Deck 32: Principles of the Electrocardiogram

Question 1

Lead ____ notes the change between the right arm and left leg.

A) I
B) II
C) III
D) IV

Answer 1

II

Question 2

Lead ____ measures change between the left arm and left leg.

A) I
B) II
C) III
D) IV

Answer 2

III

Question 3

Lead II measures the voltage change between the right arm and the left arm.

Answer 3

False

Question 4

The SA pacemaker cells generally depolarize more times per minute and thus have a faster pacing rate, called the intrinsic rate.

Question 5

Einthoven's Triangle visually describes the relationship of any two electrode points to any other two electrode points in the triangle.

Question 6

The term ____ is defined as the electrochemical activity of the heart's individual cells.

A) cardiac function factor
B) cardiac action factor
C) cardiac function potential
D) cardiac action potential

Question 7

The active contribution of blood to the ventricle by the atria is called the atrial kick.

Question 8

____ are a combination of two or more waves.

A) QRS complexes
B) PRS complexes
C) PRT complexes
D) QRT complexes

Question 9

The first interval on the standard ECG is the ____ interval.

A) PQ
B) PR
C) RS
D) PT

Question 10

The percentage of blood pushed and squeezed out of the heart is called the ____.

A) injection fraction
B) divergence rate
C) ejection fraction
D) pressure rate

Question 11

The SA node initiates an impulse between 50 to 75 times per minute.

Question 12

____ is the cardiac muscle fibers' ability to shorten or contract.

A) Contractility
B) Flexibility
C) Malleability
D) Reactivity

Question 13

Contractility is the transmission of the electrical stimulus from cell to cell.

Question 14

ECG waves combine in unpredictable ways to describe other cardiac events.

Question 15

The space between waves is called a(n) ____.

A) land
B) interval
C) wave
D) segment

Question 16

From outside inward, the first layer of the heart is the two-part ____.

A) myocardium
B) pericardium
C) pleural
D) epicardium

Question 17

The ____ is a muscular layer that actually performs the heart's work by contracting forcefully and ejecting blood from within the heart's chambers.

A) myocardium
B) pericardium
C) pleural
D) epicardium

Question 18

The heart is served by a special set of arteries and veins called the sinus circulation.

Question 19

The heart lies within the thoracic cavity, an area in the center of the chest.

Question 20

If the PR interval is shortened, it may be indicative of an accessory pathway and may lead to pre-excitation syndrome.

Question 21

The ____________________ is considered the heart's outermost part.

Question 22

A(n) ____________________ is a view of the heart's electrical activity from a specific vantage point.

Question 23

A segment and a wave together are called a(n) ____________________.

Question 24

Assessment of the heart's ____________________ activity forms a basis for cardiac physical assessment.

Question 25

____________________ fibers connect directly with the ventricular myocardium, allowing the ventricles to contract nearly simultaneously as a functional syncytium.