The Only EKG Book You'll Ever Need (Chapter 1)

Question 1

at rest, cardiac cells are electrically ____

Answer 1

negative

Question 2

fundamental electrical event of the heart

Answer 2

depolarization

Question 3

after depolarization, cardiac cells restore to their resting polarity through

Answer 3

repolarization

Question 4

SA node (sinus node) rate

Answer 4

60-100 times/min

Question 5

3 characteristics of wave

Answer 5

1. duration
2. amplitude
3. configuration

Question 6

bundle of His emerges into

Answer 6

right and left bundle branches

Question 7

carries current down right side of interventricular septum all the way to the apex of right ventricle

Answer 7

right bundle branch

Question 8

left bundle branch divides into

Answer 8

3 major fascicles:

1. septal fascicle
2. anterior fascicle
3. posterior fascicle

Question 9

carries current down posterior surface of left ventricle

Answer 9

posterior fascicle

Question 10

carries current down anterior surface of left ventricle

Answer 10

anterior fascicle

Question 11

carries current down interventricular septum

Answer 11

septal fascicle

Question 12

first downward deflection

Answer 12

Q wave

Question 13

first upward deflection

Answer 13

R wave

Question 14

second upward deflection

Answer 14

R’ (R-prime)

Question 15

measures time from start of atrial depolarization to start of ventricular depolarization

Answer 15

PR interval

Question 16

measures time from end of depolarization to start ventricular depolarization

Answer 16

PR segment

Question 17

records time from end of ventricular depolarization to start of ventricular depolarization

Answer 17

ST segment

Question 18

measures time from start of ventricular depolarization to end of ventricular repolarization

Answer 18

QT interval

Question 19

measures time of ventricular depolarization

Answer 19

QRS interval

Question 20

limb leads

Answer 20

I, II, III, avL, avR, avF

Question 21

lead I angle of orientation

Answer 21

0 degrees

Question 22

lead II angle of orientation

Answer 22

+ 60 degrees

Question 23

lead III angle of orientation

Answer 23

+ 120 degrees

Question 24

lead I is created by making ____

Answer 24

left arm positive and right arm negative

Question 25

lead II is created by making ____

Answer 25

legs positive and right arm negative

Question 26

lead III is created by making ____

Answer 26

legs positive and left arm negative

Question 27

lead avL angle of orientation

Answer 27

• 30 degrees

Question 28

lead avR angle of orientation

Answer 28

• 150 degrees

Question 29

lead avF angle of orientation

Answer 29

+ 90 degrees

Question 30

lead avL created by making ____

Answer 30

left arm positive and other limbs negative

Question 31

lead avR created by making ____

Answer 31

right arm positive and other limbs negative

Question 32

lead avF created by making ____

Answer 32

legs positive and other limbs negative

Question 33

inferior leads

Answer 33

leads II, III, avF

Question 34

left lateral leads

Answer 34

leads I, avL, V5, and V6

Question 35

V1 is placed in the ____

Answer 35

4th intercostal space to the RIGHT of the sternum

Question 36

V2 is placed in the ____

Answer 36

4th intercostal space to the LEFT of the sternum

Question 37

V3 is placed ____

Answer 37

between V2 and V4

Question 38

V4 is placed in the ____

Answer 38

5th intercostal space in the midclavicular line

Question 39

V5 is placed ____

Answer 39

between V4 and V6

Question 40

V6 is placed in the ____

Answer 40

5th intercostal space in the midaxillary line

Question 41

anterior leads

Answer 41

V1, V2, V3, and V4