Brain ischemia (aka cerebral ischemia, cerebrovascular ischemia) is a condition in which there is insufficient blood flow to the brain to meet metabolic demand.This leads to poor oxygen supply or cerebral hypoxia and thus to the death of brain tissue or cerebral infarction / ischemic stroke.ther effects that may result from brain ischemia are stroke, cardiorespiratory arrest, and irreversible brain damage. An interruption of blood flow to the brain for more than 10 seconds causes unconsciousness, and an interruption in flow for more than a few minutes generally results in irreversible brain damage.
A. If the heartbeat is too slow, usually considered a rate below 60 beats a minute, not enough oxygen-rich blood flows through the body. The symptoms of a slow heartbeat are:
What Is Bradycardia, or Slow Heartbeat? Bradycardia is a heartbeat of less than 60 beats per minute. In most healthy people, a normal heart rate is 60 to 100 beats per minute (BPM). Although a resting heart rate below 60 beats is considered bradycardia, it doesnât always signal a problem. What counts as an abnormally slow heartbeat for one person may not be the same for another. It can be affected by age and physical condition. Athletic adults can have a heart rate below 60 BPM, and that is normal for them. Your heart rate may fall below 60 BPM when you sleep but still be normal.