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.
SUDDEN CARDIAC ARREST (SCA) According to the Mayo Clinic, sudden cardiac arrest is the sudden, unexpected loss of heart function, breathing, and consciousness. Sudden cardiac arrest usually results from an electrical disturbance in your heart that disrupts its pumping action, stopping blood flow to the rest of your body.