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Provider costs for prevention and treatment of cardiovascular and related conditions in low- and middle-income countries: a systematic review

BMC Public Health volume 15, Article number: 1183 (2015) Cite this article

Abstract

Background

The burden of cardiovascular disease (CVD) and CVD risk conditions is rapidly increasing in low- and middle-income countries, where health systems are generally ill-equipped to manage chronic disease. Policy makers need an understanding of the magnitude and drivers of the costs of cardiovascular disease related conditions to make decisions on how to allocate limited health resources.

Methods

We undertook a systematic review of the published literature on provider-incurred costs of treatment for cardiovascular diseases and risk conditions in low- and middle-income countries. Total costs of treatment were inflated to 2012 US dollars for comparability across geographic settings and time periods.

Results

This systematic review identified 60 articles and 143 unit costs for the following conditions: ischemic heart disease, non-ischemic heart diseases, stroke, heart failure, hypertension, diabetes, and chronic kidney disease. Cost data were most readily available in middle-income countries, especially China, India, Brazil, and South Africa. The most common conditions with cost studies were acute ischemic heart disease, type 2 diabetes mellitus, stroke, and hypertension.

Conclusions

Emerging economies are currently providing a base of cost evidence for NCD treatment that may prove useful to policy-makers in low-income countries. Initial steps to publicly finance disease interventions should take account of costs. The gaps and limitations in the current literature include a lack of standardized reporting as well as sparse evidence from low-income countries.

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Background

Cardiovascular disease (CVD) and CVD risk conditions, such as hypertension, type 2 diabetes mellitus (T2DM), and chronic kidney disease (CKD), are the leading cause of global morbidity and mortality [1]. Increasingly larger proportions of the global population are exposed to risk of non-communicable disease (NCD), such as urbanization, tobacco use, and sedentary behavior [2]. The growing prevalence of these conditions is particularly troublesome in low- and middle-income countries (LMICs), where age-specific rates for NCD mortality are nearly twice as high as in high-income countries [3], and treatment can be very costly [4]. There is evidence that health systems in these settings are already strained by the dual burden of infectious and chronic disease, especially in resource-limited settings [5]. Many people suffering from CVD in LMICs remain untreated, or their conditions are poorly managed, due to lack of access to primary health care and high costs [6].

Efforts to improve prevention and management of NCDs in LMICs are increasing. Mortality reduction targets, such as the World Heart Federation’s 25 × 25 and the Lancet’s 40 × 30, are unprecedented in putting NCDs on the international agenda [7, 8]. The resources required in order to meet these targets in any given LMIC are less clear. Economic evaluations are especially important for settings that do not yet have policies or the infrastructure in place to address these emerging issues [9]. Unfortunately, financial and economic cost estimates of these interventions in LMICs are limited. In order to raise awareness of the economic costs of CVD and to support increased allocation of resources for addressing CVD and risk conditions, accurate cost data are needed by donors, ministries of health and economic modelers.

Recent reviews of household burden or cost-effectiveness of CVD interventions in LMICs have been published [6, 10–13]; however, there are no recent reviews, to our knowledge, of provider-incurred costs of interventions for CVD and risk conditions. We therefore reviewed literature on the provider-incurred costs for the treatment of cardiovascular and related risk conditions in health system settings of LMICs. Specifically, we consider diabetes, chronic kidney disease, hypertension and hyperlipidemia, stroke, ischemic heart disease, and non-ischemic heart diseases. We chose these conditions because of their interrelated risk factors and the large overlap in clinical resources that are required to management them. We will refer to the entire grouping as “CVRD” (cardiovascular and related diseases) throughout the remainder of the paper.

Our primary objective was to present the level and variability in direct medical or programmatic costs for treating CVRD in LMICs. Our secondary objective was to identify gaps in knowledge and suggest future economic research needs to support policy development, resource allocation, and decision-making.

