Sickle-cell anaemia is characterized by alternating periods of good health and painful crises. These crises can take various forms, each with unique causes and management strategies.
| 📌 Type of Crisis | 💡 Key Points |
|---|---|
| Thrombotic Crisis | Painful vaso-occlusive events due to sickling. |
| Acute Chest Syndrome | Vaso-occlusion in pulmonary microvasculature. |
| Aplastic Crisis | Caused by parvovirus leading to bone marrow suppression. |
| Sequestration Crisis | Pooling of blood in organs worsening anaemia. |
🔍 Types of Sickle-Cell Crises
Sickle-cell crises can be classified into several types, each with distinct features:
💉 Thrombotic Crises
- Also known as painful crises or vaso-occlusive crises.
- Commonly precipitated by:
- Infection
- Dehydration
- Deoxygenation (e.g., high altitude)
- Diagnosis is primarily clinical; there's no definitive test.
- Infarcts can occur in various organs, including:
- Bones (e.g., avascular necrosis of the hip)
- Lungs
- Spleen
- Brain
🌬️ Acute Chest Syndrome
- Caused by vaso-occlusion in the pulmonary microvasculature, leading to lung parenchyma infarction.
- Symptoms include:
- Dyspnoea
- Chest pain
- Pulmonary infiltrates on chest x-ray
- Low pO2
- Management strategies include:
- Pain relief
- Respiratory support (e.g., oxygen therapy)
- Antibiotics to address possible infections
- Blood transfusions to improve oxygenation
- Incentive spirometry to enhance ventilation
- It is the most common cause of death after childhood.
🩸 Aplastic and Sequestration Crises
- Aplastic Crises:
- Triggered by parvovirus infection.
- Characterized by a sudden fall in haemoglobin and reduced reticulocyte count due to bone marrow suppression.
- Sequestration Crises:
- Involves sickling in organs such as the spleen or lungs, causing blood pooling and worsening anaemia.
- Typically associated with an increased reticulocyte count.
📝 Key Takeaways
- Sickle-cell crises can present in multiple forms, each requiring specific management strategies.
- Timely diagnosis and treatment are crucial to manage complications and improve patient outcomes.