Cardio - ECG

Question 1

Electrode limb placement

Answer 1

-ve electrode right arm

+ve electrode left leg

Question 2

Which leads look the same on an ECG trace?

Answer 2

Leads I, II, III, avL, avF

Question 3

Which lead on an ECG trace is upside down?

Answer 3

avR

Question 4

What part of the heart is leads II, III, avF looking at?

Answer 4

Inferior wall of the heart

Question 5

What part of the heart is leads I, avL looking at?

Answer 5

Looks at high lateral wall of the LV

Question 6

What part of the heart is lead avR looking at?

Answer 6

Looks at RV and basal septum

Question 7

Unipolar limb leads - what does leads V1-3 tell you about?

Answer 7

It tells you about RV, and you get a small R wave in each lead because RV wall is thinner than LV

V4-6 has much bigger R waves

Question 8

Which unipolar limb leads have a bigger S wave?

Answer 8

V1-3 has a bigger S wave than V4-6

Question 9

In the unipolar limb leads what is the R wave to S wave ratio?

Answer 9

R to S ratio:

As you progress from V1 to V6, R waves get BIGGER

As you progress from V1 to V6, S waves get SMALLER

Question 10

What leads tell you about RV?

Answer 10

V1-3 and avR

Question 11

Which leads tell you information about the basal septum?

Answer 11

V2, V3, avR

Question 12

Which leads tell you about the anterior wall of the heart?

Answer 12

V2-4

Question 13

Which leads tell you about lateral wall of LV?

Answer 13

V5, V6, lead 1, and avL