Question 1

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. 
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 2

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

Question 3

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. 
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 4

Normal QRS complexes are those that:

Accepted Answer

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

Question 5

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

Question 6

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 7

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 8

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 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

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. 
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 11

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

Question 12

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. 
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 13

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 
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 14

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

Question 15

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 16

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 17

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. 
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 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

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. 
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 20

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

Exam 7: QRS Complexes

Aberrant conduction occurs when:

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

The R wave:

Normal QRS complexes are those that:

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

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.

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.

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.

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

The S wave in the QRS complex is:

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

Impulses that arise from the ventricles produce QRS complexes that:

Ventricular fibrillation:

A positive impulse immediately following the R wave is called:

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

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

The QRS complexes should appear normal if:

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

Very tall QRS complexes are usually caused by:

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

Anatomy and Electrophysiology of the Heart

The Electrocardiogram

Analyzing the Electrocardiogram

Heart Rate

Regularity

P-Waves

PR Intervals

ST Segments, T-Waves, QT Intervals, and U-Waves

Overview of Dysrhythmias

Origin and Clinical Aspects of Sinus Node Dysrhythmias

Origin and Clinical Aspects of Atrial Dysrhythmias

Origin and Clinical Aspects of Junctional Dysrhythmias

Origin and Clinical Aspects of Ventricular Dysrhythmias

Origin and Clinical Aspects of AV Heart Blocks

Pacemakers and Implanted Cardioverter-Defibrillators

12 Lead ECGS

Atrial Enlargement and Ventricular Hypertrophy

Bundle Branch Block

Myocardial Ischemia and Infarction

Other Cardiac Conditions and the ECG

Putting It All Together

Filters