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  • in diabetic patients, hypoglycaemia is usually defined as blood glucose concentration less than 3.5 mmol/L

clinical features of hypoglycaemia

  • Recurrent hypoglycaemia or long-standing diabetes can cause a dulling or loss of warning symptoms. This is referred to as “hypoglycaemia unawareness”. In this case, the first sign of hypoglycaemia may be unconsciousness.

early symptoms

  • sweating
  • irritability
  • palpitations
  • trembling
  • tingling of fingers and lips
  • headache

later symptoms

  • disturbance of concentration
  • slurred speech
  • aggressive behaviour
  • confusion
  • seizures
  • loss of consciousness

Mx of hypoglycaemia in diabetic patients

initial Mx if conscious and able to swallow

  • give rapidly absorbed simple carbohydrate ASAP:
    • 1 tube glucose gel (15g), or,
    • a small glass (150mL) of Lucozade, strong cordial, fruit juice (apple or orange juice) or soft drink (NOT sugar free)
    • if symptoms not settling, repeat in 5-10min.
  • follow with a long acting carbohydrate to maintain blood glucose level:
    • half a sandwich, or,
    • a piece of fruit, or,
    • a glass of milk, or,
    • 4-6 dry biscuits, or,
    • next meal if due

initial Mx if unable to swallow

  • place patient on their side
  • ensure clear airway
  • for adults, give 25-50mls 50% dextrose iv (can dilute to 25% or 12.5% to reduce venous irritation)
  • if iv access not available or difficult, give 1mg glucagon im (for adults)
  • ongoing 5% dextrose 100mL/hr infusion may be needed
  • give slow acting carbohydrate as above when able to swallow

recovery from hypoglycaemia

  • clinical symptoms generally resolve within 5 minutes of iv or im Rx as above, but complete recovery of symptoms may take hours, particularly if hypoglycaemia was prolonged or severe
  • watch for and Rx any recurrence of hypoglycaemia after initial Rx:
    • recheck BGL within 15-20min then if BGL > 3.9 re-commence qid checks
    • if patient had been unconscious, check dextrostix hourly for 4 hours
    • BGL may remain unstable for 24 hours
  • ensure patient education
Do NOT with-hold insulin in patients with type I diabetes as this may result in diabetic ketoacidosis (DKA)

identify and manage cause of hypoglycaemia

  • missed or delayed meal
  • insufficient carbohydrate
  • increased physical activity
  • excessive medication
  • renal impairment
  • hypothyroidism
  • adrenal insufficiency
hypoglycaemia.txt · Last modified: 2017/08/24 14:27 (external edit)