心脏病预防的经济账：CAC 扫描仅需 100 美元，Medicare 却为心梗支付 5 万美元

— The guidelines have finally caught up to the evidence supporting coronary artery calcium scans

by Arthur Agatston, MD, and Oren Mechanic, MD, MPH

October 25, 2026 • 3 min read

We are currently in a "golden age of medical science," yet in a "dark age of healthcare delivery." An important illustration is the diagnosis and treatment of America's number one cause of death and disability, coronary artery disease. More than 800,000 Americans suffer a heart attack each year. The great majority of these events are preventable. The coronary artery calcium score (CAC) is a simple 10-minute scan that can identify the presence and amount of coronary atherosclerosis many years before it causes a heart attack. It costs about $100 and uses a fraction of the radiation of a standard chest CT.

In March 2026, after more than three decades of accumulated evidence, the American College of Cardiology (ACC) and American Heart Association (AHA) finally gave CAC a central role in their national guidelines for the prevention of coronary artery disease. The CAC scan, which detects calcified plaque in the arteries, is recommended for adults with borderline or intermediate risk of coronary disease for whom the decision to start preventive therapy such as statin drugs remains uncertain.

For decades, doctors have relied on risk calculators built around age, sex, serum cholesterol, diabetes status, blood pressure, and smoking to estimate who might have a heart attack. The calculators estimate probability, not the actual presence of coronary atherosclerosis. In contrast, a CAC scan detects the disease itself. This is important because a patient with a borderline or low cholesterol may already have extensive plaque, while another with a high cholesterol may have none. A calcium score of zero re-classifies risk downward and thereby can avoid unnecessary pharmacologic treatment, such as statins. A score above 100 identifies patients who may benefit from pharmacologic and aggressive lifestyle intervention.

An excellent illustration of the role of CAC scanning is Rob*, a 52-year-old patient we saw recently. He exercises regularly, eats well, and has borderline high cholesterol. He has a family history of heart disease but no other known cardiac risk factors. The standard risk calculator places him in a low risk category, and he would prefer to defer treatment.

His CAC score, however, tells a different story. It is 220, indicating a substantial atherosclerotic plaque burden for a man his age. Genetics account for roughly half of cardiovascular risk, but the risk calculators do not include genetics. The scan demonstrated that drug treatment gives Rob his best chance of preventing a future heart attack.

Despite mountains of evidence proving its superiority over conventional risk factors for predicting heart attacks, CAC scanning has been included only peripherally in national guidelines for the past 35 years. Why?

Part of the delay is structural. Clinical decision support tools were built to modify population-average risk factors, not to incorporate individualized imaging. Guideline committees move cautiously, as they should, and prevention is harder to standardize than intervention. Cardiologists and primary care doctors, constrained by what insurers will cover, are left offering the test mainly to patients who can pay cash out of pocket.

随着ACC/AHA指南的更新，心脏病发作的预防终于围绕一个简单的原则达成一致：在可能的情况下，测量疾病本身。

人工智能（AI）也在改变预防的经济学。数百万美国人已经因其他原因接受过胸部CT扫描，但这些扫描中可见的心血管信息往往被忽视。AI可以机会性地识别冠状动脉和血管钙化，标准化报告，并标记出应接受正式预防评估的患者。这对于最无力自费进行选择性检查的患者尤为重要。

AI-CAC目前正被用于测量软斑块，这是传统钙化评分中所见硬斑块的重要前兆。若使用得当，AI赋能的CAC分析有望将心脏病预防推进到人群健康层面。

心脏病发作在很大程度上是可预防的，而我们已经拥有及时发现疾病并及时治疗的手段长达一代人之久。我们所缺乏的是一个愿意花100美元来避免5万美元急诊支出的支付体系。

CAC的故事并不那么独特。这是一个关于低成本、低风险、经过充分研究的工具如何在临床实践边缘徘徊数十年的故事，因为围绕它的系统——指南、报销代码、执业习惯——并非为接纳它而构建。

证据多年来一直很强，而指南终于跟上了。

*为保护隐私，患者姓名已更改。