Lead Placement
Where is V1 placed on the chest?
4th intercostal space, right sternal border
Which leads view the anterior wall?
A: V3, V4
What does “aVR” stand for?
Augmented Voltage Right
Name one pair of contiguous leads.
V1 and V2
What does a tall peaked T-wave often indicate?
Hyperkalemia
Which lead is placed at the 5th intercostal space, midclavicular line?
V4
Which leads show inferior wall activity?
II, III, aVF
Which three leads make up Einthoven’s Triangle?
Leads I, II, and III
What are the reciprocal leads to II, III, aVF?
I and aVL
ST elevation usually means what?
Myocardial infarction
Which limb lead is considered the ground?
Right leg (RL)
What leads are used to assess the lateral wall?
I, aVL, V5, V6
What type of leads are V1–V6?
Precordial or chest leads
If there’s ST elevation in V3 and V4, where is the MI?
Anterior wall
What wave represents atrial depolarization?
P wave
Which lead is placed on the left midaxillary line?
V6
The septal wall is best viewed by which leads?
V1, V2
What plane do limb leads view?
Frontal plane
What does “reciprocal” mean on an ECG?
Opposite leads showing ST depression during an ST elevation MI
What segment should be flat and represents ventricular repolarization?
ST segment
What lead is halfway between V2 and V4
V3
Posterior MIs are typically seen how?
Reciprocal changes in V1–V3, or using posterior leads V7–V9
What plane do precordial leads view?
Horizontal plane
Which leads are reciprocal to I and aVL?
II, III, aVF
What part of the ECG is measured to assess heart rate?
R–R interval