ACLS Bradycardia 3

Question 1

Which of the following ECG findings defines a second-degree AV block Mobitz type II?

Accepted Answer

Constant PR interval with sudden non-conducted P waves

Answer

Mobitz type II is characterized by a constant PR interval with unexpected dropped QRS complexes.

Question 2

Why is Mobitz type II second-degree AV block considered more dangerous than Mobitz type I?

Accepted Answer

It frequently progresses to complete heart block

Answer

Mobitz type II carries a high risk of sudden progression to complete (third-degree) AV block.

Question 3

A patient on beta-blockers develops symptomatic sinus bradycardia. After atropine fails, which infusion is a reasonable ACLS alternative to transcutaneous pacing?

Accepted Answer

Epinephrine 2–10 mcg/min

Answer

Epinephrine infusion at 2–10 mcg/min is an ACLS-recommended vasopressor/chronotropic alternative when pacing is unavailable or atropine fails.

Question 4

On a rhythm strip, there is no consistent relationship between P waves and QRS complexes; P-P intervals are regular and R-R intervals are regular but different from each other. What is this rhythm?

Accepted Answer

Third-degree (complete) AV block

Answer

Complete (third-degree) AV block shows independent atrial and ventricular rhythms with no relationship between P waves and QRS complexes.

Question 5

Which of the following is a REVERSIBLE cause of bradycardia that the ACLS provider should search for using the 'H's and T's' framework?

Accepted Answer

Hyperkalemia

Answer

Hyperkalemia can cause severe bradycardia and AV block and is a reversible H that must be identified and treated.

ACLS Practice Test

ACLS Practice Test

ACLS Bradycardia 3