NURS 3510 Module 5 Hematology
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Questions and Answers

What can result from acute, severe, or prolonged decreases from normal hemostasis?

abnormal hemostasis that presents as prolonged bleeding from minor trauma or spontaneous bleeding without injury

What are some underlying causes of platelet disorders?

Cancers, aplastic anemia, leukemia, lymphoma, myeloma, myelodysplastic disorders, marrow metastases, drugs, immune thrombocytopenia, infections, nutrition deficiencies, and radiation

What is a common mechanism of drug-related thrombocytopenia?

accelerated platelet destruction caused by antibodies

What is immune thrombocytopenia (ITP)?

<p>an acquired immune disorder where there is abnormal platelet destruction</p> Signup and view all the answers

What can cause increased platelet destruction?

<p>Artificial surfaces, disseminated intravascular coagulation, heparin-induced thrombocytopenia, pregnancy-related, thrombotic microangiopathy, and atypical hemolytic uremic syndromes</p> Signup and view all the answers

What is a common effect of massive blood transfusion or fluids on platelets?

<p>dilution</p> Signup and view all the answers

What is a possible inherited platelet disorder?

<p>Wiskott-Aldrich syndrome</p> Signup and view all the answers

What is a common cause of acquired platelet disorders?

<p>drugs</p> Signup and view all the answers

What is the significance of recent or excessive bleeding in health history assessment?

<p>It is a needed health history assessment to diagnose thrombocytopenia.</p> Signup and view all the answers

What laboratory study is used to diagnose or monitor hemolysis in thrombocytopenia?

<p>Haptoglobin, Hgb, indirect bilirubin, LDH, reticulocytes, and schistocytes.</p> Signup and view all the answers

What is the primary goal of nursing care for the patient with thrombocytopenia?

<p>That the patient will have no bleeding.</p> Signup and view all the answers

What is the significance of aPTT in diagnosing thrombocytopenia?

<p>It is a laboratory study used to diagnose or monitor coagulopathy in thrombocytopenia.</p> Signup and view all the answers

What is the purpose of history and physical assessment in diagnosing thrombocytopenia?

<p>To diagnose or monitor thrombocytopenia.</p> Signup and view all the answers

What is the significance of bone marrow aspiration and biopsy in diagnosing thrombocytopenia?

<p>It helps diagnose thrombocytopenia by examining the bone marrow.</p> Signup and view all the answers

What is the implication of impaired tissue perfusion in thrombocytopenia?

<p>It can cause organ shutdown or failure.</p> Signup and view all the answers

Why is it essential to prioritize the clinical problem of thrombocytopenia?

<p>To prevent bleeding and organ failure.</p> Signup and view all the answers

What is the immune-mediated response to heparin that leads to platelet destruction and vascular endothelial injury?

<p>Heparin-Induced Thrombocytopenia (HIT)</p> Signup and view all the answers

What complex binds to the platelet surface, leading to further platelet activation and release of more Platelet Factor 4 (PF4)?

<p>PF4-heparin complex</p> Signup and view all the answers

What laboratory tests can help diagnose Heparin-Induced Thrombocytopenia (HIT)?

<p>Specific assays such as ITP antigen-specific assay, platelet activation/function assay, or PF4-heparin complex for HIT</p> Signup and view all the answers

Why may a patient with HIT need a splenectomy?

<p>If they do not respond to treatment</p> Signup and view all the answers

What is the result of the positive feedback loop in Heparin-Induced Thrombocytopenia (HIT)?

<p>Thrombocytopenia and platelet-fibrin thrombi</p> Signup and view all the answers

What is the role of macrophages in the spleen in relation to platelets?

<p>They sequester and destroy platelets</p> Signup and view all the answers

What can be done to examine if production problems are the cause of thrombocytopenia?

<p>Bone marrow examination</p> Signup and view all the answers

What is the significance of prothrombin time (PT) and activated partial thromboplastin time (aPTT) in diagnosing Heparin-Induced Thrombocytopenia (HIT)?

<p>They can be normal even in severe thrombocytopenia</p> Signup and view all the answers

What is a common symptom of thrombocytopenia?

