Recording an EKG

Question 1

The 12 leads are named leads ____

Answer 1

I, II, III, aVR, aVL, aVF, V1, V2, V3, V4, V5, & V6

Question 2

The two main leads on a 12 lead EKG are:

Answer 2

Limb leads and precordial leads

Question 3

Even though the EKG prints with 12 different
leads recorded, the machine does this using only ____ electrodes placed in specific places

Answer 3

10

Question 4

Limb Leads placement

Answer 4

One lead placed on each of the four limbs,
preferably on the forearm/wrists and
shins/ankles.

Question 5

Precordial Leads placement

Answer 5

Six leads placed across the chest in different locations

Question 6

The Frontal Plane (coronal) refers to

Answer 6

Envision this as a large circle superimposed on the
patient’s chest, with the circle marked off in degrees.
○ 0 degrees is to the patient’s left.
○ +90 degrees is down and -90 degrees is up
○ 180 degrees is to the patient’s right

Question 7

Basically, the six limb leads view the electrical forces of
the heart moving ____ through
this frontal plane circle

Answer 7

up and down and left and right

Question 8

The EKG machine is programmed to use the four limb electrodes to produce the tracings of the six limb leads by variably designating leads as ____

Answer 8

positive and negative

Question 9

T/F Each lead has its own specific view of the heart

Answer 9

T

Question 10

____ - Created by making left
arm positive and right arm
negative (Angle = 0 degrees)

Answer 10

Lead I

Question 11

_____ - Created by making the
legs positive and the right arm
negative (Angle = 60 deg).

Answer 11

Lead II

Question 12

_____ - Created by making
the legs positive and the left
arm negative (Angle = 120 deg)

Answer 12

Lead III

Question 13

_____ - Created by making
Left arm positive and all others
negative (Angle = -30 deg)

Answer 13

Lead aVL

Question 14

____ - Created by making
Right arm positive and all others
negative (Angle = -150 deg)

Answer 14

Lead aVR

Question 15

____ - Created by making
the Feet positive and the arms
negative (Angle = +90 deg)

Answer 15

Lead aVF

Question 16

The six Precordial Leads (also called the chest leads) are arranged across the
heart in ____

Answer 16

a Horizontal Plane, helping us see the heart in 3-dimensions

Question 17

Precordial leads are a little more simple
than the limb leads and record impulses
moving _____

Answer 17

anteriorly and posteriorly

Question 18

Precordial leads locations

Answer 18

○ V1 - 4th ICS along Right sternal border
○ V2 - 4th ICS along Left sternal border
○ V3 - Mid-way between V2 and V4
○ V4 - 5th ICS at midclavicular line
○ V5 - 5th ICS at anterior axillary line
○ V6 - 5th ICS at midaxillary line

Question 19

Leads V1-V4 view the ____ wall of the
heart

Answer 19

anterior

Question 20

V1 and V2 are also said to visualize
the _____ best

Answer 20

interventricular septum

Question 21

Leads V5 and V6 visualize the _____ wall
of the heart best from their vantage point.

Answer 21

lateral

Question 22

Inferior Leads

Answer 22

II, III, and aVF

Question 23

Lateral Leads

Answer 23

I, aVL, V5, and V6

Question 24

Anterior Leads

Answer 24

V1, V2, V3, and V4

Question 25

Septal Leads

Answer 25

V1 and V2

Question 26

a 12-Lead EKG records the
impulses over ____ seconds from 12
different vantage points

Answer 26

6

Question 27

It’s important to recognize that each EKG electrode records only the
_____. What is this called?

Answer 27

AVERAGE current flow at any given moment
○ We generally call this average the Vector
○ The vector’s angle of orientation represents the average direction of
current flow through the tissue

Question 28

When the ventricles depolarize, they depolarize from ____ to ____.

Answer 28

right shoulder; left hip