Targeted Anticoagulation for Atrial Fibrillation Guided by Continuous Rhythm Assessment With an Insertable Cardiac Monitor: The Rhythm Evaluation for Anticoagulation With Continuous Monitoring (REACT.COM) Pilot Study.
BACKGROUND
Chronic anticoagulation is recommended for patients with AF and additional stroke risk factors, even during long periods of sinus rhythm. Continuous rhythm assessment with an insertable cardiac monitor (ICM) and use of rapid onset novel oral anticoagulants (NOACs) allow for targeted anticoagulation only around an AF episode, potentially reducing bleeding complications without compromising stroke risk.


METHODS
This multicenter, single-arm study enrolled patients on NOAC with nonpermanent AF and CHADS2 score 1 or 2. After a 60-day run-in with no AF episodes ≥ 1 hour, NOACs were discontinued but reinitiated for 30 days following any AF episode ≥ 1 hour diagnosed through daily ICM transmissions. Major endpoints included time on NOAC, stroke, and bleeding.


RESULTS
Among 59 enrollees, 75% were male, age 67 ± 8 years, 76% paroxysmal AF, 69% had prior AF ablation, and mean CHADS2 score 1.3 ± 0.5. Over 466 ± 131 mean days of follow-up there were 24,004 ICM transmissions with a compliance rate of 98.7%. A total of 35 AF episodes ≥ 1 hour occurred in 18 (31%) patients, resulting in a total time on NOAC of 1,472 days. This represents a 94% reduction in the time on NOAC compared to chronic anticoagulation. There were three traumatic bleeds (all on aspirin), three potential transient ischemic attacks (all on aspirin with CHADS2 score of 1), and no strokes or deaths.


CONCLUSIONS
A targeted strategy of ICM-guided intermittent NOAC administration is feasible. A large-scale trial is necessary to evaluate the safety of this approach.
Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
Rod
R
Passman
University of Western Ontario, London, Canada.
Peter
P
Leong-Sit
Northwestern Memorial Hospital, Chicago, Illinois, USA.
Adin-Cristian
AC
Andrei
Northwestern Memorial Hospital, Chicago, Illinois, USA.
Anna
A
Huskin
Northwestern Memorial Hospital, Chicago, Illinois, USA.
Todd T
TT
Tomson
Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
Richard
R
Bernstein
Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
Ethan
E
Ellis
Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
Jonathan W
JW
Waks
Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
Peter
P
Zimetbaum
D000284:Administration, Oral; D000368:Aged; D000925:Anticoagulants / Q000008:administration & dosage*; D001281:Atrial Fibrillation / Q000175:diagnosis / Q000188:drug therapy* / Q000503:physiopathology*; D016503:Drug Delivery Systems / Q000379:methods*; D015716:Electrocardiography, Ambulatory / Q000379:methods*; D004567:Electrodes, Implanted; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D011446:Prospective Studies
D000925:Anticoagulants
REVEAL; TIA; anticoagulation; atrial fibrillation; implantable cardiac monitor; stroke