Hypoglycemia
|
Symptoms
|
What
are the key symptoms?
The tumours are associated with
episodes of low blood sugar (hypoglycemia) that can cause an array of symptoms.
Low blood sugar levels can affect
the central nervous system (the brain) causing episodes or attacks of
confusion, panic attacks, and even personality change.
The insulin producing tumours can
also affect the autonomic nervous system (that controls many of the organs,
muscles, and systems in the body, such as heart rate) causing palpitations, sweating
and a trembly feeling.
Patients with an insulinoma will
find eating or drinking something sugary can quickly alleviate their symptoms.
Low
blood sugar levels caused by the tumour can trigger:
- Confusion, anxiety, personality
disorders and even aggressiveness
- Rapid heartbeat, sweating,
palpitations, feelings of hunger, dizziness and drowsiness. You may look
pale, (or grey if you have a dark skin), have a headache feel irritable,
feel faint and suddenly weak
- If blood sugar drops very low
or very suddenly it is possible to lose consciousness and it can even lead
to seizures (fits)
·
What is an insulinoma?
·
Insulinomas
are rare type of functional neuroendocrine tumours with an incidence estimated
at 1 to 4 new cases per million persons per year. They are called functional
because they produce insulin and cause blood sugar levels, to drop.
·
Insulinoma
is one of the most common types of tumour arising from the islets of Langerhans
cells (pancreatic endocrine tumours).
·
Estimates
of malignancy (metastases) range from 5% to 30%. Over 99% of insulinomas
originate in the pancreas, with rare cases from ectopic pancreatic tissue.
·
About
5% of cases are associated with tumours of the parathyroid glands and the
pituitary (Multiple endocrine neoplasia type 1) and are more likely to be
multiple and malignant. Most insulinomas are small, less than 2 cm.
·
The most
common symptoms of insulinomas are confusion, sweating, dizziness, weakness and
relief with eating. These symptoms are caused by low blood sugar known as
hypoglycemia.
·
There can
often be a delay in the diagnosis due to the vague and varied symptoms that
these tumours can cause.
·
Most
insulinomas are solitary and benign and therefore surgical resection can often
result in a cure, but there is a proportion of insulinomas that become
malignant so it is vital that the correct diagnostic techniques are used.
·
The role of the pancreas
·
In a healthy
person the pancreas produces both insulin and glucagon. When blood sugar rises
after a meal, beta cells in the pancreas release insulin. This helps sugar from
food to enter the blood cells and lowers levels of glucose to normal.
·
If blood
sugar falls too low then alpha cells in the pancreas produce glucagons that
triggers the liver to release glycogen. This is converted into blood glucose,
thereby lifting levels of blood sugar to normal.
·
What is known about insulinomas?
·
In most cases
a single tumor develops in the beta cells (the insulin producing cells) within
the pancreas. In a very small number of cases (1-3%) the tumour will develop in
insulin producing cells that have 'escaped' into the abdomen. The reason why
tumours form is not yet fully understood. They may be present form many years
prior to diagnosis as the symptoms they cause may be confused with other
conditions.
Signs and symptoms
Hypoglycemic symptoms and manifestations can be
divided into those produced by the counterregulatory hormones (epinephrine/adrenaline and glucagon) triggered by the falling glucose, and the
neuroglycopenic effects produced by the reduced brain sugar.
[edit] Adrenergic manifestations
- Shakiness, anxiety, nervousness
- Palpitations, tachycardia
- Sweating, feeling
of warmth (although sweat glands have muscarinic receptors, thus
"adrenergic manifestations" is not entirely accurate)
- Pallor, coldness,
clamminess
- Dilated pupils (mydriasis)
- Feeling of numbness "pins and needles" (paresthesia)
[edit] Glucagon manifestations
[edit] Neuroglycopenic manifestations
- Abnormal mentation, impaired judgment
- Nonspecific dysphoria, moodiness, depression,
crying, exaggerated concerns
- Negativism, irritability, belligerence,
combativeness, rage
- Personality change, emotional lability
- Fatigue, weakness, apathy, lethargy, daydreaming, sleep
- Confusion, amnesia,
dizziness, delirium
- Staring, "glassy" look, blurred
vision, double
vision
- Flashes of light in the field of vision
- Automatic behavior, also known as automatism
- Difficulty speaking, slurred speech
- Ataxia,
incoordination, sometimes mistaken for "drunkenness"
- Focal or general motor deficit, paralysis, hemiparesis
- Paresthesia, headache
- Stupor, coma, abnormal breathing
- Generalized or focal seizures
Tips on how to manage Hypoglycemia
Hypoglycemia, or hypo, is the
medical term for low blood glucose levels – that is a blood glucose level of
less than 4 mmol/l. This is too low to provide enough energy for your body’s
activities. Hypos are one of the most common symptoms of having an insulinoma.
It is caused because the insulinoma produces insulin.
