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Bradycardia Flashcards

7 cards from real ACLS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Bradycardia flashcards as text

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

    Answer: Constant PR interval with sudden non-conducted P waves

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

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

    Answer: It frequently progresses to complete heart block

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

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

    Answer: Epinephrine 2–10 mcg/min

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

  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?

    Answer: Third-degree (complete) AV block

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

  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?

    Answer: Hyperkalemia

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

  6. A patient has a heart rate of 44 bpm with a BP of 80/50 mmHg. Atropine 1 mg IV is given with no improvement. Transcutaneous pacing is initiated but the patient remains hemodynamically unstable despite capture. What is the next step?

    Answer: Arrange transvenous pacing

    Transvenous pacing provides more reliable and definitive pacing for patients who remain unstable despite transcutaneous pacing.

  7. Which medication used for acute coronary syndrome can cause symptomatic bradycardia and may need to be addressed in ACLS management?

    Answer: Beta-blockers

    Beta-blockers reduce heart rate and AV conduction and can precipitate symptomatic bradycardia, particularly in patients with underlying conduction disease.