E-Health In Developing Countries With A Special Focus On Nigeria Literature Review Sample

The first step in prioritizing healthcare resources is to estimate the burden of disease. High-income countries have reliable systems to assess the causes of death in the population; however, mid- and low-income countries do not have such systems in place, and mortality rates from a specific disease have to be extrapolated from incomplete data. Several studies have approached the problem of estimating the burden of disease by using a variety of methods to determine which diseases are responsible for the most deaths, which countries are carrying the highest burden of disease and death, and which populations are at the highest risk of death. These data help the allocation of resources where they can have the greatest impact on the delivery of healthcare.

Key words: burden of disease, health patterns, ICT

E-health in Developing Countries with a Special Focus on Nigeria
2. Global Burden of Disease
2.1 Introduction
Science is an evidence-based endeavour, and health science is no different. The healthcare system must have reliable and consistent data on the burden of diseases to allocate its resources and develop health policies to eradicate these diseases. However, a system has yet to be developed that can deal with all the fragmentary data that is still coming out of many areas of the world, unreliable data which unfortunately comes from those areas in the world with the greatest need of consistent data. Information technology has the potential of playing an important role in filling the missing gaps of information. New technological developments have made it possible for even those with minimal training to gather and consolidate data, where in the past it was a task reserved for the highly skilled.

2.2 Global Burden of Disease Analysis
Burden of disease analyses are central to health policy in several ways. Analyses of the demographics of disease help in the long-term assessment of performance within a country or region, or between countries and regions, and allow the tracking and judging of progress. Assessment of the burden of disease brings together a multi-disciplinary team of specialists, including epidemiologists and policy makers, who debate values and priorities and determine national health policy. Knowing where the burden of disease is highest allows countries to prioritize and target specific diseases in need of intervention, like HIV/AIDS or malaria across the African Region, or poliomyelitis in Nigeria (Akom, 2008).
Burden of disease analyses can also guide the training of healthcare specialists for the delivery of healthcare interventions where the need is highest. Medical personnel are a limited resource and like any valuable resource they should not be wasted; effective use of human resources is especially crucial in countries with the lowest doctor/nurse-patient rations, like Niger and Sierra Leone, and many other countries in the African Region (Akom, 2008). In countries such as these, information-driven allocation of resources can generate the greatest good. Unfortunately, data is not always available and the majority of the information that is available is either not consistent, or not very reliable.
Murray and Lopez (1997) evaluated the 1990 mortality rates in eight regions of the world, and found there were no data available for 15 million out of the 50 million people who die each year worldwide. Nevertheless, there were methods that could be used to estimate the cause of death. This is possible if one examines the epidemiological patterns and characteristics of a particular community. For example, Murray and Lopez collected data from a variety of sources to estimate cause of death patterns for 107 different causes of death. The various sources were then collated and compared to compile a pattern and derive a holistic picture of mortality. The findings of their study showed that 98% of the deaths of children below the age of 15 occurred in the developing world. The probability of death in this age group was highest in sub-Saharan Africa, with a mortality rate of 22.0%, compared to a low rate of 1.1% in developed countries. Global deaths in 1990 were mainly due to non-communicable diseases (28.1/50 million deaths), followed by communicable and nutritional disorders (17.2/50 million deaths). Pediatric deaths were attributed to perinatal disorders (2.4/50 million deaths), diarrhoea (2.9/50 million deaths), and measles (1.1 million/50 million deaths). Thus, half the leading causes of deaths were diseases that affect mainly children. This is particularly poignant because these diseases are largely preventable when access to healthcare is available and preventive methods followed. Injuries account for 10% of deaths around the world, but wide variations in the cause of these deaths preclude the assessment and management of data.
In 2006, Lopez et al. conducted a systematic analysis to evaluate the mortality, morbidity, and prevalence of 136 diseases and injuries for seven geographic areas of the world for 1990-2001, as well as 19 risk factors associated with these diseases. The results showed that out of 56 million people who died in 2001, 10.6 million were children, and 99% of them were from developing or transitional countries. Over 50% of the children deaths were caused by acute respiratory infections, diarrhea, malaria, HIV/AIDS, or measles. As high as these figures appear, the figures are 20% lower than the figures for 1990, except for the region in Sub-Saharan Africa, where the burden of disease increased due to the rampant HIV/AIDS epidemic. Half the disease rate was from non-communicable diseases and the leading factor was malnutrition. In addition, risk factors do not act in isolation but in concert with each other, thus 45% of global deaths are due to a combination of at least two risk factors. Overall, the burden of disease has improved around the world, although the numbers remain intolerably high.
Other studies continued to expand on the work of Murray and Lopez (1996). Mathers and Loncar (2006) conducted a study to project global mortality and burden of disease from 2002 to 2030 and found that Murray and Lopez had underestimated the impact of HIV/AIDS around the world. Mathers and Loncar projected future health trends using three scenarios; namely, baseline, optimistic, and pessimistic projections against data from previous studies. The advent of information technology (IT) technology has made data more readily available, although there are areas where the collection of reliable data remains illusive. In their study, Mathers and Loncar projected a shift in the burden of death from the younger to the older generation, and from communicable to non-communicable diseases, as is now seen in industrialized nations. The risk of death for children under 5 years of age is expected to fall by 50%. At the same time the study also projected a global rise in deaths due to HIV/AIDS, from 2.8 million in 2002 to 6.5 million in 2030. HIV/AIDS is projected to account for the largest number of deaths in developing and transitional countries by the year 2015, even under the most conservative baseline scenario. Of note, the fourth largest cause of death was projected to be due to road accidents. The figure shown below shows their estimated deaths in 2002 and the projected deaths in 2030 (Mathers & Loncar, 2006).

