A bundle branch block may develop after acute myocardial infarction, pulmonary embolism, or aortic stenosis and is due to a conduction delay in the right or left bundle branches. Which finding describes this condition?

A bundle branch block may develop after acute myocardial infarction, pulmonary embolism, or aortic stenosis and is due to a conduction delay in the right or left bundle branches. Which finding describes this condition?

• A. Bundle Branch Block
• B. Atrial Fibrillation
• C. Ventricular Tachycardia
• D. Long QT Syndrome

Answer: (A)

The finding is a conduction delay or block in one of the heart’s main pathways to the ventricles—the right or left bundle branch. When one bundle branch is blocked, ventricular activation becomes asynchronous, slowing depolarization of the affected ventricle and widening the QRS complex on ECG (usually over 120 ms). This pattern fits after events that can damage conduction tissue, such as acute myocardial infarction, pulmonary embolism, or aortic stenosis. Other options describe different problems: atrial fibrillation is irregular atrial activity with no discrete P waves, ventricular tachycardia is a rapid wide-complex rhythm, and Long QT syndrome is a prolonged QT interval. The described finding directly reflects a bundle branch conduction delay.

The finding is a conduction delay or block in one of the heart’s main pathways to the ventricles—the right or left bundle branch. When one bundle branch is blocked, ventricular activation becomes asynchronous, slowing depolarization of the affected ventricle and widening the QRS complex on ECG (usually over 120 ms). This pattern fits after events that can damage conduction tissue, such as acute myocardial infarction, pulmonary embolism, or aortic stenosis. Other options describe different problems: atrial fibrillation is irregular atrial activity with no discrete P waves, ventricular tachycardia is a rapid wide-complex rhythm, and Long QT syndrome is a prolonged QT interval. The described finding directly reflects a bundle branch conduction delay.