P THALSSMIA X IRON OVERLOAD

 A

Management of iron overload in thalassaemia within the UK (including NHS practice) follows internationally accepted guidelines (e.g. Thalassaemia International Federation, UK haemoglobinopathy centres). Here’s a clear, exam-style summary focused on NHS-relevant practice:

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🩸 1. Why iron overload occurs

• Regular blood transfusions (main cause in transfusion-dependent thalassaemia)

• Increased intestinal iron absorption (especially non-transfusion dependent)

• Humans cannot excrete excess iron effectively (NCBI)

➡️ Leads to iron deposition in:

• Heart → cardiomyopathy

• Liver → cirrhosis, cancer

• Endocrine organs → diabetes, hypogonadism

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🎯 2. Goals of management

• Prevent toxic free iron (Fe²⁺)

• Maintain safe total body iron levels

• Avoid organ damage

• Achieve negative iron balance (excrete more than accumulated) (NCBI)

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🧪 3. Monitoring (standard NHS practice)

A. Blood tests

• Serum ferritin (every 3 months typically)

  • Correlates with iron stores

  • Can be affected by inflammation/liver disease (NCBI)

• Transferrin saturation

  • 50–70% suggests toxic iron species (NCBI)

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B. Imaging

• MRI T2* (key NHS tool)

  • Liver iron concentration (LIC)

  • Cardiac iron (predicts heart failure risk) (NCBI)

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💊 4. Iron chelation therapy (MAINSTAY)

👉 Started early:

• Usually after ~10–20 transfusions or ferritin >1000 µg/L (typical practice)

A. First-line options used in the NHS

1. Desferrioxamine (DFO)

• Subcutaneous infusion (8–12 hrs, 5–7 nights/week)

• Dose:

  • ~20–40 mg/kg (children)

  • up to 50–60 mg/kg (adults) (NCBI)

✔️ Very effective
❌ Poor compliance (pump required)

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2. Deferasirox (oral, once daily)

• Common NHS first-line (better adherence)

• Excreted via faeces

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3. Deferiprone (oral, TDS)

• Particularly effective for cardiac iron removal

• Often used:

  • If DFO inadequate

  • Or in combination therapy

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B. Combination therapy

Used in severe overload (e.g. cardiac iron):

• Deferiprone + desferrioxamine

➡️ Improves cardiac outcomes

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C. Key principle

👉 Continuous chelation is crucial

• Iron toxicity returns quickly when chelator stops

• Ideally 24-hour coverage in severe cases (NCBI)

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⚖️ 5. Dose adjustment (NHS specialist care)

Chelation is individualised based on:

• Ferritin trends

• MRI findings

• Transfusion rate

Avoid:

• ❌ Under-chelation → organ damage

• ❌ Over-chelation → drug toxicity (NCBI)

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🚨 6. Management of complications

Cardiac iron overload

• Intensify chelation urgently

• Combination therapy often required

Endocrine/liver disease

• Manage complications (e.g. insulin, hormone replacement)

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🥗 7. Role of diet (important exam point)

• Dietary restriction NOT sufficient

• Iron overload mainly from transfusions

• Chelation is essential (not diet alone)

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🧠 8. Key NHS-style summary (for exams)

• Monitor: Ferritin + MRI T2*

• Start chelation early

• Use:

  • Deferasirox (oral) – common first-line

  • Desferrioxamine – effective but inconvenient

  • Deferiprone – cardiac iron

• Aim: prevent organ damage + maintain safe iron levels

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📌 High-yield viva points

• Iron overload = inevitable with transfusions

• Ferritin alone is not fully reliable

• Cardiac MRI (T2*) = prognostic

• Chelation must be lifelong and continuous

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If you want, I can convert this into:

• OSCE answer

• SBA revision table

• NICE/NHS guideline comparison

• Flashcards for quick memorisation