1-35

Question 1

What does the P wave represent?

Answer 1

depolarization of the atrial myocardium

Question 2

How does the autonomic nervous system influence the AV node?

Answer 2

vagal- slows it, sympathetic- accelerates it

Question 3

What are the 3 components of the ventricular conducting system?

Answer 3

1- bundle of his, 2- bundle branches, 3- Purkinke fibbers

Question 4

What are the 3 components of the left bundle branch?

Answer 4

septal fascicle, anterior fascicle, posterior fascicle

Question 5

What does the QRS complex represent?

Answer 5

ventricular depolarization

Question 6

What does the Q wave represent?

Answer 6

depolarization of the intraventricular septum

Question 7

What does the T wave represent?

Answer 7

ventricular repolarization

Question 8

What is a segment?

Answer 8

Straight line connecting two waves

Question 9

What is an interval?

Answer 9

A part that includes at least one wave plus connecting straight line

Question 10

PR is an ___

Answer 10

interval

Question 11

What does the PR interval measure?

Answer 11

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

Question 12

What does the PR segment measure?

Answer 12

the time from the end of atrial depolarization to the start of ventricular depolarization

Question 13

What does the ST segment measure?

Answer 13

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

Question 14

What does the QT interval measure?

Answer 14

the time from the beginning of ventricular depolarization to the end of ventricular repolarization

Question 15

What is the angle of lead I?

Answer 15

0 (left arm +, right arm-)

Question 16

What is the angle of lead II?

Answer 16

60(legs+,right arm-)

Question 17

What is the angle of lead III?

Answer 17

120(legs+,left arm-)

Question 18

What is the angle of lead aVL?

Answer 18

.-30 (left arm +, other limbs -)

Question 19

What is the angle of lead aVR?

Answer 19

.-150 (right arm +, other limbs -)

Question 20

What is the angle of lead aVF?

Answer 20

90 (legs +, other limbs negative)

Question 21

what are the inferior leads?

Answer 21

II, III, aVF,

Question 22

what are the left lateral leads?

Answer 22

I, aVL, V5, V6

Question 23

what are the right lateral leads?

Answer 23

aVR, V1

Question 24

the limb leads are on the ___ plane

Answer 24

frontal

Question 25

the precordial leads are on the ___ plane

Answer 25

horizontal

Question 26

where V1 is placed?

Answer 26

fourth intercostal space to the right of the sternum

Question 27

where V2 is placed?

Answer 27

fourth intercostal space to the left of the sternum

Question 28

where V3 is placed?

Answer 28

between V2 and V4

Question 29

where V4 is placed?

Answer 29

fifth intercostal space in the midclavicular line

Question 30

where V5 is placed?

Answer 30

between V4 and V6

Question 31

where V6 is placed?

Answer 31

fifth intercostal space in the midaxillary line

Question 32

what are the anterior leads?

Answer 32

V2, V3, V4

Question 33

P wave is usually positive in the __ lateral and ___ leads

Answer 33

``` left lateral leads (I, aVL, V5, V6) inferior leads (II, III, aVF) ```

Question 34

P wave is most positive in lead ___, and most negative in lead ___

Answer 34

II, aVR

Question 35

tall R waves can be seen in the __ lateral and __ leads.

Answer 35

``` left lateral leads (I, aVL, V5, V6), inferior leads (II, III, aVF) ```