Anemia and Blood Components

Blood Components and Their Functions

  • Discussion of blood components:
    • Red Blood Cells (RBCs)
    • Fancy name: Erythrocytes
    • Function: Carry oxygen and carbon dioxide.
    • Low erythrocyte count leads to anemia, characterized by low oxygen transport capacity.
    • Platelets
    • Function: Facilitate blood clotting.
    • Low platelet count increases the risk of spontaneous bleeding.
    • Leukocytes
    • Fancy term for white blood cells (WBCs).
    • Types of leukocytes and their functions:
      • Neutrophils
      • First line of defense against infections.
      • Most abundant type of leukocyte.
      • When low, patients are at high risk of infection (neutropenic precautions required).
      • Eosinophils
      • Fight diseases, particularly parasitic infections.
      • Mnemonic: Ew for eosinophil (related to parasites).
      • Basophils
      • Involved in immune responses, particularly with allergies and asthma.
      • Mnemonic: B for breathing (asthma, allergies).
      • Monocytes
      • Fight bacteria, viruses, and other infections.
    • Clinical significance of low leukocyte count: Increased infection risk.

Anemia Overview

  • Definition of anemia: A condition characterized by low oxygen-carrying capacity of blood.
  • Causes:
    • Insufficient red blood cell production.
    • Presence of dysfunctional red blood cells.
  • Symptoms of anemia:
    • Tissue hypoxia (e.g., paleness of lips and gums).
    • Chest pain due to insufficient oxygen delivery to the heart.
    • Faintness due to lack of oxygen to the brain.

Clinical Manifestations of Anemia

  • General symptoms:
    • Pallor: Particularly noticeable in mucus membranes and eyelids.
    • Increased heart rate: Compensatory mechanism due to lack of oxygen.
    • Tachycardia: Resulting from increased metabolic demand.
    • Dyspnea: Differentiating between general dyspnea and exertional dyspnea.
    • Exertional dyspnea is difficulty breathing during increased activity.
  • Other symptoms include fatigue, weakness, and low stamina.

Types of Anemia

  • Classification based on the status of red blood cell production:
    • Decreased Red Blood Cell Production:
    • Aplastic Anemia
      • Definition: A stem cell disorder causing reduced hematopoietic tissues in bone marrow (pancytopenia).
      • Causes: Toxic drugs (like chemotherapy), radiation, or immunologic damage to stem cells.
      • Diagnostic tool: Bone marrow biopsy.
    • Pernicious Anemia
      • Due to vitamin B12 deficiency leading to megaloblastic anemia.
      • Associated with lack of intrinsic factor which is necessary for B12 absorption.
      • Common in older individuals and those undergoing gastrectomy.
    • Iron Deficiency Anemia
      • Most common nutritional deficiency worldwide.
      • Due to insufficient iron intake or absorption, increased demand during pregnancy, and chronic blood loss.
      • Clinical manifestations: Pica (eating non-food items), spoon-shaped nails, and angular cheilitis (cracks at mouth corners).
    • Dysfunctional Red Blood Cells:
    • Hemolytic Anemia
      • Definition: Anemia caused by the destruction of red blood cells.
      • Symptons: Jaundice due to hemoglobin released from lysed cells, splenomegaly from increased debris clearance.
      • Thalassemia: Genetic disorder resulting in decreased hemoglobin production.
      • Sickle Cell Anemia: Genetically determined hemoglobin instability leads to sickled red blood cells, causing vascular occlusion and pain crises.
    • Polycythemia Vera: Anemia characterized by a proliferation of red blood cells, white blood cells, and platelets leading to increased blood viscosity and various complications.

Diagnostic Studies for Anemia

  • General diagnostic approach:
    • Complete Blood Count (CBC): Measures red blood cell, white blood cell, and platelet counts.
    • Bone Marrow Biopsy: Helps identify various anemias.
    • Specific tests for vitamin deficiencies (B12, folate) and iron studies to assess levels and binding capacity.

Treatment Considerations for Anemia

  • Medications and Supplements: Depending on type of anemia, treatment may involve vitamin supplements, changes in diet, or other medications.
  • Understanding the root cause is crucial for effective treatment.
  • Nursing considerations include patient education and support regarding dietary changes and supplement adherence.