CRAT Bundle Branch Blocks and Fascicular Blocks 2

Question 1

In left bundle branch block, the septal Q waves normally seen in leads I, V5, and V6 are typically:

Accepted Answer

Absent or eliminated

Answer

Deeper and wider than normal

Answer

Present but inverted

Answer

Present but shorter in duration

Question 2

An ECG shows a QRS of 0.14 sec with broad notched R waves in I, aVL, V5–V6 and a broad QS in V1. What is the most likely diagnosis?

Accepted Answer

Left bundle branch block

Answer

Right bundle branch block

Answer

Wolff-Parkinson-White syndrome

Answer

Ventricular tachycardia

Question 3

The Sgarbossa criteria are used to identify acute MI in the presence of which ECG pattern?

Accepted Answer

Left bundle branch block

Answer

Right bundle branch block

Answer

Wolff-Parkinson-White pattern

Answer

Complete AV block

Question 4

In LBBB, T-wave deflections that are discordant (opposite direction) to the QRS complex are considered:

Accepted Answer

Normal secondary repolarization changes

Answer

Pathological, indicating acute ischemia

Answer

A sign of hyperkalemia

Answer

Indicative of pericarditis

Question 5

New-onset LBBB in a patient presenting with chest pain should be managed as which of the following until proven otherwise?

Accepted Answer

A STEMI equivalent requiring emergent reperfusion evaluation

Answer

A benign finding requiring no urgent intervention

Answer

A sign of stable coronary artery disease

Answer

An artifact requiring lead repositioning

Question 6

Which underlying condition is the MOST common cause of left bundle branch block?

Accepted Answer

Hypertensive heart disease or coronary artery disease

Answer

Wolff-Parkinson-White syndrome

Answer

Electrolyte imbalance

Answer

Acute pulmonary embolism

Question 7

A patient has a normal narrow QRS at 70 bpm but develops LBBB morphology when the rate increases to 110 bpm. This phenomenon is called:

Accepted Answer

Rate-dependent (tachycardia-dependent) LBBB

Answer

Intermittent LBBB

Answer

Wolff-Parkinson-White syndrome

Answer

Brugada pattern