Bollywood superstar Sridevi Kapoor, considered by many to be one of the biggest names in Hindi cinema, has died after suffering a cardiac arrest in Dubai, at only 54 years.

Anyone who knew the veteran actress would tell you that she was extremely fit and her sudden demise came as a shock to many.

Now, the point to be noted is that she suffered a cardiac arrest and not a heart attack.

A heart attack occurs when a blocked artery prevents oxygen-rich blood from reaching a section of the heart. If not re-opened quickly, that part of the heart starts dying.

Cardiac arrest occurs suddenly and often without warning. It is triggered by an electrical malfunction in the heart that causes an irregular heartbeat. The heart cannot pump blood to the brain, lungs and other organs and the person loses consciousness. 

Sridevi was rumoured to have gone under the knife several times. Botox treatments, lip-jobs, etc. she's done them all. While it is a personal choice, it seems these operations could've added to a higher stress level in her body, which culminated in a weak heart and eventually a cardiac arrest.