Irreversible brain death usually occurs with 6-10 minutes after cardiac arrest. however some individuals that?
The cold slows the metabolism of the brain cells, so they don't need a lot of oxygen. As long as they receive the oxygen as the body is warmed up again, there is a good chance of avoiding damage.
I have PREMATURE VENTRICULAR CONTRACTIONS (skipped heart beats) . . .?
http://www.medicinenet.com/premature_ventricular_contractions/article.htm Premature ventricular contractions in healthy individuals without high blood pressure and heart diseases do not pose any health risks. Premature ventricular contractions in patients with heart diseases (heart attacks, heart failure, diseases of the heart valves) are associated with increased risks of developing ventricular tachycardia. Ventricular tachycardia is a sustained run of rapid ventricular contractions. Ventricular tachycardia is life-threatening because: 1) it occurs suddenly with no prior warning, and 2) it frequently develops into ventricular fibrillation. Ventricular fibrillation is a chaotic rhythm where the ventricles quiver rapidly in a purposeless fashion. The heart with ventricular fibrillation cannot pump blood effectively to the brain and the rest of the body. If untreated, ventricular fibrillation can be fatal within minutes. An estimated 250,000 Americans die in this way each year. http://www.energyfiend.com/the-caffeine-database/ long list of products and caffeine content