RBC, WBC, and Coagulation Disorders Flashcards
Anemia
Lower than normal hemoglobin concentration and reduced number of erythrocytes.
Causes of Anemia
- Inherited Hemolytic Anemia: Sickle cell disease, thalassemia.
- Red Blood Cell Membrane Abnormality: Acanthocytosis, hereditary elliptocytosis, hereditary spherocytosis, stomatocytosis.
- Enzyme Deficiencies: Glucose-6-phosphate dehydrogenase deficiency.
- Acquired Hemolytic Anemia: Antibody-related (autoimmune hemolytic anemia, isoantibody/transfusion reaction, cold agglutinin disease), not antibody-related (disseminated intravascular coagulation, hypersplenism, infection, liver disease, mechanical heart valve, microangiopathic hemolytic anemia, paroxysmal nocturnal hemoglobinuria, toxins, trauma, uremia).
Symptoms of anemia
Symptoms of anemia depend on factors like severity, rapidity of development, duration, metabolic requirements, and the presence of other conditions. Common manifestations include weakness, fatigue, pallor of the skin and mucous membranes, jaundice, angular cheilitis, brittle nails, and pica. Complications may include heart failure, paresthesias, and confusion.
Anemia assessment findings
- Laboratory Tests: Hemoglobin, hematocrit, reticulocyte count, RBC indices (MCV, RDW), iron studies, serum vitamin B12, folate levels, haptoglobin, erythropoietin levels, complete blood count (CBC).
- Additional Studies: Bone marrow aspiration, colonoscopy, upper endoscopy to identify underlying conditions causing anemia.
Anemia nursing interventions
- Managing Fatigue: Assist in prioritizing activities, establishing a balance between activity and rest, and addressing conditions contributing to fatigue.
- Maintaining Adequate Nutrition: Encourage a well-balanced diet, educate on the interference of alcohol with essential nutrients, and provide dietary supplements as prescribed.
- Managing Activity Intolerance: Monitor vital signs, pulse oximetry, adjust medications, and ensure appropriate fluid replacement.
- Promoting Effective Management of Prescribed Therapy: Educate patients on the purpose, administration, and potential side effects of prescribed medications. Support adherence to treatment plans and collaborate to address barriers.
- Monitoring and Managing Potential Complications: Assess for signs and symptoms of heart failure, perform neurologic assessments for megaloblastic anemias, and intervene promptly.
Iron deficiency Anemia
Iron deficiency anemia occurs when the intake of dietary iron is insufficient for hemoglobin synthesis. The body can store about one fourth to one third of its iron requirements, and anemia develops when these stores are depleted. Functional iron deficiency can occur when iron delivered to erythroid precursors is inadequate.
Iron deficiency causes
- Inadequate dietary iron intake.
- Blood loss, especially gastrointestinal bleeding, which is a common cause in men and postmenopausal women.
- Conditions such as ulcers, gastritis, tumors, inflammatory bowel disease, menorrhagia (excessive menstrual bleeding), and pregnancy with inadequate iron intake.
- Chronic alcohol abuse, use of aspirin, steroids, or nonsteroidal anti-inflammatory drugs (NSAIDs).
- Iron malabsorption, as seen after gastrectomy, bariatric surgery, celiac disease, and inflammatory bowel diseases.
Iron deficiency assessment findings
- Symptoms of anemia (weakness, fatigue).
- Severe or prolonged cases may show a smooth, red tongue; brittle and ridged nails; and angular cheilosis.
- Signs may subside after iron replacement therapy.
- Relevant history may include multiple pregnancies, GI bleeding, and pica.
Iron deficiency nursing interventions
- Preventive education for menstruating women and pregnant women.
- Encourage iron-rich foods with vitamin C for better absorption.
- Assist in selecting a healthy diet; provide nutritional counseling if needed.
- Instruct on the importance of continuing therapy until iron stores are replenished.
- Oral iron is best absorbed on an empty stomach; instruct patients on proper administration to minimize side effects.
- Educate on potential side effects and ways to manage them.
- Liquid iron may stain teeth; precautions can be taken.
- IV supplementation may be used in specific cases; nurses should be aware of the formulation and potential risks.
Iron deficiency tests ordered
- Definitive diagnosis through bone marrow aspiration (rarely done); stained aspirate reveals low or absent iron levels.
- Commonly diagnosed through laboratory tests: low serum ferritin levels, low serum iron, elevated total iron-binding capacity (TIBC), and small erythrocytes (decreased mean corpuscular volume - MCV).
