Blood and Blood Disorders – Comprehensive Study Notes

Quiz logistics and tutoring

  • Quiz one: on the cells and one topic from this PowerPoint. Topic announced by instructor; 10 questions total.
  • First quiz will be taken in person; after that, group quizzes and take-home quizzes may occur depending on instructor's plan.
  • Tutoring available: Katie Sykes (Capo tutor) in the building today from 04:30–06:30 in Room 359 (Third Floor).
  • Katie has access to class materials and PowerPoints; she knows what’s on the quiz and can walk through key concepts (not a direct answer dump).
  • Zoom option may be available for off-campus students; contact Katie if needed.
  • Any questions about logistics? The instructor is available for clarifications.

Blood basics: components, homeostasis, and oxygen transport

  • Blood is required to sustain life and works with the lymphatic system to transport nutrients.
  • Main components of blood: red blood cells (RBCs), white blood cells (WBCs), and platelets.
  • Total blood volume in a typical adult: 5\,\text{L}.
  • Homeostasis is necessary to maintain life.

Red blood cells (RBCs) / Erythrocytes

  • Erythrocytes = mature red blood cells (adult cells).
  • Primary function: transport oxygen throughout the body.
  • Oxygen-carrying capacity is measured by hemoglobin (Hb).
  • In the transcript, hemoglobin is referred to as Hb (with a note that it’s sometimes written as HGV in class material).
  • Hemoglobin carries 4 oxygen molecules per molecule: \text{Hb carries } 4\ \text{O}_2\text{ molecules}.
  • Hematocrit: another measurement, representing the fraction of blood volume occupied by RBCs (total RBCs in the blood).
  • Blood that is brighter red indicates higher oxygen content.
  • RBC production: erythropoiesis occurs in bone marrow.
  • Regulation of RBC production (erythropoiesis) is driven by oxygen needs, primarily determined by the kidneys and to a lesser extent the liver.
  • Erythropoietin (from the kidneys) stimulates bone marrow to produce more RBCs when oxygen levels are low.

Anemia and RBC production disorders

  • Anemia = decrease in circulating RBCs.
  • Causes: blood loss or premature destruction of RBCs.
  • Symptoms: lethargy, fatigue, easy bruising or bleeding.
  • Common pattern: reduced oxygen-carrying capacity leads to fatigue and dyspnea.

Group activity structure (blood diseases)

  • Six groups assigned to topics:
    • Group 4: Polycythemia vera (PV)
    • Group 5: Thalassemia
    • Group 6: Aplastic anemia
    • Group 1: Sickle cell anemia
    • Group 2: Iron deficiency anemia
    • Group 3: Pernicious anemia
  • Task: look up the questions for your topic and then each group answers; all topics may be fair game for exams.
  • After group presentations, instructor will summarize key points for emphasis.
  • Reminder: stay in your groups during this activity; there will be another similar activity later.
  • The instructor will emphasize the exam content and may provide pointers on what to study.

Group 1: Sickle cell anemia

  • RBCs become crescent-shaped (sickle) instead of round.
  • Sickle-shaped cells can become stuck in blood vessels, causing swelling and severe pain.
  • Demographic focus: pain management and oxygen therapy.
  • No cure for sickle cell anemia.
  • Treatments mentioned: oral iron supplements (and iron therapy if deficient); IV iron or blood transfusions may be used in some contexts.

Group 2: Iron deficiency anemia

  • Deficiency of healthy RBCs due to insufficient iron.
  • Symptoms: weakness, shortness of breath (SOB), fatigue; possible increased bleeding and easy bruising.
  • Diagnosis: primarily via labs—hemoglobin (Hb) and hematocrit (Hct).
  • Treatments:
    • Iron tablets or iron administered intravenously (IV) when needed.
    • Nursing role: monitor labs and signs/symptoms; intervene that is necessary.