<p>Bleeding</p> Signup and view all the answers

What is the result of the spleen normally sequestering about one third of the platelets?

<p>Removal of the spleen increases the number of platelets in circulation</p> Signup and view all the answers

What is aplastic anemia characterized by?

<p>peripheral blood pancytopenia and hypocellular bone marrow</p> Signup and view all the answers

What is the main concern in acute blood loss?

<p>hypovolemic shock and reduced RBCs available to carry O2</p> Signup and view all the answers

What is the platelet count at which prolonged bleeding from trauma or injury usually occurs?

<p>Under 50,000/μL (50 × 109/L)</p> Signup and view all the answers

What is the main effect of chronic blood loss?

<p>depleted iron stores</p> Signup and view all the answers

What is the result of the platelet count being under 20,000/μL (20 × 109/L)?

<p>Spontaneous, life-threatening bleeding (e.g., intracranial bleeding) can occur</p> Signup and view all the answers

What is sickle cell anemia characterized by?

<p>abnormal form of Hgb in the RBC</p> Signup and view all the answers

What is a manifestation of internal blood loss in thrombocytopenia?

<p>Weakness, fainting, dizziness, tachycardia, abdominal pain, and hypotension</p> Signup and view all the answers

What may indicate thrombocytopenia?

<p>Prolonged bleeding after routine procedures, such as venipuncture or IM injection</p> Signup and view all the answers

What is the goal of managing chronic blood loss anemia?

<p>identifying and stopping the bleeding source</p> Signup and view all the answers

Why does antiplatelet antibody synthesis decrease after splenectomy?

<p>Because some antibody synthesis occurs in the spleen</p> Signup and view all the answers

What is the incidence rate of aplastic anemia in the United States?

<p>2 new cases per million people per year</p> Signup and view all the answers

What is the major complication of thrombocytopenia?

<p>Bleeding</p> Signup and view all the answers

How does the body respond to gradual acute blood loss?

<p>increasing plasma volume to maintain circulating fluid volume</p> Signup and view all the answers

What is a potential complication of aplastic anemia?

<p>bleeding and sepsis</p> Signup and view all the answers

What is megaloblastic anemia caused by, and what are the common causes?

<p>Megaloblastic anemia is caused by impaired DNA synthesis, resulting in defective RBC maturation. Common causes include cobalamin (vitamin B12) and folic acid deficiencies, congenital disorders, suppression of DNA synthesis by drugs, inborn errors of cobalamin and folic acid metabolism, and erythroleukemia.</p> Signup and view all the answers

What is pernicious anemia, and what is its most common age of diagnosis?

<p>Pernicious anemia is caused by an absence of intrinsic factor (IF). It occurs most often in persons of Northern European descent (especially Scandinavians) and Blacks, with the most common age of diagnosis being around 60 years.</p> Signup and view all the answers

What are the manifestations of folic acid deficiency, and how is it diagnosed?

<p>The manifestations of folic acid deficiency are similar to cobalamin deficiency, and include symptoms such as stomatitis, cheilosis, dysphagia, flatulence, and diarrhea. It is diagnosed with a low serum folate level (normal is 5 to 25 ng/mL or 11 to 57 nmol/L) and a normal serum cobalamin level.</p> Signup and view all the answers

What are the nursing measures for a patient with folic acid deficiency anemia?

<p>The nursing measures for a patient with folic acid deficiency anemia are the same as those for the patient with anemia, as outlined in Nursing Care Plan 34.1.</p> Signup and view all the answers

What is the usual dosage of folic acid replacement therapy?

<p>The usual dosage of folic acid replacement therapy is 1 to 5 mg/day by mouth.</p> Signup and view all the answers

What is the normal serum folate level?

<p>The normal serum folate level is 5 to 25 ng/mL (11 to 57 nmol/L).</p> Signup and view all the answers

What can cause neurologic symptoms in folic acid deficiency?

<p>Thiamine deficiency, which is often present with folate deficiency, can cause neurologic symptoms.</p> Signup and view all the answers

What is the significance of erythroleukemia in megaloblastic anemia?

