This video, "Rheumatology Part 1," offers a comprehensive overview of several key rheumatological conditions, including Fibromyalgia, Gout, Pseudogout, Juvenile Idiopathic Arthritis (JIA), Osteoporosis, Polyarteritis Nodosa (PAN), and Polymyalgia Rheumatica (PMR). The speaker delves into the clinical manifestations, risk factors, diagnostic criteria (including specific lab findings and imaging characteristics), and treatment strategies for each disease. Particular emphasis is placed on differentiating features, high-yield information for exams, and common mnemonics to aid memorization. The presentation highlights the importance of patient comorbidities in treatment selection and distinguishing between similar conditions, such as gout and pseudogout based on crystal characteristics, and PAN from other vasculitides by its unique lack of lung involvement and ANCA negativity.
Rheumatology Part 1: Key Conditions, Diagnosis, and Treatment
0:00 Introduction: This is Part 1 of two videos on rheumatology, covering several topics for a dense subject.
Definition: Chronic disorder of widespread musculoskeletal pain accompanied by somatic symptoms (fatigue, cognitive, psychiatric). Etiology and pathophysiology are unknown.
Demographics: Most common in women aged 20-55.
Diagnosis: Primarily clinical. Historically, 11 of 18 tender points were used (1990 criteria), but newer 2010 ACR criteria do not recommend palpating specific tender points in practice, though it may still appear on exams. Lab tests (CBC, ESR, C-reactive protein) are normal and are primarily used to rule out other inflammatory diseases. Diagnosis suspected with 3+ months of widespread multi-site pain without identifiable cause.
Treatment: Conservative (patient education, cognitive behavioral therapy, low-impact aerobic exercise) is first line. Pharmacologic treatment includes tricyclic antidepressants (TCAs), particularly amitriptyline.
Definition: Characterized by hyperuricemia and deposition of monosodium urate crystals, leading to acute inflammatory arthritis. Hyperuricemia is necessary but most hyperuricemic individuals don't develop gout.
Risk Factors: Male sex (estrogen is uricosuric), advancing age.
Modifiable Risk Factors: Diet (purine-rich foods like seafood, red meat, organ meat, alcohol). Medications: Pyrazinamide, Loop diuretics (furosemide), low-dose Aspirin (<325mg), Thiazides (hydrochlorothiazide), Ethambutol (mnemonic: PLATES).
Clinical Manifestations: Severe pain, redness, warmth, swelling, often monoarticular (80% of initial flares). Most common in lower extremities, especially the first metatarsophalangeal (MTP) joint (podagra).
Diagnosis: Arthrocentesis (best and definitive test, 85% sensitive, 100% specific) reveals negatively birefringent needle-shaped crystals. X-ray may show "overhanging edges" or "punched out appearance" in long-standing gout. Serum uric acid levels are not reliable during an acute attack (often normal/low) and should be measured 2+ weeks after the flare resolves.
Treatment (Acute Attack): NSAIDs (naproxen, indomethacin) – cautious use in patients with poor renal function (GFR < 60), active ulcers, or certain cardiovascular diseases. Glucocorticoids (oral or intra-articular) – suitable for patients with renal insufficiency, but caution with poorly controlled diabetics or active infections. Colchicine – effective for acute flares and the only medication used for both acute and chronic management; common adverse drug reaction is diarrhea.
Treatment (Chronic): Allopurinol (xanthine oxidase inhibitor, first-line prophylactic agent) – inhibits uric acid production; adverse drug reaction: Stevens-Johnson Syndrome (mnemonic: APPLE PCS). Febuxostat is another xanthine oxidase inhibitor but less used due to increased cardiovascular risk. Probenecid (uricosuric medication) – promotes renal uric acid clearance; avoid in patients with a history of nephrolithiasis. Pegloticase is reserved for severe, refractory cases.
Definition: Deposition of calcium pyrophosphate dihydrate (CPPD) crystals in joints and soft tissues.
Most Common Joint: Knee (mnemonic: "sumo gout" - sumo wrestlers with hands on knees).
Clinical Manifestations: Acute attacks similar to gout (intense pain, redness, warmth, swelling) but are much less common, with the majority of patients being asymptomatic.
Diagnosis: Arthrocentesis reveals positively birefringent rhomboid-shaped crystals (mnemonic: Pseudo has a 'P', Positive has a 'P'). X-rays show punctate or linear radiodensities in cartilage (chondrocalcinosis).
