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Cardiologists say they can use artificial intelligence to predict who will develop atrial fibrillation, which is very common and can be dangerous. NPR's Allison Aubrey reports.

ALLISON AUBREY, BYLINE: If you've ever had an EKG, or electrocardiogram, you know they're quick and painless. Tiny electrodes are placed on your chest, and your heart's electrical signals display as little waves and squiggles on a screen. Dr. Neal Yuan of the San Francisco VA Medical Center says this gives him lots of information to help make a diagnosis.

NEAL YUAN: We look at all those squiggles and then we say, well, we've got these rules for what sort of squiggle patterns look like what. And we have certain ideas for certain diagnoses based on certain patterns.

AUBREY: This may sound straightforward. The EKG has been around about a hundred years, and doctors know how to spot the obvious things - say, a heart attack or active AFib. But inside these little squiggles and waves, there's lots of information that doctors just can't easily see. But Dr. Yuan says technology can help.

YUAN: The machine can learn from seeing millions of ECGs. And it doesn't forget, and it, you know, doesn't grow tired (laughter), unlike, you know, humans.

AUBREY: He says each EKG produces about 20,000 numbers to decipher, which can overwhelm the human brain. But a machine can crunch these quickly. So as part of the new study, funded by the National Institutes of Health, he and some collaborators at Cedars-Sinai fed millions of data points from EKGs into a computer.

YUAN: What deep learning and machine learning allows us to do is it can hash through all of that information in the 20,000 different numbers...

AUBREY: And identify complicated relationships. In his study, the goal was to identify who is at risk of AFib. So they had the machine assess the EKGs of patients who'd had AFib in the last month, compared to those who had not to look for subtle differences.

YUAN: So it essentially takes in an ECG, and then it makes a guess based off those 20,000 numbers. And then it learns whether that guess is right or wrong, and then it adjusts its model to make a better guess next time.

AUBREY: Turns out the model they developed actually helped them predict who would develop AFib.

YUAN: I'm really excited about it.

AUBREY: Their new study, published in the medical journal JAMA Cardiology, is the first step to bringing this to clinical practice.

YUAN: We are at the forefront of this wave right now, right? And it's definitely coming.

AUBREY: Used in the right ways, he says AI can help doctors do their jobs better.

Allison Aubrey, NPR News.

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