<p>Erythroleukemia is a malignant blood disorder characterized by a proliferation of erythropoietic cells in bone marrow, which can cause megaloblastic anemia.</p> Signup and view all the answers

What is the most common nutrition disorder in the world, and who are the most susceptible individuals to this disorder?

<p>Iron deficiency anemia, and the most susceptible individuals are the very young, those on poor diets, and women in their reproductive years.</p> Signup and view all the answers

Describe the normal daily loss of iron in the body.

<p>1 mg of iron daily in urine, bile, sweat, sloughing of epithelial cells from the skin and intestinal mucosa, and minor bleeding.</p> Signup and view all the answers

What is anemia, and what are its common causes?

<p>A deficiency in the number of erythrocytes, the quantity or quality of hemoglobin, and/or volume of packed RBCs. Common causes include blood loss, impaired RBC production, or increased RBC destruction.</p> Signup and view all the answers

What is the underlying cause of thalassemia, and how does it affect RBC production?

<p>An absent or reduced globulin protein, which leads to inadequate production of normal Hgb, decreasing RBC production.</p> Signup and view all the answers

What is the characteristic of megaloblastic anemia, and why are these RBCs easily destroyed?

<p>Megaloblastic anemia is characterized by abnormally large (macrocytic) RBCs, which are easily destroyed because they have fragile cell membranes.</p> Signup and view all the answers

What are the two classifications of anemia, and how do they differ?

<p>Morphologic classification is based on RBC size and color, while etiologic classification is based on the clinical condition causing the anemia.</p> Signup and view all the answers

What is the effect of defective deoxyribonucleic acid (DNA) synthesis in RBCs?

<p>Defective DNA synthesis in RBCs can lead to megaloblastic anemias.</p> Signup and view all the answers

What is the normal life span of an RBC, and what is the balance that ensures an adequate number of RBCs?

<p>The normal life span of an RBC is 120 days. The balance between RBC production (erythropoiesis) and RBC destruction and loss ensures an adequate number of RBCs.</p> Signup and view all the answers

What is aplastic anemia characterized by?

<p>Aplastic anemia is characterized by diminished availability of RBC precursors.</p> Signup and view all the answers

What are the types of anemia caused by decreased RBC production, and what are their causes?

<p>Types of anemia caused by decreased RBC production include anemia caused by decreased RBC production. Causes include impaired erythropoiesis, inadequate iron intake, and bone marrow disorders.</p> Signup and view all the answers

How do the causes of anemia affect the classification and diagnosis of the condition?

<p>The causes of anemia, such as blood loss, impaired RBC production, or increased RBC destruction, affect the classification and diagnosis of the condition.</p> Signup and view all the answers

What is the result of anemia of chronic disease?

<p>Decreased RBC production.</p> Signup and view all the answers

What is the role of the CBC, reticulocyte count, and peripheral blood smear in the diagnosis of anemia?

<p>These laboratory tests help diagnose anemia by providing information on RBC count, hemoglobin level, and RBC morphology.</p> Signup and view all the answers

What are the three problems that can lead to decreased RBC production?

<p>Decreased Hgb synthesis, defective DNA synthesis, and diminished availability of RBC precursors.</p> Signup and view all the answers

How do morphologic and etiologic classifications of anemia relate to patient care?

<p>Morphologic classification provides an accurate classification of anemia, while etiologic classification helps identify the underlying cause and inform patient care.</p> Signup and view all the answers

What is the significance of understanding the causes of anemia in developing effective treatment and management strategies?

<p>Understanding the causes of anemia is crucial for developing effective treatment and management strategies tailored to the specific type and severity of anemia.</p> Signup and view all the answers

What is the primary concern in acute blood loss?

<p>Hypovolemic shock</p> Signup and view all the answers

What is the main effect of chronic blood loss?

<p>Iron deficiency anemia</p> Signup and view all the answers

What is the characteristic of sickle cell anemia?

<p>Abnormal form of hemoglobin in the RBCs</p> Signup and view all the answers

What is aplastic anemia characterized by?

<p>Peripheral blood pancytopenia and hypocellular bone marrow</p> Signup and view all the answers

What is the goal of managing chronic blood loss anemia?

