Cost Analysis of Iron-Related Complications in a Single Institute

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Abstract

INTRODUCTION

Secondary iron-overload causes various complications, such as liver cirrhosis, diabetes, and heart failure [1]. In Western countries, much experience has been accumulated with regard to chronic refractory anemia and its complications because of the high prevalence of thalassemia and sickle cell anemia. The survival of patients with thalassemia major has improved markedly, but the prevalence of severe complications such as heart failure, arrhythmias, and diabetes is still high.

In Korea, iron-related complications (IRCs) have not been a matter of concern. Patients with aplastic anemia or myelodysplastic syndrome can now live for a long time with supportive and curative treatments, including judicious blood transfusion and stem cell transplantation. Therefore, comprehensive studies of their secondary iron overload and its complications are needed. Consequently, we analyzed the medical costs of patients treated for IRCs at our institution.

METHODS

We searched the database of Seoul National University Blood Bank for patients transfused with more than ten units from 2002 to 2006. Their electronic medical records were reviewed to find patients with IRCs. The cost data for IRCs could be retrieved from electronic medical records for patients from 2002, when this records system was adopted at the hospital. The medical costs in the emergency room were included as either inpatient or outpatient costs. We defined items to assess the medical costs of IRCs, as described in Table 1.

Table 1

The tools used to the calculate medical costs for IRC^*

Specific tools were developed for calculating the costs of IRCs.

If the main cause of admission was IRCs, all medical costs were included (e.g., the costs for inotropics and diuretics used to treat dyspnea due to heart failure). If the main cause of admission was not IRCs, medical costs that had a definite causal relationship were included. For example, if a patient with cholecystitis was treated for heart failure during the admission, only the costs of the care for heart failure were included. Outpatient costs were calculated in the same way as inpatient costs. Cardiomyopathy, heart failure, diabetes mellitus, liver cirrhosis and liver cancer were defined as IRCs. Charges for diagnostic studies, medication and intervention were included. In the cases with cardiomyopathy and heart failure, charges for studies such as echocardiography and electrocardiography were included. Charges for inotropics (epinephrine, dopamine, dobutamine, digoxin, etc.), diuretics (furosemide, spironolactone, etc.), angiotensin converting enzyme inhibitors (ramipril, enalapril, etc.) and inhaled oxygen were included as charges for medication and intervention. Charges for intravenous fluids and catheters were excluded. In the cases with diabetes mellitus, charges for fasting blood sugar, post prandial blood sugar, C-peptide and ophthalmologic examinations were included as charges for diagnostic studies. Costs for insulin, oral hypoglycemic agents, education, costs of treating any complications related to diabetes were included. In the cases with liver cirrhosis and liver cancer, charges for ultrasonography, computed tomography, liver function tests, alphafetoprotein, hepatotonics, vitamins, ascites drainage and transarterial chemoembolization were included.

Costs with vague causal relationships to IRCs were excluded. Complications that have complex etiologies were also excluded. IRCs included cardiomyopathy, heart failure, diabetes mellitus, liver cirrhosis, and liver cancer because they have definite causal relationships with iron overload. Infection is a known complication of iron overload, but infection-related costs were excluded because infection can also be a consequence of an immuno-compromised state due to underlying diseases. Strict criteria were applied for additional costs associated with IRCs. Costs for routine follow-up, treatment of underlying disease or iron overload itself were excluded (e.g., routine laboratory tests, serum ferritin, and deferoxamine administration). Costs in other departments for treating IRCs were excluded from the analysis (e.g., stroke with diabetes).

RESULTS

Between 2002 and 2006, 650 patients with various hematologic diseases, including 358 with acute leukemia, 102 with lymphoma, 58 with myelodysplastic syndrome or myeloproliferative disease, 31 with chronic leukemia, and 46 with multiple myeloma, were transfused more than 10 units of red blood cells. Nine patients who developed IRCs were studied for the cost analysis. The primary diagnoses of eight patients were aplastic anemia and that of one patient was chronic lymphocytic leukemia. Two patients with aplastic anemia who had diabetes were excluded because one patient was treated at another hospital and the other was diagnosed with oxymetholone-induced diabetes. Table 2 shows the basic characteristics of the patients included and their medical costs related to IRCs. Liver cirrhosis developed in two, heart failure in four, and diabetes in three patients. The total cost for the seven patients was 47,388,241 KRW (approximately 50,000 USD).

Table 2

Basic characteristics of the patients and the medical cost associated with IRC^*

DISCUSSION

One large retrospective study in Italy showed that transfusion dependency and secondary iron overload have a significant impact on survival in myelodysplastic syndromes [2]. In an era of rising medical costs, cost-benefit problems are at the center of public attention in medical decision-making. The quality and quantity of life achieved by medical interventions are difficult to measure in purely financial terms. Many patients suffer because of the medical expenses they incur, in addition to the diseases that afflict them. In particular, recent advances in hematology and medical oncology have forced patients and physicians to balance the benefits and expenses of medical treatment. In Western countries, cost analyses of IRCs and iron-chelating agents are actively being conducted. In one analysis involving 31 thalassemia patients in America, IRCs were a major cost determinant and medical expenses increased sharply with the number of complications [3]. A lack of compliance with chelating therapy was associated with IRCs and high mortality [4,5]. Efforts to improve compliance with iron-chelating therapy might decrease the rate of IRCs and consequently lower the medical expenses.

Medical care costs for IRCs are now a matter of concern in Korea, since patients with refractory anemia from various causes live longer with the advances that have been made in therapeutic measures. Effective iron-chelating therapy with deferoxamine is difficult because of its inconvenience and poor compliance. Recently, oral iron-chelators (deferasirox and deferiprone), which are thought to be more accessible to patients who do not tolerate the parenteral route, were developed as an alternative [6,7]. Nevertheless, the use of oral iron chelators increases medical costs. If the seven patients in this study had received deferasirox from the date of the primary diagnosis until the end of follow-up, the total cost for the iron-chelating therapy would be 3,027,299,612 KRW. One recent study compared the cost-effectiveness of two iron chelators: deferasirox and deferoxamine. They used a Markov model to estimate quality-adjusted life years (QALY). The oral chelating agent deferasirox resulted in a gain of 4.5 QALY per patient at an additional expected lifetime cost of 126,018 USD per patient [8].

Our study revealed the considerable costs for IRCs in patients with hematologic diseases. We used strict criteria and ignored any costs related to a potential loss of social activity. More in the way of comprehensive health and economic studies of IRCs are needed for informed decision-making by patients, clinicians, and health policy makers.

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