When to Refer for Catheter Ablation?
The new guidelines upgraded the recommendation for catheter ablation to class I (strong recommendation) for patients with symptomatic AF in whom anti-arrhythmic therapy is unsuccessful, not tolerated, or contraindicated; patients with symptomatic paroxysmal AF (typically younger patients with few comorbidities); and patients with symptomatic or clinically significant atrial flutter. The previous iteration recommended trying drug therapy first.
Multiple randomized clinical trials have demonstrated the effectiveness of catheter ablation.
“In somebody who is younger, with a healthy heart, the 1-year success rate of the procedure might be about 70%,” Joglar said. While 70% of patients receiving a catheter have no AF episodes in the following year, Joglar said 20%-25% of those who do have recurrences will experience fewer or shorter episodes.
Conversations about rate vs rhythm control and whether to pursue catheter ablation often come down to preference, Patel said. He would tend to intervene earlier using ablation in patients with heart failure or those experiencing symptoms of AF who cannot be controlled with a heart rate < 100 beats/min.
But he said he prefers using medication for rate control in many of his patients who are older, have chronic AF, and do not have heart failure.
Mandrola takes a more conservative approach, reserving catheter ablation for patients in whom risk factor management and anti-arrhythmic drugs have not been successful.
“In my hospital, it’s done for patients who have symptomatic AF that’s really impacting their quality of life,” he said. But for those with fewer symptoms, his advice is to provide education, reassurance, and time because AF can resolve on its own.
What About Data From Implantables and Wearables?
The guidelines provide an algorithm for when to treat non-symptomatic atrial high-rate episodes detected by a cardiovascular implantable electronic device such as a pacemaker or defibrillator. Episodes less than 5 minutes can be ignored, while treatment could be considered for those with episodes lasting 5 minutes up to 24 hours with a CHA2DS2-VASc score ≥ 3, or lasting longer than 24 hours with a CHA2DS2-VASc score ≥ 2.
But whether anticoagulation improves outcomes is unclear.
“That is a $64,000 question,” Mandrola said. “I would bet every day I get a notification in the electronic health record that says Mr. Smith had 2 hours of AFib 2 weeks ago.”
He also hears from patients who report their Apple Watch has detected an episode of AF.
Mandrola cited evidence from two recent studies of patients who had an atrial high-rate episode longer than 6 minutes detected by implantable devices. The NOAH-AFNET 6 trial randomized patients over 65 years with one or more risk factors for stroke to receive a DOAC or placebo, while the ARTESIA trial used similar inclusion criteria to assign patients to receive either DOAC or aspirin. Both studies reported modest reductions in stroke that were outweighed by a higher incidence of major bleeding in the group receiving anticoagulation.
Shared decision-making should play a role in deciding how aggressively to treat episodes of AF detected by implantable or wearable devices.
He said some patients fear having a stroke, while others are adamantly opposed to taking an anticoagulant.
For patients who present with a documented episode of AF but who otherwise have no symptoms, Patel said clinicians should consider risk for stroke and frequency and duration of episodes.
“One way clinicians should be thinking about it is, the more risk factors they have, the lower burden of AF I need to treat,” Patel said. Even for patients who are having only short episodes of AF, he has a low threshold for recommending an anticoagulation drug if the patient’s CHA2DS2-VASc score is high.
Patel reported research grants from Bayer, Novartis, Idorsia, NHLBI, and Janssen Pharmaceuticals and served as a consultant on the advisory boards of Bayer, Janssen Pharmaceuticals, and Esperion Therapeutics.
Joglar and Mandrola had no disclosures.
A version of this article appeared on Medscape.com.