What causes a hypo? A hypo can be
caused by the following:
· too
much insulin
· a
delayed or missed meal or snack
· not
enough food containing carbohydrate
· Unplanned
or strenuous activity
· drinking
too much alcohol or alcohol without food
· sometimes
there is no obvious cause
Signs of a mild hypo
Most people have some warning signs
when their blood glucose level starts to go low. These include:
· feeling
hungry
· trembling
or shakiness
· sweating
· anxiety
or irritability
· going
pale (grayish complexion if you are Black)
· fast
pulse or palpitations
· tingling
of the lips
· blurred
vision.
Signs of a more severe hypo
· difficulty
in concentrating
· vagueness
or confusion
· irrational
behavior.
Immediate treatment
Once you notice your hypo warnings, take action quickly or it is likely to become more severe, and you may become unconscious or have a fit. Immediately treat with a 10-20g of a short-acting carbohydrate such as:
Once you notice your hypo warnings, take action quickly or it is likely to become more severe, and you may become unconscious or have a fit. Immediately treat with a 10-20g of a short-acting carbohydrate such as:
· a
glass of Lucozade or non-diet drink
· three
or more glucose tablets
· five
sweets, eg jelly babies
· a
glass of fruit juice
The exact quantity will vary from
person to person.
· If
your hypo is more severe and you cannot treat it yourself, someone else can
help you by: applying GlucoGel (or treacle, jam or honey) on the inside of your
cheeks and gently massaging the outside of your cheeks.
· If
you are unconscious, Glucagon can be injected if the person you are with has
been trained to use it. Otherwise the people you are with should call an ambulance
immediately.
Important: If you are unable to
swallow or unconscious, you should not be given anything by mouth (including
GlucoGel, treacle, jam or honey). Make sure your family and friends are aware
of this. If you are unconscious, you should be placed in the recovery position
(on your side with your head tilted back) so that your tongue does not block
your throat.
Follow-on treatment
To prevent your blood glucose levels dropping again, you should follow your sugary foods with 10-20g of a longer-acting carbohydrate such as:
To prevent your blood glucose levels dropping again, you should follow your sugary foods with 10-20g of a longer-acting carbohydrate such as:
· half
a sandwich
· fruit
· a
small bowl of cereal
· biscuits
and milk
· the
next meal if due.
The exact quantity will vary from
person to person.
Hypos at night
If you are concerned about night-time hypos, check your blood glucose between 2am and 3am when hypos are most likely to happen. Keep something sugary by your bed just in case. Alternatively have a snack before bed-time such as biscuits and milk, half a sandwich, fruit or yoghurt. If you blood glucose is low before going to bed ensure that you eat to raise your levels.
If you are concerned about night-time hypos, check your blood glucose between 2am and 3am when hypos are most likely to happen. Keep something sugary by your bed just in case. Alternatively have a snack before bed-time such as biscuits and milk, half a sandwich, fruit or yoghurt. If you blood glucose is low before going to bed ensure that you eat to raise your levels.
Hypos and physical activity
Physical activity lowers your blood glucose level so it is important to eat some form of carbohydrate before, possibly during and after your activity especially if it is strenuous or lasts a long time. Hypos can happen up to 36 hours after strenuous or prolonged physical activity so you might need to adjust your medication or carbohydrate intake to compensate.
Physical activity lowers your blood glucose level so it is important to eat some form of carbohydrate before, possibly during and after your activity especially if it is strenuous or lasts a long time. Hypos can happen up to 36 hours after strenuous or prolonged physical activity so you might need to adjust your medication or carbohydrate intake to compensate.
Hypos and driving
Always test your blood glucose levels before driving. If you feel you may be going hypo, pull over, stop the car as soon as it is safe to do so and remove the keys from the ignition. Leave the driving seat and treat your hypo in the usual way. Do not attempt to start driving again until you are sure your blood glucose levels have risen again.
Always test your blood glucose levels before driving. If you feel you may be going hypo, pull over, stop the car as soon as it is safe to do so and remove the keys from the ignition. Leave the driving seat and treat your hypo in the usual way. Do not attempt to start driving again until you are sure your blood glucose levels have risen again.
Hypos and alcohol
Drinking a lot of alcohol or drinking on an empty stomach makes a hypo more likely to occur. The outwards signs of a hypo are also very similar to those of being drunk. Always have something to eat if you are drinking alcohol, and tell the people you are with about your diabetes and what to do if you need help treating a hypo.
Drinking a lot of alcohol or drinking on an empty stomach makes a hypo more likely to occur. The outwards signs of a hypo are also very similar to those of being drunk. Always have something to eat if you are drinking alcohol, and tell the people you are with about your diabetes and what to do if you need help treating a hypo.
Important points to remember:
· Always
have something sugary with you for use in an emergency.
· Wear
some medical I.D.
· Tell
your friends or family what signs you have when you go hypo and how to treat
it, as you may not be able to think clearly when your blood glucose goes low.
· You
will come to recognise your own hypo warning signs, but these may change over
time, so be prepared to check your blood glucose level if you experience any
unusual symptoms.
This information is from 9825/0110/a
©Diabetes UK 2010 it was produced in relation to hypos for diabetics. It has
been reproduced here as it is perhaps the best advice currently available for
managing and treating hypoglycemia for those with an insulinoma.
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