NR 507 Week 2 : NR 507 Week 2 Study Guide:
Anemia
Basics of Anemia: A normal hemoglobin level is 12.0– 17.0 g/dL (HGB mild 10-12, Moderate 6-
10, Severe below
6)
• Definition: Decreased red blood cells (RBCs) or hemoglobin → reduced oxygen delivery to
tissues.
• Symptoms: Pallor, Fatigue, shortness of breath, increased HR/RR, decreased BP, Cold
intolerance. (Module says); fatigue, pallor, muscle pain, increased respiratory rate, exertional
dyspnea, dizziness, and fainting.
Causes:
• Blood Loss (Acute or Chronic): -Menstruation -Trauma -Gastrointestinal lesions
• Decreased/Impaired RBC Production:
• Genetic defects: Thalassemia syndrome
• Nutritional deficiencies: B12, folate, iron
• Disease-related: Renal failure, acute leukemia, endocrine disorders
• Increased RBC Destruction (Hemolysis):
• Genetic disorders:
o Red cell membrane disorders (e.g., spherocytosis) o Enzyme
deficiencies (e.g., pyruvate kinase deficiency) o Hemoglobin
abnormalities (e.g., thalassemia, sickle cell disease)
• Acquired conditions:
o Antibody-mediated destruction (e.g., Rh disease, transfusion reactions,
autoimmune disorders)
o Infections (e.g., malaria)
o Cardiac traumatic hemolysis (e.g., defective cardiac valves)
,Microcytic Anemia
• Key Features: Small RBCs (low mean corpuscular volume, MCV).
• Causes:
o Iron deficiency anemia: Most common, due to poor diet, chronic bleeding, or
poor iron absorption.
o Thalassemia: Genetic disorders affecting hemoglobin production.
o Chronic diseases: Impact iron usage.
• Pathophysiology: Decreased hemoglobin synthesis due to iron, copper, or vitamin B-12
deficiencies.
Macrocytic Anemia:
• Key Features: Large RBCs (MCV > 100
fL).
• Causes:
o Vitamin B-12 or Folate deficiency: Requires intrinsic factor for absorption;
deficiency may cause neurological symptoms.
o Folate deficiency: Needed for DNA synthesis during RBC production.
• Pathophysiology: Impaired DNA synthesis → enlarged, immature RBC precursors
(megaloblasts).
Normocytic Anemia
• Key Features: Normal-sized RBCs (MCV 80-99 fL).
• Causes:
, o Chronic diseases: Cancer, Inflammation, kidney disease-kidney failure, hereditary
spherocytosis, G6PD deficiency, and paroxysmal nocturnal hemoglobinuria,
disrupted iron metabolism.
o Hemolysis or blood loss: High reticulocyte count indicates active RBC production.
o Bone marrow disorders: Impaired RBC production.
Hemoglobinopathies
• Sickle Cell Disease:
o Mutation → hemoglobin S (HbS) → sickled RBCs.
o Pathophysiology: Sickled cells break down quickly, leading to anemia.
o Complications: Splenic sequestration, vasoocclusive crises (pain and tissue ischemia),
chronic anemia.
Edapt.ai Module Questions and images part 1 Anemia
Question: Considering the pathophysiology of anemia, when arterial oxygen levels are low, the
kidneys increase the production and excretion of erythropoietin. This hormone stimulates the
bone marrow to increase red blood cell production to improve oxygen delivery to tissues.
Rationale:
• Decreased arterial oxygen levels results in tissue hypoxia.
• Tissue hypoxia stimulates the kidneys to increase production and excretion of
erythropoietin.
, • Erythropoietin binds to erythropoietin receptors in the bone marrow, resulting in increased
production of red blood cells.
• An increase in red blood cells often corrects tissue hypoxia.
• Improved tissue hypoxia signals the kidneys to reduce production and excretion of
erythropoietin to a normal level.
Rationale:
When the serum erythropoietin level is high, it is anticipated that the hematocrit will be low,
and when the serum erythropoietin level is low, it is anticipated that the hematocrit will be
high.
Increased production and excretion of erythropoietin is stimulated by tissue hypoxia, associated
with low hemoglobin and hematocrit levels. When hemoglobin and hematocrit levels are
normal, the production and excretion of erythropoietin returns to normal levels. When
hemoglobin and hematocrit levels are high, the production and excretion of erythropoietin is
low.
