Post-Operative Hypoglycaemia Prevention and Management
Your Role — Nurse
Surgical Ward
Your 68-year-old patient with type 2 diabetes is day two post-operative following a hemicolectomy for colorectal cancer. The patient has been managing diabetes with oral medication and diet. Since surgery, the patient has had two episodes of hypoglycaemia (capillary blood glucose of 3.2 mmol/L and 3.8 mmol/L). The medical team has adjusted the diabetes medications and you need to educate the patient on recognising and managing hypoglycaemic episodes before discharge.
- •Confirm whether the patient has experienced symptoms of hypoglycaemia (sweating, trembling, confusion, palpitations, hunger). Find out if the patient knows what a 'hypo' is and how to recognise it.
- •Explain why hypoglycaemia can happen after surgery (reduced oral intake, altered metabolism, medication adjustment). Reassure that the medication has been reviewed to reduce the risk.
- •Teach the '15-15 rule': check blood glucose, if <4 mmol/L, take 15g fast-acting carbohydrate (4-5 glucose tablets, half a glass of fruit juice or regular soft drink), wait 15 minutes, recheck, repeat if still low. Then follow with a longer-acting carbohydrate (biscuits, sandwich, next meal).
- •Explain when to escalate: if blood glucose does not rise after two rounds of treatment, if the patient becomes unconscious or confused, if they are unable to swallow safely (call 999, do not give anything by mouth, place in recovery position).
- •Discuss sick-day rules for diabetes management at home (what to do if unable to eat, when to check blood glucose more frequently, when to contact GP or diabetes nurse). Provide a written hypoglycaemia management plan. Establish patient's confidence to recognise and treat a hypo.
The Interlocutor
Played by the actor / assessor
You are 68 years old and had surgery for bowel cancer two days ago. You have type 2 diabetes which you've managed with tablets for years. You've had a couple of 'hypos' since your operation and it scared you. You're due to go home in a few days and you're not sure how to manage your diabetes at home, especially if you feel unwell.
- •When asked, say you felt shaky, sweaty, and confused earlier today. A nurse tested your blood and it was low. You didn't know what was happening — it was frightening.
- •Say you usually take metformin and a tablet called gliclazide. You're not sure if you should keep taking them now that you're eating less than usual.
- •When asked, say you don't really know what a 'hypo' is or how to treat it. No one has explained it to you properly before.
- •Say you live alone and you're worried about what might happen if your blood sugar drops when there's no one around.
- •Say you feel much better now that you understand the 15-15 rule. You'll keep some glucose tablets and juice at home. You'll also speak to your GP about the sick-day rules.
Sample Role-play
Good morning Mr Tan. I am Sarah one of the ward nurses here. How are you feeling this morning after your operation?
Sore but managing. The nurses have all been very good to me.
I am glad you are comfortable. I wanted to talk to you about those low blood sugar episodes you had yesterday. You had a couple of what we call hypos. Do you remember what that experience felt like for you?
Yes it was horrible. I felt shaky all over started sweating and my mind went blank. I could not think straight at all. I thought something was seriously wrong with me.
I can understand why you would feel that way. What you experienced is actually called a hypo which is short for hypoglycaemia. It means your blood sugar dropped too low. It is quite common after major surgery for people with diabetes because your body's metabolism changes in response to the surgery and you are eating less than usual.
So it is not a complication from the bowel operation itself?
No it is not a sign that anything has gone wrong with the surgery. The key thing is knowing how to recognise the early warning signs and treat a hypo quickly. The warning signs to watch for are sweating trembling feeling hungry a pounding heart and that feeling of confusion you had. The moment you notice any of these you need to act.
What exactly should I do when it happens?
We use something called the fifteen-fifteen rule which is easy to remember. First you take fifteen grams of fast-acting sugar — that is four glucose tablets half a glass of fruit juice or a small glass of regular fizzy drink but not diet. Then you wait fifteen minutes and check your blood sugar again. If it is still low you repeat the treatment. Once it is back to normal you have a longer-acting snack like two biscuits or a sandwich to keep it stable.
What if I pass out or cannot treat myself?
If you become unconscious or too confused to swallow whoever is with you must call 999 immediately and they must not put anything in your mouth because you could choke. Since you live alone the most important thing is to treat the hypo early at the first warning sign. I recommend keeping glucose tablets next to your bed in your living room and in your coat pocket so they are always within easy reach wherever you are.
I will get some tablets for around the house.
I will also give you a written hypo action plan to keep in your wallet and I recommend you wear a medical ID bracelet that says you have diabetes. Your diabetes medication has been adjusted by the doctors and your GP will review this after you go home. It is also important to know the sick-day rules for when you feel unwell and cannot eat normally.
What are the sick-day rules?
If you have an infection fever or vomiting and cannot eat normally you should check your blood sugar every two to four hours. Continue taking your medication unless your doctor says otherwise. Drink plenty of sugar-free fluids to stay hydrated. If your blood sugar stays high or you cannot keep fluids down you should contact your GP urgently. I will give you written guidelines for this as well.
That all makes sense. Thank you Sarah. I feel much more confident now.
You are very welcome. I will bring your written hypo action plan and the sick-day guidelines to you shortly. You are recovering well from your surgery and we are here to support you.
Useful Phrases
Clinical Background
Post-operative hypoglycaemia in patients with diabetes is a common complication, especially following major abdominal surgery. Contributing factors: reduced oral intake, altered insulin sensitivity, changes in medication timing, and the metabolic stress response to surgery. Patient education should include: recognition of hypo symptoms, the 15-15 treatment rule, when to escalate, and sick-day management. A written hypoglycaemia action plan should be provided before discharge.
Common Mistakes to Avoid
- ✕Assuming the patient knows what hypoglycaemia is — many patients have never been formally educated.
- ✕Not providing a written plan — patients forget verbal instructions when stressed or hypoglycaemic.
- ✕Failing to address the patient's fear — a hypo is a frightening experience and anxiety can affect recovery.