Alterations in Hematologic Function

I. Anatomy, Physiology, and Pathophysiology

  • Blood clots, or thrombi, can form in both arteries and veins.
    • Venous system is more commonly affected, especially in conditions like deep vein thrombosis (DVT).
    • Arteries carry oxygen-rich blood from the heart; veins return deoxygenated blood.
  • Platelets and clotting factors in blood stop bleeding after blood vessel injury, but can lead to unwanted blood clots.
Pathophysiology
  • A thrombus forms with an imbalance between procoagulant factors (promote clotting) and anticoagulant factors (prevent clotting).
    • Causes include:
    • Endothelial injury (e.g., from trauma, surgery)
    • Stasis of blood flow due to immobility or heart failure
    • Hypercoagulability from genetic factors, medications, or pregnancy

II. Epidemiology, Etiology, and Risk Factors

  • Epidemiology
    • DVT and Pulmonary Embolism (PE) are major causes of morbidity and mortality in hospitalized patients.
  • Etiology and Risk Factors
    • Virchow’s Triad comprises three factors contributing to blood clots:
    1. Endothelial injury - Trauma/damage to blood vessels
    2. Stasis of blood flow - Immobility, heart failure, varicose veins
    3. Hypercoagulability - Pregnancy, hormonal contraceptives, genetic disorders,
      and cancers.
    • Additional factors:
    • Increased age, surgical procedures (especially orthopedic), obesity, smoking, family history, and prolonged immobility.

III. Impact on Overall Health

  1. Physiological Impact
    • DVT: Swelling, pain, redness in affected limb, risk of PE.
    • PE: Shortness of breath, chest pain, rapid heart rate, potentially fatal if untreated.
    • Complications: Post-thrombotic syndrome and chronic pulmonary hypertension.
  2. Psychosocial Impact
    • Anxiety and depression from fear of recurrent clots and disability.
    • Lifestyle limitations post-DVT/PE.
  3. Considerations for Aging Adults
    • Increased risk due to age-related circulation changes and multiple comorbidities.
    • Older adults may not exhibit typical PE symptoms, complicating diagnosis.
    • Managing anticoagulants may be more challenging due to renal or hepatic impairment.

IV. Clinical Presentation

  • Signs and Symptoms of DVT
    • Swelling in affected leg, pain/tenderness in the calf or thigh, redness/warm skin.
  • Signs and Symptoms of PE
    • Sudden shortness of breath, sharp chest pain (worsens with deep breaths), coughing blood, dizziness/fainting.
Laboratory Testing and Diagnosis
  • Ultrasound: Common for diagnosing DVT.
  • D-dimer test: Measures clotting activity; elevated in DVT/PE.
  • CT Scan Pulmonary Angiography: Preferred for diagnosing PE.
  • Ventilation-perfusion (V/Q) scan: Alternative for PE.
  • Echocardiography: Assesses heart function if PE strains the heart.

V. Role of the Nurse

  1. Environmental Factors
    • Encourage early ambulation, hydration, and use of compression devices for high-risk patients.
  2. Safety Considerations
    • Monitor for bleeding signs in patients on anticoagulants; prevent DVT/PE through timely intervention.
    • Ensure safe mobility for DVT/PE risk patients.
  3. Individual Factors
    • Consider patient history for risk factors and monitor vital signs for PE signs.
  4. Client Education
    • Emphasize medication adherence, lifestyle changes, and recognizing signs of complications.

VI. Nursing Process

  1. Assessment
    • Identify risk factors, monitor DVT/PE signs, and review lab results.
  2. Planning
    • Early intervention and patient education for DVT/PE management.
  3. Intervention
    • Administer anticoagulants and encourage mobility while monitoring complications.
  4. Evaluation
    • Assess response to therapy, symptom changes, and patient understanding.

VII. Treatments and Therapies

  • Medications:
    • Anticoagulants: Warfarin, heparin, low molecular weight heparins, and direct oral anticoagulants.
    • Thrombolytics: Used for severe cases such as massive PE.
    • NSAIDs or Acetaminophen: Pain relief for DVT.
  • Non-Pharmacologic:
    • Compression stockings and leg elevation to prevent swelling/clots.
  • Invasive Therapies:
    • Surgical thrombectomy for persistent clots; IVC filter for patients who cannot take anticoagulants.
  • Prevention Strategies:
    • Encourage mobility and the use of compression devices for high-risk individuals.

Note: The information outlined covers essential topics related to blood clots (thrombosis), including anatomy, epidemiology, clinical manifestations, nursing roles, and therapeutic interventions.