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Anemia as a predictor of cardiovascular events in patients with elevated serum creatinine
Alexander M Walker1, Gary Schneider, Jason Yeaw
1i3 Drug Safety, Auburndale, Massachusetts, Thousand Oaks, California, USA.
Insights
Anemia significantly increases cardiovascular disease risk in patients with chronic kidney disease. Lower hemoglobin levels correlate with higher rates of myocardial infarction and heart failure hospitalizations.
Area of Science:
- Nephrology
- Cardiology
- Hematology
Background:
- Patients with anemia and chronic kidney disease (CKD) face heightened cardiovascular disease (CVD) risks.
- Previous studies were limited in scope, hindering detailed analysis of the anemia-CKD-CVD relationship.
Purpose of the Study:
- To investigate the association between anemia and cardiovascular events in patients with elevated serum creatinine.
- To quantify the risk of specific cardiovascular events and dialysis initiation in relation to hemoglobin levels.
Main Methods:
- Utilized a large insurance database linked with laboratory values.
- Included patients with elevated serum creatinine (women >1.2 mg/dl, men >1.4 mg/dl) from July 2000 to June 2003.
- Employed multivariate Poisson regression to analyze hospitalization rates for myocardial infarction, coronary revascularization, unstable angina, stroke, congestive heart failure, and new dialysis onset across different hemoglobin (Hb) levels.
Main Results:
- Anemic patients (Hb <12 g/dl) had a 2-5 times higher risk of myocardial infarction hospitalization compared to those with Hb 12.0-12.9 g/dl.
- Lower Hb levels were associated with increased incidence of coronary revascularization.
- Congestive heart failure risk was elevated in anemic patients, decreasing with rising Hb levels.
- Anemia showed a modest increase (7-34%) in the risk of progression to dialysis.
Conclusions:
- Anemia is a significant risk factor for cardiovascular disease in individuals with elevated serum creatinine.
- Maintaining adequate hemoglobin levels may mitigate cardiovascular risks in CKD patients.
- Findings highlight the critical interplay between anemia, CKD, and cardiovascular health.
Abstract:
Patients with anemia and patients with chronic kidney disease have elevated risks for cardiovascular disease. Available studies have been too small to provide details about the relationship or to provide for extensive covariate control. In a large insurance database with linked laboratory values, records of women with serum creatinine >1.2 mg/dl and men with serum creatinine >1.4 mg/dl, identified from July 2000 through June 2003, were sought, and the insurance claims searches for hospitalizations that were associated with myocardial infarction, coronary revascularization, unstable angina, stroke, or congestive heart failure. New onset of dialysis also was sought. Multivariate Poisson regression was used to estimate rate ratios for these events at various hemoglobin (Hb) levels, with adjustment for patient characteristics and previous event history. Among 88,657 patients with high serum creatinine, the risk for hospitalization with myocardial infarction was two to five times higher in anemic (Hb <12 g/dl) patients than in people with Hb from 12.0 to 12.9 g/dl. A similar but less dramatic pattern of higher incidence of coronary revascularization was observed with lower Hb levels. Risks for hospitalization with congestive heart failure declined regularly with increasing Hb levels from a doubling of risk at Hb <10 g/dl to a 61% decrease at 15 g/dl, both relative to 12.0 to 12.9 g/dl. The risk for progression to dialysis was only slightly elevated (7 to 34%) in anemic patients. Anemia raises the risk for cardiovascular disease in patients with elevated serum creatinine.
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