Question 1

Possible sites of bundle branch block include:

Accepted Answer

A)  right bundle branch. 
B)  left anterior fascicle. 
C)  left posterior fascicle. 
D)  All of these 
A)  right bundle branch. 
B)  left anterior fascicle. 
C)  left posterior fascicle. 
D)  All of these D

Question 2

Repolarization abnormalities are uncommon in RBBB and LBBB.

Accepted Answer

A) True 
 B)False  False

Question 3

Another indicator of RBBB is/are:

Accepted Answer

A)  reciprocal late broad S waves in I, aVL , V5, and V6 
B)  a T wave that deflects opposite of the QRS complex in most leads 
C)  tall, wide, slurred R waves in I, aVL,V5, and V6 
D)  a & b 
A)  reciprocal late broad S waves in I, aVL , V5, and V6 
B)  a T wave that deflects opposite of the QRS complex in most leads 
C)  tall, wide, slurred R waves in I, aVL,V5, and V6 
D)  a & b D

Question 4

Bundle branch block:

Accepted Answer

A)  is a disorder that leads to one or both of the bundle branches conducting impulses in an accelerated manner. 
B)  produces a widened QRS complex and the R, R' configuration in the limb leads. 
C)  leads to a delay in the depolarization of the ventricle it supplies. 
D)  leads to right axis deviation. 
A)  is a disorder that leads to one or both of the bundle branches conducting impulses in an accelerated manner. 
B)  produces a widened QRS complex and the R, R' configuration in the limb leads. 
C)  leads to a delay in the depolarization of the ventricle it supplies. 
D)  leads to right axis deviation.

Question 5

In LBBB, the right ventricle is depolarized via the:

Accepted Answer

A)  right bundle branch. 
B)  ventricular apex. 
C)  right ventricle across the septum. 
D)  left posterior fascicle. 
A)  right bundle branch. 
B)  ventricular apex. 
C)  right ventricle across the septum. 
D)  left posterior fascicle.

Question 6

RBBB occurs with anterior wall MI, coronary artery disease, hypertension, scar tissue that develops after heart surgery, viral or bacterial infection of the heart muscle, and pulmonary embolism. It may also be caused by drug toxicity.

Accepted Answer

A) True 
 B)False

Question 7

LBBB occurs when conduction through the:

Accepted Answer

A)  left bundle branch is blocked, cause depolarization of the left ventricle to be delayed. 
B)  right bundle branch is blocked, cause depolarization of the left ventricle to be delayed. 
C)  right bundle branch is blocked, cause depolarization of the right ventricle to be delayed. 
D)  left posterior fascicle is blocked, cause depolarization of the right ventricle to be delayed. 
A)  left bundle branch is blocked, cause depolarization of the left ventricle to be delayed. 
B)  right bundle branch is blocked, cause depolarization of the left ventricle to be delayed. 
C)  right bundle branch is blocked, cause depolarization of the right ventricle to be delayed. 
D)  left posterior fascicle is blocked, cause depolarization of the right ventricle to be delayed.

Question 8

Indicators of incomplete bundle branch block include:

Accepted Answer

A)  reciprocal late broad S waves in I, aVL , V5, and V6 
B)  tall, wide, slurred R waves in I, aVL,V5, and V6 
C)  QRS complexes having a similar appearance to bundle branch block but are no greater than 0.11 seconds in duration. 
D)  ST segment depression and T-wave depression. 
A)  reciprocal late broad S waves in I, aVL , V5, and V6 
B)  tall, wide, slurred R waves in I, aVL,V5, and V6 
C)  QRS complexes having a similar appearance to bundle branch block but are no greater than 0.11 seconds in duration. 
D)  ST segment depression and T-wave depression.

Question 9

Bundle branch block is diagnosed by first analyzing the width of the QRS complexes.

Accepted Answer

A) True 
 B)False

Question 10

The R' is referred to as ________ and represents delayed depolarization of the blocked ventricle.

Accepted Answer

A)  R prime 
B)  rabbit ears 
C)  M shaped 
D)  delta wave 
A)  R prime 
B)  rabbit ears 
C)  M shaped 
D)  delta wave

Question 11

Left anterior hemiblock results in right axis deviation.

Accepted Answer

A) True 
 B)False

Question 12

One indicator of RBBB is an R, R' in leads:

Accepted Answer

A)  V1 or V2. 
B)  V5 or V6. 
C)  V2 or V3. 
D)  V4 or V5. 
A)  V1 or V2. 
B)  V5 or V6. 
C)  V2 or V3. 
D)  V4 or V5.

