EKG

Question 1

Which leads show views of the septal portion of the heart? 2

What artery specifically? 1

Answer 1

V1-V2 (LAD)

Question 2

Which leads show views of the anterior portion of the heart? 2
What artery specifically? 1

Answer 2

V3-V4 (LAD)

Question 3

Which leads show views of the lateral portion of the heart? 4
What arteries specifically? 2

Answer 3

Lateral: V5–V6 (LAD, CFX)

Lateral: I and aVL (LAD, CFX)

Question 4

Which leads show views of the inferior portion of the heart? 3
What arteries specifically? 1

Answer 4

Inferior: II, III, and aVF (RCA)

Question 5

What is the J point?

Answer 5

point of transition from S wave to T wave (often shows ST depression)

Landmark for measuring QRS duration. The J point is at the end of ventricular depolarization and at times can be hard to find.
QRS waves are vertical while the ST segment is usually horizontal. Because the J point is the intersection of these waves, you will be looking for the change from vertical to horizontal.

Question 6

Elevation or depression of the ST segment is a hallmark sign of what?
3

What should the duration be?

Answer 6

1. ischemia,
2. CAD or
3. impending MI (STEMI)

Duration: 0.08 to 0.12 sec

Question 7

How long should the QT interval be?

What does it represent?

Answer 7

Normally 0.34 seconds to 0.43 second

Represents the total duration of electrical activity of the ventricles.

Question 8

Abnormalities in the T wave can indicate what?

Answer 8

ischemia

Question 9

What does the U wave represent?

Pathologically what can they represent?
4

Answer 9

Thought to represent repolarization of the purkinje fibers

Prominent U waves are most often seen in

1. hypokalemia, but may be present in
2. hypercalcemia,
3. thyrotoxicosis, or
4. exposure to digitalis or epinephrine