Health care professionals' understanding and day-to-day practice of patient empowerment in diabetes; time to pause for thought?

This exploratory study examines what Health Care Professionals (HCPs) working with diabetes patients, understand by the term 'empowerment', their attitudes towards it and whether they believe they practise in ways consistent with empowerment principles. A small sample of diabetes HCPs (N=13), from National Health Service (NHS) hospital, walk-in and General Practitioner (GP) clinics in South-East England, was interviewed. In-depth semi-structured interviews established attitudes towards and use of empowerment in day-to-day practice. Interviews were recorded, transcribed verbatim and analysed thematically. There was no clear specific understanding of what empowerment is and what it involves, although there was broad reporting of factors around education and informed choices. Disagreement was evident about the level of freedom patients should have in making choices - from leading them to the 'right' choice to an acceptance that they may have the right to choose not to be empowered. No consensus emerged on what is successful empowerment and how it is measured. The resistance of some patients to the process of empowerment in its original definition of active partnership in care, was seen as problematic by HCPs. Although empowerment is a popular concept in theory, its practical, clinical implementation day to day, can be problematic.

Metabolic production of carbon dioxide in simulated sea states: relevance for hyperbaric escape systems

Hyperbaric Escape Systems (HES) are used when saturation diving bells have to be evacuated and divers transported to safety. The aim of the present investigation was to determine the levels of metabolic CO2 production expected from the occupants of an HES in different wave states, and from this, to recommend a reasonable and safe requirement for scrubbing CO2 within an HES. The CO2 production and heart rate of 20 male subjects representing saturation divers were collected while they were seated in an HES seat, fixed to an inflatable rescue vessel. The vessel was tethered in a wave pool and longitudinal (L), perpendicular (P), and calm (C) sea conditions were reproduced. Heart rate did not differ between conditions (P=0.33) the mean (SD) heart rates (b x min(-1)) were: C: 71 (8.5); L: 74 (9); P: 75 (9). Carbon dioxide production was significantly higher (P=0.005) with the boat orientated perpendicular to the waves compared to the calm condition. The mean (plus 99% confidence interval) carbon dioxide production for each of the conditions was C = 319mL x min(-1) + (41mL x min(-1)) = maximum of 360mL x min(-1); L=374mL x min(-1) + (46mL x min(-1)) = maximum of 420mL x min(-1); P = 409mL x min(-1) + (57mL x min(-1)) = maximum of 466mL x min(-1). It is therefore recommended that a 12 person HES should be capable of scrubbing at least 8,053L of carbon dioxide in 24 hours. Thus, the current requirement for 8,415L in 24h is reasonable.

Raised serum prolactin in rheumatoid arthritis: genuine or laboratory artefact?

OBJECTIVES

Serum prolactin concentrations have been reported as higher, similar or lower in patients with rheumatoid arthritis (RA) compared with control subjects. We investigated whether low biological activity macroprolactin (a prolactin antibody complex), which is detected variably in different prolactin immunoassays, could account for the discrepant total prolactin results reported in RA.

METHODS

We compared serum total prolactin and free prolactin in 60 women with RA and 31 female controls.

RESULTS

No subject had hyperprolactinaemia or macroprolactinaemia. Serum concentrations of total and free (monomeric) prolactin were higher (P<0.05) in women with RA [mean (s.d.), 225.6 (104.6) and 201.6 (95.4) mU/l respectively] compared with controls [175.0 (68.5) and 154.0 (60.9) mU/l respectively].

CONCLUSIONS

We report higher serum free prolactin concentrations in women with RA compared with control subjects. This result indicates that the higher serum total prolactin levels in patients with RA are the consequence of increased free prolactin concentrations and are not due to macroprolactin.

Effect of protease inhibitor-containing regimens on lymphocyte multidrug resistance transporter expression

BACKGROUND

Increased expression of multidrug resistance transporters, such as P-glycoprotein (P-gp), has been suggested as a potential mechanism for decreased protease inhibitor (PI) availability at certain intracellular sites and tissue compartments.

OBJECTIVES

To investigate the effect of PIs on the surface lymphocyte expression of P-gp in vitro and in vivo.

PATIENTS AND METHODS

Peripheral blood mononuclear cells (PBMCs) were isolated from healthy subjects (n = 15) and incubated (72 h) with 10 microM of each PI studied (saquinavir, ritonavir, nelfinavir, indinavir, amprenavir and lopinavir), or dimethyl sulphoxide (DMSO) control. PBMCs were also isolated from HIV-infected subjects (n = 50; viral load <50 copies/mL) on a PI- or a non-PI-containing combination antiretroviral regimen. P-gp expression was analysed by flow cytometry.

