Rheumatologic Disease

Approach to the Patient With Rheumatologic Disease

  • Differentiation of Pain Types
    • Inflammatory vs Noninflammatory signs and symptoms are central to evaluating musculoskeletal pain.
    • Inflammatory Conditions: Autoimmune diseases (e.g., rheumatoid arthritis) generally present with inflammation.
    • Noninflammatory Conditions: Mechanical or degenerative disorders, typically lack signs of inflammation, usually only pain.
    • Cardinal Signs of Inflammation: Pain, erythema, swelling, warmth. Noninflammatory conditions usually lack these signs.
    • Patients can experience both types of pain simultaneously.

Musculoskeletal Examination

  • Importance of History and Physical Examination
    • A thorough history and musculoskeletal examination are essential for differentiating inflammatory vs noninflammatory symptoms to avoid unnecessary testing.
    • Types of Pain:
    • Articular: Pain in joints
    • Periarticular: Pain in surrounding tissues
    • Referred Pain: Pain perceived in a different area than the source.
  • Range of Motion Assessment:
    • Passive range of motion pain suggests an articular condition.
    • Active range of motion pain indicates a periarticular condition.

Types of Arthritis

1. Monoarthritis
  • Introduction: Involves a single joint classified as acute or chronic.
  • Acute Monoarthritis:
    • Can be noninflammatory or inflammatory (e.g., crystal-induced, infectious).
    • Evaluation guided by clinical presentation.
    • Joint Aspiration: Key diagnostic method for identifying the cause.
  • Chronic Monoarthritis:
    • (≥26 weeks) possible causes include chronic infections (e.g., mycobacterial), or autoimmune diseases.
    • Synovial fluid analysis aids in determining inflammation.
2. Oligoarthritis
  • Definition: Involves 2 to 4 joints, often asymmetrical.
  • Acute Oligoarthritis Causes: Gonorrhea or rheumatic fever.
  • Chronic Oligoarthritis: Linked to autoimmune conditions (e.g., Ankylosing Spondylitis).
3. Polyarthritis
  • Definition: Involves 5 or more joints, often small joints of the hands/feet.
  • Acute Causes: Viral infections (e.g., parvovirus B19, HIV).
  • Chronic Causes: Rheumatoid arthritis, lupus, or psoriatic arthritis.

Extra-Articular Manifestations of Rheumatologic Disease

  • Constitutional Symptoms:
    • Fever and stiffness are common in many rheumatologic conditions; significant fatigue is prominent in fibromyalgia.
  • Skin Involvement:
    • Common; may not be noticed by patients.
  • Eye Participation:
    • Patterns of involvement can help differentiate diagnoses; may lead to vision loss if untreated.
  • Internal Organ Involvement: Rheumatological diseases may affect internal organs, leading to complications.

Laboratory Studies

  • Diagnostic Utility: Identifies disease presence, extent, and monitors therapy response.
  • Erythrocyte Sedimentation Rate (ESR):
    • Measures erythrocyte sedimentation in mm per hour; affected by inflammation.
    • Higher in women and adjusts according to age.
  • C-Reactive Protein (CRP):
    • More rapidly responds to inflammation than ESR; higher levels indicate active disease.
  • Autoantibody Tests: Rheumatologic diseases show variable autoantibody presence (e.g., rheumatoid factor).
    • Can aid in diagnosing specific conditions but lack specificity.

Imaging Studies

  • Radiography:
    • Often the first imaging test; helps visualize bone and joint changes.
  • CT & MRI:
    • MRI better detects soft tissue changes; CT is superior for bony changes.
  • Ultrasonography: Growing in use; helps assess soft tissue and guide interventions.

Treatment Overview

  • Principles of Therapeutics:
    • Focus on both pharmacologic and non-pharmacologic approaches.
  • Anti-inflammatory Agents:
    • Glucocorticoids, NSAIDs effective for managing inflammation and pain.
  • Disease-Modifying Antirheumatic Drugs (DMARDs): Nonbiologic and biologic agents play crucial roles.
  • Addressing Comorbidities: Important in treatment plans considering mental health and other risks.