Fig. 1: Estimated 2002 deaths extrapolated to the year 2030

The authors acknowledged the limitations of their study and pointed out the transitional patterns of epidemiological characteristic of developing countries. Nevertheless, their projections seem more realistic than those in previous studies, as they took into account the aging of the global population, and used different scenarios by manipulating the same variables under various conditions. A more recent study by Mathers, Boerma, and Ma Fat (2009) also found that one-half of global children deaths are from the same four preventable and treatable communicable diseases described in earlier studies i.e., diarrhoeal diseases, prematurity and low birth weight, neonatal infections, and malaria. Their study also found that around 60% of global deaths occur from non-communicable diseases, again despite rising deaths due to HIV/AIDS. In addition, the study found major differences in the ranking of diseases between high-/mid- and low-income countries. The main causes of pediatric deaths in low-income countries were infectious and parasitic diseases, specially malaria, and perinatal conditions. The top three causes of death for adults in low-income countries were lower respiratory infections, HIV/AIDS, and ischaemic heart disease (Table 1).

Table 1. The Ten Top Causes of Death in Low-Income Countries

In contrast, in high-/mid-income countries, 90% of deaths were due to noncommunicable diseases or injuries. The top three causes of disease in high-/mid-income countries were ischaemic heart disease, stroke and other cerebrovascular diseases, and lower respiratory infections. In the paediatric population, diarrhoeal diseases were the predominant cause of death. Table 2 summarises the ten top causes of death in the world for all populations in high- and mid-income countries combined.

Table 2. The Ten Top Causes of Death in High- and Middle-Income Countries

This difference in the patterns of diseases between high-/mid-income and low-income countries reflects the differences in the demographics of mortality. The majority of deaths in low-income countries occur in the youngest population aged <15 years, whereas the majority of deaths in high-/mid-income occur in populations aged >15 years (Figs. 2-4). Figure 2 shows the death distribution by age in high-income countries. The majority of people (71%) in high-income countries lived beyond the age of 70. The predominant cause of death for this age group was chronic diseases, with cardiovascular and cerebrovascular diseases accounting for 15.6% and 8.7% of all deaths, respectively (WHO 2011). The only leading infectious cause of death was lower respiratory infections, causing 3.8% of all deaths (WHO 2011).

Fig. 2: WHO 2011 death distribution by age and income

Figure 3 shows the death distribution by age in middle-income countries. Nearly half (45%) the people live beyond the age of 70; and, like high-income countries, chronic diseases were the predominant cause of death, with cardiovascular and cerebrovascular diseases accounting for 13.7% and 12.8% of all deaths, respectively (WHO 2011). However, unlike high-income countries, chronic obstructive pulmonary disease represented a significant cause of death, at 7.2%. Infectious diseases like tuberculosis and HIV/AIDS were also among the leading causes of death, at 2.4% and 2.7%, respectively. Diarrhoeal diseases accounted for 4.4% of all deaths, mainly in the pediatric population (WHO 2011).