Methods

Search strategy and article retrieval

We conducted our review according to the PRISMA guidelines [14]. We searched the following databases: Medline, EMBASE, NHS-EED, HEED and EconLit. We adapted the search terms specifically to each database, using 1) terms related to cardiovascular diseases and risk conditions plus 2) terms for LMICs and regions plus 3) terms denoting economic evaluation. Additional file 1 details the full strategy. We limited our results to articles published on or after January 1st, 2000 until approximately July 1st, 2014. We screened eligible titles and abstracts to determine which articles would be included for final review. Two independent reviewers reviewed the full text articles. In addition, we examined the references of the included articles and prior reviews for potentially relevant studies. Broadly, the following criteria were used to determine inclusion:

  • Included an economic evaluation

  • Included evaluation of at least one low- or middle-income country (as defined by the World Bank)

  • Referred to our previously standardized list of cardiovascular or related-related conditions

  • Made available in English

  • Published on or after January 2000.

We used both the Drummond Checklist and Mogyorosy and Smith’s 2012 literature review for guidance in creating the following guidelines regarding quality and inclusion [15, 16]:

  • The study must have conducted at least one type of economic evaluation, including cost analysis, cost-effective analysis, or cost-utility analysis, with clearly presented unit cost data.

  • We did not consider costs with health outcomes as a denominator, such as disability-adjusted life years (DALYs), quality adjusted life years (QALYs), or life-years saved (LYS).

  • The study must have utilized either original unit cost data regarding a CVRD intervention delivered in a health systems setting, or unit costs from a credible and known source, such as WHO-CHOICE. We did not consider population-level interventions or policy costs.

  • The study must have presented direct intervention costs (medical or programmatic) from the provider perspective, regardless of payer or indirect costs. Studies that considered multiple perspectives were only considered if they clearly delineated provider costs. Provider costs were defined as those delivering the services, such as those incurred by health systems, hospitals or clinics, governmental bodies, funders, or programs.

  • The study had to meet certain quality standards, which includes having a description of the intervention and analysis, detailing the time and location of data collection, and clearly stating the year and currency of presented costs.

To inform the organization and synthesis of the literature across conditions and interventions, we created a conceptual framework of the clinical and public health considerations in CVD treatment (Fig. 1). There are several points at which one can intervene on cardiovascular risk factors, risk conditions, and CVDs themselves, both within and outside of the health system. This review examines only the costs that exist within the health sector, and health facilities specifically, but across the spectrum of cardiovascular risk conditions and diseases themselves.

Fig. 1
figure 1

CVRD Conceptual Framework. This framework informed our inclusion criteria and subsequent data extraction and organization

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Data extraction

For each eligible study we entered the following information into an electronic database: condition(s), country or region, target population, type of treatment or intervention, and level of care. We also noted study methods, such as sample size and strategy, exchange rate, discount rate, sensitivity analysis, and cost categories. The total treatment or intervention costs, defined as the total cost per patient, were extracted in their original currency and year. For acute events, we used the total cost per patient as presented. For recurring costs, such as hemodialysis treatments or ongoing hypertension management, we calculated the cost per treatment or per year. Differences in inpatient and outpatient costs were noted where reported and applicable. Of note, most of the included studies reported multiple costs, particularly if they discussed more than one CVRD intervention or more than one geographic setting.

We converted all costs to US Dollars (2012), the currency and year in which we present all costs in this paper. When possible, we extracted the data in local currency units (LCUs), inflated it to 2012 rates using the World Bank consumer price indices, and converted it to 2012 US Dollars via World Bank rates. When costs were presented for regions, we used the largest LMIC country in the region as a proxy. For data presented in international dollars, we converted it back into LCUs using World Bank Purchasing Power Parity, then we followed our standard processes. Once the data were in a common currency, we grouped similar interventions and qualitatively compared the magnitudes and variability of total and input costs. We combined data into the two overarching groups to reflect our aforementioned framework: management of CVD risk conditions and treatment of acute and chronic CVDs. The former group included hypertension, hyperlipidemia, CKD, T2DM, and generic CVD prevention. The latter group focused specifically on ischemic heart disease, non-ischemic heart diseases, stroke, heart failure, T2DM sequelae (specifically, microvascular complications such as foot ulcers and retinopathy), and end-stage renal disease (ESRD), which is due predominately to poorly controlled hypertension and T2DM.

