Asked by rabin barakat on May 11, 2024
Verified
Of the types of damage resulting from a myocardial infarction, which is most likely to cause the greatest increase in the Q-T interval?
A) Infarction in the AV node
B) Left bundle branch block
C) Infarction affecting the SA node
D) Tachycardia
E) Ectopic focus
Myocardial Infarction
A medical condition also known as a heart attack, caused by the interruption of blood flow to the heart muscle.
Q-T Interval
The period on an electrocardiogram (ECG) that represents the time between the start of the Q wave and the end of the T wave, reflecting the time it takes for the ventricles to depolarize and repolarize.
AV Node
The atrioventricular node, a part of the electrical conduction system of the heart that delays the signal before it passes to the ventricles.
- Examine the impacts of ion channel operation on cardiac pace and cadence.
Verified Answer
AA
Angellina AcostaMay 17, 2024
Final Answer :
B
Explanation :
Left bundle branch block (LBBB) can significantly prolong the Q-T interval because it delays the depolarization and repolarization of the left ventricle, which is a major component of the Q-T interval on the ECG. This delay in electrical activity can lead to a noticeable increase in the Q-T interval duration.
Learning Objectives
- Examine the impacts of ion channel operation on cardiac pace and cadence.