A shortage of defibrillators - which shock the heart - and a lack of public awareness could be costing thousands of lives every year, research suggests.
Experts found that fewer than 2% of heart attack victims in one county in England were treated with the device before an ambulance arrived - a figure described as "disappointingly low".
The British Heart Foundation (BMF) estimates that 60,000 heart attacks occur out of hospital every year across the UK.
More top news
The American Airlines plane caught fire at Chicago O'Hare airport, prompting an evacuation of the plane.
As the number of people sleeping rough in England increases significantly, a new bill aimed at cutting homeless has passed a second reading.
With the Calais "Jungle" camp having been "cleared" by French authorities, many migrant teenagers are now heading to Paris.