A 62-year-old man from Delhi presents with progressive back pain for 3 months and recent onset lower limb weakness. On examination, he has tenderness over the lumbar spine. Laboratory investigations show hemoglobin 8.2 g/dL, serum creatinine 2.8 mg/dL, serum calcium 11.5 mg/dL, and serum albumin 2.1 g/dL. Serum protein electrophoresis reveals an M-spike of 4.2 g/dL in the gamma region. Bone marrow aspiration shows 35% plasma cells. MRI spine demonstrates compression fracture at L3 with epidural extension causing cord compression. What is the most appropriate immediate management?

Explanation

## Clinical Context This patient presents with multiple myeloma complicated by **spinal cord compression** — a medical emergency requiring urgent decompression to prevent permanent neurological deficit. ### Key Diagnostic Features of Multiple Myeloma **High-Yield:** - M-spike on serum protein electrophoresis (4.2 g/dL, normal <1 g/dL) - Bone marrow plasma cells ≥30% (this patient has 35%) - CRAB criteria present: - **C**alcium elevation (11.5 mg/dL, normal <10.5) - **R**enal impairment (creatinine 2.8 mg/dL) - **A**nemia (Hb 8.2 g/dL) - **B**one lesions (compression fracture at L3) ### Why Urgent Spinal Decompression? **Clinical Pearl:** - Spinal cord compression is a **medical emergency** in myeloma. - MRI evidence of epidural extension with neurological deficit (lower limb weakness) mandates **urgent surgical decompression** within 24–48 hours. - Delay risks irreversible paraplegia; surgery can restore or stabilize function if performed promptly. - Post-operative chemotherapy (melphalan-based or novel agents) follows once the patient recovers from surgery. **Key Point:** - Radiation alone is insufficient for mechanical compression with cord signal change and neurological deficit. - Dexamethasone is adjunctive (reduces edema) but does not relieve mechanical compression. ### Management Algorithm ```mermaid flowchart TD A[Multiple Myeloma + Spinal Cord Compression]:::outcome --> B{Neurological deficit present?}:::decision B -->|Yes, acute onset| C[Urgent MRI spine]:::action C --> D{Epidural mass + cord signal change?}:::decision D -->|Yes| E[Urgent surgical decompression]:::urgent D -->|No| F[High-dose dexamethasone + RT]:::action E --> G[Post-op recovery]:::outcome G --> H[Chemotherapy initiation]:::action B -->|No neurological deficit| I[Chemotherapy + supportive care]:::action ``` ### Standard Myeloma Induction Therapy (Post-Emergency Management) | Regimen | Components | Use | | --- | --- | --- | | **VRd** | Bortezomib, lenalidomide, dexamethasone | Standard induction, transplant-eligible | | **VTd** | Bortezomib, thalidomide, dexamethasone | Alternative induction | | **Melphalan-Pred** | Melphalan, prednisolone | Older regimen, transplant-ineligible | **High-Yield:** Modern induction uses proteasome inhibitors (bortezomib) or immunomodulators (lenalidomide) + dexamethasone, not melphalan monotherapy. ## Why This Answer is Correct Urgent surgical decompression is the **standard of care** for myeloma-related spinal cord compression with neurological deficit. Chemotherapy is initiated after surgical recovery and stabilization.