-07-18
病理生理:
Like most animal tissues, braindepends primarily on glucose for fuel in most circumstances. A limited amount of glucose can be derived fromstored in, but it is consumed within minutes. For most practical purposes, the brain is dependent on a continual supply of glucose diffusing from the blood into the interstitial tissue within theand into thethemselves.
Therefore, if the amount of glucose supplied by the blood falls, the brain is one of the first organs affected. In most people, subtle reduction of mental efficiency can be observed when the glucose falls below 65mg/dl (3.6 mM). Impairment of action and judgment usually becomes obvious below 40mg/dl (2.2 mM). Seizures may occur as the glucose falls further. As blood glucose levels fall below 10mg/dl (0.55 mM), most neurons become electrically silent and nonfunctional, resulting in. These brain effects are collectively referred to as.
The importance of an adequate supply of glucose to the brain is apparent from the number of nervous, hormonal and metabolic responses to a falling glucose level. Most of these are defensive or adaptive, tending to raise the blood sugar viaandor provide alternative fuels. If the blood sugar level falls too low the liver converts a storage of glycogen into glucose and releases it into the bloodstream, to prevent the person going into a, for a short period of time.
Brief or mild hypoglycemia produces no lasting effects on the brain, though it can temporarily alter brain responses to additional hypoglycemia. Prolonged, severe hypoglycemia can produce lasting damage of a wide range. This can include impairment of cognitive function, motor control, or even consciousness. The likelihood of permanent brain damage from any given instance of severe hypoglycemia is difficult to estimate, and depends on a multitude of factors such as age, recent blood and brain glucose experience, concurrent problems such as, and availability of alternative fuels. It has been frequently found that those Type 1 diabetics found 'dead in bed' in the morning after suspected severe hypoglycemia had some underlying coronary pathology that led to an induced fatal heart attack. Recently, several of these individuals found 'dead in bed' were wearing Continuous Glucose Monitors, which provided a history of glucose levels prior to the fatal event. It has been found in several cases, that the fatal event was preceded by at least two hours of blood glucose levels under 40mg/dl, possibly lower as the continuous glucose monitors are not accurate at levels below 40mg/dl. The individuals failed to respond to the audible alarms produced by the continuous glucose monitor which may have been 'alarming' for many hours prior to the fatal event. The vast majority of symptomatic hypoglycemic episodes result in no detectable permanent harm.
如果觉得《低血糖症抢救流程》对你有帮助,请点赞、收藏,并留下你的观点哦!