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Population strategies to decrease sodium intake and the burden of cardiovascular disease: a cost-effectiveness
Crystal M Smith-Spangler1, Jessie L Juusola, Eva A Enns
1Veterans Affairs Palo Alto Healthcare System, Palo Alto, California, USA. smith-spangler@stanford.edu
Annals of Internal Medicine
|March 3, 2010
Summary
Reducing sodium intake through industry collaboration or a sodium tax can significantly lower heart attack and stroke risks in the U.S. population. These strategies are projected to save billions in medical costs and improve public health outcomes.
Area of Science:
- Public Health
- Health Economics
- Cardiovascular Disease Prevention
Background:
- High sodium consumption is a major contributor to elevated blood pressure, increasing the risk of heart attack (MI) and stroke.
- The United States is exploring strategies to reduce population-wide sodium intake due to these health risks.
Purpose of the Study:
- To evaluate the cost-effectiveness of two distinct population-level strategies for reducing sodium intake in the U.S.
- Strategies assessed include voluntary sodium reduction in processed foods through industry collaboration and the implementation of a sodium tax.
Main Methods:
- A Markov model was utilized, incorporating four health states: well, acute myocardial infarction (MI), acute stroke, and history of MI or stroke.
- Data sources included the Medical Panel Expenditure Survey (2006), Framingham Heart Study, and the Dietary Approaches to Stop Hypertension trial.
- The analysis focused on U.S. adults aged 40-85 years over a lifetime horizon, from a societal perspective.
Main Results:
- Voluntary industry collaboration reducing sodium intake by 9.5% is projected to avert over 513,000 strokes and 480,000 MIs, increasing quality-adjusted life-years (QALYs) by 2.1 million and saving $32.1 billion.
- A 6% sodium tax is estimated to increase QALYs by 1.3 million and save $22.4 billion over the same period.
- Sensitivity analyses indicated that results are influenced by assumptions regarding consumer acceptance of modest sodium reductions.
Conclusions:
- Population-level strategies aimed at reducing sodium intake in the U.S. are likely to significantly decrease the incidence of stroke and myocardial infarction.
- These interventions are projected to yield substantial cost savings in medical expenses, estimated in the billions of dollars.
- Potential for complementary dietary changes resulting from these efforts exists, though their precise impact is difficult to predict.
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