AF Patient Management 3 — Questions and Answers
Question 1: A patient with persistent AF has failed two antiarrhythmic drugs. What is the next recommended intervention according to current guidelines?
- Add a second antiarrhythmic drug simultaneously
- Catheter ablation targeting pulmonary vein isolation (Correct answer)
- Permanent pacemaker implantation
- Increase the dose of the failed antiarrhythmic
Correct answer: Catheter ablation targeting pulmonary vein isolation
Catheter ablation with pulmonary vein isolation is recommended when AF persists despite at least one antiarrhythmic drug failure.
Question 2: Which of the following is the most common identifiable trigger of AF?
- Hypertension (Correct answer)
- Heavy alcohol consumption ('holiday heart')
- Hyperthyroidism
- Pulmonary embolism
Correct answer: Hypertension
Hypertension is the most prevalent modifiable risk factor and trigger for AF in the general population.
Question 3: A 65-year-old patient with AF and hypertension asks about stopping anticoagulation because they feel fine. What is the best response?
- Agree, as symptoms predict stroke risk
- Agree if the AF is paroxysmal rather than persistent
- Explain that AF-related strokes can occur without symptoms and anticoagulation must continue (Correct answer)
- Suggest aspirin as an acceptable substitute
Correct answer: Explain that AF-related strokes can occur without symptoms and anticoagulation must continue
AF can be asymptomatic, yet still confers significant stroke risk; guidelines do not support stopping anticoagulation based on symptom status.
Question 4: Which rate control target is generally recommended for most stable AF patients?
- Resting HR < 60 bpm
- Resting HR < 80 bpm
- Resting HR < 100 bpm
- Resting HR < 110 bpm (Correct answer)
Correct answer: Resting HR < 110 bpm
The RACE II trial demonstrated that a lenient rate control target of resting HR < 110 bpm is acceptable and not inferior to strict control in stable patients.
Question 5: What is the primary mechanism by which pulmonary vein isolation (PVI) treats AF?
- Slowing of the AV node conduction
- Elimination of ectopic triggers that initiate AF from the pulmonary veins (Correct answer)
- Creating a maze pattern of scar in the left atrium
- Interrupting the bundle of His
Correct answer: Elimination of ectopic triggers that initiate AF from the pulmonary veins
PVI electrically disconnects pulmonary veins — the predominant source of AF-initiating ectopic beats — from the left atrium.
Question 6: A patient with AF and end-stage renal disease (eGFR < 15) requires anticoagulation. Which agent requires the most caution or dose adjustment?
- Warfarin
- Apixaban
- Dabigatran (Correct answer)
- Rivaroxaban
Correct answer: Dabigatran
Dabigatran is 80% renally eliminated and is contraindicated in severe renal impairment (CrCl < 15–30 mL/min), making it the highest risk agent in this setting.
Question 7: During an AF patient's follow-up visit, you find an INR of 1.5 on warfarin. What is the most appropriate action?
- Switch immediately to a DOAC
- Increase the warfarin dose and recheck INR in 1–2 weeks (Correct answer)
- Add bridging heparin until therapeutic INR is achieved
- Discontinue warfarin for 3 days then restart
Correct answer: Increase the warfarin dose and recheck INR in 1–2 weeks
A subtherapeutic INR indicates underdosing; the appropriate response is to increase the dose and recheck within 1–2 weeks.
AF Patient Management 3
A patient with persistent AF has failed two antiarrhythmic drugs.
What is the next recommended intervention according to current guidelines?