PANJIM, June 1 -- When everyone these days is talking about COVID-19 and its medical effects on the body, readers may think that this article deals with the virus. Not altogether! The reason I am broaching this subject is that in the last three months I lost three of my good friends who, though not harbouring the coronavirus, died suddenly.

Warning signs: Cardiac arrest, sometimes called sudden cardiac arrest, means that your heart suddenly stops beating. This cuts off blood flow to the brain and other organs. It's an emergency. Cardiac arrest is quick and drastic: You suddenly collapse, lose consciousness, have no pulse, and aren't breathing. But right before it happens, you could be very tired, dizzy, weak, short of breath, or sick to yo...