Key result
Eight-second ExTRa Mapping recordings yield ~16% lower AF driver instability than 5-second recordings.
Why the study?
ExTRa Mapping was developed to visualize rotational activation as AF drivers, but the instability of these AF drivers required evaluation.
Population
26 persistent AF patients
Comparison
Repetitive recordings before vs after PVI (and 5 s vs 8 s recording times)
Design
Observational cohort study
Authors
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Instability of rotational AF drivers on ExTRa Mapping warrants caution with short recordings; leaves open optimal duration for reliable assessment.
Observational (n=26)
Absolute Event Rate: 50.6% vs 60.4%
p-value: p=0.004
Rotational activation assessed by ExTRa Mapping is unstable, requiring repetitive and longer recordings (e.g., 8 seconds) for reliable assessment.
Kawaji et al. (2022) conducted an observational in Persistent atrial fibrillation (n=26). ExTRa Mapping™ (8-second recordings) vs. ExTRa Mapping™ (5-second recordings) was evaluated on Instability index of nonpassively activated ratio (%NP) (p=0.004). Rotational activation as atrial fibrillation drivers assessed by ExTRa Mapping™ showed significant instability, which was lower with 8-second versus 5-second recordings (50.6% vs 60.4%, P=0.004).
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