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Biomedical subjects

A Deakin

Publications and source records attributed to A Deakin.

7 recordsLinked to original sources

An integrated framework for safety, quality and risk management: an information and incident management system based on a universal patient safety classification.

More needs to be done to improve safety and quality and to manage risks in health care. Existing processes are fragmented and there is no single comprehensive source of information about what goes wrong. An integrated framework for the management of safety, quality and risk is needed, with an information and incident management system based on a universal patient safety classification. The World Alliance for Patient Safety provides a platform for the development of a coherent approach; 43 desirable attributes for such an approach are discussed. An example of an incident management and information system serving a patient safety classification is presented, with a brief account of how and where it is currently used. Any such system is valueless unless it improves safety and quality. Quadruple-loop learning (personal, local, national and international) is proposed with examples of how an exemplar system has been successfully used at the various levels. There is currently an opportunity to "get it right" by international cooperation via the World Health Organization to develop an integrated framework incorporating systems that can accommodate information from all sources, manage and monitor things that go wrong, and allow the worldwide sharing of information and the dissemination of tools for the implementation of strategies which have been shown to work.

Australia↗

The generation and characterization of antagonist RNA aptamers to human oncostatin M.

Oncostatin M (OSM) is a multifunctional member of the interleukin-6 cytokine family. OSM has been implicated as a powerful proinflammatory mediator and may represent a potentially important, novel therapeutic opportunity for treatment of established rheumatoid arthritis. To further investigate the role of OSM in inflammatory disorders, we have isolated a series of RNA aptamers that bind specifically to human OSM. The highest affinity aptamer, designated ADR58, has been characterized in a series of in vitro and cell based assays. ADR58 has an affinity of 7 nm for human OSM, and it can antagonize OSM binding to the gp130 receptor and specifically antagonize OSM mediated signaling. The aptamer has been truncated in length to 33 bases, all pyrimidine positions are substituted with 2' fluorine, and 14 of 18 purine positions have been substituted with 2' O-methyl to increase stability toward nucleases. This truncated, modified form of ADR58 retains complete affinity and functional activity for OSM. This aptamer may be used as a tool to further investigate the role of OSM in inflammatory disorders and may also have role as a therapeutic agent.

Animals↗

Discovery of novel ansamycins possessing potent inhibitory activity in a cell-based oncostatin M signalling assay.

We describe the isolation and characterisation of novel non-benzoquinone ansamycin metabolites related to geldanamycin from a culture of Streptomyces sp. S6699. The compounds possess potent inhibitory activity in a cell-based assay measuring inhibition of oncostatin M signalling in a reporter cell line utilising a secreted placental alkaline phosphatase (sPAP) readout. In this paper we report the isolation and structure elucidation of the compounds and describe some of their biological properties.

Alkaline Phosphatase↗

An interdisciplinary approach to a day-long palliative care course for undergraduate students.

Although it is desirable that students in the health sciences be educated together to prepare them for interdisciplinary practice, many educational programs remain discipline specific. An undergraduate course in palliative care, originally designed for medical students at McMaster University, Hamilton, Ont., was expanded in 1993 to include students from various health sciences programs in the region. The course introduces students to the components of palliative care and its interdisciplinary nature in a problem-based way and directs students to additional educational resources. The authors describe the planning, content and evaluation of the course material. The observed decline in attendance by medical students, which coincided with the introduction of the interdisciplinary format, warrants further investigation. Future directions of the course are discussed.

Absenteeism↗

Measurement of naloxone in plasma using high-performance liquid chromatography with electrochemical detection.

A new sample preparation technique, solid-phase extraction employing the ion-pair reagent octyl sodium sulfate (OSS), was developed for the selective isolation of nanogram quantities of naloxone from human plasma. Plasma samples containing naloxone, OSS, buffer, and naltrexone (internal standard) were applied to octyldecylsilane (C18) cartridges, and the opiates were eluted with 100% methanol. An extraction efficiency of 90% was achieved. Extracts were then examined by reversed-phase high-performance liquid chromatography with electrochemical detection, with mobile phase composition adjusted to optimize separation and quantitation. An oxidizing potential of +0.93 V resulted in an assay sensitivity of 1.0 ng. Thus, plasma naloxone levels of ca. 20 ng/ml could be readily detected and quantified. The intra-assay coefficient of variation at plasma levels of 80 ng/ml was 7.2%. Plasma naloxone values obtained during a 5-h infusion of the drug (0.24 mg/min) in two normal human subjects were stable and reproducible. Thus, the method herein described is applicable to human studies employing naloxone infusion.

Chromatography, High Pressure Liquid↗

Naloxone increases water and electrolyte excretion after water loading in patients with cirrhosis and ascites.

Endogenous opioids may be involved in the pathogenesis of ascites and edema in patients with liver cirrhosis. We administered the opioid antagonist naloxone (5 mg bolus followed by a 0.06 mg/min infusion) to eight male patients with alcoholic cirrhosis and ascites and to five healthy age- and sex-matched control subjects and determined the effects of naloxone on water and electrolyte excretion after a nonsustained water load (20 ml/kg). In comparison with saline vehicle infusion carried out in the same subjects, naloxone administration resulted in a 50% increase in urine output and creatinine clearance and twofold increases in sodium and potassium excretion in patients with cirrhosis. Fractional sodium and potassium excretion, minimal urinary osmolality, plasma vasopressin and aldosterone levels, arterial blood pressure, and heart rate were not affected by naloxone treatment. The diuretic effect of naloxone was not observed in control subjects. Plasma naloxone levels were about six times higher in patients with cirrhosis than in control subjects (probably because of impaired metabolism of the drug) but only a weak correlation was found between drug levels and the degree of diuresis observed. The diuretic effect of naloxone may be related to an increase in glomerular filtration rate, possibly in conjunction with altered tubular reabsorption.

Aged↗