Treatment: Similar to acute gout, but with a greater emphasis on intra-articular steroid injections for one to two affected joints.
Definition: Chronic pediatric inflammatory arthritis with onset before 16 years of age and arthritis present for at least six weeks. It's a diagnosis of exclusion.
Key Age: Peak incidence is 1-5 years, but the cutoff is 16 years; onset after 16 is Adult-Onset Still's Disease.
Clinical Manifestations: Fever (persistent for at least two weeks, follows a diurnal/quotidian pattern – daily spikes and returns to normal), Arthritis (at least six weeks; polyarticular if ≥5 joints, oligoarticular if <5 joints), Rash (evanescent macular salmon-pink rash), Uveitis (seen in oligoarticular and polyarticular subtypes, common in ANA-positive patients).
Treatment: NSAIDs for mild to moderate symptoms. Biologics (e.g., Actemra) or glucocorticoids for severe cases.
Definition: Metabolic bone disease characterized by bone tissue deterioration, low bone mass, and increased skeletal fragility due to osteoclast activity exceeding osteoblast activity.
Clinical Manifestations: Often called the "silent disease" because it has no symptoms until a fracture occurs.
Fractures: Most common is vertebral compression fractures (often painless, may present as height loss or kyphosis). Also hip fractures and distal radius (Colles') fractures.
Diagnosis:
DEXA Scan (Gold Standard): Measures bone density using T-scores.
Osteoporosis: T-score ≤ -2.5 (mnemonic: "poor is less than 2.4").
Osteopenia (low bone mass): T-score between -1.0 and -2.5 (mnemonic: "pen is less than 1.0").
Fragility Fracture: A fracture occurring from minor trauma (e.g., fall from standing height) also diagnoses osteoporosis, independent of T-score.
Treatment:
Lifestyle: Adequate Vitamin D and calcium, weight-bearing exercise, smoking cessation, fall prevention.
Pharmacologic:
Bisphosphonates (alendronate, risedronate) are first-line. They inhibit osteoclastic bone resorption (anti-resorptive agents). Mnemonic: "phone in your drones to build strong bones."
Bisphosphonate ADRs: Pill-induced esophagitis (patients must remain upright for at least 30-60 minutes and take with 6-8 ounces of water; contraindication for those with esophageal disorders). Rare but mentioned: osteonecrosis of the jaw and atypical femur fractures.
Anabolic Agents (teriparatide, abaloparatide, romosuzumab) are for severe osteoporosis (T-score ≤ -3.5) and rebuild new bone.
Denosumab: Another anti-resorptive, administered every six months, useful in patients with impaired renal function.
Raloxifene (SERM): An anti-resorptive that also reduces breast cancer risk (mnemonic: similar to tamoxifen).
Definition: Chronic inflammatory condition causing pain and stiffness in shoulders, hip girdle, and neck/torso; muscle strength is normal, and it involves joints/periarticular structures.
Demographics: Almost exclusively in adults over 50 (peak 70-80 years), women affected 2-3 times more often.
Critical Association: Strongly associated with Giant Cell Arteritis (GCA) (5-30% of PMR patients); GCA can lead to blindness if untreated. Patients should be screened for GCA symptoms (headaches, jaw claudication, transient vision loss). Mnemonic: "Paul B. Myalgia Rheumatica" (Paul B as in Paul Bunyan, the giant, linking to Giant Cell Arteritis).
Clinical Manifestations: Aching and stiffness (especially bilateral shoulder pain, 70-95% of patients) that is worst in the morning or after inactivity. Patients may have difficulty with daily activities like rising from a chair or raising arms.
Laboratory Findings: Elevated ESR and C-reactive protein (acute phase reactants) are almost universally present. Other labs (rheumatoid factor, anti-CCP, creatine kinase) are normal.
Treatment & Diagnosis Confirmation: Low-dose glucocorticoids (15-25 mg daily) are the treatment. A rapid and dramatic symptomatic relief (within days) to corticosteroids is a key diagnostic feature; lack of response strongly suggests an alternative diagnosis.
53:00 Practice Questions: The video concludes with five practice questions covering Fibromyalgia, Gout, Osteoporosis, and PMR to reinforce key concepts.