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Incidence and predictors of left atrial thrombus in patients with atrial fibrillation under anticoagulation therapy

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Abstract

Background

Left atrial thrombus (LAT) formation is associated with thromboembolic events.

Objective

To investigate the incidence and associated factors of LAT in patients with atrial fibrillation (AF) who had been receiving anticoagulation therapy for more than 4 weeks, and to develop a prediction model using clinical and echocardiographic features.

Methods

Medical records of 1,122 patients with AF (mean age, 59.4 ± 11.0 years, 58.3% male) who were on anticoagulation more than 4 weeks and underwent transesophageal echocardiography (TEE) were evaluated. The main outcome was the presence of LAT on TEE.

Results

Warfarin and non-vitamin K oral anticoagulants were used in 74.4% and 25.6% of the patients at the time of examination, respectively. LAT was present in 60 patients (5.3%). Presence of LAT on TEE was associated with age ≥ 75 years (odds ratio [OR] 2.13 [95% confidence interval, 0.94–4.58]), persistent/permanent AF (OR 2.61 [1.42–4.93]), CHA2DS2-VASc score ≥ 3 points (OR 1.91 [1.05–3.48]), left ventricular ejection fraction < 40% (OR 2.35 [1.07–4.81]), and severe left atrial enlargement (OR 3.52 [1.89–6.79]). The presence of moderate-to-severe mitral regurgitation was associated with a lower risk of LAT (OR 0.13 [0.04–0.34]). A scoring system composed of the aforementioned predictors showed excellent discrimination performance (area under the curve 0.791 [95% CI, 0.727–0.854]).

Conclusions

LAT was present in a considerable number of patients who were already receiving anticoagulation therapy. A prediction model that combines clinical and echocardiographic predictors could be useful in distinguishing patients who require imaging evaluations before left atrial intervention.

Graphical abstract

Incidnece and predictors of LAT in patients with AF under anticoagulation therapy. AF, atrial fibrillation; CVS, CHA2DS2-VASc score; LA, left atrium; LAA, left atrial appendage; LAE, left atrial enlargement; LVEF, left ventricular ejection fraction; MR, mitral regurgitation; OAC, oral anticoagulant; PeAF, persistent atrial fibrillation; TEE, transesophageal echocardiography

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Abbreviations

AF:

Atrial fibrillation

AUC:

Area under the curve

CI:

Confidence interval

INR:

International normalized ratio

IQR:

Interquartile range

MR:

Mitral regurgitation

LA:

Left atrium

LAA:

Left atrial appendage

LAE:

Left atrial enlargement

LAT:

Left atrial thrombus

NOAC:

Non-vitamin K oral anticoagulants

OR:

Odds ratio

PeAF:

Persistent atrial fibrillation

ROC:

Receiver operating characteristics

SD:

Standard deviation

TEE:

Transesophageal echocardiography

TTE:

Transthoracic echocardiography

VHD:

Valvular heart disease

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Acknowledgements

We thank all members of the Heart Institute at Asan Medical Center for their support for sample collection. All authors were involved in the drafting and review of the manuscript and approved the final version.

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The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

  1. Department of Cardiology, Heart Institute, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-Ro 43-Gil, Songpa-Gu, Seoul, 05505, Korea

    Joong Min Lee, Myung-Jin Cha, Gi-Byoung Nam, Kee-Joon Choi, Byung Joo Sun, Dae-Hee Kim, Jong-Min Song, Duk-Hyun Kang, Jae-Kwan Song & Min Soo Cho

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Lee, J.M., Cha, MJ., Nam, GB. et al. Incidence and predictors of left atrial thrombus in patients with atrial fibrillation under anticoagulation therapy. Clin Res Cardiol (2024). https://doi.org/10.1007/s00392-024-02422-5

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