The condition can go undetected for years but can cause strokes
A hidden heart condition affecting thousands of Brits could prove fatal without warning. Yet your smartwatch may be the first to detect it.
Medical professionals say wearable technology can identify subtle alterations in your heart rhythm well before any symptoms emerge, potentially avoiding life-threatening complications such as stroke. GP Dr Shireen Emad said: “Smartwatches sit on a spectrum, but one of the most clinically useful things they can do is detect irregular heart rhythms, such as atrial fibrillation (AF).”
AF influences how the heart functions and can have severe repercussions if it remains undetected. It happens when the heart beats with an irregular and frequently rapid rhythm, preventing it from pumping blood efficiently. The risk is that many individuals experience no clear symptoms, meaning the condition can remain undiagnosed for years.
“So many people might have atrial fibrillation and they don’t know that they’ve got it until they’ve had a stroke,” Dr Shireen stated. “In atrial fibrillation, the heart doesn’t pump properly. Instead of pushing blood through, it sort of quivers and the blood can pool and clot.”
These clots can subsequently travel to the brain, substantially raising the likelihood of stroke. “If we pick it up early we can start treatment like blood thinners, which can reduce that risk,” she added. Unlike a single ECG examination, smartwatches track your heart constantly, making them far more likely to identify irregular rhythms over extended periods.
“You can do an ECG at one moment and miss it, because some people dip in and out of atrial fibrillation,” Dr Shireen explained. “A smartwatch tracks your baseline and can pick up when something suddenly changes.”
While these gadgets cannot replace a medical diagnosis, they can serve as an early alert mechanism. “They’re not giving you medical-grade insight but they are very good at spotting patterns and flagging when something isn’t right,” she informed Watches2U.
AF warning signs to look out for – and your next steps
Although atrial fibrillation can present no symptoms, some may experience a racing or erratic heartbeat, palpitations, breathlessness, tiredness or light-headedness. Nevertheless, Dr Shireen emphasises that even without symptoms, notifications from a wearable gadget ought to be treated seriously.
“I would always advise speaking to your GP if your watch flags something unusual,” she said. “We don’t expect patients to interpret this data themselves, but it can be a really helpful prompt to get checked.”
Dr Shireen continued: “Smartwatches are not there to replace doctors but they can play an important role in picking things up early, and in some cases, that can be life-saving.”


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