A 58-year-old man with hypertension and dyslipidemia presents to the emergency department with chest pain of 3 hours duration. The pain is substernal, radiating to the left arm, and associated with diaphoresis. His initial ECG shows ST depression in leads II, III, aVF, and V3–V4 with T-wave inversion. Troponin I at presentation is negative. Vital signs are stable. What is the most appropriate immediate next step in management?

Question

Accepted Answer

B. Administer aspirin 325 mg, clopidogrel 600 mg loading dose, unfractionated heparin, and arrange coronary angiography within 24 hours. ## Clinical Context
This patient presents with acute coronary syndrome (ACS) with high-risk features: typical ischemic chest pain, dynamic ECG changes (ST depression and T-wave inversion in multiple territories), and hemodynamic stability. Although troponin is negative at presentation, this does NOT exclude ACS — troponin can be negative in the first 3 hours of symptom onset.

## Key Point:
**Early dual antiplatelet therapy (DAPT) and anticoagulation are indicated in NSTEMI/unstable angina regardless of initial troponin negativity.** The presence of ischemic ECG changes and typical symptoms is sufficient to initiate treatment.

## High-Yield:
**Timing of coronary angiography in NSTEMI:**
- **High-risk features** (recurrent ischemia, hemodynamic instability, ECG changes, elevated troponin, heart failure): angiography within **24 hours** (preferably within 12 hours)
- **Intermediate-risk features**: angiography within **24–72 hours**
- **Low-risk features**: may defer or perform stress testing

This patient has high-risk features (ST depression in multiple territories, ongoing symptoms), warranting urgent angiography within 24 hours.

## Management Algorithm

```mermaid
flowchart TD
  A[Chest pain + ECG changes ± troponin]:::outcome --> B{High-risk features?}:::decision
  B -->|Yes: ST depression, T-wave inversion, recurrent pain| C[Aspirin + Clopidogrel loading]:::action
  C --> D[Unfractionated heparin or LMWH]:::action
  D --> E[Angiography within 24 hours]:::action
  B -->|No: stable, low-risk| F[Observation + serial troponin]:::action
  F --> G[Stress test or delayed angiography]:::action
  E --> H[PCI if culprit lesion identified]:::action
```

## Clinical Pearl:
**Troponin negativity in the first 3 hours does not rule out ACS.** Serial troponin measurement (at 3 and 6 hours) is standard, but treatment should not be delayed pending results if clinical and ECG findings are suggestive.

## Rationale for Correct Answer
- **Aspirin 325 mg** + **Clopidogrel 600 mg loading dose**: dual antiplatelet therapy is the foundation of NSTEMI management
- **Unfractionated heparin**: anticoagulation reduces thrombotic events
- **Angiography within 24 hours**: indicated by high-risk ECG changes and typical ischemic symptoms

This approach follows the 2014 ACS guidelines and is the standard of care in Indian cardiology practice.

Answer

A. Observe for 6 hours with serial troponin measurements and ECGs; perform angiography only if troponin becomes positive

Answer

C. Administer aspirin and clopidogrel, start atorvastatin, and discharge home with outpatient cardiology follow-up

Answer

D. Perform stress testing to risk-stratify before considering any antiplatelet or anticoagulant therapy

Explanation

Clinical Context

Key Point:

High-Yield:

Management Algorithm

Clinical Pearl:

Rationale for Correct Answer

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