By Dr Morrison
In this section I aim to give you information on what you need to know to use insulin to keep you as well as you would want to be if you didn’t have diabetes.
I will be discussing different sorts of insulins and different sorts of delivery devices. Most basic techniques are covered in your diabetic, but here I want to help you take things further. I want to try to help you get the best match possible to cover your daily rhythms and food intake.
As in most of this course, self experimentation is the key. Various techniques are described and you have to decide if you would like to use this technique to control your blood sugars or not. You then need to change what you do in a gradual and controlled way. Whenever you are experimenting with new food, exercise, and insulin patterns you need to test more frequently and be prepared to adjust things according to the results you are getting.
I hope that you will have started to count up how much carbohydrate you are eating each day. You may still be seeking some more information before you begin to reduce it and this is okay. Arm yourself with lots of test strips for this section! And let’s begin.
What is Insulin?
Insulin is a big protein made by the beta cells of the pancreas. It controls several functions in the body. The most important ones for diabetics are:
- Insulin tells certain cells to take in sugar from the blood stream and so drops blood sugar levels.
- Insulin tells your liver to reduce the amount of sugar it is making from protein.
- Insulin is a growth hormone.
- Insulin is a fat storage hormone.
- High insulin levels tend to stiffen and age your blood vessels.
In 1922, researchers in Toronto, Banting and Best discovered how to extract insulin from animals to give to humans.
Fine tuning did not really exist until blood monitoring was popularised in the 1980s for all type one diabetics. Since then, genetically-engineered insulin has been produced from yeast and the e coli bacteria which is structurally identical to human insulin.
Different Action Times
Different action times of insulin have been developed by altering the chemical structure of the insulins or by the addition of stabilising substances.
Syringes and vials have been supplemented by pen injectors, pumps, and in the last ten years inhaled and oral insulins.
There are different potencies of insulin with different onsets and durations of action. These are called rapid acting, regular insulin, intermediate acting and slow acting.
In general the total carbohydrate content of a food is a more important consideration than the amount of sugar in it. Whether it is a starch or a sugar that is present the same amount of insulin is needed to deal with it and both types raise your blood sugar pretty fast.
Your major challenge is to carefully match your insulin intake to your carbohydrate intake. There are also factors like exercise, stress and illness to be considered.
Where Do I Inject?
One of the best sites to inject insulin is in your bottom or on the fat pad above your trouser line. These areas usually are quite fatty and tend to hurt the least. You are also most unlikely to mistakenly inject into a muscle.
Other sites that you may use in public are your abdomen or your thighs. You can adjust your clothing or inject through it.
Some people prefer to inject in a washroom and others will be happy to inject at the table in a restaurant or plane.
How Do I Inject Insulin?
If using a vial and syringe the best technique is to draw up the insulin smoothly and quickly and inject it smoothly and quickly. Dr Bernstein has a video of this in his CD series.
If you use a pen you need to leave the needle in and count to ten slowly, “one thousand, two thousand…” etc. Otherwise the insulin tends to leak a bit more than you would like.
Pump users need to change the site anything from daily to every three days. The abdomen and rear trouser line are the most popular. Special hygiene routines are helpful in preventing infection.
If you are using plain needles you don’t need to clean the area with an alcohol swab. You just inject.
The needle depth and fineness can vary. 4, 5, 6, 8 and 12mm needles are available in the UK. If you are pretty thin or using your thighs a smaller needle is often used. If you are fatter or prefer your backside the longer needles are better.
In some circumstances you may want to put the needle into muscle. This could be for the purpose of achieving a more rapid effect which you may want to use if correcting for high blood sugars.
The basal insulin level should be matched to the liver’s normal secretion of sugar. Because the liver tends to produce different amounts of glucose at different times of the day and night the insulin requirement will also vary. The right basal rate is one that keeps your blood sugar at a fairly constant level when you have not eaten or bolused for several hours and are not exercising.
An insulin pump gives the most flexibility over basal insulin dosages at different times of the day.