Fig. 3: WHO 2011 death distribution by age and income

The demographics are quite different for low-income countries (Fig. 4); less than 20% of the population lived beyond the age of 70, and 40% died below the age of 15. Table 1 shows the top ten leading causes of death in low-income countries. Infectious diseases accounted for the majority of deaths, including pulmonary infections (11.3%), diarrhoeal diseases (8.2%), tuberculosis (4.3%), HIV/AIDS (7.8%), and malaria (5.2%), a similar pattern of diseases as that found by Murray and Lopez (1997) in their study of the global burned of disease in 1990. The leading causes of deaths for mothers and infants are complications of pregnancy and childbirth, together accounting for close to 9% of deaths. Diarrhroeal diseases and malaria were also responsible for a significant number of pediatric deaths. These too corresponded to findings of earlier studies (Lopez et al., 2006; Murray and Lopez, 1997).

Fig. 4: WHO 2011 death distribution by age and income

Table 3 summarizes the studies by Murray and Lopez (1997), Lopez et al. (2006), Mathers and Loncar (2006), and Mathers, Boerma, and Ma Fat (2009).
Table 3. Summary of Studies on Global Burden of Disease and Mortality

Region with greatest burden of death
Major causes of
paediatric death
(millions)

Major causes of global death

(millions)

Murray and Lopez (1997)

50 million

Sub-Saharan Africa,

22.0% versus 1.1% in developed countries

Perinatal disroders, 2.4/50

Diarrhoea, 2.9/50
Measles, 1.1

Non-infectious diseases, 28.1/50; infectious diseases and nutritional disorders, 17.2/50

Lopez et al. (2006)

56 million

Sub-Saharan Africa,

50% due to acute respiratory infections, diarrhea, malaria, HIV/AIDS, or measles

Malnutrition, leading factor;
Non-infectious diseases, 50%;
HIV/AIDS
Mathers and Loncar

5773.2 million
African Region
Diarrhoeal diseases, prematurity and low birth weight, neonatal infections, and malaria
HIV/AIDS, 2.86.5
Non-coomunicable, 59% 69%

Mathers, Boerma, and Ma Fat (2009)

58.8 million

African Region

Infectious diseases, 50%
60% non-infectious

However, the picture is even more complex because there still exist wide regional variations in disease patterns among the various countries within each of these three income categories, especially among low-income countries. Thus, in recognition of the inequity in health among the various regions of the world, and with the standardization of data collection and analysis in mind, WHO organized all countries into six designated WHO regions: WHO African Region, WHO Region of the Americas, WHO South-East Asia Region, WHO European Region, WHO Eastern Mediterranean Region, and WHO Western Paciic Region, roughly equivalent to the categories used in the Lopez et al. (2006) study. A comprehensive list of the countries within each region may be found in World Health Statistics 2011 footnotes pages 169–170.
Figures 5 and 6 represent the WHO 2011 global infant and adult death estimates, respectively, according to each of the six WHO designated regions, with the high-income countries from each region separated off as a seventh group, the High Income Region. In accordance with other studies (Lopez et al., 2006; Mathers, Boerma, & Ma Fat, 2009; Mathers & Loncar 2006; Murray & Lopez, 1997), the African Region carried by far the greatest burden of disease; where the mortality rate exceeded that of all other regions by a factor of 2-5, in both the paediatric and adult populations.

Fig. 5: WHO 2011 Global Death Statistics for Children 0-4 Years

Fig. 6: WHO 2011 Global Death Statistics for Adults 15-59 Years
Figure 7 represents the WHO 2004 estimated child mortality rates by cause and region; 99% of deaths occurred in low-income and middle-income countries. Prenatal conditions and diarroeal diseases account for 42% and 54% of all deaths in children under the age of 5 in most regions except the Africa Region (25%), where post-natal mortality rates due to malaria (16%) drove the numbers down (WHO 2004). The highest burden of death for children under five years was borne by the African Region, amounting to 4.7 million out of 10.4 million deaths (45%). The second highest death rate occured in the Eastern Mediterranean, at 3.1 million (30%), which means that the death rate in the African Region is more than double that of all but one of the other six WHO regions. Diarrhoeal diseases and respiratory infections were the two leading infectious diseases.

Fig. 7: WHO 2004 child mortality rates by cause and region

The ranking of mortality rates according to region differs for the adult population, where low- and middle-income countries of the European Region have the second highest rate of mortality (Fig. 8). In addition, the difference in adult mortality rates between countries in the High Income Region and those in the six other regions is less pronounced than for child mortality, due in part to the presence of a large adult population in the High Income Region; except for the African Region, where AIDS/HIV drove the adult mortality rates up, to ten times that of the High Income Region.

