# Stage 2 — Analyze cues. Complete each blank to link the time-sensitive ECG findings to the next diagnostic and reperfusion decisions.

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> subject: System-Specific Assessments  
> category: ROR

## Question

Stage 2 — Analyze cues. Complete each blank to link the time-sensitive ECG findings to the next diagnostic and reperfusion decisions.

The first 12-lead ECG should be obtained and interpreted within ::선택::51030 minutes of arrival. ST elevation in leads II, III, and aVF localizes the injury pattern to the ::선택::inferioranteriorlateral wall. A ::선택::right-sidedsignal-averagedambulatory ECG should be obtained promptly to assess possible right ventricular involvement. When symptoms and the ECG establish STEMI, catheterization-laboratory activation should proceed without waiting for ::선택::troponin resultsa chest radiographa repeat CBC.

## Explanation

Four linked decisions
Obtain and interpret the first 12-lead ECG within 10 minutes. ST elevation in II, III, and aVF identifies an inferior STEMI pattern. Obtain right-sided leads to assess right ventricular involvement, and activate the primary-PCI pathway without waiting for troponin results.

## In-depth explanation

Step 1 — Read the ECG in context
Persistent ischemic chest pain plus ST elevation in contiguous inferior leads supports STEMI. Reciprocal depression in I and aVL strengthens the territorial pattern but is not required before action.

Step 2 — Look for right ventricular involvement
An inferior STEMI warrants prompt right-sided leads, especially V4R, because right ventricular involvement changes hemodynamic and medication decisions.

Step 3 — Protect reperfusion time
Troponin supports myocardial injury but must not delay catheterization-laboratory activation when the symptoms and ECG already establish STEMI.

NCLEX rule
In a diagnostic sequence, identify the result that triggers immediate action and distinguish parallel confirmation from a prerequisite.

## Clinical scenario

Scenario (Stage 2 — Analyze cues)
The ECG obtained 7 minutes after arrival shows ST elevation in II, III, and aVF with reciprocal depression in I and aVL.

Clinical judgment target
Localize the STEMI, assess right ventricular involvement, and avoid waiting for biomarkers before reperfusion activation.

## Key concepts

- **Inferior STEMI** — ST elevation in leads II, III, and aVF, commonly caused by right coronary or left circumflex artery occlusion.
- **Right-sided ECG** — Additional leads such as V4R used to detect right ventricular involvement in an inferior STEMI.
- **Parallel testing** — Laboratory confirmation and preparation that proceed while, rather than before, the time-critical reperfusion pathway is activated.

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