Anemia
Basics of Anemia: A normal hemoglobin level is 12.0– 17.0 g/dL (HGB mild 10-12, Moderate 6-
10, Severe below
6)
• Definition: Decreased red blood cells (RBCs) or hemoglobin → reduced oxygen delivery to
tissues.
• Symptoms: Pallor, Fatigue, shortness of breath, increased HR/RR, decreased BP, Cold
intolerance. (Module says); fatigue, pallor, muscle pain, increased respiratory rate, exertional
dyspnea, dizziness, and fainting.
Causes:
• Blood Loss (Acute or Chronic): -Menstruation -Trauma -Gastrointestinal lesions
• Decreased/Impaired RBC Production:
• Genetic defects: Thalassemia syndrome
• Nutritional deficiencies: B12, folate, iron
• Disease-related: Renal failure, acute leukemia, endocrine disorders
• Increased RBC Destruction (Hemolysis):
• Genetic disorders:
o Red cell membrane disorders (e.g., spherocytosis) o Enzyme
deficiencies (e.g., pyruvate kinase deficiency) o Hemoglobin
abnormalities (e.g., thalassemia, sickle cell disease)
• Acquired conditions:
o Antibody-mediated destruction (e.g., Rh disease, transfusion reactions,
autoimmune disorders)
o Infections (e.g., malaria)
o Cardiac traumatic hemolysis (e.g., defective cardiac valves)
,Microcytic Anemia
• Key Features: Small RBCs (low mean corpuscular volume, MCV).
• Causes:
o Iron deficiency anemia: Most common, due to poor diet, chronic bleeding, or
poor iron absorption.
o Thalassemia: Genetic disorders affecting hemoglobin production.
o Chronic diseases: Impact iron usage.
• Pathophysiology: Decreased hemoglobin synthesis due to iron, copper, or vitamin B-12
deficiencies.
Macrocytic Anemia:
• Key Features: Large RBCs (MCV > 100
fL).
• Causes:
o Vitamin B-12 or Folate deficiency: Requires intrinsic factor for absorption;
deficiency may cause neurological symptoms.
o Folate deficiency: Needed for DNA synthesis during RBC production.
• Pathophysiology: Impaired DNA synthesis → enlarged, immature RBC precursors
(megaloblasts).
Normocytic Anemia
• Key Features: Normal-sized RBCs (MCV 80-99 fL).
• Causes:
, o Chronic diseases: Cancer, Inflammation, kidney disease-kidney failure, hereditary
spherocytosis, G6PD deficiency, and paroxysmal nocturnal hemoglobinuria,
disrupted iron metabolism.
o Hemolysis or blood loss: High reticulocyte count indicates active RBC production.
o Bone marrow disorders: Impaired RBC production.
Hemoglobinopathies
• Sickle Cell Disease:
o Mutation → hemoglobin S (HbS) → sickled RBCs.
o Pathophysiology: Sickled cells break down quickly, leading to anemia.
o Complications: Splenic sequestration, vasoocclusive crises (pain and tissue ischemia),
chronic anemia.
Edapt.ai Module Questions and images part 1 Anemia
Question: Considering the pathophysiology of anemia, when arterial oxygen levels are low, the
kidneys increase the production and excretion of erythropoietin. This hormone stimulates the
bone marrow to increase red blood cell production to improve oxygen delivery to tissues.
Rationale:
• Decreased arterial oxygen levels results in tissue hypoxia.
• Tissue hypoxia stimulates the kidneys to increase production and excretion of
erythropoietin.
, • Erythropoietin binds to erythropoietin receptors in the bone marrow, resulting in increased
production of red blood cells.
• An increase in red blood cells often corrects tissue hypoxia.
• Improved tissue hypoxia signals the kidneys to reduce production and excretion of
erythropoietin to a normal level.
Rationale:
When the serum erythropoietin level is high, it is anticipated that the hematocrit will be low,
and when the serum erythropoietin level is low, it is anticipated that the hematocrit will be
high.
Increased production and excretion of erythropoietin is stimulated by tissue hypoxia, associated
with low hemoglobin and hematocrit levels. When hemoglobin and hematocrit levels are
normal, the production and excretion of erythropoietin returns to normal levels. When
hemoglobin and hematocrit levels are high, the production and excretion of erythropoietin is
low.
