Sudden Cardiac Arrest: What will you do if the person next to you collapses?

As soon as I asked this question, I could see nervous smiles in the audience yearning for an answer from me.  Most of the times sudden collapse is due to SCA, a condition where electrical impulses of the heart become  rapid, chaotic and subsequently, this causes the heart to stop effective beating.

Blood supply to brain is reduced / stopped leading to unconsciousness. Over 90% of the SCA incidents happen at the workplace or home, and victims have absolutely no symptoms to indicate the onset of SCA. Less than 30% of these victims receive timely care.