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Types and Pathophysiology of Anemias Types of anemia Iron-deficiency anemia occurs when there is insufficient iron intake, chronic blood loss (menstrual bleeding), or decreased iron absorption in the gut, leading to impaired hemoglobin synthesis and smaller, pale red blood cells (microcytic, hypochromic anemia) Vitamin B12 deficiency anemia, also known as pernicious anemia, is an autoimmune condition that causes a lack of intrinsic factor, a protein necessary for B12 absorption in the ileum, resulting in impaired DNA synthesis and abnormally large, immature red blood cells (megaloblastic anemia) Folate-deficiency anemia is caused by inadequate dietary intake of folate (leafy greens), malabsorption disorders (celiac disease), or increased demand during pregnancy, leading to impaired DNA synthesis and megaloblastic anemia similar to B12 deficiency Aplastic anemia is a rare condition involving bone marrow failure, resulting in decreased production of all blood cell types (red blood cells, white blood cells, and platelets) due to toxins (benzene), radiation, medications (chemotherapy), or autoimmune disorders Hemolytic anemia occurs when red blood cells are prematurely destroyed faster than they can be replaced, either due to intrinsic factors (sickle cell disease, thalassemia) or extrinsic factors (autoimmune disorders, mechanical heart valves), leading to increased erythropoiesis in the bone marrow to compensate for the shortened red blood cell lifespan Clinical Manifestations and Diagnostic Tests Clinical features of anemia Common symptoms of anemia include fatigue, weakness, and shortness of breath due to decreased oxygen-carrying capacity of the blood, as well as pallor of the skin and mucous membranes (conjunctiva) due to reduced hemoglobin Patients may experience tachycardia (rapid heartbeat) and palpitations as the heart works harder to deliver oxygen to the tissues, along with dizziness or lightheadedness due to reduced blood flow to the brain Iron-deficiency anemia can cause koilonychia (spoon-shaped nails), angular cheilitis (cracks at the corners of the mouth), and glossitis (smooth, red tongue) due to epithelial changes Diagnostic tests show low serum iron, ferritin (iron stores), and transferrin saturation (iron transport protein), with high total iron-binding capacity (TIBC) Vitamin B12 and folate-deficiency anemias may present with neurological symptoms such as paresthesia (tingling sensation) and ataxia (impaired coordination) due to damage to the myelin sheath of nerves Blood smears reveal megaloblastic anemia with macrocytic (large) red blood cells and hypersegmented neutrophils (more than 5 lobes) Serum B12 or folate levels are low, with elevated homocysteine and methylmalonic acid (MMA) as metabolic markers of deficiency Aplastic anemia presents with pancytopenia (low counts of all blood cell types), and bone marrow biopsy shows hypocellularity (reduced cell numbers) confirming decreased production Hemolytic anemia may cause jaundice (yellowing of skin and eyes), dark urine, and splenomegaly (enlarged spleen) due to increased red blood cell destruction and bilirubin production Lab findings include elevated reticulocyte count (immature red blood cells), lactate dehydrogenase (LDH), and unconjugated bilirubin Autoimmune hemolytic anemia is diagnosed with a positive direct antiglobulin test (DAT), detecting antibodies on the surface of red blood cells Nursing Care Plans for Patients with Anemia Nursing care for anemia Assessment: Monitor vital signs (blood pressure, heart rate), oxygen saturation, and skin color to detect signs of anemia and its complications Assess for signs of bleeding (bruising, petechiae) or infection (fever, chills) that may worsen anemia Evaluate the patient's understanding of their condition and treatment plan to identify knowledge gaps Nursing diagnoses: Fatigue related to decreased oxygen-carrying capacity secondary to anemia Risk for injury related to dizziness and weakness resulting from anemia Deficient knowledge related to anemia management and self-care Interventions: Administer prescribed medications such as iron supplements (oral or intravenous), vitamin B12 injections (intramuscular), or folate tablets to correct specific nutrient deficiencies Encourage a balanced diet rich in essential nutrients (iron-rich foods, vitamin B12 sources, folate-containing vegetables) to support red blood cell production Provide education on the importance of medication adherence and follow-up appointments to monitor treatment response and prevent complications Assist with activities of daily living (bathing, dressing) and provide safety measures (handrails, non-slip mats) to prevent falls due to weakness and dizziness Monitor for transfusion reactions (fever, chills, urticaria) during blood transfusions and intervene promptly if reactions occur Evaluation: Assess the patient's response to treatment, such as increased energy levels, improved skin color, and normalized lab values (hemoglobin, hematocrit), to determine the effectiveness of interventions Modify the care plan as needed based on the patient's progress and changing needs, such as adjusting medication doses or providing additional education Polycythemia Vera Polycythemia vera overview Pathophysiology: Polycythemia vera is a myeloproliferative disorder characterized by the excessive production of red blood cells in the bone marrow, often accompanied by increased white blood cells and platelets The condition is caused by a mutation in the JAK2 gene, which leads to increased sensitivity to growth factors (erythropoietin) and uncontrolled cell proliferation The increased number of red blood cells results in higher blood viscosity and a greater risk of thrombosis (blood clots) Clinical presentation: Patients may have a ruddy (reddish) complexion, pruritus (itching) after warm showers, and splenomegaly (enlarged spleen) due to increased red blood cell mass Neurological symptoms such as headaches, dizziness, and visual disturbances (blurred vision) can occur due to hyperviscosity and reduced blood flow Thrombotic events are common complications, including deep vein thrombosis (DVT), pulmonary embolism (PE), stroke, and myocardial infarction (heart attack) Management: Phlebotomy (blood removal) is the primary treatment to reduce hematocrit levels and blood viscosity, typically performed every few months to maintain a target hematocrit below 45% Low-dose aspirin (81-100 mg daily) is prescribed to prevent thrombosis by inhibiting platelet aggregation Cytoreductive therapy with medications such as hydroxyurea (oral) or interferon-alpha (injectable) is used to suppress erythropoiesis and control cell proliferation Regular monitoring for complications and progression to myelofibrosis (bone marrow scarring) or acute leukemia is essential, with bone marrow biopsies and molecular testing as needed