Results

The results of the systematic search process can be found in Fig. 2. 60 studies met our final inclusion criteria, presenting approximately 143 unit costs reported in Table 1. An additional 121 studies were reviewed at the full text stage but were excluded on the basis of our inclusion criteria or for methodological reasons, i.e., they did not meet the criteria in our quality checklist.

Fig. 2
figure 2

Article Selection Flow Chart (PRISMA STANDARDS). Flow diagram for the selection of published articles evaluating the costs of providing preventive care or treatment for cardiovascular disease, diabetes, and chronic kidney disease in low- and middle-income countries

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Table 1 Unit cost data for the treatment of cardiovascular risk conditions (USD 2012)
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The number of published articles for CVD costs in LMICs has increased dramatically since 2000, as seen in Fig. 3. In fact, we identified only five articles in the years 2000–2006, increasing to 16 articles published in 2013, the last complete year of our review. Most of the cost data occurred either in urban areas or at the national level of middle income countries, with only four studies considering low-income countries. The sample is mainly from Asian countries (34 articles), dominated by studies from India (8 articles) and China (12 articles). Almost a quarter of the cost data came from China; India contributed the next highest frequency of cost data (14 %). One-third of our cost data concerned diabetes, which was a considerably higher proportion than any other condition, and two-thirds of those diabetes costs were from Asian-based studies.

Fig. 3
figure 3

Articles Published by Year & Region. Figure shows the number of articles identified by our study disaggregated by the year in which they were published and the region (as defined by the World Bank) for which they provide data. Studies providing data for more than one region were categorized as “multiple”

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We obtained cost data from a variety of economic evaluations. Almost two-thirds of the articles (n = 37) were cost analyses, meaning they only collected and presented data on costs, not health outcomes. Thirty studies determined the total costs of interventions by reviewing hospital records while 29 studies used an ingredients approach, taking the sum cost of activities and resources used to find the total costs. Only one study used a questionnaire to collect data. Of the 60 studies, over half converted their costs in US Dollars or the hypothetical currency “International Dollars” for presentation (32 articles). Although it is difficult to measure the quality of a study objectively, economic evaluation guidelines recommend discounting future costs and conducting sensitivity analyses when assumptions are made. We noted that approximately one-third of the 60 studies conducted sensitivity analysis, and one-fourth used discounting in their methods; 11 articles used both.

Management of cardiovascular risk conditions

Our review identified 60 cost estimates from 31 articles for clinical management of CVD risk conditions such as hypertension, hyperlipidemia, chronic kidney disease and T2DM). There were also brief mentions of pharmacological tobacco cessation measures, rheumatic fever and generic CVD prevention strategies such as polypill use. More than three-quarters of this data came from Asian countries, and more than half from China, India or Thailand.

We found 14 unit costs for hypertension management in LMICs, with drug therapy ranging from $2.21–$76.29. Using general practitioners in community programs cost only $0.81–$8.67 per patient per year, compared to annual outpatient costs to manage hypertension, which ranged from $38.00 to $565.54 per patient. Only three studies mentioned the costs of managing dyslipidemia, which were similar to managing hypertension. One study looked at the costs of managing chronic kidney disease across China, Malaysia and Thailand, with China being more expensive than Malaysia by a scale of six to eight. We identified 30 unit costs for managing diabetes. Two studies produced four costs on diagnosing diabetes, the most expensive of which were based in tertiary hospitals. Seven studies presented ten annual per patient costs of managing diabetes in a clinical setting, which ranged from $56.25 in India to $2,479.82 in China; the costs were higher in cases with complications and sequelae. Nine studies also presented 16 costs on inpatient and outpatient treatment for diabetes. Inpatient stays per bed-day ranged from $59.92–$143.14 with an average length of stay of around 7 days. An outpatient visit ranged from $4.63–$34.28, and we also found a ten-fold variation in yearly outpatient costs.