Fig. 8: WHO 2004 adult mortality rates by cause and region

There were also wide variations within each of the WHO regions, although the widest variations were found amongst countries in the African Region. Figure 9 shows a breakdown of child mortality rates in the African Region according to country. A cluster of countries in West Africa between the Tropic of Cancer and the Equator, including Nigeria, Niger, Chad, Sierra Leone, and Liberia, had some of the highest levels on infant mortality in the world, with more than 150 deaths per 1000 live births (Fig. 9). This area lies within a challenging environment and is a hot pocket of parasitic and infectious diseases, like malaria, cholera, and meningitis, as well as a host of other diarrhoeal diseases, and HIV/AIDS (OECD 2008).

Fig. 9. Infant mortality in Africa; WHO, World Health Statistics 2007 Highlights and Table

The usual gender differences in the pattern of diseases were also found, although HIV/AIDS claimed by far the most lives for either sex. The second most common cause of deaths for both sexes was other infections and parasitic diseases. The main difference between the sexes was in the third cause of death, where males tended to lose their lives to injuries, and females died due to maternal and nutritional conditions (Fig. 10).

Fig. 10: WHO 2004 adult mortality rates in the African Region, by sex and major cause of death group

2. 3 Problems of gathering primary data
As critical as the acquisition of these data is, there remains considerable controversy regarding the methods of collection and analysis, as well as the sources of data, especially in African countries. An important factor to consider is that too often, the cause of death remains unknown. It is hoped that new developments in IT technologies may prove useful in facilitating the collection and evaluation of data in areas that have largely remained out of reach to researchers trying to collect demographic and epidemiological data.
As far back as 1976, Ayeni (1976) decried the lack of adequate health data in Africa, including patterns of disease, the extent to which medical facilities are used, the populations affected, and morbidity. These data would help health administrators understand the current health status of the population in the country, increase the ability to detect changes in this status, and allow for predictions of health trends. Unfortunately, data is incomplete, and when available, there is lack of uniformity in the way it is reported. Ayeni suggested that data collection should be delegated to skilled personnel trained for that specific purpose.
In 1988, Adekolu-John conducted a statistical study on the health status of the Kainji Lake Area of Nigeria and found that 42% of deaths occurred in children below 10 years of age. The leading causes of death were malaria, diarrhea, and measles. There were also epidemics that accounted for sporadic spikes in death rates. One curious statistic is that the number of births in the hospitals exceeded the number of registered births and there were no data recorded for hospital deaths of infants, let alone for deaths occurring at home. The reason for this omission is that there was little awareness of the need to register these data for national concern. Non-indigenous people who moved into the area did attempt to register the births of their children, but neglected to register their deaths.
In 2003, fifteen years after the Adekolu-John study, Agundu conducted a study on the type of health statistics and the way these statistics were being collected and found that there is no systematic approach to the collection of data, as well as a general lack of appreciation for the significance of statistical data. Data for the study was collected from 120 senior public health officials in Nigeria. The officials had little knowledge of statistics and their relevance to their work and the data was simply filed away for some unknown future use.
Thirty years later, Okonjo-Iweala & Osafo-Kwaako (2007) were still concerned about the lack of proper statistical data on the health patterns and morbidity in African countries. The authors suggest that the deplorable statistics on the health of African nations is due in part to the lack of statistical data to guide the allocation of necessary, and scant, resources. Setel et al (2007) referred to this phenomenon as “a scandal of invisibility,” stating that people don’t “count” unless they are counted, and discussed socio-political and economic, as well as cultural factors that impact the delivery of healthcare in developing and transitional countries.
2.4 Potential role of IT in gathering data

People living in developing countries, particularly those living in the sub-Saharan African region, face the heaviest burden of disease. It is a crisis that is deepened by poverty and the skewed allocation of resources. Bukachi and Pakenham-Walsh suggested that access to new information and communication technologies (ICTs) can help improve the delivery of healthcare in these areas. In fact, healthcare workers are already using information technology with remarkable success as a means of communication, collaboration, to access health data including clinical information and records, and for continuing health education. However, one problem the authors of this study encountered is the lack of uniformity in infrastructure, and that different cultural contexts require different models and approaches, especially when patients represent a major part of the equation. Bukachi and Pakenham-Walsh suggested that a combination of old and new technologies would benefit healthcare systems, healthcare provides and patients alike.

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