We reported last week about one of the first Apple Watch users who was surprised to find that he had atrial fibrillation (A-fib) after using the new ECG app. Now, that same 46-year-old was featured on ABC’s Good Morning America, sharing more details about how Apple Watch potentially saved his life.

Interestingly, Ed Dentel had some chest pain earlier this year, but received normal results after an electrocardiogram. If it weren’t for his Apple Watch and the warnings from his readings last week, he likely would have had no idea about his heart condition.

Dentel shared a brief summary of his experience with the ECG app on Apple Watch last week. He initially thought it was kicking out false positives for the heart condition A-fib. Here’s how Apple describes atrial fibrillation in its Health and ECG apps:

In the Good Morning America segment, Dentel shared more about his experience.

The next day, he tried again…

He decided to see a doctor, but almost didn’t follow through with it due his local clinic being busy.

“Right away: AFib. So I shut everything down and turned it back on and tried it again. Same result, same result, same result,” he said. He asked his wife to try. Hers came back normal. Twice. “I put it on my left wrist, on top, AFib. I put it on my left wrist, on the bottom, AFib. I switch to my right wrist. Same thing. So, starting to get a little bit alarmed here.”

Fortunately, he waited it out and had an electrocardiogram run by the clinic, which may have saved his life.

“I thought, ‘This is silly. I’ve got meetings, I’ve got stuff to do. I don’t have time to sit here and wait,’” he recalled. “But I looked down and checked the watch one more time, and it says ‘AFib.’”

The most powerful part about Dentel’s experience was that he had an electrocardiogram come back with normal results earlier this year after dealing with some chest pain. He likely wouldn’t have had any idea about having A-fib without the Apple Watch ECG app.

This seems to speak to how accurate Apple Watch ECGs can be for users, even though it works as a single-lead electrocardiogram.

Check out the full Good Morning America segment here.

More on Apple Watch health features:

  • How to take an ECG (electrocardiogram) on Apple Watch [Gallery]
  • How to improve Apple Watch heart rate readings
  • How to share ECG results with your doctor
  • What does an inconclusive ECG result mean on Apple Watch?
  • How to get the best ECG readings on Apple Watch