Treatment and management of acute and chronic cardiovascular conditions

Our review also identified 83 cost estimates from 34 studies regarding the treatment of ischemic heart disease (IHD), stroke, heart failure, non-ischemic heart diseases, T2DM sequelae, and end-stage renal disease (ESRD).

Treatment of IHD typically consists of diagnostic procedures, surgical or other advanced medical procedures, and post-operative and long-term outpatient care. We found 8 articles analyzing IHD treatment with a total of 18 unit costs. An inpatient visit averaged $8,800, with a range from $455 to $22,500. The highest inpatient costs were associated with longer hospitalization periods, more severe conditions, and surgical interventions. The costs of surgical procedures, including catheter-based procedures (stenting and angioplasty) or coronary artery bypass surgery (CABG), ranged from $4,000–$22,000 per patient per procedure depending on the diagnostics, the complexity of the procedure, and whether medical therapy and recovery costs were included in the total cost estimates.

Our search returned 15 articles and 24 unit costs for both ischemic stroke (IS) and hemorrhagic stroke (HS), though many studies did not specify the type of stroke. In most settings, IS is the more common of the two, is generally easier to treat, and has a lower case-fatality rate. Four articles compared the costs HS and IS treatment [17–20]. Hemorrhagic strokes were generally more severe, required longer hospital stays, and involved surgical or intensive care unit costs; HS treatment costs were between 0 % and 50 % higher than IS treatment. The majority of articles provided the inpatient cost per stroke event, but did not distinguish the type of strokes. The average inpatient cost of a stroke was $3,240, but this varied widely by geographic setting, technical resources used, and average length of stay.

Five studies reported costs of T2DM sequelae, namely, diabetic foot ulcers and retinopathy. Severity of these impairments and costs saved by screening drove the total costs of both, though in opposite directions [21–25]. For instance, screening for retinopathy was generally below $30, while diabetic foot ulcers ranged from less than $1 to over $7,000 in the cases of infection and amputation.

Five studies reported costs of end-stage renal disease (ESRD), primarily long-term dialysis or renal transplantation. The cost of one session of hemodialysis for ESRD ranged $79 to $97 [26–28], while one study estimated average annual dialysis costs at $61,000 in Southeast Asia [29]. Kidney transplantation and post-operative care ran from $5,000 to $21,000 in the Sudan and Iran, respectively [28, 30].

Other types of CVD, such as heart failure, Chagas cardiomyopathy (CC), congenital heart disease, and rheumatic heart disease, are important contributors to the burden of NCDs in LMICs. However, we identified only a handful of studies on the cost of treating these conditions (Table 2).

Table 2 Unit cost data for the treatment of cardiovascular disease and related condition (USD 2012)
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Discussion

Treating CVD and its risk conditions is complex, due in part to the interrelationship between hypertension, diabetes, and ischemic heart disease, and the fact that multiple shared risk factors affect CVD health outcomes. The clinical heterogeneity of CVD can make treatment costs for a single condition much more variable than in the case of infectious diseases or some other chronic diseases; these factors also affect the mean and distribution of costs within and across similar conditions. For instance, CVD encompasses different types of heart and related diseases, such as hypertension, stroke, and heart failure, with different levels of severity, and associated care and management. There are numerous clinical protocols for treating complicated conditions, and treatment includes different combinations of drugs, diagnostics and imaging technologies, surgery and different requirements for inpatient care and follow-up visits, making comparisons between studies all but impossible. Additionally, there are large variations in clinical characteristics, capabilities, and practices among and within countries; it is possible to have a wide distribution of costs even within a hospital if they offer various levels of care, such as general, specialty, and intensive care wards [31].

