Intravenous glutamine decreases lung and distal organ injury in an experimental model of abdominal sepsis

Introduction

The protective effect of glutamine, as a pharmacological agent against lung injury, has been reported in experimental sepsis; however, its efficacy at improving oxygenation and lung mechanics, attenuating diaphragm and distal organ injury has to be better elucidated. In the present study, we tested the hypothesis that a single early intravenous dose of glutamine was associated not only with the improvement of lung morpho-function, but also the reduction of the inflammatory process and epithelial cell apoptosis in kidney, liver, and intestine villi.

Methods

Seventy-two Wistar rats were randomly assigned into four groups. Sepsis was induced by cecal ligation and puncture surgery (CLP), while a sham operated group was used as control (C). One hour after surgery, C and CLP groups were further randomized into subgroups receiving intravenous saline (1 ml, SAL) or glutamine (0.75 g/kg, Gln). At 48 hours, animals were anesthetized, and the following parameters were measured: arterial oxygenation, pulmonary mechanics, and diaphragm, lung, kidney, liver, and small intestine villi histology. At 18 and 48 hours, Cytokine-Induced Neutrophil Chemoattractant (CINC)-1, interleukin (IL)-6 and 10 were quantified in bronchoalveolar and peritoneal lavage fluids (BALF and PLF, respectively).

Results

CLP induced: a) deterioration of lung mechanics and gas exchange; b) ultrastructural changes of lung parenchyma and diaphragm; and c) lung and distal organ epithelial cell apoptosis. Glutamine improved survival rate, oxygenation and lung mechanics, minimized pulmonary and diaphragmatic changes, attenuating lung and distal organ epithelial cell apoptosis. Glutamine increased IL-10 in peritoneal lavage fluid at 18 hours and bronchoalveolar lavage fluid at 48 hours, but decreased CINC-1 and IL-6 in BALF and PLF only at 18 hours.

Conclusions

In an experimental model of abdominal sepsis, a single intravenous dose of glutamine administered after sepsis induction may modulate the inflammatory process reducing not only the risk of lung injury, but also distal organ impairment. These results suggest that intravenous glutamine may be a potentially beneficial therapy for abdominal sepsis.     

An evaluation of lecturer practitioners in Ireland

Nursing continues to struggle to integrate the theoretical and clinical aspects of nurse education for the development of competent practitioners. Collaborative approaches to nurse education as well as the development of joint clinical-academic roles have had questionable success to date on merging the theoretical and clinical components of nursing. Lecturer practitioners' posts are new in Ireland. These posts were created as nurse educators were cognizant of the need for students to integrate theory to practice. The aim of the lecturer practitioner role was to increase the support forstudent nurses in both academia and practice. An evaluation of the impact of the lecturer practitioner role from three key perspectives was conducted in three Irish teaching hospitals in 2007. The results of this study suggest that as lecturer practitioners have both a clinical and academic remit they can integrate theory to practice through collaborative practice.     

Impact of the palliative care clinical nurse specialist on patients and relatives: a stakeholder evaluation

Within the last decade, there has been a rapid expansion in the United Kingdom of clinical nurse specialists (CNSs), yet there has been limited evidence of their effectiveness. The clinical area of palliative care has one of the largest numbers of CNSs which has particularly started to escalate in the acute hospital setting. Following the Calman-Hine Report and the more recent NHS Cancer Plan, it is anticipated that the number of CNSs in palliative and cancer care is likely to grow. In light of the current policy emphasis of Clinical Governance and Clinical Effectiveness, there is an urgent need to demonstrate the contribution that CNSs make. This paper presents the qualitative findings of an evaluation study on the impact of the CNS within a palliative care team in a large acute hospital in the North-West of England. A stakeholder evaluation that encompassed tape-recorded semi-structured interviews to explore how the stakeholders saw the impact of the CNS within palliative care was performed. Twenty-seven interviews were conducted with stakeholders across the hospital setting including senior nurses, consultants, junior doctors and nurses representing the different grades. Data were analysed for emerging themes utilizing a case and cross-case analysis. The results indicated that the CNSs within palliative care in an acute hospital are seen to be potentially beneficial for both patients and relatives. This paper will focus on exploring these perceived benefits, which included symptom control, psychological care and being an advocate for patients and relatives.     

