EKG normals

Question 1

Which wave shows atrial depolarization?

Answer 1

p wave

Question 2

which wave shows ventricular depolarization?

Answer 2

QRS

Question 3

Which wave shows ventricular repolarization?

Answer 3

t wave

Question 4

What degree is Lead I?

Answer 4

0

Question 5

What degree is lead II?

Answer 5

+60

Question 6

What degree is lead III?

Answer 6

+120

Question 7

what degree is aVL?

Answer 7

-30

Question 8

what degree is aVR?

Answer 8

-150

Question 9

What degree is aVF?

Answer 9

+90

Question 10

How many miliseconds is one box?

5 boxes?

Answer 10

1 box = 40 miliseconds (0.04s)

5 boxes = 200 miliseconds (0.2s)

Question 11

What happens to the QT interval at a faster HR?

Answer 11

it shortens

Question 12

what’s a quick way to check if the QT interval is prolonged?

Answer 12

shouldn’t be more than 50% of the way between R-R intervals

(if HR is between 50-100bpm)

Question 13

What does the Y axis of the EKG represent?

Answer 13

voltage

Question 14

The Q wave represents depol of ____, the R wave represents depol of ____, and the S wave represents depol of ____.

Answer 14

Q: Bundle of His

R: Bundle branches

S: terminal Perkinje fibers

Question 15

Where is V1 placed?

Answer 15

4th intercostal space to the R of the sternum

Question 16

Where is v2 placed?

Answer 16

4th intercostal space to the left of the sternum

Question 17

Where is v4 placed?

Answer 17

5th intercostal space in midclavicular line

Question 18

Where is v6 placed?

Answer 18

5th intercostal space in midaxillary line

Question 19

How many boxes should the p wave be smaller than?

Answer 19

2.5 boxes

Question 20

how long should the PR interval be?

Answer 20

120-200 ms

Question 21

How long should the QRS interval be?

Answer 21

80-105 ms

Question 22

In a normal EKG, where will the QRS complex be inverted?

Answer 22

aVR, V1, V2

Question 23

What do the R waves look like in the precordial regions of an EKG?

Answer 23

R wave progression - starts almost non-existent at V1, then slowly progresses and is largest at V6

Question 24

In what direction is the normal axis/vector?

Answer 24

inferiorly toward the left!