Deck 6: Electrocardiography

Question 1

When the heart is stimulated and contracts,this is termed _____________.

A)depolarization.
B)repolarization.
C)pacing.
D)voltage.

Answer 1

depolarization.

Question 2

Place the steps of the heart's conduction system in the order in which the electrical activity travels through this system.
I.Bundle of HIS
II.Right and left bundle branches
III.SA node
IV.AV node
V.Purkinje fibers

A)I,II,III,IV,and V
B)III,IV,I,II,and V
C)III,I,V,II,and IV
D)III,IV,II,I,and V

Answer 2

III,IV,I,II,and V

Question 3

During depolarization and repolarization,two ions are exchanged for these processes to occur.What two ions are involved in this process?
I.Sodium
II.Potassium
III.Chloride
IV.Bicarbonate

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

Answer 3

I and II

Question 4

What happens to the heart's atria when the ventricles contract?

A)They pump blood to the ventricles
B)They contract
C)They depolarize
D)They repolarize

Question 5

What lead is placed 5th intercostal space,mid-axillary line?

A)V6
B)V5
C)V4
D)V3

Question 6

What is caused by poor electrical contact between the patient and the electrodes placed on the patient to record the ECG?

A)Patient motion
B)Wandering baseline
C)60 Hz artifact
D)Atrial fibrillation

Question 7

The patient must always be placed _________ for an ECG.

A)in semi-fowler's position
B)in a chair
C)prone
D)supine

Question 8

What lead(s)is (are)placed at the fifth intercostal space,mid-clavicular line?

A)V1 and V2
B)V3
C)V3.
D)V4

Question 9

What is the total absence of any cardiac electrical activity called?

A)Ventricular tachycardia
B)Ventricular fibrillation
C)Ventricular asystole
D)Premature ventricular contractions

Question 10

When looking at the ECG graph paper,you notice the 'P-R' interval is exactly the same distance of one of the larger squares.What is this distance?

A)1 millivolt
B)1 second
C)0.04 seconds
D)0.20 seconds

Question 11

Which of the following waves in an ECG tracing represents atrial depolarization?

A)'P' wave
B)'QRS'complex
C)'T' wave
D)'U' wave

Question 12

Which of the following waves in an ECG tracing represents ventricular repolarization?

A)'P' wave
B)'QRS' complex
C)'T' wave
D)'U' wave

Question 13

What lead is placed at the 5th intercostal space,anterior axillary line?

A)V3
B)V4
C)V5
D)V6

Question 14

What is located by palpating the patient's sternal angle?

A)Fourth intercostal space
B)The xiphoid process
C)Second intercostal space
D)Mid clavicular line

Question 15

Which lead(s)is (are)placed at the fourth intercostal space adjacent to the sternum?

A)V1
B)V2
C)V3
D)V1 and V2

Question 16

Which of the following waves in an ECG tracing represents ventricular depolarization?

A)'P' wave
B)'QRS' complex
C)'T' wave
D)'U' wave

Question 17

When a stimulus causes the ventricles to contract in an unorganized pattern,then ____________ occurs.

A)atrial fibrillation
B)ventricular fibrillation
C)a sinus tachycardia
D)a normal sinus rhythm

Question 18

A patient has a normal 'P-R' interval,followed by a normal 'QRS' complex,and then a 'P' wave follows the 'QRS' complex.This normal ECG pattern occurs at a rate of 46/minute.What is this ECG pattern called?

A)First-degree heart block
B)Normal sinus rhythm
C)Sinus bradycardia
D)Third degree heart block

Question 19

Which of the following is the heart's pacemaker?

A)Right and left bundle branches
B)Vagus nerve
C)AV node
D)SA node

Question 20

When a stimulus only causes a small portion of the atria to contract in an unorganized pattern,then ____________ occurs.

A)atrial fibrillation
B)ventricular fibrillation
C)a normal sinus rhythm
D)a sinus tachycardia

Question 21

Why are augmented leads used in the ECG tracing?

A)They weaken the strong signals from the limb leads
B)They amplify the weak signal more than is needed for the leads to generate a useful tracing
C)They depolarize the limb leads so that there is a unidirectional polarity
D)They can determine the axes of the heart

Question 22

Leads I,II,and III and the augmented leads are _______ containing both a positive and negative electrode whereas the precordial leads are _________ and are helpful in the diagnosis of a myocardial infarction.

A)bipolar;unipolar
B)unipolar;bipolar
C)tripolar;bipolar
D)synchronized;asynchronized

Question 23

When atrial fibrillation occurs atrial depolarization does not occur.How is this identified on the ECG tracing?

A)The are multiple 'P' waves to each 'QRS' complex on the ECG tracing
B)The 'P' is inverted in lead 2
C)The 'QRS' complex is irregularly spaced
D)There is no 'P' wave on the ECG tracing

Question 24

Cleaning the patient's skin with isopropyl alcohol,using more electrode cream,or cleaning the electrode contacts and connections can help with which of the following?

A)Wandering baseline
B)Determining the area of myocardial infarction
C)Determining the presence of a 'P' wave
D)Differentiation between right or left axis deviation

Question 25

A female patient comes to the emergency department complaining of chest pain.She is from a very conservative culture and objects to a male performing her EKG.How should the male practitioner approach this problem since no female is available to do the EKG?

Question 26

An extremely obese patient is to ordered to have an EKG.What problems could be encountered and how should they be approached?

Question 27

Which of the following is NOT normally a cause of ECG artifact?

A)Patient motion artifact
B)Wandering baseline
C)60 Hz artifact
D)Cell phone interference

Question 28

The patient wants an exercise EKG.To ensure the electrodes stay remain in the proper position,what precautions should be taken?