RESULTS

No differences in surface P-gp expression on lymphocytes, CD4+ or CD8+ lymphocyte subsets were observed following incubation with 10 microM saquinavir, ritonavir, indinavir, amprenavir or lopinavir in vitro. Nelfinavir, however, increased P-gp expression. In vivo, no difference in P-gp expression on total lymphocytes was observed between patients receiving a PI-containing regimen [saquinavir n = 9, ritonavir n = 6, nelfinavir n = 7, indinavir n = 7 and lopinavir/ritonavir n = 13, and two nucleoside reverse transcriptase inhibitors (NRTIs)] and patients receiving a control regimen of three NRTIs alone (n = 8).

CONCLUSION

This study suggests that, of the PIs, only nelfinavir increases P-gp expression in vitro, and in vivo the PI class of antiretrovirals do not increase P-gp expression on lymphocytes. It is clear that factors other than PI induction are important in the inter-individual variability in the lymphocyte expression of P-gp.

P-glycoprotein and MRP1 expression and reduced ritonavir and saquinavir accumulation in HIV-infected individuals

OBJECTIVES

Efflux transporters may play a role in lowering intracellular drug concentrations. As the HIV protease inhibitors are substrates for the efflux transporters P-glycoprotein and MRP, we wished to investigate whether differences in expression of these transporters on human lymphocytes correlated with intracellular concentrations of ritonavir and saquinavir.

PATIENTS AND METHODS

Drug efflux transporter expression (P-glycoprotein and MRP1) on peripheral blood mononuclear cells isolated from HIV-positive patients was investigated using flow cytometry. In addition, plasma and intracellular ritonavir and saquinavir concentrations were measured by HPLC/mass spectrometry. The ratio of intracellular:plasma drug concentration was used to quantify intracellular drug accumulation.

RESULTS

Patients with lower MRP1 expression (<median) had a significantly higher accumulation of both ritonavir and saquinavir than those with higher MRP1 expression (P = 0.035, CI = -1.70 to -0.06 and P = 0.043, CI = -12.79 to -0.11, respectively). Ritonavir accumulation was significantly greater in patients with lower P-glycoprotein expression (<median) than in patients with higher expression (P = 0.014, CI = -1.56 to -0.14). There was no relationship between saquinavir accumulation in patients and P-glycoprotein expression (P = 0.219, CI = -5.02 to 2.40). Combining expression of P-glycoprotein and MRP1 (expression index, EI = [(P-glycoprotein - 1) + (MRP1 - 1) x 100]) resulted in a statistically significant relationship between transporter expression and intracellular accumulation of both saquinavir (r(2) = 0.195, P = 0.035) and ritonavir (r(2) = 0.220, P = 0.049).

CONCLUSION

Increased expression of P-glycoprotein and MRP1 on lymphocytes is associated with lower intracellular accumulation of saquinavir and ritonavir. These two transporters may play a role in the efflux of ritonavir and saquinavir from lymphocytes in vivo.

Age-related changes in the preattentional detection of visual change

The ability to detect changes in the environment which occur outside the focus of current awareness is essential if the individual is to be able to divert attention to biologically salient stimuli. The preattentional mechanism underlying the automatic detection of stimulus change in the auditory modality has been extensively studied by recording an event-related potential known as the mismatch negativity. Recently a homologous response from the visual cortex has also been described. Ageing has been shown to affect the efficiency of preattentional processing in the auditory modality, a factor which may contribute to cognitive changes in the elderly. It is unclear whether a similar effect occurs in the visual system. To investigate this issue the visual mismatch negativity was recorded from 12 older adults and 24 younger adults. Whereas the younger adults displayed a robust visual MMN, that evoked in the older adults was significantly reduced in amplitude. The results are indicative of age-related deficits in automatic visual processing.