Group 3: Pernicious anemia

  • Problem: impaired absorption of vitamin B12 leading to decreased RBC production.
  • Diagnosis and management:
    • Often requires gastric biopsy or bone marrow assessment for evaluation.
    • Treatment: initially vitamin B12 injections, then possible oral supplementation.
  • Prognosis and nursing implications:
    • No cure; management relies on B12 replacement and extensive patient education.
  • Nursing role: educate about signs/symptoms, when to seek help, and how to take B12; administer B12 as prescribed.

Group 4: Polycythemia vera (PV)

  • PV = chronic myeloproliferative neoplasm characterized by overproduction of red blood cells (bone marrow overactivity).
  • Common mutation: JAK2 gene alteration (JAK2 mutation).
  • Presentation: fatigue, night sweats, weight loss.
  • Diagnostic steps: complete blood count (CBC), genetic testing for JAK2 mutation, bone marrow biopsy.
  • Treatments: low-dose aspirin, phlebotomy (to reduce RBC mass), JAK2 inhibitors.
  • Implications for nurses: monitor vitals regularly, manage phlebotomy care, and educate the patient; lifelong monitoring and prophylaxis may be required due to thrombosis risk.
  • Additional note: PV is a neoplasm of the bone marrow leading to excessive RBC production.

Group 5: Thalassemia

  • Thalassemia = decreased hemoglobin (Hb) production.
  • Presentation: pale or yellowish skin, shortness of breath, dizziness, irregular or fast heartbeat, abdominal swelling, dark urine.
  • Diagnosis: blood work, especially complete blood count (CBC).
  • Treatment: mild forms may not require treatment; severe forms may require blood transfusions or stem cell transplants.
  • Nursing implications: manage iron overload, transfusion management, pain management; education for families and patient.
  • Inheritance: thalassemias are inherited conditions; decreased Hb results in reduced oxygen delivery.
  • Other notes: anemia-related symptoms include fatigue; potential for neutropenia (low WBCs) and thrombocytopenia (low platelets) in some cases; monitor vitals and symptoms accordingly.
  • Severe form management may involve stem cell transplant and ongoing supportive care (transfusions, medications).

Group 6: Aplastic anemia

  • Aplastic anemia = body stops making new blood cells, leading to pancytopenia (involves RBCs, WBCs, and platelets).
  • Symptoms: signs of anemia, risk of infections, increased bleeding tendency.
  • Diagnostic focus: labs and bone marrow evaluation; rule out other causes.
  • Treatment/management: stem cell transplantation to rebuild bone marrow; supportive care including transfusions and infection prevention.
  • Nursing implications: monitor for signs of infection, bleeding, and fatigue; coordinate with healthcare team for comprehensive care.

Platelets and coagulation: key concepts

  • Platelets are essential for coagulation and stopping bleeding.
  • Normal platelet function supports hemostasis after injury; without platelets, even minor injuries can lead to ongoing bleeding.
  • Thrombocytosis = increased platelets; higher risk of thrombotic events (clots).
    • Interventions: mobilize patient (ambulation), ensure adequate hydration, monitor vitals.
  • Thrombocytopenia = reduced platelets; higher risk of bleeding.
    • Precautions: avoid bleeding triggers; use soft-bristled toothbrush; avoid invasive procedures unless necessary.

Diseases caused by abnormal platelets (three disorders)

  • Grouping instruction: groups 1&2 cover Hemophilia; groups 3&4 cover Von Willebrand disease; groups 5&6 cover DIC.
  • All three are on the exam; for the quiz, focus is on Von Willebrand disease as the specific topic highlighted in the session.

Hemophilia

  • Genetic disorder; most commonly X-linked.
  • Types:
    • Type A: Factor VIII deficiency.
    • Type B: Factor IX deficiency.
  • Primary goal of treatment: replace the deficient clotting factor.
  • Additional note: Vitamin K can be given to support clotting factor production (traditional teaching; check clinical context).