<p>Identifying and stopping the bleeding source</p> Signup and view all the answers

What is the incidence rate of aplastic anemia in the United States?

<p>2 new cases per million people per year</p> Signup and view all the answers

What is the result of the platelet count being under 20,000/μL (20 × 109/L)?

<p>Prolonged bleeding from trauma or injury</p> Signup and view all the answers

How does the body respond to gradual acute blood loss?

<p>Increases plasma volume to maintain blood volume</p> Signup and view all the answers

What is the action of Vitamin B12 in the body, and how is it related to RBC production?

<p>Needed for RBC production and DNA synthesis.</p> Signup and view all the answers

What is the purpose of Epoetin Alfa, and how does it trigger the bone marrow to produce more RBCs?

<p>Triggers the bone marrow to produce more RBCs.</p> Signup and view all the answers

What are the expected outcomes for a patient with leukemia who is receiving treatment for anemia?

<p>Improved hemoglobin and hematocrit levels, decrease of anemia symptoms, adequate nutritional intake, adherence to plan of care, improved energy and activity, absence of anemic complications.</p> Signup and view all the answers

What is the definition of Thrombocytopenia, and what is the normal platelet count?

<p>Thrombocytopenia is a reduction of platelets to less than 150,000/μL (150 × 10^9/L).</p> Signup and view all the answers

What is the importance of patient education for a patient with anemia, and what should the patient be educated on?

<p>Medication adherence, dietary deficiencies, and the importance of including leafy green vegetables, fortified cereals, fruits, and meat, dairy products, and eggs in their diet.</p> Signup and view all the answers

What is the role of Epoetin Alfa in treating anemia, and how does it affect the bone marrow?

<p>Triggers the bone marrow to produce more RBCs.</p> Signup and view all the answers

What is the importance of monitoring blood pressure, reporting leg pain and chest pain, and adhering to medication regimen and diagnostic testing for a patient receiving Epoetin Alfa?

<p>To monitor hemoglobin levels and prevent complications.</p> Signup and view all the answers

What are the expected outcomes for a patient with anemia who is receiving treatment, and what are the key indicators of successful treatment?

<p>Improved hemoglobin and hematocrit levels, decrease of anemia symptoms, adequate nutritional intake, adherence to plan of care, improved energy and activity, absence of anemic complications.</p> Signup and view all the answers

What is megaloblastic anemia caused by, and what are the common causes?

<p>Megaloblastic anemia is caused by impaired DNA synthesis, which results in defective RBC maturation. Common causes include cobalamin (vitamin B12) and folic acid deficiencies, congenital disorders, suppression of DNA synthesis by drugs, inborn errors of cobalamin and folic acid metabolism, and erythroleukemia.</p> Signup and view all the answers

What is pernicious anemia, and what is its most common age of diagnosis?

<p>Pernicious anemia is a disease caused by an absence of intrinsic factor. It usually occurs in middle age or later, with 60 years being the most common age at diagnosis.</p> Signup and view all the answers

What are the manifestations of folic acid deficiency, and how is it diagnosed?

<p>The manifestations of folic acid deficiency are similar to cobalamin deficiency and include GI problems such as stomatitis, cheilosis, dysphagia, flatulence, and diarrhea. It is diagnosed by a low serum folate level (normal is 5 to 25 ng/mL [11 to 57 nmol/L]) with a normal serum cobalamin level.</p> Signup and view all the answers

What is the usual dosage of folic acid replacement therapy?

<p>The usual dosage of folic acid replacement therapy is 1 to 5 mg/day by mouth.</p> Signup and view all the answers

What is the significance of erythroleukemia in megaloblastic anemia?

<p>Erythroleukemia is a malignant blood disorder characterized by a proliferation of erythropoietic cells in bone marrow, which can cause megaloblastic anemia.</p> Signup and view all the answers

What are the nursing measures for a patient with folic acid deficiency anemia?

<p>The nursing measures for a patient with folic acid deficiency anemia are similar to those for the patient with anemia, as discussed in eNursing Care Plan 34.1.</p> Signup and view all the answers

What can cause neurologic symptoms in folic acid deficiency?

