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12 Lead ECG – ISAL Practice Worksheet

ST Segment Identification

Find the ST segment and color it in to the isoelectric line. Is it elevated or depressed?

1 2 3 4 5

6 7 8 9

10 11 12

13 14 15 16

2

Inferior

What are the Reciprocal Leads:

3

Septal

4

Anterior

What are the Reciprocal Leads:

5

Lateral

What are the Reciprocal Leads:

Student References: Appropriate Lead Placement

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Reference: 12 Lead Analysis

• Is ST elevation present?

• Is there reciprocal changes?

• Is the patient on medication that can cause changes in the 12 Lead?

• Is there ST depression or T wave inversion?

• Are pathological Q waves present?

STEMI Vessel Leads Reciprocal Leads

I Inferior RCA II, III, aVF I, aVL

S Septal LAD V1, V2

A Anterior LAD V3, V4 II, III, aVF

L Lateral Circumflex V5, V6, I, aVL II, III, aVF