Diabetes/DKA Flashcards
What viruses can trigger T1DM?
Coxsackie B virus and enterovirus
Ideal body glucose
4.4-6.1
What produces glucagon?
Alpha cells in islets of langhan
How do children with diabetes often present?
DKA
What is DKA?
When pancreas can;t produce enough insulin to maintain basic blood glucose regulation
Symptoms of diabetes
Polyuria
Polydipsia
Weigh tloss
Apart from DKA how else can children with T1DM present?
Seondary enuresis
Recurrent infections
How long are symptoms present before DKA presentation?
1-6 weeks before
Bloods need to do after new diagnosis of T1DM?
FBC, renal profile (U+E) and a formal laboratory glucose
Blood cultures
HbA1c
Thyroid function tests and TPO to test for ass AI thyroid disease
antiTTG antibodies - coeliac
INsuline antibodies, anti-GAF antibodies and islet cell antibodies
What to test for ass with direct destruction of the pancreas>
INsuline antibodies, anti-GAF antibodies and islet cell antibodies
Management of T1DM in children?
SC insulin regimes
Monitoring dietary carbohydrate intake
Monitoring blood sugar levels on waking, at meals and before bed
Monitorung for and managing complications, long and short term
What can continous insulin injections into same spot cause?
Lipodystrophy
What is lipodystrophy?
SC fat hardens and prevents normal absorption of insulin if further injections into this area
Why should patients inject in different areas each time for treatment>
Risk of lipodystrophty
How often is the cannula of an insulin pump replaced?
2-3 days
How does a child qualify for an insulin pump on the NHS?
> 12 years
Have difficulty controlling HbA1c
Advantages of insulin pump
Better blood sugar contil
More flexibility with eating
Less frequent injections
Disadvantages of insulin pump?
Difficulties difficult learning to use
Attached at all times
Blockage in infusion set
Small risk of infection
Two types of insulin pump
Tethered pump
Patched pump
What are tethered insulin pumps?
Replaceable infusion set and insulin attached to belt or waist with a tube conneciting pump to infusion site. Contols on pump iteslf
What are patch pumps?
Sit directly on skin without visible tubes
When run out of insulin entire pathc pump disposed of and new pump attached
Short term complications related to immediate insulin and blood glucose management
Hypoglycaemia
Hyperglycaemia + DKA
Typical symptoms of hypoglycaemia
Hunger
Tremor
Sweating
Irritability
Dizziness
Pallor
Severe:
Reduced consciousness, coma and death
How is hypoglycaemia treated?
Combination rapid acting glucose eg lucosade and slower acting carbohydrates eg biscuits or toast to maintain
Treatment for severe hypo when losing consciousness
IV dextrose and IM glucagon
What solution can be given IV in hypoglycaemia?
10% dextrose solution
eg 2mg/kg bolus then 5mg/kg/hr infusion
Causes of hypoglycaemia except T1DM
Hypothyroidism
Glycogen storage disorders
Growth hormone deficiency
Liver cirrhosis
Alcohol and fatty acid oxidation defects - MCADD
What is a common complication of diabetes treatment?
Nocturnal hypoglycaemia
How is nocturnal hypoglycaemia dianosed and treated>
Morning blood glucose is raised - continous glucose monitoring overnight
Treated by altering the bolus insulin regimes and snacks at bedtime
How much does one unit of novorapud reduce sugar levels by?
4 mmol/l
3 groups of long term complications of hyperglycaemia
Macrovascular
Microvascular
Infection related complications
Macrovascular complications of hyperglycaemia
- Coronary artery disease
- Peripheral ischaemia causes poor healing, ulcers and “diabetic foot”
- Stroke
- Hypertension
Microvascular complications
Peripheral neuropathy
Retinopathy
Kidney disease, especially glomerulosclerosis
Microvascular complications
Peripheral neuropathy
Retinopathy
Kidney disease, especially glomerulosclerosis
Infection related complications
UTI
Pneumonia
Skin and soft tissue infections, particuarly in feet
Fungal infections, particuarly oral and vaginal candiadiasis
Infection related complications
UTI
Pneumonia
Skin and soft tissue infections, particuarly in feet
Fungal infections, particuarly oral and vaginal candiadiasis
What is HbA1c measuring?
Glycated haemoglobin
Glucose attached to haemoglobin inside cells
How long does the HbA1c reflect glucose levels of?
3 months
How often do you monitor HbA1c in diabetes?
3-6 months
What bottle is HbA1c measured with?
Red top EDTA bottle
How does flash glucose monitoring work?
Sensor on skin measures glucose level intersistitial fluid in subcutaneous tissue
5 minute lag behind body glucose
How does flash glucose monitoring work?
Sensor on skin measures glucose level intersistitial fluid in subcutaneous tissue
5 minute lag behind body glucose
Why is capillary blood glucose necessary aswell as flash glucose monitoring to monitor glucose?
CBG - finger prick testing - 5 minute lag between actually blood glucose and amount on flash glucose monitoring
Why is capillary blood glucose necessary aswell as flash glucose monitoring to monitor glucose?
CBG - finger prick testing - 5 minute lag between actually blood glucose and amount on flash glucose monitoring
What is ketogenesis and when does it occur?
Supply of glucose/glycogens stores exhausted
During prolonged fast or low carb diets
Liver converts FA to ketones
What is ketogenesis and when does it occur?
Supply of glucose/glycogens stores exhausted
During prolonged fast or low carb diets
Liver converts FA to ketones
What causes DKA?
Inadequate insulin -> Hyperglycaemic ketosis -> metabolic acidosis that can’t be buffered sufficiently after a while (bicarb from kidneys used up)
Main problems in DKA
Ketoacidosis
Dehydration
Potassium imbalance
Why does DKA cause dehydration?
Hyperglycaemia overwhelms kidneys -> filtered into urine, drawing water out with it -> polyuria and dypsia
What is important to correct when treating DKA?
Hypokalemia that will be triggered by insulin treatment
Why does insulin treatment in DKA cause hypokalemia?
Serum potassium - high or normal, kidneys balance excreted with blood
Total body potassium low as not absorbed into cells
Therefore when treated with insulin not enough potassium in blood to be absorbed - hypokalemia
What is the priority in DKA treatment?
Fluid resuscitiation - correct dehydration, electrolyte disturbance and acidosis
Only then treat with insulin
What are children with DKA at high risk of developing as a complication?
Cerebral oedema
What are children with DKA at high risk of developing as a complication?
Cerebral oedema
What causes cerebral oedema in DKA?
Dehydration and blood sugar conc - move from intracellular space in brain to EC space
Brain cells shrink -> rapid correction with fluids and insulin
Rapid shift in water from EC space to IC space in brain cells -> oedematous -> cell death
What shoudl be monitored hourly after DKA treatment in children?
Neurological observations = GCS
Cerebral oedema
Red flags after treatemtn for DKA
Headaches
Altered behaviour
Bradycardia
Changes of consicousness
Managmenet for cerebral oedema
Slow IV luids
IV mannitol
IV hypertonic saline
Presentation of DKA?
- Polyuria
- Polydipsia
- Nausea and vomiting
- Weight loss
- Acetone smell to their breath
- Dehydration and subsequent hypotension
- Altered consciousness
- Symptoms of an underlying trigger (i.e. sepsis)
Criteria for diagnosis of DKA
Hyperglycaemia >11 mol/l
Ketosis >3mmol/l
Acidosis pH <7.3