ECG Basics

Question 1

Which leads look at the left lateral surface of the heart?

Answer 1

I, aVL, V5, and V6

Question 2

What is the normal length of the QRS?

Answer 2

0.12s (3 small squares)

Question 3

Which leads look at the intraventricular septum?

Answer 3

V3 and V4

Question 3

Which artery generally supplies the inferior surface of the LV?

Answer 3

R coronary artery

Question 5

How much times does a smal square represent?

Answer 5

0.04s

Question 6

Which way does the AP travel across the wall of the heart?

Answer 6

Endo to epicardium

Question 7

Which leads look at the inferior surface of the heart?

Answer 7

II, III and aVF

Question 8

Which leads look at the RA?

Answer 8

aVR

Question 9

Which leads look at the RV?

Answer 9

V1 and V2

Question 10

What is a normal PR interval?

Answer 10

0.12 to 0.2s (3 to 5 small squares)

Question 11

What are the PR interval represent in terms of cardiac physiology?

Answer 11

The time taken for impulse to travel from the SA node, through the atrium, AV, bundle of his and into ventricular muscle

Question 12

II, III and aVF is which artery?

Answer 12

R coronary artery

Question 13

Which leads look at the anterior and lateral wall of the LV?

Answer 13

V5 and V6

Question 14

How much times does a large square represent?

Answer 14

0.2s