Cardiac Disorders and 12 Lead EKG Part 5

Question 1

Views the heart in a vertical plane is synonymous with what plane?

Answer 1

frontal plane

Question 2

In this frontal plane image, limb leads view heart’s electrical activity (depolarization & repolarization) moving in what directions (name in order) through this circle?

Answer 2

up, down, right, and left

Question 3

What lead is this?

LA +

RA -

Angle of orientation is ___º

Answer 3

Lead I

0

Question 4

What lead is this?

Legs +

RA -

Angle = ____º

Answer 4

Lead II

60

Question 5

What lead is this?

legs +

left arm -

Angle is ____º

Answer 5

III

120

Question 6

What lead is this?

left arm +

other limbs -

Angle is ____º

Answer 6

aVL

-30

Question 7

What lead is this?

RA +

Other limbs -

Angle is ___º

Answer 7

aVR

-150

Question 8

What lead is this?

Legs +

Other limbs -

Angle is ___º

Answer 8

aVF

90

Question 9

The 6 precordial leads arranged across chest in horizontal plane, views heart’s electrial activity moving _______ and ______.

Answer 9

anteriorly & posteriorly

Question 10

What lead is placed at 4th ICS right of sternum?

Answer 10

V1

Question 11

What lead is placed at the 4th ICS left of sternum?

Answer 11

V2

Question 12

What lead is placed at the 5th ICS in the midclavicular line?

Answer 12

V4

Question 13

Lead V3 is placed where?

Answer 13

between V2 and V4

Question 14

What lead is placed in the 5th ICS in the midaxillary line?

Answer 14

V6

Question 15

Where is lead V5 placed?

Answer 15

between V4 and V6

Question 16

Inferior leads are what 3 leads?

Answer 16

II

III

aVF

Question 17

Left lateral leads are what leads? (4)

Answer 17

I

aVL

V5

V6

Question 18

Anterior leads are what leads? (2)

Answer 18

V3

V4

Question 19

Lead aVR is _____.

Answer 19

alone

Question 20

Light lines on the EKG, small boxes are __ x___mm squares.

Answer 20

1x1

Question 21

Dark lines, or large box on the EKG strip are ___x___ mm squares

Answer 21

5 X 5

Question 22

Small square distance = ____ sec

Answer 22

0.04

Question 23

Large square distance= ____sec

Answer 23

0.2

Question 24

Vertical axis on EKG strip is _____.

Answer 24

voltage

Question 25

Horizontal axis or EKG strip is \_\_\_\_\_.

Answer 25

time

Question 26

Each small square on y-axis is \_\_\_mV

Answer 26

0.1

Question 27

Each large square on y-axis is \_\_\_\_mV.

Answer 27

0.5 mV

Question 28

Atrial depolarization begins at SA node and is indicated on the EKG as \_\_\_\_\_\_.

Answer 28

P wave

Question 29

\_\_\_ wave Vector of current flow points from R→L and inferiorly.

Answer 29

P wave

Question 30

The P Wave Any lead that views the wave of atrial depolarization as moving toward it will record a ____ deflection (I, aVL, II, aVF, V5, V6)

Answer 30

positive

Question 31

The P Wave As moving perpendicular to it will record a ____ wave (III V1)

Answer 31

biphasic

Question 32

The P Wave As moving away from it will record a ______ deflection (aVR)

Answer 32

negative

Question 33

What represents the time from the start of atrial depolarization to the start of ventricular depolarization including delay in conduction from AV node?

Answer 33

PR Interval

Question 34

PR interval = \_\_\_\_-\_\_\_\_seconds

Answer 34

0.12 - 0.2

Question 35

Definition: The interventricular septum depolarizes left-to-right and a small negative deflection can be seen in: I, aVL, V5, and V6.

Answer 35

Septal Q-waves

Question 36

Definition: Ventricular (LV) depolarization current vector points 0-90º. Large positive R waves are seen in (I, II, III, aVL, aVF, V5, V6,) and negative R wave in aVR. \* Note: **R wave progression** in precordial leads.

Answer 36

QRS complex

Question 37

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

Answer 37

ST segment

Question 38

This represent repolarization that usually begins in the last area of the heart to have been depolarized.

Answer 38

T wave

Question 39

What encompasses the time from the beginning of ventricular depolarization to the end of ventricular repolarization?

Answer 39

QT interval

Question 40

QT duration is proportionate to what?

Answer 40

HR

Question 41

What composes 40% of the cardiac cycle?

Answer 41

QT interval

Question 42

What leads are interventricular septum leads? (2)

Answer 42

V1 and V2