Question 1

Sinus arrhythmia is a result of the abnormal flow of the electrical system of the heart.

Accepted Answer

A) True 
 B)False

Question 2

A patient with Parkinson's disease may have which of the following artifacts?

Accepted Answer

A) AC 
B) Somatic tremor 
C) Wandering baseline 
D) Interrupted baseline 
A) AC 
B) Somatic tremor 
C) Wandering baseline 
D) Interrupted baseline

Question 3

The precordial, or chest, leads are __________ and are designated V₁, V₂, V₃, V₄, V₅, and V₆.

Accepted Answer

unipolar
The precordial, or ch

Question 4

To check the standardization of the ECG machine, the medical assistant depresses the standardization button.The stylus should deflect how many millimeters?

Accepted Answer

A) 20 
B) 5 
C) 15 
D) 10 
A) 20 
B) 5 
C) 15 
D) 10

Question 5

________ is the relaxation phase of the heart.

Accepted Answer

A) Systole 
B) Diastole 
C) Cardioversion 
D) None of the above 
A) Systole 
B) Diastole 
C) Cardioversion 
D) None of the above

Question 6

Which statement is true about NSR?

Accepted Answer

A) It is a regular heart rate that falls within the average range of 60 to 80 bpm. 
B) It is a heart rate less than 60 bpm. 
C) It is a heart rate of greater than 100 bpm. 
D) It is an irregular heart rate that falls within the average range of 60 to 80 bpm. 
A) It is a regular heart rate that falls within the average range of 60 to 80 bpm. 
B) It is a heart rate less than 60 bpm. 
C) It is a heart rate of greater than 100 bpm. 
D) It is an irregular heart rate that falls within the average range of 60 to 80 bpm.

Question 7

Atrial flutter may occur if:

Accepted Answer

A) the electrical charge does not pass out of the SA node 
B) the ventricles contract repeatedly 
C) ectopic atrial beats occur 
D) the patient consumes too much caffeine 
A) the electrical charge does not pass out of the SA node 
B) the ventricles contract repeatedly 
C) ectopic atrial beats occur 
D) the patient consumes too much caffeine

Question 8

The electrical activity of the heart is initiated in specialized tissue, called the __________, which is located in the superior-posterior wall of the right atrium.

Accepted Answer

SA node
The electrical activit

Question 9

The first three leads recorded are called the standard, or __________, limb leads, because they each use two limb electrodes to record the heart's electrical activity.

Accepted Answer

bipolar
The first three leads

Question 10

The _________ reflects the time between the end of ventricular contraction and the beginning of ventricular recovery.

Accepted Answer

A) U wave 
B) QRS complex 
C) ST segment 
D) QT interval 
A) U wave 
B) QRS complex 
C) ST segment 
D) QT interval

Question 11

Six-channel ECG strips must be cut and mounted before they are placed in the patient's medical record.

Accepted Answer

A) True 
 B)False

Question 12

The greatest deflection from the baseline on the ECG is the:

Accepted Answer

A) P wave 
B) T wave 
C) ST segment 
D) QRS complex 
A) P wave 
B) T wave 
C) ST segment 
D) QRS complex

Question 13

When a patient is in __________, the person has no pulse.

Accepted Answer

ventricular fibrilla

Question 14

A cardiac __________ is a diagnostic procedure performed to evaluate the patient's myocardial response to measured exercise.

Accepted Answer

stress test
A cardiac stress t

Question 15

The AV node sends the electric impulse through the __________, which stimulates the right and left ventricular walls.

Accepted Answer

bundle of His
The AV node send

Question 16

A monitor that a patient wears for 24 hours is called a(n):

Accepted Answer

A) 12-lead 
B) Holter 
C) halter 
D) echocardiogram 
A) 12-lead 
B) Holter 
C) halter 
D) echocardiogram

Question 17

One of the most specific ECG changes that occurs in patients with an MI is elevated T waves.

Accepted Answer

A) True 
 B)False

Question 18

If the ECG recording appears as a series of interruptions on the baseline, the medical assistant should:

Accepted Answer

A) check for nearby electric appliances 
B) ask the patient to lie still 
C) help the patient relax and stay warm 
D) check the cable connections to the electrodes 
A) check for nearby electric appliances 
B) ask the patient to lie still 
C) help the patient relax and stay warm 
D) check the cable connections to the electrodes

Question 19

Tachycardia is defined as:

Accepted Answer

A) a faster than normal heart rate 
B) a condition in which the patient has difficulty breathing when lying down 
C) dizzy spells 
D) a condition in which the heartbeat is irregular 
A) a faster than normal heart rate 
B) a condition in which the patient has difficulty breathing when lying down 
C) dizzy spells 
D) a condition in which the heartbeat is irregular

Question 20

Electron beam tomography helps screen for cardiac risk by:

Accepted Answer

A) determining the extent of MI damage 
B) assessing the amount of calcium in the coronary arteries 
C) measuring the potassium levels in the heart muscle 
D) determining the strength of the myocardial wall 
A) determining the extent of MI damage 
B) assessing the amount of calcium in the coronary arteries 
C) measuring the potassium levels in the heart muscle 
D) determining the strength of the myocardial wall

Exam 49: Principles of Electrocardiography

Sinus arrhythmia is a result of the abnormal flow of the electrical system of the heart.

A patient with Parkinson's disease may have which of the following artifacts?

The precordial, or chest, leads are __________ and are designated V₁, V₂, V₃, V₄, V₅, and V₆.

To check the standardization of the ECG machine, the medical assistant depresses the standardization button.The stylus should deflect how many millimeters?

________ is the relaxation phase of the heart.

Which statement is true about NSR?

Atrial flutter may occur if:

The electrical activity of the heart is initiated in specialized tissue, called the __________, which is located in the superior-posterior wall of the right atrium.

The first three leads recorded are called the standard, or __________, limb leads, because they each use two limb electrodes to record the heart's electrical activity.

The _________ reflects the time between the end of ventricular contraction and the beginning of ventricular recovery.

Six-channel ECG strips must be cut and mounted before they are placed in the patient's medical record.

The greatest deflection from the baseline on the ECG is the:

When a patient is in __________, the person has no pulse.

A cardiac __________ is a diagnostic procedure performed to evaluate the patient's myocardial response to measured exercise.

The AV node sends the electric impulse through the __________, which stimulates the right and left ventricular walls.

A monitor that a patient wears for 24 hours is called a(n):

One of the most specific ECG changes that occurs in patients with an MI is elevated T waves.

If the ECG recording appears as a series of interruptions on the baseline, the medical assistant should:

Tachycardia is defined as:

Electron beam tomography helps screen for cardiac risk by:

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