For people on a multiple daily injection regime the main analogue basal insulins are Lantus and Detemir known in Europe as Levemir. Lantus should not be mixed with other insulins because it depends on its action for its acidic pH. Levemir has 75 percent of the potency of Lantus. It is not acidic and does not sting like Lantus can when it is injected.
Lantus lasts about 22 hours in most people and Levemir lasts about 16. Either insulin can sometimes be given once a day successfully for some individuals, but most people get on better with twice daily injections for both of them. The best time to give them is right before bed and when you get up in the morning. If you have a marked dawn phenomenon no more than a 9 hour gap between the night and morning injection is recommended by Dr Bernstein.
It can take about three days for your blood sugars to stabilise after altering your twice daily basal so it is best to keep changes to three days apart or more so you can get a true reflection of the results of your insulin adjustments.
Older insulins have been stabilised so they last a long time such as the Lente and Ultralente insulins. They are sometimes combined with shorter acting regular insulins so you can reduce the number of daily injections. If you have a cloudy insulin such as this it needs to be mixed thoroughly before injection. Rolling the vial or pen gently up to 20 times is advised.
Your insulin stores can be kept stable for years in a correctly maintained domestic refrigerator, but once out and about insulin needs to be kept at room temperature or a bit cooler to retain its potency.
It can go off rapidly if overheated, e.g. from being left in a car on a hot day. Lantus is particularly fragile and light can affect it too. Lantus lasts in good condition for about three weeks and most others last about four to six weeks. Most insulin manufacturers state that you should replace insulin after four weeks.
When you are going to be in a hot environment you can store your insulin pens and vials in a frio wallet. These are available in the UK from Boots online and amazon.co.uk, and selected pharmacists.
When you travel on a plane you must keep your insulin in your hand luggage. If it goes in the hold it could freeze without you being aware of it and this too will seriously impair its effectiveness.
When you go skiing or out on a very cold day keep your insulin next to your body to prevent freezing too.
Missed a Dose?
If you miss your basal by only a few hours you may simply give it as usual. If you are more than four hours late however the action you take may vary. Let us assume you are awake during the day and sleep at night.
You miss your night basal which you normally give at 10 pm and remember when you get back from the party at 3am.
Check your blood sugar. You are a bit high. Give a proportion of your basal let say half of the usual dose and go to sleep. You probably need to sleep before work tomorrow more than worry about whether any correction dose you are thinking about is going to drop you too low through the night, especially if you have had more than one alcoholic drink.
You are likely to have to give a correction dose along with your morning basal but monitoring your sugars is easier during the day when you are awake. Put it down to experience.
You can even write essential tasks or times on ball point pen on the back your hand. Usual handwashing takes about a day to clear it and if you want to wipe off your “to do” list little alcohol swabs come in handy.
You miss your morning basal. You took your basal insulin with you to a friend’s last night and remember in the morning that it is still in your bag which is in her car. She lives across the city, and the pharmacy does not open till 2pm, and you have no spare because you have not been paying attention to the advice you were given in the organising your supplies section (!).
Give yourself a series of correction doses during the day before your meals. You can use novorapid or humalog and these last about three and a half hours. If you have regular insulin this is even better as it lasts 5 hours. Start your basal again with the night injection.
Missing a day dose is usually easier to deal with because you are awake and you can correct any lows easier. Keeping a notebook or having one of the new pens that records your doses can be helpful. Because looking after your diabetes becomes so automatic you can easily get muddled up about whether you took the dose or not. When you are one of two parents or carers and not the diabetic person it is even more important to record what you do. Without this it can be even easier to make mistakes and give an infirm person or a child two doses of insulin or none!
It is human nature to muddle up from time to time. When you do, the most important things are forgive yourself, calm yourself down, and THINK!
Have you got it?
- In a restaurant three of these places are suitable for insulin injections…
a In the washroom.
b In the abdomen at the table.
c Through your clothing.
d Hiding underneath the table.
