Brain atrophy is shrinking of the brain caused by the loss of its cells, called neurons.Two types of brain atrophy can occur; generalized and focal. Generalized atrophy refers to neuron loss throughout the entire brain, and focal atrophy refers to neuron loss in a specific brain region.rain atrophy is shrinking of the brain caused by the loss of its cells, called neurons.
A cardiac arrest occurs when your heart suddenly stops beating. The heart functions through electrical pulses, and when those pulses are interrupted it can cause an irregular heartbeat or cardiac arrest. The cause of cardiac arrest is an electrical problem. It does not have anything to do with your arteriesâ functions. cardiac arrest occurs when your heart suddenly stops beating. The heart functions through electrical pulses, and when those pulses are interrupted it can cause an irregular heartbeat or cardiac arrest. The cause of cardiac arrest is an electrical problem. It does not have anything to do with your arteriesâ functions.
1 Most cases of sudden cardiac arrest occur in people who have coronary artery disease. In coronary artery disease, your arteries become clogged with cholesterol and other deposits, reducing blood flow to your heart. This can make it harder for your heart to conduct electrical impulses smoothly.  Heart attack.