<p>Thiamine deficiency, which is often present with folate deficiency, can cause neurologic symptoms.</p> Signup and view all the answers

What is the normal serum folate level?

<p>The normal serum folate level is 5 to 25 ng/mL (11 to 57 nmol/L).</p> Signup and view all the answers

What is the most common nutrition disorder in the world, and who are the most susceptible individuals to this disorder?

<p>Iron deficiency anemia; the very young, those on poor diets, and women in their reproductive years.</p> Signup and view all the answers

What is the normal daily loss of iron in the body?

<p>1 mg of iron daily in urine, bile, sweat, sloughing of epithelial cells from the skin and intestinal mucosa, and minor bleeding.</p> Signup and view all the answers

What is the result of defective DNA synthesis in RBCs?

<p>Megaloblastic anemia</p> Signup and view all the answers

What is thalassemia, and what is its effect on RBC production?

<p>Thalassemia is a group of diseases involving inadequate production of normal Hgb, which decreases RBC production.</p> Signup and view all the answers

What is the characteristic of RBCs in megaloblastic anemia?

<p>Abnormally large (macrocytic) RBCs.</p> Signup and view all the answers

What is the effect of aplastic anemia on RBC precursors?

<p>Diminished availability of RBC precursors.</p> Signup and view all the answers

What is the common location of thalassemia occurrence?

<p>Near the Mediterranean Sea and equatorial or near-equatorial regions of Southeastern Asia, the Middle East, India, Pakistan, China, Southern Russia, and Africa.</p> Signup and view all the answers

What is the effect of hemolysis on RBCs in thalassemia?

<p>Destruction of RBCs by macrophages in the spleen.</p> Signup and view all the answers

What is the primary cause of anemia, and what are the three main categories of its causes?

<p>The primary cause of anemia is a deficiency in the number of erythrocytes (red blood cells), the quantity or quality of hemoglobin, or the volume of packed RBCs. The three main categories of its causes are: blood loss, impaired RBC production, or increased RBC destruction.</p> Signup and view all the answers

What is the normal life span of an RBC, and how is the balance of RBC production and destruction maintained?

<p>The normal life span of an RBC is 120 days. The balance of RBC production and destruction is maintained through a process called erythropoiesis, where RBC production is in equilibrium with RBC destruction and loss.</p> Signup and view all the answers

What is the difference between morphologic and etiologic classification of anemia, and which one is more accurate?

<p>Morphologic classification is based on RBC size and color, while etiologic classification is based on the clinical condition causing the anemia. Morphologic classification is more accurate, but etiologic classification is more practical for patient care.</p> Signup and view all the answers

What is the primary cause of iron deficiency anemia, and what are the common manifestations of this condition?

<p>The primary cause of iron deficiency anemia is inadequate iron intake, increased iron demand, or chronic blood loss. The common manifestations of this condition include fatigue, pale skin, and shortness of breath.</p> Signup and view all the answers

What is thalassemia, and what are the common manifestations of this condition?

<p>Thalassemia is a genetic disorder that affects the production of hemoglobin, leading to anemia. The common manifestations of this condition include severe anemia, fatigue, and jaundice.</p> Signup and view all the answers

What is megaloblastic anemia, and what are the common causes of this condition?

<p>Megaloblastic anemia is a type of anemia characterized by the production of large, immature RBCs. The common causes of this condition include vitamin B12 deficiency, folic acid deficiency, and certain medications.</p> Signup and view all the answers

What is anemia of chronic disease, and what are the common causes of this condition?

<p>Anemia of chronic disease is a type of anemia that occurs in individuals with chronic inflammatory conditions, such as rheumatoid arthritis or cancer. The common causes of this condition include chronic inflammation, which leads to the suppression of erythropoiesis.</p> Signup and view all the answers

What is the significance of erythropoiesis in the development of anemia, and how can it be affected by various diseases?

<p>Erythropoiesis is the process of RBC production, and it plays a critical role in maintaining a healthy RBC count. Various diseases, such as chronic inflammatory conditions, can affect erythropoiesis, leading to anemia.</p> Signup and view all the answers

What is the primary effect of chronic blood loss on the body's ability to transport oxygen?

