HYPOGLYCEMIA
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Carbohydrates are the main dietary
source of the glucose that is manufactured in the liver and absorbed
into the bloodstream to fuel the body's cells and organs. Glucose
concentration is controlled by hormones, primarily insulin and
glucagon. Glucose concentration is also controlled by epinephrine (adrenalin)
and norepinephrine, as well as growth hormone. If these regulators
are not working properly, levels of blood sugar can become either
excessive (as in hyperglycemia) or inadequate (as in hypoglycemia).
If a person has a blood sugar level of 50 mg/dl or less, he or she
is considered hypoglycemic, although glucose levels vary widely from
one person to another.
Hypoglycemia can occur in several ways.
Drug-induced hypoglycemia
Drug-induced hypoglycemia, a complication of diabetes, is the most
commonly seen and most dangerous form of hypoglycemia.
Hypoglycemia occurs most often in diabetics who must inject insulin
periodically to lower their blood sugar. While other diabetics are
also vulnerable to low blood sugar episodes, they have a lower risk
of a serious outcome than do insulin-dependant diabetics. Unless
recognized and treated immediately, severe hypoglycemia in the
insulin-dependent diabetic can lead to generalized convulsions
followed by amnesia and unconsciousness. Death, though rare, is a
possible outcome.
In insulin-dependent diabetics, hypoglycemia known as an insulin
reaction or insulin shock can be caused by several factors. These
include overmedicating with manufactured insulin, missing or
delaying a meal, eating too little food for the amount of insulin
taken, exercising too strenuously, drinking too much alcohol, or any
combination of these factors.
Ideopathic or reactive hypoglycemia
Ideopathic or reactive hypoglycemia (also called postprandial
hypoglycemia) occurs when some people eat. A number of reasons for
this reaction have been proposed, but no single cause has been
identified.
In some cases, this form of hypoglycemia appears to be associated
with malfunctions or diseases of the liver, pituitary, adrenals,
liver, or pancreas. These conditions are unrelated to diabetes.
Children intolerant of a natural sugar (fructose) or who have
inherited defects that affect digestion may also experience
hypoglycemic attacks. Some children with a negative reaction to
aspirin also experience reactive hypoglycemia. It sometimes occurs
among people with an intolerance to the sugar found in milk (galactose),
and it also often begins before diabetes strikes later on.
Fasting hypoglycemia
Fasting hypoglycemia sometimes occurs after long periods without
food, but it also happens occasionally following strenuous exercise,
such as running in a marathon.
Other factors sometimes associated with hypoglycemia include:
Pregnancy
A weakened immune system
A poor diet high in simple carbohydrates
Prolonged use of drugs, including antibiotics
Chronic physical or mental stress
Heartbeat irregularities (arrhythmias)
Allergies
Breast cancer
High blood pressure treated with beta-blocker medications (after
strenuous exercise)
Upper gastrointestinal tract surgery. |
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