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Biomedical subjects

E Shu

Publications and source records attributed to E Shu.

9 recordsLinked to original sources

Where do people from different socio-economic groups receive diagnosis and treatment for presumptive malaria, in south-eastern Nigeria?

The relationship between the socio-economic status (SES) of a household and its sources of malaria diagnosis and treatment was explored in south-eastern Nigeria. One aim was to see if, as seems likely, the poorest people generally seek care from 'low-level' providers, such as traditional healers and community-based healthworkers, because of their severe budget constraints. Interviewer-administered questionnaires were used to collect information from 1197 randomly selected respondents from four villages where malaria is holo-endemic. An index was used to categorize the study households into SES quartiles. The self-diagnosis of presumptive malaria and the use of patent-medicine dealers for treatment were very common among all the SES groupings. Compared with the other interviewees, however, the least-poor were significantly more likely to rely on laboratory tests for diagnosis and to visit hospitals when seeking treatment for presumptive malaria. The most-poor, in contrast, were significantly more likely to seek treatment from traditional healers or community-based healthworkers. Thus, even though the use of low-level providers was so common, there was still evidence of wealth-related inequity--in terms of the probabilities of the good diagnosis and treatment of malaria. Improvements in the quality of malaria diagnosis and treatment by the providers patronised by the most-poor villagers would help to redress this inequity, at least in the short- to medium-term.

Community Health Services↗

Onchocerciasis control in Nigeria: will households be able to afford community-directed treatment with ivermectin?

OBJECTIVES: To determine the level of affordability of community-directed treatment with ivermectin (CDTI) to households living in two onchocerciasis endemic Nigerian communities namely Toro in the north and Nike in the south. METHODS: The proportion of the cost of treating people with ivermectin will deplete in average monthly/projected annual household expenditure on food and health care, and on average monthly and projected annual household income were respectively calculated and used to determine the level of affordability of CDTI. Questionnaires administered to heads of households or their representatives were used to collect information on the household expenditures and income. The suggested unit CDTI cost of $0.20 was used. However, as a test of sensitivity, we also used the unit cost of $0.056 which some community based distributors are charging per treatment. RESULT: Using $0.20 as the unit treatment cost, this will consume less than 0.05% of average annual household income in both communities. It will equally deplete 0.05% of combined annual household expenditures on food and health care in both communities. However, using $0.056 as the unit treatment cost, then 0.02% of average annual household expenditure on health care, 0.01% average annual expenditure on combined health care and food, and 0.01% of average annual household income will be depleted. CONCLUSION: The households living in both communities may be able to afford CDTI schemes. However, the final decision on levels of affordability lies with the households. They will decide whether they can afford to trade-off some household income for ivermectin distribution.

Adult↗

Hypothetical and actual willingness to pay for insecticide-treated nets in five Nigerian communities.

OBJECTIVES: To determine the hypothetical and actual willingness of households to pay (WTP) for insecticide-treated nets (ITNs), and compare these in areas with and without previous exposure to free ITNs. METHODOLOGY: The contingent valuation method was used to determine the willingness of the heads of 1908 randomly selected households from five communities in south-east Nigeria to pay for two sizes of ITNs. Two communities previously had free access to ITNs. Validity was assessed using multiple regression analyses, and by offering ITNs for sale to 200 randomly selected people drawn from the original sample. The data was collected between March and September 1998. FINDINGS: Most respondents were willing to pay for ITNs: Mbano (93.26%), Ugwogo (97.69%), Orba (83.24%), Alor-uno (95.37%), and Ibagwa-ani (87.34%). In multivariate analyses, WTP was significantly associated with the number of people living in a household, sex of the respondent, average yearly expenditure on gifts and the type of savings scheme (P < 0.05). Some of the residences were also statistically significant in the two models used, and those with prior exposure to free ITNs were negatively related to WTP. Seventy-six percent of those who were hypothetically willing to pay actually purchased them, and the WTP technique correctly predicted the choices of 80% of the respondents. CONCLUSION: There was good evidence that stated WTP could be translated into actual WTP. However, peoples' perception of affordability of the nets and its link to their WTP needs further exploration. The WTP technique is a potentially valid tool for market research in healthcare, as it was able to predict the direction of actual WTP for the ITNs. The hypothetical WTP amounts could be used as guide to know either the optimal price to charge for the ITNs or the level of subsidy to introduce.

Adult↗

Willingness to pay for the retreatment of mosquito nets with insecticide in four communities of south-eastern Nigeria.

OBJECTIVES: To determine the willingness to pay (WTP) for the retreatment of insecticide-treated nets (ITN) in four malaria holoendemic communities of Nigeria. METHODS: Contingent valuation method. The study tool was a pretested interviewer-administered questionnaire. Randomly selected households were the study units and household heads or their representatives were interviewed by locally trained interviewers. RESULTS: Most households were willing to pay for annual ITN retreatment in all four communities. The proportion of those willing to pay ranged from 79% to 91%. WTP amounts ranged from $0.05 to $5.26. The median from the aggregated data from the four communities was $0.21. Multivariate analysis showed that many explanatory variables were statistically significantly related to WTP for ITN retreatment. CONCLUSION: WTP for ITN retreatment exists. The difficulty lies in implementing this. One possibility would be a community-based ITN retreatment programme.

