AF Treatment Options 3 — Questions and Answers
Question 1: What is the minimum recommended duration of anticoagulation after successful electrical cardioversion in a patient with AF of unknown duration?
- 2 weeks
- 4 weeks (Correct answer)
- 6 weeks
- 12 weeks
Correct answer: 4 weeks
Current guidelines recommend at least 4 weeks of therapeutic anticoagulation after cardioversion regardless of AF duration due to post-cardioversion atrial stunning.
Question 2: Which oral anticoagulant requires twice-daily dosing and has a specific reversal agent called idarucizumab?
- Apixaban
- Rivaroxaban
- Dabigatran (Correct answer)
- Edoxaban
Correct answer: Dabigatran
Dabigatran is a direct thrombin inhibitor dosed twice daily, and idarucizumab (Praxbind) is its specific reversal agent approved for urgent reversal.
Question 3: Left atrial appendage occlusion devices (e.g., Watchman) are primarily indicated in AF patients who have:
- Persistent AF refractory to ablation
- High stroke risk but contraindication to long-term anticoagulation (Correct answer)
- Low CHAâ‚‚DSâ‚‚-VASc score with poor drug adherence
- Paroxysmal AF with normal left ventricular function
Correct answer: High stroke risk but contraindication to long-term anticoagulation
LAA occlusion is indicated in AF patients with elevated stroke risk who cannot tolerate long-term anticoagulation due to bleeding risk or other contraindications.
Question 4: Which class of antiarrhythmic drugs blocks sodium channels (class IC) and is used exclusively for rhythm control in patients without structural heart disease?
- Amiodarone and dronedarone
- Flecainide and propafenone (Correct answer)
- Sotalol and dofetilide
- Ibutilide and vernakalant
Correct answer: Flecainide and propafenone
Flecainide and propafenone are class IC sodium channel blockers safe only in structurally normal hearts; they are first-line rhythm control options in appropriate patients.
Question 5: A 'pill-in-the-pocket' approach to AF treatment involves the patient self-administering which drug upon symptom onset?
- Warfarin
- Flecainide or propafenone (Correct answer)
- Amiodarone
- Metoprolol or diltiazem
Correct answer: Flecainide or propafenone
The pill-in-the-pocket strategy uses a single oral dose of flecainide or propafenone taken at AF onset by selected low-risk patients to terminate paroxysmal episodes.
Question 6: Which factor does NOT increase the CHAâ‚‚DSâ‚‚-VASc score, which guides anticoagulation decisions in AF?
- Hypertension
- Obesity (Correct answer)
- Diabetes mellitus
- History of stroke or TIA
Correct answer: Obesity
Obesity is not a component of the CHA₂DS₂-VASc score; the score includes Congestive heart failure, Hypertension, Age ≥75, Diabetes, Stroke/TIA, Vascular disease, Age 65–74, and Sex category (female).
Question 7: AV node ablation combined with pacemaker implantation in AF patients is considered a palliative strategy primarily because:
- It eliminates the need for anticoagulation
- It restores sinus rhythm permanently
- It controls rate but AF continues requiring anticoagulation (Correct answer)
- It reverses structural remodeling of the atria
Correct answer: It controls rate but AF continues requiring anticoagulation
AV node ablation controls ventricular rate but AF persists in the atria, so anticoagulation must be continued indefinitely to prevent thromboembolic events.
AF Treatment Options 3
What is the minimum recommended duration of anticoagulation after successful electrical cardioversion in a patient with AF of unknown duration?