Contribution of humoral immunity to the therapeutic response in falciparum malaria

The contribution of humoral immunity to the therapeutic response in acute falciparum malaria was assessed in a case-control study. Forty adult Thai patients with acute falciparum malaria who had subsequent recrudescent infections and 40 patients matched for age, therapeutic regimen, and disease severity who were cured by Day 28 were studied. All cured patients had positive immunoglobulin (Ig) G to ring-infected erythrocyte surface antigen (RESA) in their admission plasma, compared with only 60% of patients who failed to respond to treatment (P < 0.001). The proportion of IgM-positive cases at admission was also higher in the successfully treated group than in the group with failure (70% versus 30%) (P < 0.001). The geometric mean (95% confidence interval) reciprocal IgG titer at admission was significantly higher in cured patients (187.0 [83.5-418.3]) compared with those who experienced treatment failure (11.6 [5.1-26.5]) (P < 0.001). The patients with uncomplicated malaria who were both IgG and IgM positive at admission had significantly shorter fever clearance times and lower admission parasitemia levels compared with those who were negative (P = 0.01 and P = 0.02, respectively). The median (range) in vitro parasite multiplication rate was significantly lower in cultures containing positive anti-RESA antibody plasma compared with those containing normal plasma (0.7 [0.1-3.5] versus 2.6 [0.1-12.1]; P < 0.001). These results suggest that antimalarial antibodies may play an important supportive role in the therapeutic response to antimalarial drugs during acute falciparum malaria.

Developmental toxicity evaluation of unleaded gasoline vapor in the rat

To evaluate the potential of unleaded gasoline vapor for developmental toxicity, a sample was prepared by slowly heating API 94-02 (1990 industry average gasoline) and condensing the vapor. The composition of this vapor condensate, which comprises 10.4% by volume of the starting gasoline, is representative of real-world exposure to gasoline vapor encountered at service stations and other occupational settings and consists primarily of volatile short chain (C4-C6) aliphatic hydrocarbons (i.e. paraffins) with small amounts of cycloparaffins and aromatic hydrocarbons. A preliminary study in rats and mice resulted in no developmental toxicity in either species. However, a slight reduction in maternal body weight gain in rats led to the selection of rats for this guideline study. Groups of pregnant rats (n = 24/group) were exposed to unleaded gasoline vapor at concentrations of 0, 1000, 3000, or 9000 (75% lower explosive limit) ppm equivalent to 0, 2653, 7960, or 23,900 mg/m3, for 6 h/day on gestation days 6-19. All rats were sacrificed on gestation day 20. No maternal toxicity was observed. Developmentally, there were no differences between treated and control groups in malformations, total variations, resorptions, fetal body weight, or viability. The maternal and developmental NOAEL is 9000 ppm. Under conditions of this study, unleaded gasoline vapors did not produce evidence of developmental toxicity.

Fake artesunate in southeast Asia

Artesunate is a key antimalarial drug in the treatment of multidrug-resistant Plasmodium falciparum malaria in southeast Asia. We investigated the distribution of counterfeit artesunate tablets by use of the validated, simple, and inexpensive Fast Red TR dye technique. We also aimed to identify distinguishing characteristics of the fake drugs. Of 104 shop-bought "artesunate" samples from Cambodia, Laos, Myanmar (Burma), Thailand, and Vietnam, 38% did not contain artesunate. Characteristics such as cost and physical appearance of the tablets and packaging reliably predicted authenticity. The illicit trade in counterfeit antimalarials is a great threat to the lives of patients with malaria. The dye test will assist national malaria control authorities in urgently needed campaigns to stop this murderous trade.

Geriatric assessment in primary care: formulating best practice

Comprehensive geriatric assessment (CGA) is a structured approach to measuring physical, mental and social functioning of older people to identify needs and to plan care. Meta-analysis of trials of CGA suggest that it is cost-effective, but there is no agreed approach to its implementation in primary care. Our aim was to develop a best-practice model for geriatric assessment in primary care. We took an iterative approach to development, combining expert and local stakeholder opinion, and using semi-structured interviews to assess patient and practitioner experience in nine general practices in Sheffield. Patients were aged 75 and over, living at home. The best-practice model was the use of a standardized instrument (EASY-Care) to unselected patients aged 75 years and over living at home or in residential care, administered by a practice nurse in the context of an over-75s health check. There was high patient and practitioner acceptability, and significant cost savings were noted. Key beneficial features were the assessment of mental health and sources of support; goal-setting; generation of a disability score; and high patient satisfaction from contact with nursing staff. We conclude that geriatric assessment in primary care is feasible, economical and beneficial to patients and practitioners. Nursing staff are central to successful implementation of geriatric assessment in primary care.

Oral quinine pharmacokinetics and dietary salt intake

OBJECTIVES

The objective was to determine whether or not dietary salt intake affects the relative bioavailability of oral quinine. Salt intake has been shown to alter quinidine bioavailability.

