|
|
|
What
is hypoglycemia?
When
blood glucose drops below normal levels, it is called
hypoglycemia. Glucose, an important source of energy for the body,
comes from food. Carbohydrates are the main dietary source of
glucose. Rice, potatoes, bread, tortillas, cereal, milk, fruit,
and sweets are all carbohydrate-rich foods.
After
a meal, glucose is absorbed into the bloodstream and carried to
the body’s cells. Insulin is a hormone that helps glucose
conversion to energy in cells. If a person takes in more glucose
than the body needs at the time, the body stores the extra glucose
in the liver and muscles in a form called glycogen. The body can
use glycogen for energy between meals. Extra glucose can also be
changed to fat and stored in fat cells. Fat can also be used for
energy.
When
blood glucose begins to fall, glucagon—another hormone made by
the pancreas—signals the liver to break down glycogen and
release glucose into the bloodstream. Normal levels then ensue. In
some people with diabetes, this glucagon response to hypoglycemia
is impaired and other hormones such as epinephrine, also called
adrenaline, may raise the blood glucose level. But with diabetes
treated with insulin or pills that increase insulin production,
glucose levels can’t easily return to the normal range.
Hypoglycemia
can happen suddenly. It is usually mild and can be treated quickly
and easily by eating or drinking a small amount of glucose-rich
food. Confusion, clumsiness, and fainting occur when it is left
untreated. Severe hypoglycemia can lead to seizures, coma, and
even death.
In
adults and children older than 10 years, hypoglycemia is uncommon
except as a side effect of diabetes treatment. Hypoglycemia can
also result, however, from other medications or diseases, hormone
or enzyme deficiencies, or tumors.
Some
symptoms of hypoglycemia are:
Hypoglycemia
can also happen during sleep. Sleep signs are:
Diabetes
Medications
Hypoglycemia
can occur as a side effect of some diabetes medications, including
insulin and oral diabetes medications—pills—that increase
insulin production, such as
Other
Causes of Hypoglycemia
With
people using insulin and pills, blood glucose levels that are low
can be because of:
How
can hypoglycemia be prevented?
Diabetes
treatment plans are designed to match the dose and timing of
medication to a person’s usual schedule of meals and activities.
Bad matches can be become hypoglycemia. For example, taking a dose
of insulin—or other medication that increases insulin levels—but
then skipping a meal could result in hypoglycemia.
To
help prevent hypoglycemia, people with diabetes should always
consider the following:
What
to Ask the Doctor about Diabetes Medications
These
are things you should ask your doctor:
Different
people have different symptoms and signs of hypoglycemia. People
with diabetes should get to know their signs and symptoms and
describe them to their friends and family so they can help if
needed. School staff should be told how to recognize a child’s
signs and symptoms of hypoglycemia and how to treat it.
People
who experience hypoglycemia several times in a week should call
their health care provider. Treatment plans may need to be
changed: less medication or a different medication, a new schedule
for insulin or medication, a different meal plan, or a new
physical activity plan.
Prompt
Treatment for Hypoglycemia
Blood
glucose meters need to be checked if you think the blood sugar is
too low. If the level is below 70 mg/dL, one of these quick-fix
foods should be consumed right away to raise blood glucose:
Recommended
amounts may be less for small children. The child’s doctor can
advise about the right amount to give a child.
Recheck
your blood sugar in fifteen minutes to make sure it is 70 mg/dL or
above. If it’s still too low, another serving of a quick-fix
food should be eaten. These steps should be repeated until the
blood glucose level is 70 mg/dL or above. If the next meal is an
hour or more away, a snack should be eaten once the quick-fix
foods have raised the blood glucose level to 70 mg/dL or above.
Help
from Others for Severe Hypoglycemia
Severe
hypoglycemia—very low blood glucose—can cause a person to pass
out and can even be life threatening. Severe hypoglycemia is more
likely to occur in people with type 1 diabetes. People should ask
a health care provider what to do about severe hypoglycemia.
Another person can help someone who has passed out by giving an
injection of glucagon. Glucagon will rapidly bring the blood
glucose level back to normal and help the person regain
consciousness. A glucogen emergency kit can be prescribed by your
doctor. Family, friends, or coworkers—the people who will be
around the person at risk of hypoglycemia—can learn how to give
a glucagon injection and when to call 911 or get medical help.
Physical
Activity and Blood Glucose Levels
Lowering
blood sugar is a benefit of exercise. However, physical activity
can make levels too low and can cause hypoglycemia up to 24 hours
afterward. A health care provider can advise about checking the
blood glucose level before exercise. For those who take insulin or
one of the oral medications that increase insulin production, the
health care provider may suggest having a snack if the glucose
level is below 100 mg/dL or adjusting medication doses before
physical activity to help avoid hypoglycemia. A snack can prevent
hypoglycemia. Your doctor may want you to check your blood sugar
more often.
Hypoglycemia
When Driving
Hypoglycemia
is particularly dangerous if it happens to someone who is driving.
People with hypoglycemia may have trouble concentrating or seeing
clearly behind the wheel and may not be able to react quickly to
road hazards or to the actions of other drivers. Check your
glucose levels before driving if you have hypoglycemia. During
longer trips, they should check their blood glucose level
frequently and eat snacks as needed to keep the level at 70 mg/dL
or above. If necessary, they should stop for treatment and then
make sure their blood glucose level is 70 mg/dL or above before
starting to drive again.
Hypoglycemia
Unawareness
Hypoglycemia
unawareness is low blood sugar for diabetics, and some have no
symptoms of it. This condition occurs most often in people with
type 1 diabetes, but it can also occur in people with type 2
diabetes. People with hypoglycemia unawareness may need to check
their blood glucose level more often so they know when
hypoglycemia is about to occur. They also may need a change in
their medications, meal plan, or physical activity routine.
Hypoglycemia
unawareness develops when frequent episodes of hypoglycemia lead
to changes in how the body reacts to low blood glucose levels.
When blood glucose is too low, the body stops releasing the
hormone epinephrine. The loss of the body’s ability to release
stress hormones after repeated episodes of hypoglycemia is
called hypoglycemia-associated autonomic failure,
or HAAF.
Epinephrine
causes early warning symptoms of hypoglycemia such as shakiness,
sweating, anxiety, and hunger. Without the release of epinephrine
and the symptoms it causes, a person may not realize that
hypoglycemia is occurring and may not take action to treat it.
When frequent hypoglycemia leads to HAAF and hypoglycemia a
vicious cycle can occur, which in turn leads to even more severe
and dangerous hypoglycemia. Studies have shown that preventing
hypoglycemia for a period as short as several weeks can sometimes
break this cycle and restore awareness of symptoms. Health care
providers may therefore advise people who have had severe
hypoglycemia to aim for higher-than-usual blood glucose targets
for short-term periods.
Being
Prepared for Hypoglycemia
People
who use insulin or take an oral diabetes medication that can cause
low blood glucose should always be prepared to prevent and treat
low blood glucose by
telling
their family, friends, and coworkers about the symptoms of
hypoglycemia and how they can help if needed
Diabetics
get these two types of hypoglycemia:
Symptoms
of both reactive and fasting hypoglycemia are similar to
diabetes-related hypoglycemia. Symptoms may include hunger,
sweating, shakiness, dizziness, light-headedness, sleepiness,
confusion, difficulty speaking, anxiety, and weakness.
Laboratory
tests are used by doctors to determine the cause of hypoglycemia.
Diabetes-related
Hypoglycemia
Hypoglycemia
Unrelated to Diabetes
|
Compliments
of Kshamica Nimalasuriya MD, MPH
Preventive
Medicine & Public Health