Abstract
Purpose
Approximately 10–40% of strokes are cryptogenic (CS). Long-term electrocardiographic (ECG) monitoring has been recommended in these patients to search for atrial fibrillation (AF). An unresolved issue is whether ambulatory ECG (AECG) monitoring should be performed first, followed by an implantable loop recorder (ILR) if AECG monitoring is non-diagnostic, or whether long-term ECG monitoring should be initiated using ILRs from the onset. The purpose of this study was to assess, using an ILR, AF incidence in the first month after CS.
Methods
We enrolled consecutive CS patients referred for an ILR. All patients were monitored via in-hospital continuous telemetry from admission until the ILR (Medtronic [Minneapolis, MN] LINQ™) was implanted. The duration and overall burden of all AF episodes ≥ 2 min was determined.
Results
The cohort included 343 patients (68 ± 11 years, CHA2DS2-VASc 3.5 ± 1.7). The time between stroke and ILR was 3.7 ± 1.5 days. During the first 30 days, only 18 (5%) patients had AF. All episodes were paroxysmal, lasting from 2 min to 67 h and 24 min. The median AF burden was 0.85% (IQR 0.52, 10.75). During 1 year of follow-up, 67 (21%) patients had AF.
Conclusion
The likelihood of AF detection by an ILR in the first month post-CS is low. Thus, the diagnostic yield of 30 days of AECG monitoring is likely to be limited. These data suggest a rationale for proceeding directly to ILR implantation prior to hospital discharge in CS patients, as many have AF detected during longer follow-up.
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Abbreviations
- AECG:
-
Ambulatory electrocardiography
- AF:
-
Atrial fibrillation
- CI :
-
Confidence interval
- CS :
-
Cryptogenic stroke
- CT :
-
Computed tomography
- ECG :
-
Electrocardiogram
- ILR:
-
Implantable loop recorder
- IQR:
-
Interquartile range
- MCT:
-
Mobile cardiovascular telemetry
- MRI:
-
Magnetic resonance imaging
- MRA:
-
Magnetic resonance angiography
- PFO:
-
Patent foramen ovale
- TIA:
-
Transient ischemic attack
- TTE:
-
Transthoracic echocardiogram
- TEE:
-
Transesophageal echocardiogram
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The study was conducted following good clinical practice guidelines; the protocol was approved by our Institutional Review Board.
Conflict of interest
James Allred, MD, is a consultant to Medtronic. Amber Seiler, NPC, is a consultant to Medtronic. Advay Bhatt, MD, is a consultant to Abbott and Medtronic. Suneet Mittal, MD, is a consultant to Medtronic. All other authors declare that they have no conflicts of interest.
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Milstein, N.S., Musat, D.L., Allred, J. et al. Detection of atrial fibrillation using an implantable loop recorder following cryptogenic stroke: implications for post-stroke electrocardiographic monitoring. J Interv Card Electrophysiol 57, 141–147 (2020). https://doi.org/10.1007/s10840-019-00628-6
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DOI: https://doi.org/10.1007/s10840-019-00628-6