Question 13

Incomplete bundle branch block occurs when:

Accepted Answer

A)  one of the fascicles is blocked. 
B)  both bundle branches are blocked. 
C)  heart beat ceases. 
D)  the bundle branch conducts the impulse more slowly but it is not totally blocked. 
A)  one of the fascicles is blocked. 
B)  both bundle branches are blocked. 
C)  heart beat ceases. 
D)  the bundle branch conducts the impulse more slowly but it is not totally blocked.

Question 14

Activation of the septum produces:

Accepted Answer

A)  small R waves in leads V1 and V2 
B)  large Q waves in V1 andV2 
C)  small Q waves in leads V5 and V6 
D)  a and c 
A)  small R waves in leads V1 and V2 
B)  large Q waves in V1 andV2 
C)  small Q waves in leads V5 and V6 
D)  a and c

Question 15

As the impulse moves through the left ventricle it produces:

Accepted Answer

A)  small S waves is leads V1 and V2 
B)  large Q waves in V1 andV2 
C)  tall R waves is leads V5 and V6 
D)  All of these 
A)  small S waves is leads V1 and V2 
B)  large Q waves in V1 andV2 
C)  tall R waves is leads V5 and V6 
D)  All of these

Question 16

The most telling sign of bundle branch block is

Accepted Answer

A)  a wide QRS complex, at least 0.12 seconds or more in duration. 
B)  notching of the QRS complexes. 
C)  more P waves than QRS complexes. 
D)  T waves that take an opposite direction to the R waves. 
A)  a wide QRS complex, at least 0.12 seconds or more in duration. 
B)  notching of the QRS complexes. 
C)  more P waves than QRS complexes. 
D)  T waves that take an opposite direction to the R waves.

Question 17

Bundle branch block occurs only in:

Accepted Answer

A)  ventricular rhythms 
B)  supraventricular rhythms 
C)  AV heart block 
D)  Atrial rhythms 
A)  ventricular rhythms 
B)  supraventricular rhythms 
C)  AV heart block 
D)  Atrial rhythms

Question 18

LBBB usually indicates underlying cardiac pathology.

Accepted Answer

A) True 
 B)False

Question 19

Bifascicular block is a conduction disturbance in which two of the three main fascicles of the His/Purkinje system are blocked.

Accepted Answer

A) True 
 B)False

Question 20

Hemiblocks cause:

Accepted Answer

A)  axis deviation. 
B)  wide, notched QRS complexes. 
C)  biphasic QRS complexes in V1 and V2 
D)  very short R waves with much larger S waves in leads V5 and V6 
A)  axis deviation. 
B)  wide, notched QRS complexes. 
C)  biphasic QRS complexes in V1 and V2 
D)  very short R waves with much larger S waves in leads V5 and V6

Exam 19: Bundle Branch Block

Possible sites of bundle branch block include:

Repolarization abnormalities are uncommon in RBBB and LBBB.

Another indicator of RBBB is/are:

Bundle branch block:

In LBBB, the right ventricle is depolarized via the:

RBBB occurs with anterior wall MI, coronary artery disease, hypertension, scar tissue that develops after heart surgery, viral or bacterial infection of the heart muscle, and pulmonary embolism. It may also be caused by drug toxicity.

LBBB occurs when conduction through the:

Indicators of incomplete bundle branch block include:

Bundle branch block is diagnosed by first analyzing the width of the QRS complexes.

The R' is referred to as ________ and represents delayed depolarization of the blocked ventricle.

Left anterior hemiblock results in right axis deviation.

One indicator of RBBB is an R, R' in leads:

Incomplete bundle branch block occurs when:

Activation of the septum produces:

As the impulse moves through the left ventricle it produces:

The most telling sign of bundle branch block is

Bundle branch block occurs only in:

LBBB usually indicates underlying cardiac pathology.

Bifascicular block is a conduction disturbance in which two of the three main fascicles of the His/Purkinje system are blocked.

Hemiblocks cause:

Anatomy and Electrophysiology of the Heart

The Electrocardiogram

Analyzing the Electrocardiogram

Heart Rate

Regularity

P-Waves

QRS Complexes

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

Myocardial Ischemia and Infarction

Other Cardiac Conditions and the ECG

Putting It All Together

Filters