Question 1

Which statement is not true about V-fib?

Accepted Answer

A) It typically is preceded by V-tach. 
B) It results in death quickly if not treated effectively. 
C) The patient can be stabilized with powerful cardiovascular medications. 
D) It may lead to asystole. 
A) It typically is preceded by V-tach. 
B) It results in death quickly if not treated effectively. 
C) The patient can be stabilized with powerful cardiovascular medications. 
D) It may lead to asystole.

Question 2

The augmented leads, which include aVR and aVL, record the electrical activity between specific points on the chest wall and within the heart.

Accepted Answer

A) True 
 B)False

Question 3

What part of the ECG complex represents atrial depolarization?

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 4

The QRS complex shows as a negative deflection in V₁ and V₂ views.

Accepted Answer

A) True 
 B)False

Question 5

Which cardiac diagnostic tool requires the patient to exercise during the procedure?

Accepted Answer

A) Heart scan 
B) Stress test 
C) Holter monitor 
D) Event monitor 
A) Heart scan 
B) Stress test 
C) Holter monitor 
D) Event monitor

Question 6

A diary of daily activities is part of the procedure for performing which of the following?

Accepted Answer

A) Heart scan 
B) Stress test 
C) Holter monitor 
D) Pacemaker reading 
A) Heart scan 
B) Stress test 
C) Holter monitor 
D) Pacemaker reading

Question 7

The right leg is used to ground the recording of the augmented leads.

Accepted Answer

A) True 
 B)False

Question 8

The __________ on an ECG machine creates the image on the ECG paper.

Accepted Answer

stylus
The stylus on

Question 9

Digitalis toxicity may cause specific ECG changes.

Accepted Answer

A) True 
 B)False

Question 10

ECG paper has horizontal and vertical lines at __________ intervals.

Accepted Answer

1-mm
ECG paper has h

Question 11

Lead I records the electrical activity between the right arm and the left arm.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is seen on the ECG strip of a patient with an MI?

Accepted Answer

A) Elevated ST segments 
B) Elevated T waves 
C) Extended QRST segments 
D) Absent T wave 
A) Elevated ST segments 
B) Elevated T waves 
C) Extended QRST segments 
D) Absent T wave

Question 13

PACs may be recorded in patients who smoke or consume large quantities of caffeine.

Accepted Answer

A) True 
 B)False

Question 14

Patients with a history of V-fib may be treated with an ICD.

Accepted Answer

A) True 
 B)False

Question 15

A primary responsibility of the medical assistant when obtaining an ECG is to prevent artifacts or correct the problem that created an artifact and try again to print a clean strip.Explain the four artifacts that can occur, give an example of why the artifact might occur, and explain what the medical assistant can do to solve the problem.

Accepted Answer

• Wandering baseline: The stylus gradual

Question 16

The electrodes of the ECG carry cardiac electrical impulses into the machine, where they are magnified by an amplifier.

Accepted Answer

A) True 
 B)False

Question 17

Preparation of a patient for an ECG includes:

Accepted Answer

A) placing the electrodes over bony prominences on the arms and legs 
B) making sure the bed is pushed against the wall to stabilize the unit 
C) placing the ground electrode at V6 
D) instructing female patients to remove their bra and pantyhose 
A) placing the electrodes over bony prominences on the arms and legs 
B) making sure the bed is pushed against the wall to stabilize the unit 
C) placing the ground electrode at V6 
D) instructing female patients to remove their bra and pantyhose

Question 18

An abrasive device must be applied to each electrode placement site before an ECG can be obtained.

Accepted Answer

A) True 
 B)False

Question 19

The skin is an excellent conductor of electrical activity.

Accepted Answer

A) True 
 B)False

Question 20

If the ECG recording appears with the baseline rising and falling, the medical assistant should:

Accepted Answer

A) check for nearby electric appliances 
B) check electrode attachment 
C) continue recording the ECG 
D) check the cable connections to the electrodes 
A) check for nearby electric appliances 
B) check electrode attachment 
C) continue recording the ECG 
D) check the cable connections to the electrodes

Exam 49: Principles of Electrocardiography

Which statement is not true about V-fib?

The augmented leads, which include aVR and aVL, record the electrical activity between specific points on the chest wall and within the heart.

What part of the ECG complex represents atrial depolarization?

The QRS complex shows as a negative deflection in V₁ and V₂ views.

Which cardiac diagnostic tool requires the patient to exercise during the procedure?

A diary of daily activities is part of the procedure for performing which of the following?

The right leg is used to ground the recording of the augmented leads.

The __________ on an ECG machine creates the image on the ECG paper.

Digitalis toxicity may cause specific ECG changes.

ECG paper has horizontal and vertical lines at __________ intervals.

Lead I records the electrical activity between the right arm and the left arm.

Which of the following is seen on the ECG strip of a patient with an MI?

PACs may be recorded in patients who smoke or consume large quantities of caffeine.

Patients with a history of V-fib may be treated with an ICD.

The electrodes of the ECG carry cardiac electrical impulses into the machine, where they are magnified by an amplifier.

Preparation of a patient for an ECG includes:

An abrasive device must be applied to each electrode placement site before an ECG can be obtained.

The skin is an excellent conductor of electrical activity.

If the ECG recording appears with the baseline rising and falling, the medical assistant should:

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