A 52-year-old woman with a history of smoking and diabetes mellitus presents with 2 episodes of severe substernal chest pain at rest over the past 24 hours. Each episode lasted 15 minutes and resolved with sublingual nitroglycerin. Her current ECG shows T-wave inversion in leads V2–V4. Troponin I is 0.08 ng/mL (upper limit of normal: 0.04 ng/mL). She is hemodynamically stable with no signs of heart failure. What is the most appropriate immediate next step?

Explanation

## Clinical Context This patient presents with **unstable angina progressing to NSTEMI** (troponin elevation with ischemic symptoms and ECG changes). She has multiple high-risk features: - **Recurrent ischemic episodes** at rest (2 episodes in 24 hours) - **Elevated troponin** (0.08 ng/mL, above upper limit of normal) - **Dynamic ECG changes** (T-wave inversion in anterior leads) - **High-risk clinical profile** (age 52, smoking, diabetes) ## Key Point: **Troponin elevation, even mild, combined with ischemic symptoms and ECG changes = NSTEMI. This mandates dual antiplatelet therapy, anticoagulation, and urgent coronary angiography.** ## High-Yield: **NSTEMI vs. Unstable Angina distinction:** | Feature | Unstable Angina | NSTEMI | |---------|-----------------|--------| | **Troponin** | Negative (serial) | Elevated | | **ECG** | May show ST depression / T-wave inversion | ST depression / T-wave inversion | | **Management** | DAPT + anticoagulation + angiography (24–72 h) | DAPT + anticoagulation + angiography (12–24 h) | | **Prognosis** | Lower mortality | Higher mortality | This patient has **troponin elevation**, confirming **NSTEMI**, not unstable angina. ## Triple Therapy in NSTEMI ```mermaid flowchart TD A[NSTEMI diagnosis: troponin elevated + ischemic symptoms]:::outcome --> B[Dual Antiplatelet Therapy]:::action B --> C[Aspirin 325 mg loading]:::action B --> D[Clopidogrel 600 mg loading]:::action A --> E[Anticoagulation]:::action E --> F[LMWH or UFH]:::action A --> G[Beta-blocker + ACE inhibitor]:::action A --> H[High-intensity statin]:::action C --> I[Urgent coronary angiography within 24 hours]:::action D --> I F --> I ``` ## Clinical Pearl: **Recurrent ischemic episodes at rest (Braunwald Class III unstable angina) are a hallmark of high-risk ACS and require urgent revascularization.** The combination of recurrent symptoms, troponin elevation, and ECG changes makes this patient a candidate for early invasive strategy. ## Rationale for Correct Answer 1. **Aspirin 325 mg** + **Clopidogrel 600 mg loading**: standard DAPT for NSTEMI 2. **Low-molecular-weight heparin (LMWH)** or **unfractionated heparin (UFH)**: mandatory anticoagulation in NSTEMI 3. **Coronary angiography within 24 hours**: indicated by troponin elevation and high-risk features; early invasive strategy improves outcomes in NSTEMI This is the guideline-recommended approach per ESC 2015 and current Indian cardiology practice.