<p>A significant decrease in the number of RBCs available to carry O2</p> Signup and view all the answers

How does the body respond to gradual acute blood loss?

<p>The body maintains its blood volume by slowly increasing the plasma volume</p> Signup and view all the answers

What is the main goal of managing chronic blood loss anemia?

<p>Identifying the source of bleeding and stopping it, followed by iron supplements if necessary</p> Signup and view all the answers

What is the characteristic of sickle cell anemia?

<p>An abnormal form of Hgb in the RBCs</p> Signup and view all the answers

What is the significance of iron deficiency in chronic blood loss?

<p>Depleted iron stores lead to a decrease in RBC production</p> Signup and view all the answers

How does aplastic anemia affect the bone marrow?

<p>Hypocellular bone marrow</p> Signup and view all the answers

What is the main concern in acute blood loss?

<p>Hypovolemic shock</p> Signup and view all the answers

What is the incidence rate of aplastic anemia in the United States?

<p>2 new cases per million people per year</p> Signup and view all the answers

What is the mechanism of action of Epoetin Alfa, and how does it benefit patients with anemia?

<p>Epoetin Alfa triggers the bone marrow to produce more RBCs, which increases hemoglobin and hematocrit levels, and decreases anemia symptoms.</p> Signup and view all the answers

What is the significance of Vitamin B12 in RBC production and DNA synthesis, and what are the consequences of its deficiency?

<p>Vitamin B12 is necessary for RBC production and DNA synthesis, and its deficiency can lead to anemia, fatigue, and neurological symptoms.</p> Signup and view all the answers

What are the expected outcomes of treatment for anemia, and how can they be achieved?

<p>The expected outcomes are improved hemoglobin and hematocrit levels, decreased anemia symptoms, adequate nutritional intake, adherence to the plan of care, and improved energy and activity. These can be achieved through medication adherence, dietary changes, and regular monitoring of hemoglobin levels.</p> Signup and view all the answers

What is the definition of Thrombocytopenia, and what are its implications for patients?

<p>Thrombocytopenia is a reduction of platelets to less than 150,000/μL, which can lead to increased risk of bleeding and bruising.</p> Signup and view all the answers

What is the role of folic acid in the prevention of megaloblastic anemia, and what are the manifestations of its deficiency?

<p>Folic acid is essential for the production of RBCs, and its deficiency can lead to megaloblastic anemia, characterized by fatigue, weakness, and neurological symptoms.</p> Signup and view all the answers

What is the significance of iron in erythropoiesis, and what are the consequences of its deficiency?

<p>Iron is essential for the production of hemoglobin, and its deficiency can lead to iron deficiency anemia, characterized by fatigue, weakness, and pale skin.</p> Signup and view all the answers

What is the pathophysiology of anemia of chronic disease, and how does it differ from other types of anemia?

<p>Anemia of chronic disease is a condition characterized by decreased RBC production due to chronic inflammation, and it differs from other types of anemia in that it is not caused by iron or Vitamin B12 deficiency.</p> Signup and view all the answers

What is the genetic basis of thalassemia, and how does it affect RBC production?

<p>Thalassemia is a genetic disorder that affects the production of hemoglobin, leading to abnormal RBC production and anemia.</p> Signup and view all the answers

Study Notes

Thrombocytopenia

  • Acute, severe, or prolonged decreases from normal can result in abnormal hemostasis, presenting as prolonged bleeding from minor trauma or spontaneous bleeding without injury
  • Causes of platelet disorders:
    • Cancers and other disorders
    • Aplastic anemia
    • Leukemia, lymphoma, myeloma, myelodysplastic disorders
    • Marrow metastases by solid tumors
    • Drugs (chemotherapy, others)
    • Immune thrombocytopenia (ITP)
    • Infections (bacterial, fungal, viral)
    • Nutrition deficiencies, alcohol use
    • Radiation

