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:
Resting heart rate, or pulse, refers to the number of times your heart beats per minute when you are at rest. Though a normal range is 50 to 100, most peopleâs hearts beat 60 to 80 times a minute. Above 100 is considered a rapid pulse, called tachycardia; an unusually slow resting heart rate is called bradycardia.Resting heart rate varies from person to person and over the course of the day, due to genetics and other factors.bove 100 is considered a rapid pulse, called tachycardia; an unusually slow resting heart rate is called bradycardia. Resting heart rate varies from person to person and over the course of the day, due to genetics and other factors.