Another factor affecting the variation in costs was differences in methodology used across studies. There was a lack of standard reporting across the studies, most notably failure to describe cost ingredients. When studies disaggregated costs, there were not clear and common categories for input or activity cost categories. In addition, for disaggregated input costs, it was unclear when activities included personnel in the costs. Many studies provided costs for imaging, diagnostic or therapeutic services, without indicating whether personnel costs were included. Surgery was a common category, but descriptions of what resources comprised surgery or surgical procedures were absent from the majority of the studies. Cost data was most informative when disaggregated into categories and inputs, allowing the reader to better understand heterogeneity and make more useful comparisons. We also noticed a lack of clinical protocol reporting in publications. Reporting on clinical protocols underlying the CVD interventions may help readers evaluate the comparability and transferability of costs estimates across studies, depending on the study objective.

Trends in the data emerged despite these limitations. It is clear that there is growing interest and concern about the prevalence and cost of treating cardiovascular and risk conditions at every national income level. BRICS countries and a few other populous Asian countries produced about three-quarters of the literature we identified, laying a foundation of evidence for the costs of treating CVRDs in LMICs. The current evidence confirms that is expensive to provide treatment for complicated or advanced cardiovascular conditions, with inpatient treatment for CVD easily costing upwards of $10,000 per patient (Fig. 4). Looking at the distribution of costs by condition, managing risk conditions is generally much less expensive than treating acute CVD conditions (Fig. 5).

Fig. 4
figure 4

Hospital Costs by Condition (USD 2012). Showing the average, minimum, and maximum costs of inpatient treatment for various cardiovascular and chronic kidney disease conditions. Source: extracted cost data for this review

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Fig. 5
figure 5

Unit Cost Distributions. Figure of four overlapping histograms showing the distribution of identified costs per patient for four conditions: hypertension management, diabetes mellitus, stroke, and acute ischemic heart disease. These four conditions had the most robust data available in the review

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Our review identified critical gaps in information and demonstrated the substantial heterogeneity in treatment costs for CVRD across the available data for LMIC countries. The most obvious gap was the need for more consistent methodology, with clear presentation of data on cost ingredients and drivers. Cost data are used to inform resource allocation and to improve efficiency; health policy makers thus need to understand the underlying causes of health expenditures in order to make informed decisions. We identified no longitudinal studies in LMICs, however several modeled studies looked at health costs over a longer period of time. We anticipate that longitudinal studies would be particularly revealing regarding costs of chronic conditions, such as hypertension and diabetes, which require lifelong management. In the absence of longitudinal studies, health decision-makers are currently allocating CVD resources with an incomplete picture of future costs.

We found very few cost analyses of CVD conditions conducted in low-income countries. While these countries are likely the most heavily resource-constrained, they are also likely the least prepared to prevent and treat CVD conditions. We found no data on the cost of diabetes care in low-income countries. Middle-income countries, particularly upper-middle income countries such as Brazil, China, and South Africa, have produced research or publications regarding technologically complex interventions, revealing relatively higher health system capacity. As the double-burden of infectious and chronic conditions increases, and policy makers in low-income countries expand health resources for chronic conditions, published studies from other LMICs can provide economic evidence on CVD interventions.

Because our analysis focused on the unit costs of clinical interventions, we did not include many of the WHO Best Buys for NCDs such as tobacco taxation and regulation, population salt regulation, or health and physical activity promotion. Population based prevention measures typically cost pennies per person, but the total cost to the government will depend on the population size. It was beyond the scope of this paper to compare the total costs of population based interventions with clinical prevention and treatment costs. The evidence in this review strongly suggests that costs quickly escalate with advanced CVRD treatment; future investment in population prevention of CVRDs could reduce the need for these expensive clinical interventions.