Heparin oligosaccharides bind L- and P-selectin and inhibit acute inflammation

Initial attachment of leukocytes to the vessel wall at sites of inflammation is supported by a family of carbohydrate-binding adhesion molecules called the selectins. Selectin ligands include sialyl-Lewis x (sLex, Neu5Ac alpha 2-3Gal beta 1-4[Fuc alpha 1-3]GlcNAc--) and related structures. We report here that defined heparin oligosaccharides interact with the selectins. Heparin chains containing four or more monosaccharide residues inhibited the function of L- and P-selectin, but not E-selectin, in vitro. In a competition enzyme-linked immunosorbent assay measuring inhibition of solution-phase selectin-Ig fusion proteins (selectin-Ig) binding to immobilized bovine serum albumin-sLex neoglycoprotein, a heparin-derived tetrasaccharide mixture inhibited 50% of L- and P-selectin-Ig binding (IC50) at 200 +/- 40 mumol/L and 850 +/- 110 mumol/L, respectively. A single hexasulfated tetrasaccharide (delta UA2S alpha 1-4GlcNS6S alpha 1-4IdoA2S alpha 1- 4GlcNS6S) was particularly active against L- and P-selectin-Ig (IC50 = 46 +/- 5 mumol/L and 341 +/- 24 mumol/L). By comparison, the tetrasaccharide sLex was not inhibitory at concentrations up to 1 mmol/L. In cell adhesion assays, heparin tetrasaccharides reduced binding of neutrophils to COS cells expressing P-selectin but not to COS cells expressing E-selectin. They also blocked colon cancer cell adhesion to L- and P-selectin but not E-selectin. In a model of acute inflammation, intravenously administered heparin tetrasaccharides diminished influx of neutrophils into the peritoneal cavities of thioglycollate-treated mice. We conclude that heparin oligosaccharides, including non-anticoagulant tetrasaccharides, are effective L- and P- selectin inhibitors in vitro and have anti-inflammatory activity in vivo.     

Clinical study of integrated traditional and wester nmedicinein hepatolenticular degeneration

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Spondylometaphyseal dysplasia, corner fracture type: a heritable condition associated with coxa vara

The authors present the radiographic features of a previously incompletely delineated bone dysplasia, which they call spondylometaphyseal dysplasia, corner fracture type. This is a dominant heritable condition associated with short stature and developmental coxa vara. The progressive hip deformity usually causes significant disability requiring surgical correction. Developmental coxa vara, simulated corner fractures of long tubular bones, and vertebral body abnormalities result in a diagnostic constellation. Knowledge of these distinctive radiologic features allows accurate diagnosis, which in turn should lead to appropriate genetic counseling and possibly to earlier, more efficacious surgical treatment of the coxa vara.     

The Kheda malaria project: the case for environmental control

The Kheda project experience has shown that bio-environmentalcontrol of malaria is feasible, cost effective and ecologicallysound. It clearly brings out the need to consider health issuesat the planning stage of all developments. Bio-environmentalcontrol of malaria is suggested as the first line of attackfor the control of mosquitoes, malaria and other mosquito-bornediseases. Insecticides may be reserved for short-term use. Thiswill enable judicious and selective use of insecticides in solelyepidemic situations. The growing problem of resistance to insecticidesin mosquitoes as well as environmental pollution, can then besolved on a long term basis.     

Nurse socialization: issues and problems

A comparative study was conducted of the professional socialization process of student nurses in three nurse education centres in South Wales. Patterns and problem areas can be identified of relevance to issues in role theory and with practical implications for the more effective implementation of Project 2000. Three cohorts of students were interviewed using a semi-structured interview schedule whilst in the introductory block and at the end of the first year. The teaching and ward staff directly involved in the socialization process were also interviewed so that their views could be compared with those of the students. There were differences between the types of ward in the opportunities they offered for role modelling. It was doubtful whether the three categories of students, teaching staff and ward staff were all employing a single conception of 'the good nurse'. The student has to find her own pathway through the divergent and often conflicting values and philosophies of the teaching staff and those in authority on the wards. It is recommended that a more unified approach be adopted to reduce the conflict which learners experience. In accordance with Project 2000, the teaching staff should act as practitioners and thereby be perceived as a professional role model with clinical credibility.