ECG Basics_ leads and waveforms

Question 1

What is the degree of lead I?

Answer 1

0

Question 2

What is the degree of lead II?

Answer 2

+60

Question 3

What is the degree of lead III?

Answer 3

+120

Question 4

What is the degree of lead aVL?

Answer 4

-30

Question 5

What is the degree of lead aVR?

Answer 5

-150

Question 6

What is the degree of lead aVF?

Answer 6

+90

Question 7

Where is lead V1 placed?

Answer 7

4th intercostal space to the right of the sternum

Question 8

Where is lead V2 placed?

Answer 8

4th intercostal space to the left of the sternum

Question 9

Where is lead V4 placed?

Answer 9

5th intercostal space at the midclavicular line (below nipple)

Question 10

Where is lead V3 placed?

Answer 10

midpoint of V2 and V4. Place these leads first

Question 11

Where is lead V5 placed?

Answer 11

horizontally adjacent to V4 at anterior axillary line

Question 12

Where is lead V6 placed?

Answer 12

horizontally adjacent to V5 at midaxillary line (armpit)

Question 13

Precordial leads are considered unipolar because of their-

Answer 13

positive only charge

Question 14

Describe the duration and amplitude of a large box on an ECG strip:

Answer 14

duration: 0.20 seconds
amplitude: 0.5 mV

Question 15

`Describe the duration and amplitude of a small box on an ECG strip:

Answer 15

duration: 0.04 seconds
amplitude: 0.1 mV

Question 16

What are two ways to measure HR on a 6-second strip?

Answer 16

count the number of consecutive R-waves and multiply by 10, or 1500 divided by small boxes between consecutive R-waves