Increased Platelet Destruction

  • Artificial surfaces (e.g., cardiopulmonary bypass, hemodialysis)
  • Disseminated intravascular coagulation (DIC)
  • Heparin-induced thrombocytopenia (HIT)
  • Pregnancy-related
  • Thrombotic microangiopathy
  • Atypical hemolytic uremic syndromes (aHUSs)
  • Thrombotic thrombocytopenic purpura (TTP)

Abnormal Platelet Distribution

  • Dilution (massive blood transfusion, fluids)
  • Splenic sequestration

Immune Thrombocytopenia (ITP)

  • Most commonly acquired thrombocytopenia
  • Acquired immune disorder where there is abnormal platelet destruction
  • Antibody synthesis occurs in the spleen, so antiplatelet antibodies decrease after splenectomy
  • Spleen normally sequesters about one-third of platelets, so its removal increases the number of platelets in circulation

Clinical Manifestations of Thrombocytopenia

  • Bleeding (mucosal, cutaneous, internal)
  • Petechiae, purpura, or bruising
  • Pain and tenderness
  • Insidious or acute bleeding from trauma or injury
  • Prolonged bleeding from minor trauma or spontaneous bleeding
  • Life-threatening bleeding (e.g., intracranial bleeding) can occur when platelet count is under 20,000/μL (20 × 109/L)

Laboratory Studies for Thrombocytopenia

  • Platelets
  • Hemolysis tests (haptoglobin, Hgb, indirect bilirubin, LDH, reticulocytes, schistocytes)
  • Coagulopathy tests (PT, aPTT, D dimer)
  • Urinalysis (for proteinuria, hematuria)
  • Creatinine
  • ADAMTS13 assay
  • PF4-heparin complex assay

Diagnostic Tests for Thrombocytopenia

  • History and physical assessment
  • Bone marrow aspiration and biopsy
  • CBC, including platelet count

Nursing Goals for Thrombocytopenia

  • Patient will have no bleeding
  • Patient will maintain vascular integrity
  • Patient will manage self-care related to increased risk for bleeding

Megaloblastic Anemias

  • Caused by impaired DNA synthesis, resulting in defective RBC maturation
  • Most common causes: cobalamin (vitamin B12) and folic acid deficiencies
  • Can also occur due to congenital disorders, suppression of DNA synthesis by drugs, inborn errors of cobalamin and folic acid metabolism, and erythroleukemia

Pernicious Anemia

  • Caused by an absence of intrinsic factor (IF)
  • Disease of insidious onset, typically beginning in middle age or later (after age 40)
  • Most common in persons of Northern European descent (especially Scandinavians) and Blacks

Folic Acid Deficiency

  • Causes megaloblastic anemia
  • Folic acid is needed for DNA synthesis leading to RBC formation and maturation
  • Common causes of folic acid deficiency include:
    • Inadequate dietary intake
    • Malabsorption
    • Increased demand (e.g., pregnancy, inflammatory bowel disease)
    • Impaired utilization (e.g., liver disease, cancer)
  • Symptoms: similar to cobalamin deficiency, including insidious onset, GI problems, and neurologic symptoms
  • Diagnostic findings: low serum folate level (normal: 5-25 ng/mL or 11-57 nmol/L), normal serum cobalamin level
  • Treatment: replacement therapy with 1-5 mg/day oral folic acid, with duration depending on the reason for the deficiency

Problems Leading to Decreased RBC Production

  • Decreased Hgb synthesis: iron deficiency anemia, thalassemia, and sideroblastic anemia
  • Defective DNA synthesis in RBCs: cobalamin deficiency, folic acid deficiency, and megaloblastic anemias
  • Diminished availability of RBC precursors: aplastic anemia and anemia of chronic disease

Iron Deficiency Anemia

  • Most common nutrition disorder in the world
  • Those most susceptible: very young, those on poor diets, and women in their reproductive years
  • Normally, 1 mg of iron lost daily in urine, bile, sweat, sloughing of epithelial cells from the skin and intestinal mucosa, and minor bleeding

