Lead Placement
Heart Walls
Lead Names
Contiguous & Reciprocal
Mystery ECG
100

Where is V1 placed on the chest?

4th intercostal space, right sternal border

100

Which leads view the anterior wall?
 

A: V3, V4

100

What does “aVR” stand for?

Augmented Voltage Right


100

Name one pair of contiguous leads.

V1 and V2

100

What does a tall peaked T-wave often indicate?

Hyperkalemia

200

Which lead is placed at the 5th intercostal space, midclavicular line?

V4

200

Which leads show inferior wall activity?

 II, III, aVF

200

Which three leads make up Einthoven’s Triangle?

Leads I, II, and III

200

What are the reciprocal leads to II, III, aVF?

I and aVL

200

ST elevation usually means what?

Myocardial infarction

300

Which limb lead is considered the ground?

Right leg (RL)

300

What leads are used to assess the lateral wall?

I, aVL, V5, V6 


300

What type of leads are V1–V6?

Precordial or chest leads

300

If there’s ST elevation in V3 and V4, where is the MI?

Anterior wall

300

What wave represents atrial depolarization?

P wave

400

Which lead is placed on the left midaxillary line?

V6

400

The septal wall is best viewed by which leads?

 V1, V2

400

What plane do limb leads view?

Frontal plane

400

What does “reciprocal” mean on an ECG?

Opposite leads showing ST depression during an ST elevation MI

400

What segment should be flat and represents ventricular repolarization?

ST segment

500

What lead is halfway between V2 and V4

  •  V3

500

Posterior MIs are typically seen how?

Reciprocal changes in V1–V3, or using posterior leads V7–V9

500

What plane do precordial leads view?

Horizontal plane

500

Which leads are reciprocal to I and aVL?

II, III, aVF

500

What part of the ECG is measured to assess heart rate?

R–R interval