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NCT05324371

WATCHMAN FLX™ CT Study

Completed NA Results posted Last updated 1 July 2025
What this trial tests

NA trial testing Watchman FLX Device in The Focus of the Study is to Reduce the Risk of Stroke and Life-threatening Bleeding Events in Patients With Non-valvular Atrial Fibrillation in 25 participants. Completed in 23 January 2025.

Timeline
9 November 2022
Primary endpoint
30 May 2024
23 January 2025

Quick facts

Lead sponsorBoston Scientific Corporation
PhaseNA
StatusCompleted
Study typeINTERVENTIONAL
Allocationna
Designsingle group
Maskingnone
Primary purposetreatment
Enrollment25
Start date9 November 2022
Primary completion30 May 2024
Estimated completion23 January 2025
Sites1 location across Denmark

Drugs / interventions tested

Conditions studied

Sponsor

Boston Scientific Corporation — full company profile →

Who can join

18 and older, any sex, with The Focus of the Study is to Reduce the Risk of Stroke and Life-threatening Bleeding Events in Patients With Non-valvular Atrial Fibrillation. Patients with the condition only — healthy volunteers not accepted.

Results — posted to ClinicalTrials.gov

Per-arm endpoint measurements with 95% confidence intervals where reported. Source: trial results section.

Number of Participants With Any Hypoattenuated Thickening (HAT) on the Surface of the Device Primary · 14 days to 3 months post implant

Serial measurement of any HAT on the surface of the device at 14 days, 45 days and 3 months post implant as assessed by core lab using CT imaging

GroupValue95% CI
14 Days5
45 Days3
3 Months2

Adverse events — posted to ClinicalTrials.gov

Time frame: 1 Year. Reporting threshold: 0%. Adverse-event reports describe events observed during the trial — not all are caused by the drug.

Device Arm
Serious: 10/25 (40%)
Deaths: 1/25

Serious adverse events (16 terms)

ReactionSystemDevice Arm
PneumoniaInfections and infestations
Cerebral HaemorrhageNervous system disorders
Aortic Valve IncompetenceCardiac disorders
Atrial FibrillationCardiac disorders
Gastric UlcerGastrointestinal disorders
Gastric Ulcer HaemorrhageGastrointestinal disorders
UrosepsisInfections and infestations
FallInjury, poisoning and procedural complications
Graft HaemorrhageInjury, poisoning and procedural complications
Subdural HaematomaInjury, poisoning and procedural complications
OsteoarthritisMusculoskeletal and connective tissue disorders
Metastases to LiverNeoplasms benign, malignant and unspecified (incl cysts and polyps)
Thyroid NeoplasmNeoplasms benign, malignant and unspecified (incl cysts and polyps)
Renal FailureRenal and urinary disorders
Respiratory FailureRespiratory, thoracic and mediastinal disorders
DeathGeneral disorders
Other adverse events (3 terms — click to expand)

ReactionSystemDevice Arm
Device Related ThrombosisGeneral disorders
Catheter Site HaemorrhageGeneral disorders
SedationNervous system disorders

Most-reported serious reactions: Pneumonia, Cerebral Haemorrhage, Aortic Valve Incompetence, Atrial Fibrillation, Gastric Ulcer, Gastric Ulcer Haemorrhage, Urosepsis, Fall.

Data from ClinicalTrials.gov NCT05324371 adverse events section.

Sponsor's own description

WATCHMAN FLX™ CT is a prospective, single-arm, single-center, post-market investigation to assess device tissue coverage in subjects with non-valvular atrial fibrillation (AF) who receive the WATCHMAN FLX device to reduce the risk of stroke. Serial advanced imaging modalities such as CT and TEE will be used.

Publications & conference data

1 peer-reviewed publication reference this trial (live from Europe PMC):

  1. The ABC of sealing following left atrial appendage closure.
    Hamadanchi A, Eskildsen VK, Johnsen J, Frederiksen CA, et al · · 2026 · PMID 41973211 · DOI 10.1007/s00392-026-02895-6

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Other Boston Scientific Corporation trials

Trials by the same sponsor.

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Data sources for this page

Drug Landscape aggregates and links these public records for informational use only. Always verify against the primary source before clinical or regulatory decisions. Canonical URL: https://druglandscape.com/trial/NCT05324371.

Primary sources · FDA · ClinicalTrials.gov · EMA · SEC EDGAR · ChEMBL · Wikidata · full sourcing