Thalassemia

  • Group of diseases involving inadequate production of normal Hgb, decreasing RBC production
  • Due to absent or reduced globulin protein (α-globin chains in α-thalassemia, β-globin chains in β-thalassemia)
  • Hemolysis occurs as mononuclear phagocytes in the marrow destroy most erythroblasts
  • Commonly found in persons of Mediterranean, Southeastern Asian, Middle Eastern, Indian, Pakistani, Chinese, and African descent

Megaloblastic Anemia

  • Characterized by the presence of abnormally large (macrocytic) RBCs
  • Macrocytic RBCs are easily destroyed due to fragile cell membranes

Thrombocytopenia

  • Reduction of platelets to less than 150,000/μL (150 × 10^9/L)

Anemia

  • Deficiency in the number of erythrocytes (RBCs), the quantity or quality of hemoglobin (Hgb), and/or volume of packed RBCs (hematocrit)
  • Not a specific disease, but a manifestation of a pathologic process
  • Common condition with many diverse causes, including blood loss, impaired RBC production, or increased RBC destruction

Megaloblastic Anemias

  • Caused by impaired DNA synthesis, resulting in defective RBC maturation
  • Most common causes: cobalamin (vitamin B12) and folic acid deficiencies
  • Can also occur due to congenital disorders, suppression of DNA synthesis by drugs, inborn errors of cobalamin and folic acid metabolism, and erythroleukemia

Pernicious Anemia

  • Caused by an absence of intrinsic factor (IF)
  • Disease of insidious onset, typically beginning in middle age or later (after age 40)
  • Most common in persons of Northern European descent (especially Scandinavians) and Blacks

Folic Acid Deficiency

  • Causes megaloblastic anemia
  • Folic acid is needed for DNA synthesis leading to RBC formation and maturation
  • Common causes of folic acid deficiency include:
    • Inadequate dietary intake
    • Malabsorption
    • Increased demand (e.g., pregnancy, inflammatory bowel disease)
    • Impaired utilization (e.g., liver disease, cancer)
  • Symptoms: similar to cobalamin deficiency, including insidious onset, GI problems, and neurologic symptoms
  • Diagnostic findings: low serum folate level (normal: 5-25 ng/mL or 11-57 nmol/L), normal serum cobalamin level
  • Treatment: replacement therapy with 1-5 mg/day oral folic acid, with duration depending on the reason for the deficiency

Problems Leading to Decreased RBC Production

  • Decreased Hgb synthesis: iron deficiency anemia, thalassemia, and sideroblastic anemia
  • Defective DNA synthesis in RBCs: cobalamin deficiency, folic acid deficiency, and megaloblastic anemias
  • Diminished availability of RBC precursors: aplastic anemia and anemia of chronic disease

Iron Deficiency Anemia

  • Most common nutrition disorder in the world
  • Those most susceptible: very young, those on poor diets, and women in their reproductive years
  • Normally, 1 mg of iron lost daily in urine, bile, sweat, sloughing of epithelial cells from the skin and intestinal mucosa, and minor bleeding

Thalassemia

  • Group of diseases involving inadequate production of normal Hgb, decreasing RBC production
  • Due to absent or reduced globulin protein (α-globin chains in α-thalassemia, β-globin chains in β-thalassemia)
  • Hemolysis occurs as mononuclear phagocytes in the marrow destroy most erythroblasts
  • Commonly found in persons of Mediterranean, Southeastern Asian, Middle Eastern, Indian, Pakistani, Chinese, and African descent

Megaloblastic Anemia

  • Characterized by the presence of abnormally large (macrocytic) RBCs
  • Macrocytic RBCs are easily destroyed due to fragile cell membranes

Thrombocytopenia

  • Reduction of platelets to less than 150,000/μL (150 × 10^9/L)

Anemia

  • Deficiency in the number of erythrocytes (RBCs), the quantity or quality of hemoglobin (Hgb), and/or volume of packed RBCs (hematocrit)
  • Not a specific disease, but a manifestation of a pathologic process
  • Common condition with many diverse causes, including blood loss, impaired RBC production, or increased RBC destruction

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This quiz covers the causes and effects of thrombocytopenia, including cancers, anemia, leukemia, and more. Learn about the disorders that can lead to abnormal hemostasis and bleeding.

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