NCLEX Review Guide: Anemia

Definition and Classification

• Anemia is defined as a reduction in the total number of red blood cells (RBCs), the quantity of hemoglobin, or the volume of packed RBCs (hematocrit) below established reference values for age and gender.
• Classified based on etiology (blood loss, decreased production, increased destruction), morphology (microcytic, normocytic, macrocytic), or pathophysiology (iron deficiency, vitamin deficiency, hemolysis).

Common Types of Anemia

• Iron Deficiency Anemia: Most common type, characterized by microcytic, hypochromic RBCs due to inadequate iron for hemoglobin synthesis. Often caused by chronic blood loss, poor dietary intake, or malabsorption.
• Vitamin B12 Deficiency (Pernicious) Anemia: Macrocytic anemia caused by lack of intrinsic factor needed for B12 absorption, leading to megaloblastic changes and neurological symptoms.
• Folate Deficiency Anemia: Macrocytic anemia similar to B12 deficiency but without neurological symptoms, often seen in pregnancy, alcoholism, or malnutrition.
• Hemolytic Anemia: Results from premature destruction of RBCs, can be inherited (sickle cell, thalassemia) or acquired (autoimmune, mechanical trauma).
• Aplastic Anemia: Pancytopenia resulting from bone marrow failure to produce sufficient blood cells, often idiopathic or following toxic exposure.

General Signs and Symptoms

• Common manifestations include fatigue, weakness, pallor, shortness of breath, tachycardia, and decreased exercise tolerance due to reduced oxygen-carrying capacity.
• Severe anemia may present with high-output cardiac failure, characterized by bounding pulse, systolic flow murmurs, and potential heart failure.

Type-Specific Manifestations

• Iron Deficiency Anemia: Pica (craving for non-food substances), koilonychia (spoon-shaped nails), glossitis (inflamed tongue), angular cheilitis (cracks at corners of mouth).
• Vitamin B12 Deficiency: Neurological symptoms including paresthesia, ataxia, loss of position and vibration sense, and potential dementia; glossitis with "beefy red" tongue.
• Sickle Cell Anemia: Acute pain crises, susceptibility to infections, delayed growth, priapism, stroke, acute chest syndrome, and chronic organ damage.
• Aplastic Anemia: Pancytopenia leading to fatigue, increased infections (neutropenia), and bleeding/bruising (thrombocytopenia).

Laboratory Tests

• Complete Blood Count (CBC): Initial screening test showing decreased hemoglobin, hematocrit, and RBC count; provides RBC indices including MCV, MCH, and MCHC to classify anemia type.
• Peripheral Blood Smear: Reveals morphological changes in RBCs (microcytic, macrocytic, hypochromic, target cells, sickle cells, etc.).
• Iron Studies: Serum iron, ferritin, total iron-binding capacity (TIBC), and transferrin saturation help diagnose iron deficiency anemia.
• Vitamin Levels: Serum B12, folate, and methylmalonic acid levels for diagnosing deficiency anemias.
• Hemolysis Tests: Reticulocyte count, haptoglobin, LDH, and indirect bilirubin to evaluate for hemolytic anemia.

B12 Deficiency vs. Folate Deficiency

Iron Deficiency Anemia vs. Anemia of Chronic Disease

Sickle Cell Trait vs. Sickle Cell Disease

Assessment

• Conduct comprehensive health history focusing on symptoms, dietary habits, medication use, family history, and bleeding history.
• Perform physical assessment with attention to vital signs, skin/mucous membrane color, cardiovascular status, respiratory effort, and specific manifestations based on suspected anemia type.

Nursing Interventions

1. Administer prescribed medications (iron supplements, vitamin B12, folate, erythropoietin) according to protocols.
2. Implement blood transfusion protocols when ordered, following proper identification procedures and monitoring for transfusion reactions.
3. Provide education on medication administration, particularly iron supplements (take with vitamin C, avoid antacids, may cause dark stools).
4. Implement energy conservation techniques for patients with fatigue.
5. Monitor laboratory values to evaluate treatment effectiveness.

Patient Education

• Provide dietary counseling for specific anemia types: iron-rich foods (red meat, leafy greens, legumes), B12 sources (animal products, fortified foods), folate sources (leafy greens, citrus).
• Educate on medication adherence, potential side effects, and importance of follow-up laboratory testing.
• Teach patients with hemolytic anemias about avoiding triggers and recognizing early signs of crisis.

NCLEX Priority Concepts

• Oxygenation: Understand how decreased hemoglobin affects oxygen delivery to tissues and resulting compensatory mechanisms.
• Perfusion: Focus on how anemia affects tissue perfusion and cardiovascular compensatory responses.
• Nutrition: Know nutritional deficiencies related to specific anemia types and appropriate dietary interventions.
• Cellular Regulation: Understand the pathophysiology of RBC production, lifespan, and destruction in various anemia types.

Common Pitfalls

• Confusing Lab Values: Remember that increased TIBC occurs in iron deficiency, while decreased TIBC occurs in anemia of chronic disease.
• Overlooking Neurological Assessment: Don't forget to assess for neurological symptoms in suspected B12 deficiency, as this distinguishes it from folate deficiency.
• Misunderstanding Reticulocyte Count: Low reticulocyte count with anemia indicates production problem; high count indicates appropriate bone marrow response to blood loss or hemolysis.

Quick Self-Assessment

• Anemia is defined as reduced hemoglobin, hematocrit, or RBC count below established reference values, classified by morphology (microcytic, normocytic, macrocytic) or etiology.
• Common types include iron deficiency (microcytic), B12/folate deficiency (macrocytic), anemia of chronic disease (normocytic), and hemolytic anemias.
• Key diagnostic tests include CBC with RBC indices, peripheral blood smear, iron studies, vitamin levels, and hemolysis markers.
• Nursing management focuses on addressing underlying cause, administering appropriate supplements or transfusions, patient education, and symptom management.
• Patient education should include dietary modifications, medication administration, energy conservation, and recognition of complications.