approach, we found that the sequence of the decasaccharide used in this study is DeltaU(2S)H(NS,6S)I(2S)H(NS, 6S)I(2S)H(NS,6S)IH(NAc,6S)GH(NS,3S,6S) (+/-DDD4-7). We confirmed our results by using integral glycan sequencing and one-dimensional proton NMR. Furthermore, we show that this approach is flexible and is able to derive sequence information on an oligosaccharide mixture. Thus, this methodology will make possible both the analysis of other unusual sequences in HLGAGs with important biological activity as well as provide the basis for the structural analysis of these pharamacologically important group of heparin/heparan sulfates.

Negotiating the boundaries: the experience of the mental health nurse at the interface with the criminal justice system

Community mental health nurses working within the criminal justice system undertake an important function with regard to the strategic intent that wherever possible, mentally disordered persons should receive care and treatment from health and social services. Their precise role, and the particular function of court diversion/assessment schemes, is still being defined. This takes place within a broader context of reorientation of mental health nursing within the move to community care and exposure to the complexity of multidisciplinary working. Examining the experience of mental health nurses in court diversion schemes reveals the intensity of the experience of working in an inter-professional setting without the benefit of preparation or training, and without the frame of reference of a structured health environment. Adaptation of the language of mental health nursing was necessary to effect mutual understanding with other professional groups, and there was a recognition that the competences needed to operate in this environment had not previously been identified as part of their skills base. The result was to bring into question their professional practice and identity as mental health nurses. The handling of patient information in the context of an inter-professional setting remains an issue requiring clarification.

Clinical work sampling A new approach to the problem of in-training evaluation

OBJECTIVE

Existing systems of in-training evaluation (ITE) have been criticized as being unreliable and invalid methods for assessing student performance during clinical education. The purpose of this study was to assess the feasibility, reliability, and validity of a clinical work sampling (CWS) approach to ITE. This approach focused on the following: (1) basing performance data on observed behaviors, (2) using multiple observers and occasions, (3) recording data at the time of performance, and (4) allowing for a feasible system to receive feedback.

PARTICIPANTS

Sixty-two third-year University of Ottawa students were assessed during their 8-week internal medicine inpatient experience.

MEASUREMENTS AND MAIN RESULTS

Four performance rating forms (Admission Rating Form, Ward Rating Form, Multidisciplinary Team Rating Form, and Patient's Rating Form) were introduced to document student performance. Voluntary participation rates were variable (12%-64%) with patients excluded from the analysis because of low response rate (12%). The mean number of evaluations per student per rotation (19) exceeded the number of evaluations needed to achieve sufficient reliability. Reliability coefficients were high for the Ward Form (.86) and the Admission Form (.73) but not for the Multidisciplinary Team (.22) Form. There was an examiner effect (rater leniency), but this was small relative to real differences between students. Correlations between the Ward Form and the Admission Form were high (.47), while those with the Multidisciplinary Team Form were lower (.37 and .26, respectively). The CWS approach ITE was considered to be content valid by expert judges.

CONCLUSIONS

The collection of ongoing performance data was reasonably feasible, reliable, and valid.

Manganese superoxide dismutase levels are elevated in a proportion of amyotrophic lateral sclerosis patient cell lines

The most frequent genetic causes of amyotrophic lateral sclerosis (ALS) determined so far are mutations occurring in the gene for copper/zinc superoxide dismutase (CuZnSOD). The mechanism may involve inappropriate formation of hyroxyl radicals, peroxynitrite or malfunctioning of the SOD protein. We hypothesized that undiscovered genetic causes of sporadically occurring amyotrophic lateral sclerosis might be found in the mechanisms that create and destroy oxygen free radicals within the cell. After determining that there were no CuZnSOD mutations present, we measured superoxide production from mitochondria and manganese superoxide dismutase (MnSOD), glutathione peroxidase, NFkappaB, Bcl-2 and Bax by immunoblot. Of the ten sporadic patients we tested we found three patients with significantly increased concentrations of MnSOD. These patients also had lower levels of superoxide production from mitochondria and decreased expression of Bcl-2. No mutations were found in the cDNA sequence of either MnSOD in any of the sporadic patients. A patient with a CuZnSOD mutation (G82R) used as a positive control showed none of these abnormalities. The patients displaying the MnSOD aberrations showed no specific distinguishing features. This result suggests that the cause of ALS in a subgroup of ALS patients (30%) is genetic in origin and can be identified by these markers. The alteration in MnSOD and Bcl-2 are likely epiphenomena resulting from the primary genetic defect. It suggests also that the oxygen free radicals are part of the cause in this subgroup and that dysregulation of MnSOD or increased endogenous superoxide production might be responsible.

Cost analysis of nurse telephone consultation in out of hours primary care: evidence from a randomised controlled trial

OBJECTIVE

To undertake an economic evaluation of nurse telephone consultation using decision support software in comparison with usual general practice care provided by a general practice cooperative.

DESIGN

Cost analysis from an NHS perspective using stochastic data from a randomised controlled trial.

SETTING

General practice cooperative with 55 general practitioners serving 97 000 registered patients in Wiltshire, England.

SUBJECTS

All patients contacting the service, or about whom the service was contacted during the trial year (January 1997 to January 1998).

MAIN OUTCOME MEASURES

Costs and savings to the NHS during the trial year.

