A charity has warned that people could be risking their lives by believing that scenes of heart attacks depict reality.
The British Heart Foundation (BHF) said that signs of a heart attack can be far more subtle than the scenes of people collapsing shown on screen.
The BHF found that 38% of more than 2,000 people questioned got information about heart attacks from TV and films and only 6% had discussed the issue with their GP. Around one in five did not know what heart attack symptoms were.
Each year almost 250,000 people in the UK suffer a heart attack with a third dying before reaching hospital. The BHF said this is often because they do not seek help quickly enough.
Marian Sherry, 61, who had a heart attack, said: "I was surprised to find out I'd had a heart attack because they always show people on television shows like Coronation Street keeling over.
"I just had a tight feeling across my chest and some pain up my arms but fortunately I got help in time."
The BHF is screening new advert - Watch Your Own Heart Attack - on ITV1 next Sunday at 9.17pm.