2.The Glycaemic Load of a food is…
a Its relative effect on your blood sugar.
b A measure of the percentage of carbohydrate it contains.
c A measure of how much insulin is needed to cover the food.
d A measure of how much the food fills you up.
- The Glycaemic Index…
a Has been extensively tested on diabetics.
b Tells how fast your blood sugar will go up with certain foods.
c Should be the basis for a sensible eating plan in every diabetic.
d Needs to be verified by personal experimentation.
- For insulin users you need to monitor your blood sugars in three of these situations...
a Before and after exercising.
b Before you drive and at hourly intervals when driving.
c Before you go into a public place like a cinema.
d Whenever you feel hungry or suspect you could be running higher or lower than normal.
- Three helpful tips for type one youngsters include…
a Have your bracelet, insulin, tester and food when you are on an outing.
b Carry a charge mobile phone.
c Carry money in case you need to buy food.
d Avoid telling your mates you are diabetic so you will fit in better.
- Three of these statements about insulin are correct. Which one is not correct…
a Lantus must never be mixed with other insulins because it depends on its acidic pH for it’s action.
b Cloudy insulins must be mixed thoroughly before injecting.
c Levemir has twice the potency of Lantus insulin.
d Humalog and Novolog have 150% of the potency or regular insulins.
- Three statements about basal insulin are true…
a It is used to cover meals.
b It should be matched to the liver’s normal secretion of sugar.
c It is needed to keep the blood sugar level steady between meals and during sleep.
d Can be most accurately obtained by using an insulin pump.
- At college don’t bother with one of these…
a Testing your sugar before exams.
b Eating food when you drink alcohol.
c Getting your flu shot every year.
d Avoiding going to parties.
- When you go on holidays it is silly to do one of these…
a Go to a theme park and forget a rendezvous point.
b Carry extra food and drinks on planes.
c Test draught drinks with diastix.
d Work out how you will deal with time zones before you go.
- Advantages of being a type one diabetic can include three of these…
a Getting a fridge in your room at college.
b Getting a room nearer the kitchen at college.
c Sleeping in on the mornings on days off.
d Getting a pass to skip long queues at some theme parks.
Have you got it?
- D is taking secrecy too far! Although many people still prefer the privacy of a washroom it is entirely acceptable to inject at the table. With the rise in the number of people with diabetes you can expect to see this happening more frequently.
- A is correct. The GL is and indication on what effect you can expect that food to have on your blood sugars. The carbohydrate index is the percentage of carb a food contains. This can be a helpful technique in carb counting.
- D is correct. Its all about self experimentation. The GI was tested on healthy non diabetics. It is a rough indication of how fast sugars are released and diabetics are wise to steer clear of very fast acting carbs. The precise rate of release however depends on so many factors such as quantity, chunk size, temperature and what sorts of foods are eaten along with them that personal experimentation is the only way to find out how a food that you eat regularly will affect you.
- ABD are musts. Use your own discretion in other situations.
- ABC are sensible. Not telling your mates isn’t!
- ABD are all correct. Levemir is weaker in effect than Lantus unit for unit. Levemir has around 75 percent of the potency of Lantus. As these are both basal insulins it is unlikely that you need to remember this unless you swap one for the other for a particular reason.
- BCD are correct. Pumps can be adjusted for the dawn phenomenon and exercise patterns with much more versatility than basal injections. This is one of their major advantages. There are trade offs in other respects of course. Bolus injections are used to cover meals.
- D. Parties can be quite a challenge for young diabetics away from home, but you can still go and enjoy yourself. Always drink moderately and avoid drugs. Let your mates know about how to detect and treat hypos. If you have passed out they must get you to hospital. Phoning 999 is the usual way in the UK.
- A is correct. It is also sensible to write down exactly where you have parked the car! Diastix were originally used to detect sugar in urine but they can be very handy for testing whether your cola is the diet version or not.
10. ABD are correct. And you didn’t think there were ANY advantages to being insulin dependent did you? Unfortunately having a lie in is not on. You must get up at the usual time to test and give yourself your basal insulin at the very least. If you like, you can then go back to bed.