METHODS

The pharmacokinetic properties of oral quinine sulphate (600 mg salt) were investigated in seven healthy Caucasian volunteers, in a randomised, crossover study, on low- and high-salt diets. Plasma quinine concentrations were measured by high-performance liquid chromatography (HPLC) and the 24-h urinary sodium excretion was assayed.

RESULTS

Although the 24-h urine sodium excretion was significantly higher when the volunteers were on a high-salt diet, there were no significant differences in quinine AUC0-infinity, tmax, and Cmax after the two diets. The median (range) quinine elimination half-life was significantly shorter after a high-salt diet [8.5 (4.3-10.2) h] than after a low-salt diet [10.0 (7.6-14.8) h] (P = 0.04).

CONCLUSION

Dietary salt does not affect the relative oral bioavailability of quinine sulphate.

Melioidosis and Pandora's box in the Lao People's Democratic Republic

Melioidosis has not been recognized previously in Laos, but within months of starting a prospective study of community acquired septicemia in Vientiane, 2 patients with melioidosis were identified. One was a previously healthy, 44-year-old female rice farmer who presented with supraclavicular lymphadenitis and the other was a 74-year-old man with diabetes and renal calculi who was receiving corticosteroids and had septicemia and septic arthritis.

Use of donepezil for the treatment of mild-moderate Alzheimer's disease: an audit of the assessment and treatment of patients in routine clinical practice

There have been a number of randomised, placebo-controlled trials of donepezil in the treatment of mild-moderate Alzheimer's disease and these report significant benefits for a proportion of patients. Little is known about the use of donepezil in routine clinical practice. The aims of this study were to examine the use of donepezil in routine clinical practice and to identify some of the practical and resource implications associated with treatment. A number of areas were examined against published guidelines including assessment, diagnosis, initiation of treatment, monitoring and discontinuation of treatment. This was a retrospective case note study involving patients with mild - moderate Alzheimer's disease over a one-year period. One hundred and seventeen patients were commenced on donepezil and 93 successfully completed three months of treatment. Of these, 47% demonstrated an improvement in cognition, activities of daily living or carer observation (or a combination). Compliance with accepted guidelines with respect to assessment, diagnosis and monitoring requires a standardised approach that has both clinical and resource implications.

Getting the questions right: an example of loss of validity during transfer of a brief screening approach for depression in the elderly

Screening for depression in the elderly has been advocated to improve detection and management. This article summarises the trend towards briefer screening instruments, and the integration of mental health screening with other assessments. The study aimed to validate a single question depression screen which has previously shown adequate sensitivity and specificity in a new context: a multi-faceted assessment instrument used by nurse practitioners within a community sample of over 75 year olds. The GMS-AGECAT computerised interview assessment was used as a 'gold standard' to determine the accuracy of the depression question in this new setting. Three hundred and twenty-eight patients were screened by their own nurse practitioners, of whom 100 consenting patients underwent a further interview with a research assistant using the GMS-AGECAT. The prevalence of depression was 30%, the sensitivity of the question was 67%, and its specificity 60% (compared with 88% and 71% previously). Responses indicating disability and loneliness were more closely correlated with depression than the depression screen itself. Relevant factors may include: the derivation of the question, the effect of a different sample, altered reliability when used by multiple interviewers, differing patient expectations, and the wording and context of the question within the multi-faceted screening instrument. Depression screening questions need repeated validation when used in different contexts. Patient and staff expectations may influence how screening instruments are used in practice in a way that may also alter reliability. Further studies are needed to establish the causes of loss of validity when screening approaches are used in new settings.

Antimalarial bioavailability and disposition of artesunate in acute falciparum malaria

The pharmacokinetic properties of oral and intravenous artesunate (2 mg/kg of body weight) were studied in 19 adult patients with acute uncomplicated Plasmodium falciparum malaria by using a randomized crossover design. A sensitive bioassay was used to measure the antimalarial activity in plasma which results from artesunate and its principal metabolite, dihydroartemisinin. The oral study was repeated with 15 patients during convalescence. The mean absolute oral bioavailability of the antimalarial agent in patients with acute malaria was 61% (95% confidence interval [CI], 52 to 70%). The absorption and elimination of oral artesunate were rapid, with a mean elimination half-life of antimalarial activity of 43 min (95% CI, 33 to 53 min). Following oral administration to patients with acute falciparum malaria, peak antimalarial activity in plasma and the area under the plasma concentration-time curve were approximately double those during convalescence and the apparent volume of distribution and clearance were approximately half those during convalescence (P < or = 0.005). Acute malaria is associated with a significant reduction in the clearance of artesunate-associated antimalarial activity.