Von Willebrand disease

  • Inherited bleeding disorder affecting the blood’s ability to clot properly.
  • Defect or deficiency in von Willebrand factor (VWF) antigen affects platelet adhesion and aggregation.
  • Common symptoms: mucous membrane bleeding (e.g., nosebleeds), heavy menstrual bleeding, easy bruising.
  • Diagnosis: clinical evaluation, family history, lab tests including VWF antigen testing.
  • Treatments: hormone therapy, splenectomy in some cases, and blood transfusions as needed.
  • Nursing implications: anticipatory guidance, close patient assessment for bleeding, symptom recognition, and patient education.

Disseminated intravascular coagulation (DIC)

  • DIC = widespread activation of clotting within the vascular system, followed by consumption of clotting factors and bleeding.
  • Common triggers: sepsis (a bloodstream infection) is a frequent cause.
  • Symptoms: widespread bruising, organ failure, pain, swelling, fever, low blood pressure, seizures; bleeding from IV sites, eyes, ears, etc.
  • Diagnostics: CBC, CT scans, biopsies, and other coagulation studies.
  • Treatment: transfusions to replace lost clotting factors and blood components; in mild cases, anticoagulation with heparin may be used.
  • Nursing implications: administer clotting factors as needed, anticoagulants when indicated, bed rest, and activity restrictions; monitor for signs of bleeding and organ dysfunction.

Quick review: directions from the instructor on study content

  • The session emphasized that the exam will include content on anemia types, platelet disorders, and DIC/Von Willebrand disease, with particular focus on common clinical features, diagnostic approaches, and management strategies.
  • The instructor highlighted that the upcoming quiz will not include a separate blood question, directing focus toward the core disease mechanisms and nursing implications.
  • A few biology review questions were posed during class (e.g., hypertrophy vs atrophy, cell nucleus as regulator, cell membrane basics, dominant vs recessive gene expression, benign vs malignant tumors, Fragile X syndrome, trisomy 21, and the fight-or-flight response).
  • Fight-or-flight discussion: sympathetic activation increases heart rate, blood pressure, respiration, temperature, and blood glucose; decreases need to urinate and hunger signals; parasympathetic dominates rest-digest functions.
  • Key terms for biology review included: hypertrophy, atrophy, nucleus, mitochondria (the traditional “powerhouse” of the cell), cell membrane, gene expression, and tumor biology.

Miscellaneous exam preparation notes

  • Focus areas for the exam: anemias (iron deficiency, pernicious, thalassemia, sickle cell, aplastic anemia), polycythemia vera, and platelet-related disorders (hemophilia, von Willebrand disease, DIC).
  • Foundational concepts to review: erythropoiesis and its regulation, the meaning of Hb/Hct, RBC oxygen transport, and clinical implications of abnormal RBCs and platelets.
  • Remember to review the role of JAK2 in PV and the therapeutic approaches (phlebotomy, aspirin, JAK2 inhibitors).
  • The instructor encouraged using tutoring resources (Katie Sykes) for targeted review of quiz content and recommended joining Zoom sessions if needed.

Quick conceptual recap (mini flashcards)

  • What is hypertrophy? → The cell or tissue increases in size in response to stimuli.
  • What is atrophy? → Reduction in cell/Tissue size due to disuse or reduced function.
  • What is the powerhouse of the cell? → Common teaching says mitochondria; the instructor suggested thinking of cellular activity control by the nucleus in class.
  • What dictates the activities of the cell? → The nucleus (as per the class discussion).
  • What is the difference between a benign and a malignant tumor? → Malignant tumors invade and spread (cancerous); benign tumors do not invade surrounding tissue.
  • Fragile X syndrome relates to a genetic mutation on the X chromosome; trisomy 21 results in Down syndrome.
  • In the fight-or-flight response, which system dominates? → Sympathetic nervous system; parasympathetic dominates rest/defense/restoration.

Exam readiness tips

  • Prioritize understanding of pathophysiology, diagnostic criteria, and nursing implications for each listed condition.
  • Review group notes and instructor-provided slides; focus on how to recognize, diagnose, and manage each condition.
  • Use tutoring opportunities to clarify any uncertainties about quiz topics and potential exam questions.
  • Be prepared to discuss how labs (Hb, Hct, CBC, VWF antigen) inform diagnosis and treatment choices.