Paget Disease of Bone (Osteitis Deformans) (Study Outline) F…
Questions
The nurse is аssisting with the cаre оf а patient admitted tо the emergency department with chemical burns acrоss the chest and hands. Which of the following actions should be included in the plan of care? (Select all that apply.)
Pаget Diseаse оf Bоne (Osteitis Defоrmаns) (Study Outline) For study only—this is not medical advice or a substitute for professional care. 1. Background Definition:Chronic skeletal disorder caused by disorganized bone remodeling—excessive bone resorption followed by chaotic bone formation—resulting in enlarged, deformed, and weak bone. Pathophysiology: Overactive osteoclasts → excessive bone breakdown. Compensatory osteoblastic activity → disorganized, sclerotic new bone (mosaic pattern). Affected bone is hypervascular, structurally weak, and prone to fractures. Commonly involves pelvis, skull, spine, femur, tibia. Etiology: Unknown; likely genetic (SQSTM1 mutations) or viral (paramyxovirus) triggers. Epidemiology: Onset usually after age 50, more common in men. Higher prevalence in European descent. Often asymptomatic, discovered incidentally via elevated alkaline phosphatase (ALP). 2. History Asymptomatic in up to 80%. Symptomatic findings: Bone pain (most common symptom; dull, aching, worse at night). Skeletal deformities: Skull enlargement (“increasing hat size”), frontal bossing. Bowing of long bones (femur, tibia). Hearing loss (CN VIII compression from skull involvement). Fractures: transverse (“chalk-stick”) fractures in long bones. Warmth over affected bone (due to increased vascularity). Complications: Osteoarthritis (bone deformity near joints). High-output heart failure (rare, from increased vascularity). Osteosarcoma (rare malignant transformation). Historical Clues: Older adult with bone pain + elevated ALP + normal calcium. Hearing loss or increasing hat size = classic clue. 3. Exam Findings General: Often normal; may show deformities or tenderness. Skull: Frontal bossing, craniofacial enlargement, hearing loss. Spine: Kyphosis or spinal stenosis (nerve compression). Extremities: Bowing of legs (anterolateral tibial curvature), increased warmth. CV: In advanced disease, signs of high-output cardiac failure. 4. Making the Diagnosis Laboratory Findings: Test Result Alkaline phosphatase (ALP) ↑↑ (high bone turnover) Calcium Normal Phosphate Normal PTH Normal Urinary hydroxyproline ↑ (bone collagen breakdown) Imaging: X-ray (diagnostic hallmark): Early: osteolytic (“blade of grass” or “flame-shaped”) lesions. Mixed phase: patchy sclerosis and cortical thickening. Late: dense, enlarged bone with deformity. Skull: “cotton wool” appearance. Bone scan: Increased uptake in affected bones—maps disease extent. Diagnostic Pattern: Elevated ALP with normal calcium and phosphate + characteristic radiologic findings. Gold Standard: X-ray evidence of mixed lytic–sclerotic lesions + elevated ALP. 5. Management (Exam Concepts) (Conceptual overview only—no dosing or treatment regimens.) 1. Asymptomatic Patients: Observation if no pain or deformity and ALP stable. 2. Symptomatic or Active Disease: First-line: Bisphosphonates (e.g., alendronate, zoledronic acid) → inhibit osteoclasts. Second-line: Calcitonin (less potent, used if bisphosphonates contraindicated). Pain management: NSAIDs or acetaminophen for bone pain. Calcium and vitamin D supplementation to prevent hypocalcemia during treatment. 3. Complications Management: Orthopedic surgery: for fractures, severe deformity, or arthritis. Hearing aids for auditory loss. Monitor ALP levels for treatment response and recurrence. QUESTION A 72-year-old man presents to his primary care clinic with a complaint of increasing right hip discomfort over the past few months. He denies recent trauma. His medical history includes hypertension and type 2 diabetes. He does not take corticosteroids. He reports difficulty hearing from his right ear and occasional headaches. Physical examination reveals mild anterior bowing of the right tibia and decreased range of motion in the right hip. Laboratory studies show: Serum calcium: 9.4 mg/dL (8.6–10.2) Phosphate: 3.1 mg/dL (2.5–4.5) Alkaline phosphatase: 430 U/L (40–129) PTH: 42 pg/mL (10–65) Which of the following is the most appropriate next step in management? A) Reassurance and observationB) Oral bisphosphonate therapyC) Serum 25-hydroxyvitamin D levelD) Total body bone scintigraphy
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