Amy Winehouse has reportedly been diagnosed with an irregular heartbeat after collapsing at her home.

The troubled singer was rushed to hospital on Monday after allegedly fainting.

Now her family fear that this could be her last chance to ween herself off crack and heroin - and potentially save herself from an early grave.

"She’ll be in there for a while if her family get their way," says a source.

"There is a feeling they can have a good crack at sorting her out this time."

An irregular heartbeat can be associated with excessive drug use and puts the sufferer at risk of suffering a heart attack.

 As the Sun's doctor-on-call explains: "Crack narrows blood vessels and raises pressure. It is toxic to the heart muscle, causing an irregular beat.

"A heart attack is one of the most common ways for the drug to kill. But if Amy’s lucky, she’ll feel much better in 48 hours."

Insiders say that Amy's family have discussed getting her sectioned if she tries to leave the London clinic where is currently being treated.