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

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1

at rest, cardiac cells are electrically ____

negative

2

fundamental electrical event of the heart

depolarization

3

after depolarization, cardiac cells restore to their resting polarity through

repolarization

4

SA node (sinus node) rate

60-100 times/min

5

3 characteristics of wave

1. duration
2. amplitude
3. configuration

6

bundle of His emerges into

right and left bundle branches

7

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

right bundle branch

8

left bundle branch divides into

3 major fascicles:

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

9

carries current down posterior surface of left ventricle

posterior fascicle

10

carries current down anterior surface of left ventricle

anterior fascicle

11

carries current down interventricular septum

septal fascicle

12

first downward deflection

Q wave

13

first upward deflection

R wave

14

second upward deflection

R' (R-prime)

15

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

PR interval

16

measures time from end of depolarization to start ventricular depolarization

PR segment

17

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

ST segment

18

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

QT interval

19

measures time of ventricular depolarization

QRS interval

20

limb leads

I, II, III, avL, avR, avF

21

lead I angle of orientation

0 degrees

22

lead II angle of orientation

+ 60 degrees

23

lead III angle of orientation

+ 120 degrees

24

lead I is created by making ____

left arm positive and right arm negative

25

lead II is created by making ____

legs positive and right arm negative

26

lead III is created by making ____

legs positive and left arm negative

27

lead avL angle of orientation

- 30 degrees

28

lead avR angle of orientation

- 150 degrees

29

lead avF angle of orientation

+ 90 degrees

30

lead avL created by making ____

left arm positive and other limbs negative