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An Observational Study: Clinical Manifestations and Prognosis of Left Atrial Thrombosis in Atrial Fibrillation

Qian Yang1, Shuang Liu2, Jiang Wang3

  • 1Department of Cardiology, Fuwai Yunnan Cardiovascular Hospital, Kunming, China.

SN Comprehensive Clinical Medicine
|June 12, 2023
PubMed

Insights

Left atrial thrombosis in atrial fibrillation patients poses a high risk for systemic thromboembolism. While anticoagulation can resolve thrombi, standard doses may not be sufficient for complete depletion, especially in valvular atrial fibrillation.

Area of Science:

  • Cardiology
  • Thrombosis Research
  • Atrial Fibrillation Management

Background:

  • Left atrial thrombosis (LAT) is a significant complication of atrial fibrillation (AF).
  • Understanding the clinical manifestations and prognosis of LAT across different AF types is crucial for optimizing treatment strategies.
  • The relationship between LAT and systemic thromboembolism (SE) requires further investigation.

Purpose of the Study:

  • To investigate the clinical features and prognosis of left atrial thrombosis in patients with various types of atrial fibrillation.
  • To explore the association between left atrial thrombosis and systemic thromboembolism.
  • To evaluate the effectiveness of different anticoagulation therapies in managing left atrial thrombosis.

Main Methods:

  • A retrospective, single-center study involving 103 patients diagnosed with atrial fibrillation and left atrial thrombosis.
  • Data collection included general clinical information, anticoagulation regimens, thromboembolic events, and thrombosis outcomes.
  • Statistical analysis was performed to compare outcomes between different patient groups and treatment strategies.

Main Results:

  • Thrombosis outside the left atrial appendage (LAA) was significantly more common in valvular atrial fibrillation (VAF) compared to non-valvular AF (NVAF) (p=0.003).
  • The overall prevalence of systemic thromboembolism was 33.0%.
  • Anticoagulation treatment led to thrombus resolution in 75.7% of patients within two years. No significant differences in thromboembolic events or thrombosis prognosis were observed between warfarin, dabigatran, and rivaroxaban in NVAF patients (p=0.740 and p=0.493, respectively).

Conclusions:

  • Atrial fibrillation patients with left atrial thrombosis face a high risk of systemic thromboembolism.
  • Valvular AF is associated with a higher incidence of thrombosis outside the LAA compared to NVAF.
  • Current standard-dose anticoagulants may not be fully effective in eliminating all left atrial thrombi, indicating a need for potentially adjusted therapeutic approaches.

Keywords:
AnticoagulationAtrial fibrillationLeft atrial thrombosisSystemic thromboembolism

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