Photo: Jim Smeal/BEImages. I first noticed Sia's relatively new face-shrouding performance ritual when she was the musical guest on a recent episode of SNL. During  Elastic Heart , the singer faced off to the side, a tulle shield obscuring most of her face underneath her signature blonde wig. Sia faced the audience for  Chandelier , but she still wore the same black visor, and a mime performed next to her to draw attention away from the singer.
A cardiac arrest is different to a heart attack. In a cardiac arrest the heart actually stops beating; whereas in a heart attack the heart normally continues to beat even though the blood supply to the heart is disrupted. heart attack occurs when the blood supply to part of the heart stops and thus causes a section of the heart muscle to begin to die; whereas a cardiac arrest occurs when the heart stops beating as a whole. There are various symptoms of a heart attack.
No. The term heart attack is often mistakenly used to describe cardiac arrest. While a heart attack may cause cardiac arrest and sudden death, the terms don't mean the same thing. Heart attacks are caused by a blockage that stops blood flow to the heart. A heart attack (or myocardial infarction) refers to death of heart muscle tissue due to the loss of blood supply, not necessarily resulting in the death of the heart attack victim.