Apple Watch comes to the rescue once again, this time alerting 36-year-old author, Adam Croft, to a serious heart condition that he was not aware he had, according to a BBC report.

Croft had been experiencing “little flutterings” of the heart, lightheadedness, and cold sweats the night before the incident he told BBC, though “being a man”, he said, “I thought not much of it and took myself up to bed”.

“It’s not a feature I’d ever expected to use” stated Croft, who told BBC how his Apple Watch led him to call NHS 111, after he received a number of irregular heart rhythm notifications showing signs of atrial fibrillation (AFib) the next morning. Croft added that he would not have called the NHS 111 service, if his Apple Watch had not alerted him.

After contacting emergency services, Croft was advised to visit Bedford Hospital where he was officially diagnosed with AFib, a potentially life-threatening heart condition. Individuals with AFib are at increased risk of having a stroke, and, in some extreme cases, atrial fibrillation can also lead to heart failure according to Mayo Clinic.

Croft, who is now taking blood thinners before he undergoes a cardioversion procedure – a medical treatment that uses quick, low-energy shocks to restore a regular heart rhythm – told BBC, “The watch will be staying on now”.

Apple’s FDA-cleared AFib History feature requires an Apple Watch running watchOS 9.0 or later. Users must wear their Apple Watch for at least 12 hours a day for 5 days a week to consistently receive estimates, and the cardiac health detection feature is not intended for use by people under 22 years of age.