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Type 1 diabetes in children

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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

Figure 1: Blood glucose meter showing reading of 2.8 mmol/L indicating hypoglycaemia

💊 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)

  1. 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
  2. Insulin: 0.05-0.1 units/kg/hour IV (start 1-2 hours after fluids)

  3. Monitoring: Hourly glucose, 2-hourly venous gases, neuro obs (cerebral oedema risk)

  4. 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

FeatureBasal-BolusInsulin Pump (CSII)
IndicationFirst-line for allHbA1c >69 despite adherence OR disabling hypoglycaemia
FlexibilityModerateHigh (variable basal rates)
Injections/day4-5Continuous SC infusion
CostLowerHigher
Training needsStandardIntensive

Differential: Hyperglycaemia Causes

  • Insufficient insulin dose
  • Missed injections/pump failure
  • Intercurrent illness (infection)
  • Steroid therapy
  • Growth spurt (increased insulin resistance)

Visual Aid

ComplicationScreeningFrequency
RetinopathyDigital retinal photographyAnnual from age 12 or 5yr duration
NephropathyUrine ACRAnnual from age 12 or 5yr duration
NeuropathyMonofilament/vibrationAnnual from age 12
Thyroid diseaseTSHAnnual
Coeliac diseasetTG antibodiesAt 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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