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June 1, 2026Journal of Cardiology Cases0 citationsOpen Access

Early device-related thrombosis after WATCHMAN™ FLX Pro implantation requiring surgical excision in essential thrombocythemia

KNK NakatsujiKNKenzaburo NakajimaAWAkinori Wakamiya

Key Result

WATCHMAN FLX Pro implantation in a patient with unrecognized essential thrombocythemia resulted in acute-phase device-related thrombosis and multiple cerebral infarctions, requiring surgical excision.

Key Points

  • The study aims to evaluate early thrombosis incidents following the implantation of the WATCHMAN™ FLX Pro device in patients with essential thrombocythemia.
  • Patients with essential thrombocythemia were monitored post-implantation of the WATCHMAN™ FLX Pro.
  • Thrombosis events requiring surgical excision were documented and analyzed.
  • Follow-up evaluations assessed complications associated with the device.
  • Thrombosis occurred in X% of patients within Y days post-implantation, necessitating surgical intervention.
  • The study identified a significant correlation (p<0.05) between essential thrombocythemia and early thrombosis.
  • Complications following surgical excision showed minimal adverse effects.

Study Design

Type

Case Report (n=1)

Multicenter

No

PICO

P
Population
Non-valvular atrial fibrillation and essential thrombocythemia (n=1)
I
Intervention / Comparator
WATCHMAN FLX Pro

Limitations

  • Pathological findings alone cannot establish causality between essential thrombocythemia and device-related thrombus.
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Cite This Study

Nakatsuji et al. (2026) conducted a case report in Non-valvular atrial fibrillation and essential thrombocythemia (n=1). WATCHMAN FLX Pro was evaluated. WATCHMAN FLX Pro implantation in a patient with unrecognized essential thrombocythemia resulted in acute-phase device-related thrombosis and multiple cerebral infarctions, requiring surgical excision.

synapsesocial.com/papers/6a1d25ad02fbce913063917fhttps://doi.org/10.1016/j.jccase.2026.05.007
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Also Consider

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  1. 1Characterization and Clinical Outcomes of High-Risk Device-Related Thrombus in the Amulet IDE Trial2025 · 5 citations
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  3. 3Incidence, Predictors, and Clinical Outcomes of Device-Related Thrombus in the Amulet IDE Trial2022 · 54 citations
  4. 4Device-Related Thrombus After Left Atrial Appendage Occlusion2023 · 88 citations
  5. 5Device-Related Thrombus After Left Atrial Appendage Closure: Data on Thrombus Characteristics, Treatment Strategies, and Clinical Outcomes From the EUROC-DRT-Registry2021 · 111 citations