Question 1

Very tall QRS complexes are usually caused by:

Accepted Answer

A)   impulses that originate from the ventricles.
B)   a rhythm that is initiated from the SA node, atria, or AV junction.
C)   a delay in the movement of the electrical impulse between the right and left ventricles.
D)   hypertrophy of one or both ventricles.

Question 2

The QRS complexes should appear normal if:

Accepted Answer

A)   the rhythm is initiated from the SA node, atria, or AV junction.
B)   conduction is delayed as the impulse progresses from the bundle of His, through the right and left bundle branches, and through the Purkinje network.
C)   it originates from the ventricles.
D)   there is a conduction delay through the ventricles.

Question 3

When referring to the QRS complex, waveforms of normal or greater than normal amplitude are denoted with a large case letter, whereas waveforms less than 5 mm amplitude are denoted with a small case letter.

Accepted Answer

A) True 
 B)False

Question 4

Impulses that arise from the ventricles produce QRS complexes that:

Accepted Answer

A)   look the same as the QRS complexes which are produced by impulses originating from the SA node.
B)   are called R prime or R' waves.
C)   are typically notched and biphasic.
D)   appear wide and bizarre-looking.

Question 5

Wide, bizarre-looking QRS complexes that are seen with sinus rhythm may be caused by:

Accepted Answer

A)   bundle branch block.
B)   hypertrophy.
C)   pleural effusion.
D)   atrial enlargement.

Question 6

The R wave:

Accepted Answer

A)   precedes the Q wave.
B)   is the first positive deflection in the QRS complex.
C)   is the first negative deflection that extends below the baseline.
D)   is less than 25% of the amplitude of the S wave in that lead. B

Question 7

The QRS complex is larger than the P wave because ventricular depolarization involves a considerably larger muscle mass than atrial depolarization.

Accepted Answer

A) True 
 B)False

Question 8

The S wave in the QRS complex is:

Accepted Answer

A)   the negative deflection that follows the R wave and extends below the baseline
B)   sometime absent.
C)   triangular shaped.
D)   normally 0.04 seconds in duration and has an amplitude of 5 to 30 mm.

Question 9

Asystole is a lack of any cardiac activity in the ventricles and is seen as a flat line on the ECG tracing.

Accepted Answer

A) True 
 B)False

Question 10

Normal QRS complexes are those that:

Accepted Answer

A)   look different.
B)   are inverted.
C)   are upright and narrow.
D)   are wide and bizarre.

Question 11

Low-voltage or abnormally small QRS complexes may be seen in obese patients, hyperthyroid patients, and pleural effusion.

Accepted Answer

A) True 
 B)False

Question 12

In which of the following will the QRS complex have higher amplitude?

Accepted Answer

A)   The elderly.
B)   In women.
C)   The precordial leads.
D)   When there is fluid in the pericardial sac. C

Question 13

To measure the duration of a QRS complex start by finding the point where the first wave of the complex begins to deviate from the baseline and the end where the R wave joins the S wave.

Accepted Answer

A) True 
 B)False

Question 14

Ventricular fibrillation:

Accepted Answer

A)   is seen as a flat line on the ECG tracing.
B)   is caused by erratic firing of the ventricles
C)   should be promptly treated with defibrillation.
D)   b and c

Question 15

In leads I, II, III, aVL, aVF, and V4 to V6, the deflection of the QRS complex is characteristically:

Accepted Answer

A)   upright.
B)   biphasic
C)   inverted
D)   biphasic or inverted.

Question 16

Aberrant conduction occurs when:

Accepted Answer

A)   there is a blockage in one or both bundle branches.
B)   an impulse arises from the ventricles and stimulates the atria in a retrograde manner.
C)   early impulses are carried through one bundle branch while the other is still refractory after conducting a previous electrical impulse.
D)   An impulse travels to the ventricles through an accessory pathway. C

Question 17

With ventricular preexcitation there is an abnormal slurring and notching at the onset of the QRS complex. This is called a ______ wave.

Accepted Answer

A)   alpha
B)   QS
C)   R'R
D)   delta

Question 18

If the Q wave is absent, we measure the QRS complex from the beginning of the R wave.

Accepted Answer

A) True 
 B)False

Question 19

Tachycardia arising from the ventricles is said to be present when there are three or more early beats (arising from the ventricles) in a row or the heart rate is sustained at a rate of between 100 and 250 beats per minute.

Accepted Answer

A) True 
 B)False

Question 20

A positive impulse immediately following the R wave is called:

Accepted Answer

A)   S prime.
B)   R prime.
C)   double R prime.
D)   double S prime.

Exam 7: QRS Complexes

Very tall QRS complexes are usually caused by:

Correct AnswerverifiedShow Answer

The QRS complexes should appear normal if:

Correct AnswerverifiedShow Answer

When referring to the QRS complex, waveforms of normal or greater than normal amplitude are denoted with a large case letter, whereas waveforms less than 5 mm amplitude are denoted with a small case letter.

Correct AnswerverifiedShow Answer

Impulses that arise from the ventricles produce QRS complexes that:

Correct AnswerverifiedShow Answer

Wide, bizarre-looking QRS complexes that are seen with sinus rhythm may be caused by:

Correct AnswerverifiedShow Answer

The R wave:

Correct AnswerverifiedB

The QRS complex is larger than the P wave because ventricular depolarization involves a considerably larger muscle mass than atrial depolarization.

Correct AnswerverifiedShow Answer

The S wave in the QRS complex is:

Correct AnswerverifiedShow Answer

Asystole is a lack of any cardiac activity in the ventricles and is seen as a flat line on the ECG tracing.

Correct AnswerverifiedShow Answer

Normal QRS complexes are those that:

Correct AnswerverifiedShow Answer

Low-voltage or abnormally small QRS complexes may be seen in obese patients, hyperthyroid patients, and pleural effusion.

Correct AnswerverifiedShow Answer

In which of the following will the QRS complex have higher amplitude?

Correct AnswerverifiedC

To measure the duration of a QRS complex start by finding the point where the first wave of the complex begins to deviate from the baseline and the end where the R wave joins the S wave.

Correct AnswerverifiedShow Answer

Ventricular fibrillation:

Correct AnswerverifiedShow Answer

In leads I, II, III, aVL, aVF, and V4 to V6, the deflection of the QRS complex is characteristically:

Correct AnswerverifiedShow Answer

Aberrant conduction occurs when:

Correct AnswerverifiedC

With ventricular preexcitation there is an abnormal slurring and notching at the onset of the QRS complex. This is called a ______ wave.

Correct AnswerverifiedShow Answer

If the Q wave is absent, we measure the QRS complex from the beginning of the R wave.

Correct AnswerverifiedShow Answer

Tachycardia arising from the ventricles is said to be present when there are three or more early beats (arising from the ventricles) in a row or the heart rate is sustained at a rate of between 100 and 250 beats per minute.

Correct AnswerverifiedShow Answer

A positive impulse immediately following the R wave is called:

Correct AnswerverifiedShow Answer

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B

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C

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C

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