AI and the future of early heart failure risk detection

AI and the future of early heart failure risk detection

April 29, 2026

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A new Oxford study shows that AI can predict the risk of heart failure up to five years in advance using routine cardiac CT scans. For those of us working in cardiovascular research every day, this is more than a headline. It is a signal of where the field is heading.

In April 2026, researchers at the University of Oxford published a study in the Journal of the American College of Cardiology that attracted significant attention because of its implications for earlier heart failure risk prediction. Their AI tool analyses subtle changes in the fat tissue surrounding the heart. These changes are invisible to the human eye, but the model can translate them into a clear, individualised risk score for heart failure.

The study included more than 72,000 patients across nine NHS trusts in England and followed them for a decade. The model demonstrated strong predictive performance for five-year heart failure risk, with a reported C-statistic of around 0.85 to 0.86. Patients in the highest-risk group were approximately 20 times more likely to develop heart failure than those in the lowest-risk group.

The statistics

The numbers are striking. But what matters most to us is not just the model's performance — it is what this capability could mean for patients.

  • 72K+

    patients across 9 NHS trusts

  • ~0.86

    reported C-statistic for five-year risk prediction

  • 20×

    higher risk in the top group


Earlier detection creates a critical window

Earlier detection creates a critical window

Heart failure is a progressive condition. Once it takes hold, management becomes increasingly complex and the burden on patients grows significantly. That is precisely why the timing of detection matters so much.

Identifying risk years before symptoms appear could give clinicians a meaningful window to monitor more closely, optimise treatment and potentially reduce progression to overt heart failure.

At Ictaro, we have long believed that early detection is one of the most powerful levers in cardiovascular care. This study reinforces that conviction with compelling evidence. A patient identified at high risk five years out is a patient who may be able to receive proactive, tailored support, rather than relying on reactive care once symptoms or structural damage have already emerged.

AI as a partner in cardiovascular research

What makes this development particularly compelling is its elegance. The Oxford tool does not require additional scans or invasive procedures. It works with cardiac CT data that is already being collected as part of routine cardiovascular assessment. From that existing data, it extracts information that was previously inaccessible.

That is a meaningful distinction. It means this kind of AI-driven insight could, in principle, be integrated into existing clinical workflows without requiring additional scans for patients, provided regulatory approval, implementation and real-world validation are successfully achieved.

This is the kind of AI integration that genuinely excites us: purposeful, additive and grounded in robust evidence. The Oxford team trained and externally validated their model across multiple independent centres. That is an important methodological step that many AI studies in healthcare fail to take. Multicentric validation matters, because a model that only works in the hospital where it was built has limited real-world value.

It is also worth noting, with appropriate scientific rigour, where we are in this journey. Demonstrating strong predictive performance is not the same as demonstrating improved patient outcomes. This is not yet proof that AI-guided intervention reduces heart failure, hospitalisations or mortality. But it is strong evidence that routine imaging may contain prognostic information we have not been able to access before. AI can help translate those hidden signals into clinically meaningful risk stratification.

The next chapter will be written through implementation studies and trials that measure whether acting on these risk scores actually changes how patients fare. That work is ahead of us, and it is exactly the kind of research the cardiovascular community should be pursuing together.

A glimpse of what is coming

This study is a powerful example, but it is not an isolated one. Across the field, AI is beginning to show what becomes possible when advanced computing meets deep biomedical insight. Applications are expanding rapidly, from the analysis of imaging data and ECGs to the interpretation of complex biomarker patterns and the earlier detection of arrhythmias and structural disease.

We see this as an important moment for cardiovascular research. The tools are becoming available to ask questions we could not previously answer and to see patterns we could not previously detect. That does not replace clinical expertise or the human judgement that sits at the heart of good medicine. It augments it.

At the same time, we are mindful that the integration of AI into clinical research and practice requires careful thought. Questions of regulatory approval, real-world performance monitoring, equitable access and the appropriate boundaries of algorithmic decision-making are not secondary considerations. They are central to responsible innovation. Deploying AI purposefully means asking hard questions alongside celebrating the possibilities.


What this means for the trials of tomorrow

For those designing and running cardiovascular trials, developments like this one open new possibilities. If AI tools can stratify patients by risk with greater precision before enrolment, we can design studies with sharper endpoints, more targeted populations and a better chance of detecting meaningful treatment effects.

Risk signals that once only became apparent after years of follow-up could, in future, help inform stratification at baseline. That is a horizon worth working towards.

At Ictaro, we are committed to being part of that journey. We partner with sponsors and investigators who want to push cardiovascular research forward, embrace the tools that are reshaping the field and ultimately deliver better outcomes for the patients at the centre of it all.

The Oxford team has shown us what AI can see when we point it in the right direction. Our job now is to build the research infrastructure that turns that insight into change.

Are you a sponsor or investigator exploring how emerging technologies can strengthen your cardiovascular trial? Let's shape the future of cardiovascular care together.

Sources

  • Oikonomou, E., Chan, K., Patel, P. et al. (2026). Early Prediction of Heart Failure From Routine Cardiac CT Using Radiomic Phenotyping of Epicardial Fat. Journal of the American College of Cardiology. https://www.jacc.org/doi/10.1016/j.jacc.2026.02.5116

  • University of Oxford, Radcliffe Department of Medicine (2026). New AI tool can predict heart failure at least five years before it develops. https://www.rdm.ox.ac.uk/news/new-ai-tool-can-predict-heart-failure-at-least-five-years-before-it-develops

  • British Heart Foundation (2026). New AI tool can predict heart failure at least five years before it develops. https://www.bhf.org.uk/what-we-do/news-from-the-bhf/news-archive/2026/april/new-ai-tool-can-predict-heart-failure-at-least-five-years-before-it-develops

  • Gregory, A. (2026, April 8). Scientists develop AI tool to spot heart failure risk five years before it strikes. The Guardian. https://www.theguardian.com/society/2026/apr/08/oxford-scientists-develop-ai-tool-spot-heart-failure