How fast does sudden cardiac arrest cause unconsciousness?
Here's video of Salamanca soccer player Miguel Garcia's episode. At the start of the video, Mr. Garcia can be seen in the background of the image kneeling behind the players in the foreground. Watch carefully as he stands after tying his shoes.
Although it is difficult to see, it appears an automatic external defibrillator arrives in about 2 minutes, though given the fact his shirt is still on as he's taken from the field, we note the device is on his gurney as he's hurried to a nearby ambulance. Reportedly, he survived this sudden cardiac arrest event.
This was NOT a heart attack, but rather an loss of cardiac function caused by a rapid, often disorganized heart rhythm disorder. Compare the relatively long time to resuscitation using an external automatic defibrillator verses the very rapid response afforded to Belgian soccer player Anthony Van Loo whose internal defibrillator was already installed before he played as primary prevention of sudden death from right ventricular dysplasia.
h/t: Electrophysiology Fellow blog