Cross-Sectional Studies↗

Can community leaders' preferences be used to proxy those of the community as a whole?

BACKGROUND: Community-based distribution of ivermectin and other drugs requires people in the endemic communities who are capable of distributing the drug. It is essential also to collect information on local people's views concerning different financing mechanisms and approaches to distributing ivermectin. However, studies at household level are resource-intensive. Eliciting the preferences of the community by interviewing a smaller number of community leaders offers an alternative strategy. METHODS: A comparison of information from community leaders and household heads on the financing and distribution of ivermectin through communities was conducted in three communities in Nigeria to determine whether rapidly collected information from key community leaders could represent broad community preferences. RESULTS: The preferences of community leaders and household heads were comparable in relation to the method of collecting payments, managing payments and making payments, who should set the level of payments and the drug distribution mechanisms. However, there were differences between community leaders' views and those of heads of households concerning how the scheme should be supervised. CONCLUSIONS: This study has shown that community leaders' views can only be used as a partial substitute for more laborious methods of data collection insofar as they have the attraction of being quicker and less costly to use. However, they should not be assumed to be identical with the views of the community as a whole.

Attitude to Health↗

A telephone reassurance program for elderly home care clients after discharge.

Telephone reassurance programs (TRP) was developed to address the ongoing needs of chronically ill clients after home care discharge. Graduate students from Yale University School of Nursing worked with the Regional Visiting Nurse Agency of Connecticut, Inc., to develop this interesting program that could be replicated by home health agencies. Project objectives, a TRP protocol, program tools, potential benefits, and implications for agencies are presented.

Aftercare↗

Transcutaneous optical telemetry system with infrared laser diode.

A transcutaneous telemetry system is indispensable when monitoring and controlling the operation of an artificial heart totally implanted inside the body. A telemetry system using light is more useful than radio waves from the viewpoint of electromagnetic interference and power consumption. In this report, a transcutaneous optical coupler consisting of an infrared laser diode (LD) and a PIN photodiode (PINPD) was evaluated, and the transcutaneous optical coupling and information transmission characteristics were evaluated in in vitro experiments. The wavelength and directional angle of the LD used were 830 nm and 9.5 degrees, respectively. With regard to the directional angle of PINPD, the authors found that a PINPD with a larger directional angle allowed for more deviation between the axes optical axes of the LD and the PINPD. It was also found that the transcutaneous coupler had an optimum distance for the permissible deviation to be maximized. The information signals modulated by the phase shift keying (PSK) were transmitted at a rate of 9,600 bps through goat skin 4 mm thick, and demodulated by the phase locked loop (PLL) on the receiving side. As a result, the information signals were demodulated without any errors in deviation within 10.5 mm at a distance of 11 mm. In conclusion, the transcutaneous optical telemetry system using an infrared LD has sufficient characteristics to monitor and control the operation of an artificial heart totally implanted inside the body.

Heart, Artificial↗

Selection of a rechargeable internal back-up battery for a totally implantable artificial heart.

Three kinds of rechargeable batteries, NiCd, NiMH, and Li+, were compared for the purpose of selecting the most appropriate battery for use in a Rechargeable Internal Back-up Battery (RIBB) unit for a Totally Implantable Artificial Heart. Batteries of each kind were connected in series to obtain the required driving voltage of 24 V. The NiCd and NiMH batteries were charged by a constant current of 1 C, and the Li+ batteries were charged first by a constant current of 1 C and later by a constant voltage of 28.7 V. All three types of batteries were discharged using a dummy electronic pulsatile load consuming 20 W of power. The tests showed that the Li+ batteries were capable of supplying the required energy for more than 60 minutes. The Li+ batteries had a specific energy of 121.5 Wh/kg, which was more than 3x that of the NiCd and NiMH, and an energy density of 282.5 Wh/L more than double that of the other two. In addition, the Li+ batteries recorded the least temperature rise during charging and discharging. The results of our tests conclusively showed that the Li+ battery is the best among the three for use in an RIBB from the viewpoint of energy density and temperature rise.

Electricity↗

A transcutaneous energy transmission system with rechargeable internal back-up battery for a totally implantable total artificial heart.

We have been developing an externally coupled transcutaneous energy transmission system (ECTETS) for a totally implantable total artificial heart (TITAH). When the ECTETS is unable to supply the energy to drive the TITAH from outside the body, a rechargeable internal back-up battery (RIBB) implanted inside the body is used as a back-up to supply the required energy. This paper reports on the performance characteristics of our ECTETS with an RIBB. In this study, a lithium-ion (Li+) secondary battery was used as the RIBB. The transcutaneous energy transmission and the charging control characteristics of the ECTETS, while simultaneously supplying energy to the TITAH and the RIBB, were evaluated in an in vitro experiment. The output power and transmission efficiency of the ECTETS operating in this mode were found to vary from 20 W to 34 W and from 84% to 71%, respectively. It was also found that a sufficient power of more than 20 W could be supplied to the TITAH. The time needed to fully charge the RIBB was 117 minutes, and a fully charged RIBB could drive the TITAH, consuming 20 W for 62 minutes. It may, therefore, reasonably be concluded that the ECTETS with the RIBB is sufficient to drive the TITAH.

Animals↗