Thromboembolic events and need for anticoagulation therapy following left atrial appendage occlusion in patients with electrical isolation of the appendage

Varuna K. Gadiyaram, Sanghamitra Mohanty, Carola Gianni, Chintan Trivedi, Amin Al-Ahmad, David J. Burkhardt, Joseph G. Gallinghouse, Patrick M. Hranitzky, Rodney P. Horton, Javier E. Sanchez, Domenico G. Della Rocca, Luigi Di Biase, Matthew J. Price, Linda Couts, Douglas Gibson, Andrea Natale

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Introduction: Electrical isolation of the left atrial appendage (LAA) is an important adjunctive ablation strategy in patients with nonparoxysmal atrial fibrillation (AF). Patients who have impaired LAA contractility following isolation may require long-term oral anticoagulant (OAC) therapy irrespective of their CHADS2-VASc score. Percutaneous LAA occlusion (LAAO) is a potential alternative to life-long OAC therapy. We aimed to assess the rate of OAC discontinuation and thromboembolic (TE) events following percutaneous LAAO in patients who underwent LAA electrical isolation (LAAI). Methods: This is a retrospective two-center study of patients who underwent percutaneous LAAO following LAAI. Patients with at least 3-month follow-up were included in the study. The antithrombotic therapy and TE events at the time of the last follow-up were noted. Results: The LAA was successfully occluded in 162 (with Watchman device in 140 [86.4%] and Lariat in 22 [13.6%]). A total of 32 patients had leaks detected on the 45-day transesophageal echocardiogram (TEE); 21 (15%) Watchman and 11 (50%) Lariat cases (P = 0.0001). Two (one Watchman and one Lariat) of the 32 leaks were more than 5 mm. After the 45-day TEE, 150 (92.6%) patients were off-OAC. No TE events were reported in the 150 patients who stopped the anticoagulants. Four (2.47%) patients experienced stroke following the LAAO (three Watchman and one Lariat) procedure while on-OAC, two of which were fatal. At the median follow-up of 18.5 months, 159 (98.15%) patients were off-anticoagulant. Conclusion: Up to 98% of patients with LAAI could safely discontinue OAC after undergoing the appendage closure procedure.

Original languageEnglish (US)
Pages (from-to)511-516
Number of pages6
JournalJournal of cardiovascular electrophysiology
Issue number4
StatePublished - Apr 2019


  • left atrial appendage
  • left atrial appendage occlusion
  • oral anticoagulation
  • thromboembolic events

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)


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