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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 NakatsujiNational Cerebral and Cardiovascular CenterKNKenzaburo NakajimaNational Cerebral and Cardiovascular CenterAWAkinori WakamiyaNational Cerebral and Cardiovascular Center

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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