What is anaemia anime type definition
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I think you may have meant "anaemia and its types" (definition + classification), not "anime." Here is a comprehensive answer from the medical textbooks:
Anaemia — Definition and Types
Definition
Anaemia is a significant reduction in the volume of erythrocytes (red blood cells) in the body, resulting in a decreased oxygen-carrying capacity and delivery to tissues and organs.
Because direct measurement of red cell mass is cumbersome, anaemia is defined clinically using surrogate measures:
- Haemoglobin (Hb) concentration — the preferred measure (directly measured)
- Haematocrit (Hct / packed cell volume)
WHO Diagnostic Thresholds:
| Group | Hb threshold |
|---|---|
| Adult men | < 13.0 g/dL |
| Adult women | < 12.0 g/dL |
| Pregnant women | < 11.0 g/dL |
These thresholds are somewhat arbitrary and can vary with altitude, race, and age. — Brenner and Rector's The Kidney, p. 2461 | Goldman-Cecil Medicine, p. 1666
Classification of Anaemia
Anaemia is classified by two main approaches:
1. Morphological Classification (by red cell size — MCV)
| Type | MCV | Examples |
|---|---|---|
| Microcytic (small cells) | < 80 fL | Iron deficiency anaemia, Thalassaemia, Anaemia of chronic disease (some) |
| Normocytic (normal size) | 80–100 fL | Acute blood loss, Haemolytic anaemia, Aplastic anaemia, Renal disease |
| Macrocytic (large cells) | > 100 fL | Vitamin B12 deficiency, Folate deficiency (megaloblastic), Liver disease, Hypothyroidism |
2. Pathophysiological Classification (by mechanism)
| Mechanism | Description | Examples |
|---|---|---|
| Decreased production | Bone marrow fails to produce enough RBCs | Iron/B12/folate deficiency, Aplastic anaemia, Anaemia of chronic kidney disease (↓ EPO), Bone marrow infiltration |
| Increased destruction (Haemolysis) | RBCs destroyed faster than replaced | Sickle cell disease, Thalassaemia, G6PD deficiency, Autoimmune haemolytic anaemia |
| Blood loss | Acute or chronic haemorrhage | GI bleeding, Trauma, Menorrhagia |
Key Pathophysiology
The red blood cell (RBC) is a biconcave, anucleate disc (~8 µm diameter) whose major component is haemoglobin — a molecule optimally designed to deliver O₂ from lungs to peripheral tissues and return CO₂. Each normal RBC contains 30–40 pg of haemoglobin and survives ~120 days in circulation.
When Hb falls, the body compensates by:
- Increasing heart rate and cardiac output
- Shifting the oxygen-haemoglobin dissociation curve rightward (↑ 2,3-DPG)
- Redistributing blood flow to vital organs
— Goldman-Cecil Medicine, p. 1666
In short: Anaemia = reduced RBC mass → reduced O₂ delivery. Classified by size (micro/normo/macrocytic) or by cause (decreased production, increased destruction, blood loss).
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