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?

Question

Accepted Answer

B. Administer aspirin, clopidogrel, and low-molecular-weight heparin; arrange coronary angiography within 24 hours. ## 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.

Answer

A. Administer aspirin and a beta-blocker; perform stress testing to assess for inducible ischemia

Answer

C. Administer aspirin and clopidogrel only; defer anticoagulation until troponin is confirmed to be elevated on repeat testing

Answer

D. Administer aspirin and clopidogrel; start high-intensity statin therapy and observe for 48 hours before considering angiography

Explanation

Clinical Context

Key Point:

High-Yield:

Triple Therapy in NSTEMI

Clinical Pearl:

Rationale for Correct Answer

Practice similar questions

Join our NEET PG community

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