Quick Overview
Type 1 diabetes (T1D) in children results from autoimmune pancreatic β-cell destruction causing absolute insulin deficiency. Diagnosis requires HbA1c ≥48 mmol/mol (6.5%) or fasting glucose ≥7.0 mmol/L or random glucose ≥11.1 mmol/L with symptoms. NICE NG18 emphasizes structured management to prevent acute complications (DKA, hypoglycaemia) and long-term microvascular damage through tight glycaemic control (target HbA1c <48 mmol/mol).
Core Facts & Concepts
📊 Diagnostic Thresholds (NICE NG18)
- HbA1c ≥48 mmol/mol (6.5%) OR
- Fasting plasma glucose ≥7.0 mmol/L OR
- Random glucose ≥11.1 mmol/L with symptoms (polyuria, polydipsia, weight loss)
- C-peptide low/undetectable; diabetes autoantibodies positive (GAD, IA-2, ZnT8)
🎯 Treatment Targets
- HbA1c: <48 mmol/mol (6.5%) without disabling hypoglycaemia
- Pre-meal glucose: 4-7 mmol/L
- Post-meal glucose: 5-9 mmol/L
- Bedtime glucose: 4-7 mmol/L

💊 Insulin Regimens
- Basal-bolus: Long-acting (detemir/glargine/degludec) + rapid-acting (aspart/lispro) with meals
- Insulin pump (CSII): Consider if HbA1c >69 mmol/mol despite compliance OR disabling hypoglycaemia
- Total daily dose: 0.5-1.0 units/kg/day (higher in puberty ~1.5 units/kg)
Monitoring Schedule
- Blood glucose: ≥5 tests/day (pre-meals, bedtime, before driving/exercise)
- HbA1c: Every 3 months
- Annual screening (from 12 years or 5-year duration): retinopathy, nephropathy (ACR), neuropathy, thyroid, coeliac
Problem-Solving Approach
DKA Management Protocol (pH <7.3 OR bicarbonate <15 mmol/L)
-
Fluid resuscitation:
- 10 mL/kg 0.9% saline bolus over 1 hour (repeat if shocked)
- Maintenance + deficit over 48 hours (avoid cerebral oedema)
- Add 0.9% saline + 40 mmol/L KCl once urine output established
-
Insulin: 0.05-0.1 units/kg/hour IV (start 1-2 hours after fluids)
-
Monitoring: Hourly glucose, 2-hourly venous gases, neuro obs (cerebral oedema risk)
-
Switch to SC insulin when: pH >7.3, bicarbonate >15, tolerating oral
🚩 DKA Red Flags
- Headache, bradycardia, rising BP → cerebral oedema (give mannitol 0.5 g/kg)
- Fluid resuscitation >10 mL/kg/hour increases cerebral oedema risk
Hypoglycaemia Management (<4 mmol/L)
- Conscious: 15g fast-acting carbs (150mL juice, 4-5 glucose tablets)
- Unconscious/unable to swallow: IM glucagon 0.5-1mg OR IV 10% glucose 2mL/kg
- Recheck in 15 minutes; give long-acting carb after recovery
Sick Day Rules
- Never stop insulin (increase by 10-20% if hyperglycaemic)
- Check glucose 2-4 hourly
- Check ketones if glucose >14 mmol/L
- Maintain hydration; seek help if persistent vomiting/ketones
Analysis Framework
| Feature | Basal-Bolus | Insulin Pump (CSII) |
|---|---|---|
| Indication | First-line for all | HbA1c >69 despite adherence OR disabling hypoglycaemia |
| Flexibility | Moderate | High (variable basal rates) |
| Injections/day | 4-5 | Continuous SC infusion |
| Cost | Lower | Higher |
| Training needs | Standard | Intensive |
Differential: Hyperglycaemia Causes
- Insufficient insulin dose
- Missed injections/pump failure
- Intercurrent illness (infection)
- Steroid therapy
- Growth spurt (increased insulin resistance)
Visual Aid
| Complication | Screening | Frequency |
|---|---|---|
| Retinopathy | Digital retinal photography | Annual from age 12 or 5yr duration |
| Nephropathy | Urine ACR | Annual from age 12 or 5yr duration |
| Neuropathy | Monofilament/vibration | Annual from age 12 |
| Thyroid disease | TSH | Annual |
| Coeliac disease | tTG antibodies | At diagnosis, then annual |
Key Points Summary
✓ Diagnosis: HbA1c ≥48 mmol/mol or fasting glucose ≥7.0 mmol/L; target HbA1c <48 mmol/mol
✓ DKA protocol: 10 mL/kg 0.9% saline bolus, then deficit over 48 hours; insulin 0.05-0.1 units/kg/hour (start after fluids)
✓ Insulin regimens: Basal-bolus first-line; pump if HbA1c >69 mmol/mol despite adherence or disabling hypoglycaemia
✓ Hypoglycaemia (<4 mmol/L): 15g fast carbs if conscious; IM glucagon 0.5-1mg if unconscious
✓ Sick day rules: Never stop insulin (increase 10-20%); check glucose 2-4 hourly; check ketones if glucose >14 mmol/L
✓ Monitoring: Blood glucose ≥5 times/day; HbA1c every 3 months; annual complication screening from age 12
✓ Cerebral oedema (DKA complication): Headache + bradycardia + rising BP → give mannitol 0.5 g/kg immediately
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