We also excluded studies presenting the cost of implementing guidelines for initiating prevention strategies of CVRDs based on absolute risk [32, 33]. While prevention is extremely important for averting premature death and the high costs of surgery and post-operative care, setting risk guideline thresholds is less associated with changes in unit costs than with changes in long-term cost-effectiveness and total budget impact. The economic evaluations we identified regarding risk guidelines ultimately fell outside of our purview due to their health outcome denominators.

Conclusion

The evidence for CVRD treatment and prevention costs in LMICs is limited, particularly in low-income countries. We recommend conducting economic studies alongside efforts to scale up treatment and preventions on CVRD in these settings. Initially standard methods of care or clinical protocol could be used to inform costs of CRVD treatment and prevention in order to estimate costs and their key drivers are across settings. There is also a need to estimate the actual resource use and costs in the provision of care, as such information can be used to improve efficiency and budgeting over time. In addition to following recommended costing analysis protocols [15], future research on the costs of CVD prevention and care should disaggregate the cost inputs, especially long term costs, since most individuals with CVRD experience worsening disease severity and more sequelae over time.

The burden of CVRD in LMIC is already substantial and will continue to increase in the absence of concerted prevention efforts, which could contain costs by reducing future spending on CVD. At the same time, the prevalence of CVD is already very high in regions such as Latin America and South and East Asia. Hence, efforts to allocate NCD resources equitably will inevitably include a balance of both prevention and advanced treatments for existing cases of CVD. Ongoing efforts to understand the cost of delivering CVRD care in these regions will be critical to achieving universal health coverage and improving overall population health.

Abbreviations

CKD:

Chronic Kidney Disease

CC:

chagas cardiomyopathy

CVD:

Cardiovascular disease

CVRD:

Cardiovascular Disease and Risk Conditions

DALY:

Disability-adjusted life-year

ESRD:

End-stage renal disease

LYS:

Life years saved

LCU:

Local currency unit

LMIC:

Low- and middle-income countries

NCD:

Non-communicable disease

QALY:

Quality-adjusted life-year

T2DM:

Type two diabetes mellitus

WHO:

World Health Organization

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Acknowledgements

We thank the Bill & Melinda Gates Foundation for generous funding through the Disease Control Priorities Network grant to the University of Washington.

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Authors and Affiliations

  1. Disease Control Priorities Network, Department of Global Health, University of Washington, 325 Ninth Avenue, Box 259931, Seattle, WA, 98104, USA

    Elizabeth D. Brouwer, Rachel Nugent & Carol Levin

  2. Department of Medicine, University of Washington, 325 Ninth Ave, Box 359780, Seattle, WA, 98104, USA

    David Watkins

  3. School of Public Health, University of California Berkeley, 50 University Hall, #7360, Berkeley, CA, 94720-7360, USA

    Zachary Olson

  4. PATH, 2201 Westlake Ave #200, Seattle, WA, 98121, USA

    Jane Goett

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Correspondence to Elizabeth D. Brouwer.

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The authors declare that they have no competing interests.

Authors’ contributions

JG developed and carried out the search strategy. ZO participated in screening the literature and extracting data. DW contributed to conceptualizing the paper and revising drafts of the manuscript. CL contributed to conceptualizing the paper, analyzing the data, drafting and revising the manuscript. EB participated in screening the literature, extracting data, analyzing the data, and drafting and revising the manuscript. RN contributed to organizing the paper and revising drafts of the manuscript. All authors read and approved the final manuscript.

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Full search report. (DOCX 21 kb)

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Brouwer, E.D., Watkins, D., Olson, Z. et al. Provider costs for prevention and treatment of cardiovascular and related conditions in low- and middle-income countries: a systematic review. BMC Public Health 15, 1183 (2015). https://doi.org/10.1186/s12889-015-2538-z

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Keywords

  • Cardiovascular disease
  • CVD
  • Systematic review
  • Economic evaluation
  • Non-communicable disease
  • Cost analysis

BMC Public Health

ISSN: 1471-2458

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