Vitamin b12 defiency
Anemias associated with vitamin B12 deficiency result in megaloblastic changes in bone marrow and peripheral blood due to the crucial role of B12 in normal DNA synthesis. Megaloblastic red blood cells, along with abnormal nonlymphoid leukocytes and platelets, are produced. Bone marrow analysis shows hyperplasia, with large and irregular precursor erythroid and myeloid cells. Many abnormal cells are destroyed within the bone marrow, leading to insufficient mature cells entering the peripheral blood. Pancytopenia may develop over time.
Vitamin B12 deficiency causes
Vitamin B12 deficiency can result from:
- Inadequate dietary intake (rare, especially in vegans).
- Impaired absorption from the GI tract, common in older adults, inflammatory bowel disease, GI surgeries (ileal resection, bariatric surgery, gastrectomy), and the use of certain medications (metformin, histamine blockers, antacids, proton pump inhibitors).
- Absence of intrinsic factor, leading to pernicious anemia; intrinsic factor is necessary for vitamin B12 absorption and is typically secreted by cells in the gastric mucosa.
Vitamin b12 deficiency assessment findings
- Symptoms are gradual due to compensatory mechanisms; weakness, listlessness, and fatigue may not be apparent initially.
- Neurological manifestations specific to vitamin B12 deficiency include a smooth, sore, red tongue, mild diarrhea, confusion, paresthesias (numbness, tingling), difficulty maintaining balance, and loss of position sense (proprioception).
- Pallor, mild jaundice, and a pale-yellow skin color may be observed, especially in patients with light skin.
- Progressive neurologic symptoms with spontaneous partial remissions and exacerbations.
Vitamin B12 deficiency Nursing interventions
- Assessment includes inspection of skin, tongue, and mucous membranes for signs of megaloblastic anemia.
- Neurologic assessment for complications, including gait, coordination, and position sense.
- Referral to physical and occupational therapy for assistive devices and safety concerns.
- Instruction on soft bland foods for those with mouth and tongue soreness.
Vitamin B12 deficiency tests ordered
- Serum levels of vitamin B12 are analyzed.
- Elevated methylmalonic acid and homocysteine levels are more sensitive indicators of vitamin B12 deficiency.
- Intrinsic factor antibody test to determine the presence of pernicious anemia.
- Neurologic assessment includes tests of position, vibration sense, cognitive function, gait, and stability.
Folic acid deficiency anemia
Folic acid deficiency, like vitamin B12 deficiency, leads to megaloblastic changes in bone marrow and peripheral blood due to the essential role of folic acid in normal DNA synthesis. This results in abnormally large erythrocytes (megaloblastic red blood cells) and abnormal nonlymphoid leukocytes and platelets. Bone marrow analysis shows hyperplasia, with precursor erythroid and myeloid cells being large and irregular. Insufficient mature cells enter the peripheral blood, and over time, pancytopenia may develop.
Folic acid deficiency anemia causes
Folic acid deficiency can result from:
- Inadequate dietary intake, especially in individuals with a diet deficient in green vegetables and liver.
- Alcohol ingestion, which increases folic acid requirements and is common in those with alcohol abuse disorder.
- Conditions such as liver disease, chronic hemolytic anemias, and pregnancy, where erythrocyte production is increased.
- Small bowel diseases like celiac disease that interfere with normal folic acid absorption.
Folic acid deficiency anemia assessment findings
- Symptoms are similar to vitamin B12 deficiency, and both anemias may coexist.
- Gradual onset and progression, allowing the body to compensate until severe anemia.
- Pallor, mild jaundice, and a pale-yellow skin color may be observed, especially in patients with light skin.
- Neurological manifestations specific to vitamin B12 deficiency do not occur with folic acid deficiency.
- Symptoms are similar to vitamin B12 deficiency, and both anemias may coexist.
- Gradual onset and progression, allowing the body to compensate until severe anemia.
- Pallor, mild jaundice, and a pale-yellow skin color may be observed, especially in patients with light skin.
- Neurological manifestations specific to vitamin B12 deficiency do not occur with folic acid deficiency.
Folic acid deficiency anemia nursing interventions
- Assessment includes inspection of the skin, tongue, and mucous membranes for signs of megaloblastic anemia.
- Mild jaundice may be evident, especially in the sclera with natural lighting.
- Vitiligo and premature graying of the hair are common in those with folic acid deficiency.
