A 62-year-old Indian woman presents with a 2-month history of severe headache, jaw claudication, and visual blurring in the left eye. On examination, she is afebrile, has a prominent left temporal artery that is tender and non-pulsatile, and visual acuity is 6/36 in the left eye. ESR is 78 mm/hr, CRP is 12 mg/dL, and hemoglobin is 9.8 g/dL. Temporal artery biopsy shows granulomatous inflammation with giant cells. What is the most appropriate immediate management?

Explanation

## Diagnosis: Giant Cell Arteritis (Temporal Arteritis) ### Clinical Presentation This patient has classic features of giant cell arteritis (GCA): **Key Point:** The diagnostic triad is: 1. **Age >50 years** (almost universal) 2. **Headache** (temporal, occipital, or frontal) 3. **Elevated inflammatory markers** (ESR >50 mm/hr in 90% of cases) ### Pathognomonic Features - **Jaw claudication** — pathognomonic for GCA; occurs in ~50% of patients - **Visual symptoms** — amaurosis fugax or sudden vision loss from arteritic anterior ischemic optic neuropathy (AAION) - **Tender, non-pulsatile temporal artery** — suggests arterial occlusion - **Temporal artery biopsy showing granulomatous inflammation with giant cells** — gold standard for diagnosis ### Why Immediate High-Dose Corticosteroids? **Warning:** This is an **ophthalmologic emergency**. Vision loss in GCA is due to arterial occlusion and is **irreversible**. Once vision is lost, it cannot be recovered. **High-Yield:** The presence of **visual symptoms (amaurosis fugax or vision loss)** mandates **immediate high-dose IV methylprednisolone** (1 g daily × 3 days) followed by high-dose oral prednisolone (1 mg/kg/day, typically 40–60 mg/day). ### Treatment Algorithm ```mermaid flowchart TD A["Suspected GCA with visual symptoms"]:::outcome --> B{"Biopsy already done?"}:::decision B -->|Yes| C["Start IV methylprednisolone 1g daily × 3 days"]:::urgent B -->|No| D["Biopsy within 24-48 hrs if possible"]:::action D --> C C --> E["Transition to oral prednisolone 40-60 mg/day"]:::action E --> F["Slow taper over 12-24 months"]:::action F --> G["Add steroid-sparing agent if prolonged course"]:::action G --> H["Regular ophthalmology review"]:::action ``` ### Rationale for Immediate Treatment **Clinical Pearl:** Do NOT wait for biopsy results if clinical suspicion is high and vision is threatened. Biopsy can be done within 24–48 hours after starting corticosteroids; temporal artery changes persist for weeks even after treatment initiation. **Key Point:** The risk of **permanent blindness** (20–50% if untreated) far outweighs the risk of starting corticosteroids empirically in a patient with: - Age >50 - Headache + jaw claudication - Elevated ESR/CRP - Visual symptoms - Positive temporal artery biopsy ### Long-Term Management 1. **Slow corticosteroid taper** over 12–24 months (rapid taper increases relapse risk) 2. **Steroid-sparing agents** (methotrexate, tocilizumab) for patients with prolonged course or steroid intolerance 3. **Aspirin** (75–100 mg daily) for secondary prevention of vascular events (not monotherapy) 4. **PPI + calcium/vitamin D** for bone protection 5. **Regular ESR/CRP monitoring** and ophthalmology follow-up ### Prognosis - Blindness occurs in 15–20% of untreated patients - With prompt treatment, vision loss can be prevented in >95% of cases - Relapse occurs in 40–60% of patients during taper [cite:Harrison 21e Ch 379; Robbins 10e Ch 11]