RESULTS

The cost of providing nurse telephone consultation was 81 237 pound sterling per annum. This, however, determined a 94 422 pound sterling reduction of other costs for the NHS arising from reduced emergency admissions to hospital. Using point estimates for savings, the cost analysis, combined with the analysis of outcomes, showed a dominance situation for the intervention over general practice cooperative care alone. If a larger improvement in outcomes is assumed (upper 95% confidence limit) NHS savings increase to 123 824 pound sterling per annum. Savings of only 3728 pound sterling would, however, arise in a scenario where lower 95% confidence limits for outcome differences were observed. To break even, the intervention would have needed to save 138 emergency hospital admissions per year, around 90% of the effect achieved in the trial. Additional savings of 16 928 pound sterling for general practice arose from reduced travel to visit patients at home and fewer surgery appointments within three days of a call.

CONCLUSIONS

Nurse telephone consultation in out of hours primary care may reduce NHS costs in the long term by reducing demand for emergency admission to hospital. General practitioners currently bear most of the cost of nurse telephone consultation and benefit least from the savings associated with it. This indicates that the service produces benefits in terms of service quality, which are beyond the reach of this cost analysis.

Results of remedial continuing medical education in dyscompetent physicians

PURPOSE

Noticing that moderately to severely incompetent physicians (as measured by a standardized assessment of physician competence) did not improve after traditional remedial continuing medical education (CME), the authors investigated the effects of a polyvalent, intensive, prolonged educational intervention on five physicians' competence.

METHOD

The five physicians participated in a CME program that lasted three years and consisted of individualized review, ongoing small-group and evidence-based discussions, simulated patients and role playing, formal chart review, and peer review. At the end of the program, the physicians were reassessed.

RESULTS

Only one physician improved; another remained the same, and three deteriorated.

CONCLUSION

Successful remediation of severely incompetent physicians is uncertain at best, even with prolonged, intensive CME that incorporates modalities thought to be effective in changing physicians' behaviors. Alternative educational techniques may need to be developed for this select population. Conversely, there may be reasons that preclude improvement even with optimal techniques.

Cognitive difficulty in physicians

PURPOSE

Remediation of some incompetent physicians has proven difficult or impossible. The authors sought to determine whether physicians with impaired competency had neuropsychological impairment sufficient to explain their incompetence and their failure to improve with remedial continuing medical education (CME).

METHOD

During a one-year period, 1996-97, all 27 participants in the Physician Review Program (PREP) conducted at McMaster University, a physician competency assessment program, undertook a detailed neuropsychological screening battery.

RESULTS

Nearly all physicians assessed as competent also performed well on the neuropsychological testing. However, a significant number (about one third) of the physicians who performed poorly on the competency assessment had neuropsychological impairments sufficient to explain their poor performances. The difficulties were more marked in elderly physicians.

CONCLUSION

A significant minority of incompetent physicians have cognitive impairments sufficient to explain both their incompetence and, probably, their failure to improve with remedial CME. Testing physicians for these impairments is important: to detect and treat reversible conditions, to manage irreversible conditions that preclude successful educational intervention, and to facilitate compensation in this instance. Serious consideration should be given to the incorporation of neuropsychological screening in all intensive physician review programs.

Bench to bedside in medical education

In spite of the significant resources devoted to medical education at all levels, the study of educational process has received relatively little attention. Most studies of learning have been observational, with little reference to recent advances in the neurobiology of learning and memory. In this article, the author briefly reviews developments in our understanding of the neurobiology of learning and memory and suggests ways they could contribute to the future evolution of medical education.

Pulmonary echinococcosis (hydatidosis) in children: results of surgical treatment

From 1986-1996, 33 children with 49 pulmonary hydatid cysts underwent surgical treatment in Vienna and Istanbul. Cysts were unilateral in 28 and bilateral in 5 cases; unruptured cysts (URC) were diagnosed in 19 patients, and 14 children presented with ruptured cysts (RC). Ten patients had cysts in other organs (liver, spleen, central nervous system) in addition to pulmonary cysts. Diagnosis was primarily based on chest X-ray and computed tomography scan. In Austrian children, a new combination of serological tests was used successfully (71% positive). The standard surgical procedure was cystotomy followed by capitonnage. The main postoperative complications were fever and wound infection. There were two recurrences after a mean follow-up of 4.8 years, and one patient died because of multiple organ involvement. We conclude that the therapy of choice in pediatric pulmonary hydatidosis is complete surgical elimination of the cyst by cystotomy and capitonnage, whereas more extended resections should be avoided. Ideally, benzimidazole treatment should be combined with surgery. New serological tests can improve diagnostic accuracy.

Intuition in nursing relationships: the result of 'skills' or 'qualities'?

Maintaining the scientific orientation of health and nursing care systems has resulted in a lack of focus on nurses' intuitive knowledge base. Consequently, confusion exists as to whether intuition in nursing is the result of acquired skills, or is dependent upon the inherent qualities of the individual. In deconstructing the apparently intuitive process of building rapport, neuro-linguistic programming (NLP) can offer insight, suggesting that rapport building depends on learnt skills that have moved into unconscious competence. The examination of nurses' intuitive knowledge, in order to identify underlying skills, needs to be just as rigorous as the acquisition of scientific knowledge. Examining intuitive knowledge can be achieved within a framework of reflective practice to counter the inherent dangers of an increasingly scientific approach operating within a caring profession.

Prevalence of cycle helmet use in children

A survey was conducted over a five-day period on a cohort of 234 families attending a busy regional children's out-patient department in the South West of England. A significant result of the survey was that parental use of helmets strongly correlated with the use of helmets by children. In addition, income was not found to be a major factor in cycle helmet ownership except in the lowest income band.