Diabetes is a disease that affects the
way the body produces and uses insulin. Basal-bolus insulin therapy is a way of managing this condition. In type 2 diabetes, both the
production and use of insulin are affected.
In people without diabetes, insulin is
produced by the pancreas to keep the body's blood glucose levels
under control throughout the day.
The pancreas produces enough insulin,
whether the body is active, resting, eating, sick, or sleeping. This
allows people without diabetes to eat food at any time of the day,
without their blood sugar levels changing dramatically. For people
with diabetes, this doesn't happen. However, a similar level of
blood sugar control can be achieved by injecting insulin.
Injections can be used throughout the
day to mimic the two types of insulin: basal and bolus. People
without diabetes produce these throughout the day and at mealtimes,
respectively
What is a basal-bolus insulin regimen?
A basal-bolus insulin regimen involves a person with diabetes taking
both basal and bolus insulin throughout the day. It offers them a
way to control their blood sugar levels. It helps achieve levels
similar to a person without diabetes.
There are several advantages to using a
basal-bolus insulin regimen. These include:
- flexibility as to when to have meals
- control of blood sugar levels overnight
- they are helpful for people who do shift work
- they are helpful if traveling across different time zones
The downsides to a basal-bolus regimen
are that:
- people may need to take up to 4 injections a day
- adapting to this routine can be challenging
- it can be hard to remember to take the injections
- it can be hard to time the injections
- it's necessary to keep a supply of insulin with you
These things can make it harder to
manage diabetes well. To make it easier, some experts suggest
introducing the regimen gradually. When this happens, bolus insulin
is taken, beginning with just one meal at a time.
What is basal insulin? Basal insulin
is also sometimes known as "background insulin." It is
usually taken once or twice a day to keep blood sugar levels
consistent. This is important when the body is releasing glucose to
supply cells with energy, during fasting.
By keeping sugar levels steady during
fasting, basal insulin allows the cells to change sugar into energy
more easily. Basal insulin makes up about half of the total amount
of daily insulin. It is sometimes called "long-acting insulin"
because it needs to be effective for a long time.
Examples of long-acting basal insulin
for people with diabetes include:
- glargine (Lantus)
- detemir (Levemir)
These insulins reach the bloodstream
several hours after injection and are effective for up to 24 hours.
However, people using these treatments will also need to use
rapid-acting insulin when they eat. This applies for people with type
2 diabetes.
As well as using long-acting basal
insulin, some people with type 2 diabetes may need to take oral
medication. In addition, they may need a weekly injection of a
medicine called a "GLP-1 agonist".
What is bolus insulin? People with
diabetes take bolus insulin at meal times, to keep blood sugar levels
under control after eating.
Bolus insulin needs to act quickly, and
so is known as "short-acting" or "rapid-acting"
insulin. It works in about 15 minutes, peaks in about 1 hour, and
continues to work for 2 to 4 hours.
Brands of rapid-acting bolus insulins
include:
- NovoRapid
- Humalog
- Apidra
Bolus insulin needs to reflect the
amount of food eaten during a meal. So, carbohydrate counting and
insulin-to-carbohydrate ratios are important tools for people with
diabetes who use. However, some people find it easier to use an
"insulin scale" instead.
An insulin scale is a list of how much
insulin should be given before a meal. It takes into account both
the pre-meal blood sugar level and the amount of carbohydrate that
would usually be eaten at that meal.
However, it is still important for
people using insulin scales to think about the dose of insulin they
will take. They should compare it to the amount of food they are
eating and what activities they have planned for after they eat.
This is because if they are going to
eat more than usual then they may need more insulin than is listed on
the scale. Or, they may need less insulin than is listed on the
scale if they are planning on being more active than usual that day.
Insulin for people with diabetes is
usually injected. However, in recent years, some alternatives to
syringe injections have become available.
One alternative to injections is
insertion aids, which are spring-loaded devices with a shielded
needle. Insertion aids release insulin at the simple touch of a
button.
Infusers are another option. An
infuser is a device containing a needle or catheter (a flexible
plastic tube) that remains under the skin for up to 72 hours.
When a person needs to administer
insulin, they inject the insulin directly into the infuser, rather
than into the skin. This method reduces the number of times they
would need to insert a needle into their skin.
Yet, another method is the use of jet
injectors. This does not use needles. Instead, a thin, high-pressure
stream of insulin is forced through the skin.
Although jet injectors do not involve
needles, the pressure can cause bruising.
Insulin can also be delivered using
insulin pumps, if you can afford them. These are small, computerized
devices that provide a steady, measured, and continuous dose of basal
insulin, or a surge of bolus insulin at mealtimes. The insulin is
delivered through a catheter that is taped in place on the skin.