Question 1

Hemiblocks cause:

Accepted Answer

Hemiblocks, which are partial blocks of the left bundle branch system, specifically affect the direction of the heart's electrical axis, leading to axis deviation.

Question 2

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

The answer of RBBB occurs with anterior wall MI, coronary...

Question 3

LBBB can be caused by anterior wall MI; hypertensive heart disease; aortic stenosis; degenerative changes of the conduction system; or thickened, stiffened, or weakened heart muscle (cardiomyopathy).

Accepted Answer

The answer of LBBB can be caused by anterior wall...

Question 4

Repolarization abnormalities are uncommon in RBBB and LBBB.

Accepted Answer

Repolarization abnormalities are common in Right Bundle Branch Block (RBBB) and Left Bundle Branch Block (LBBB) due to the altered sequence of ventricular depolarization which affects the repolarization process.

Question 5

Left anterior hemiblock results in right axis deviation.

Accepted Answer

Left anterior hemiblock typically results in left axis deviation, not right axis deviation.

Question 6

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

Accepted Answer

The answer of Bundle branch block is diagnosed by first...

Question 7

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

Accepted Answer

The answer of Bifascicular block is a conduction disturbance in...

Question 8

LBBB usually indicates underlying cardiac pathology.

Accepted Answer

The answer of LBBB usually indicates underlying cardiac pathology....

Quiz 19: Bundle Branch Block