- Careful neurologic assessment is important to identify complications.
- Safety concerns regarding impaired gait, coordination, and position sense.
- Physical and occupational therapy referrals may be needed for assistive devices.
- Instruction on choosing soft bland foods for those with mouth and tongue soreness.
Folic acid deficiency anemia labs ordered
- Serum levels of both folic acid and vitamin B12 are analyzed.
- Measurement of the amount of folate within red blood cells is a more sensitive test to determine true folate deficiency.
- Elevated homocysteine levels may be present in folic acid deficiency.
Aplastic anemia
Aplastic anemia is a rare disease characterized by a decrease in or damage to bone marrow stem cells, damage to the bone marrow microenvironment, and replacement of marrow with fat. Stem cell damage is mediated by the body’s T cells, leading to an attack on the bone marrow, resulting in aplasia and markedly reduced hematopoiesis. This condition leads to severe anemia, significant neutropenia, and thrombocytopenia.
Aplastic anemia causes
- Can be acquired, congenital (rare), or idiopathic (without an apparent cause).
- Associated with certain medications, chemicals (benzene, benzene derivatives), and radiation damage.
- Certain toxic materials like inorganic arsenic, glycol ethers, plutonium, and radon.
- Nonviral hepatitis may be a precipitating factor in about 10% of cases.
Aplastic anemia assessment findings
- Insidious onset with complications from bone marrow failure.
- Symptoms include fatigue, pallor, dyspnea, and purpura (bruising) due to thrombocytopenia.
- Lymphadenopathy and splenomegaly may occur.
- Retinal hemorrhages are common.
Aplastic anemia nursing interventions
- Thorough assessment for signs of infection and bleeding.
- Monitoring for side effects of therapy, including hypersensitivity reactions during ATG administration.
- Monitoring long-term effects of cyclosporine therapy.
- Patient education on drug–drug interactions and the importance of not stopping immunosuppressive therapy abruptly.
Aplastic anemia tests ordered
- CBC reveals pancytopenia (lower-than-normal counts of erythrocytes, neutrophils, and platelets).
- Neutrophil counts less than 1,500/mm³, hemoglobin less than 10 g/dL, and platelet counts less than 50,000/mm³.
- Bone marrow biopsy typically shows an extremely hypoplastic or aplastic bone marrow, often replaced with fat.
Polycythemia Vera
Polycythemia vera is the most common of the three Philadelphia chromosome-negative myeloproliferative disorders. It is characterized by hypercellular bone marrow, leading to elevated counts of erythrocytes, leukocytes, and platelets in the peripheral blood. Erythrocyte elevation predominates, and hematocrit can exceed 60% in some cases.
Polycythemia vera causes
The exact cause is not mentioned in the passage, but it is associated with a mutation of the JAK2 gene.
Polycythemia Vera assessment findings
- Variable symptoms; some patients may be asymptomatic at initial diagnosis.
- Symptoms related to erythrocytosis: neurologic symptoms (headache, dizziness, vision changes), abdominal symptoms (early satiety, abdominal discomfort/pain), cardiovascular symptoms (ruddy complexion, angina, claudication, dyspnea, hypertension, thrombophlebitis), constitutional symptoms (fatigue, night sweats).
- Pruritus, erythromelalgia (burning, painful sensation, erythema in fingers or toes).
- Elevated uric acid leading to gout and renal stone formation.
Polycythemia Vera nursing interventions
- Management of fatigue includes pharmacologic agents and nonpharmacologic treatments.
- Pruritus management includes antihistamines, emollient lotion, SSRIs, interferon-alfa, and narrow band ultraviolet B phototherapy.
- Thrombosis and bleeding risk assessments, lifestyle modifications, and education about signs and symptoms are crucial.
- Avoidance of iron supplements is emphasized to prevent further stimulation of RBC production.
Polycythemia Vera labs ordered
- Diagnosis based on clinical symptoms, laboratory findings, and the presence of a mutation of the JAK2 gene.
- Assessment includes palpation of the spleen, history of thrombotic events, blood transfusions, or medications associated with causing erythrocytosis.
- Patients with the JAK2 mutation who do not meet the criteria for a diagnosis of polycythemia vera may have “masked polycythemia vera,” which has a poorer overall rate of survival.
Neutropenia
Neutropenia is defined as a neutrophil count less than 2,000/mm3. It results from either decreased production of neutrophils or increased destruction of cells. Neutrophils play a crucial role in preventing and limiting bacterial infections.