Can the Watchman left atrial appendage closure device be visualized on imaging?

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Last updated: September 30, 2026 • View editorial policy

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Can the Watchman Device Be Visualized on Imaging?

Yes, the Watchman left atrial appendage closure device can be readily visualized on multiple imaging modalities including transesophageal echocardiography (TEE), cardiac CT, intracardiac echocardiography (ICE), and cardiac MRI.

Primary Imaging Modalities

Transesophageal Echocardiography (TEE)

TEE is the most frequently used imaging tool for visualizing the Watchman device both during implantation and follow-up 1. The device appears as an echogenic structure at the LAA ostium, with the fabric membrane and frame clearly visible. The 2025 EACVI/EHRA consensus statement shows that LAA closure devices including Watchman can be seen in both 2D sagittal and 3D en face views 1.

Cardiac CT

Cardiac CT provides excellent visualization of the Watchman device with high spatial resolution 1, 2. CT is particularly valuable because:

  • It accurately shows device position and protrusion into the left atrium
  • It can detect device-related complications including thrombus formation
  • The newer Watchman FLX Pro incorporates radiopaque platinum markers at the device shoulders, further enhancing CT visibility 3
  • CT measurements are slightly larger than TEE due to higher spatial resolution 2

Intracardiac Echocardiography (ICE)

ICE can visualize the Watchman device during implantation without requiring general anesthesia 4. The device is clearly seen from the left atrium using ICE guidance, allowing for real-time assessment of deployment and positioning.

Cardiac MRI

Cardiac MRI can visualize the Watchman device, though it is less commonly used than TEE or CT 3. Specific T1-weighted sequences can differentiate device-related tissue ingrowth from thrombus formation on the device surface.

Key Imaging Features

The Watchman device has several features that enhance its visibility:

  • Radiopaque markers: The Watchman FLX Pro has platinum markers at the shoulders that facilitate optimal deployment assessment and evaluation of device stability 3
  • Fabric membrane: Visible on all modalities as a smooth surface
  • Metal frame: Creates characteristic imaging appearance on fluoroscopy, CT, and echocardiography

Clinical Pitfalls

Do not confuse pectinate muscles with device-related thrombus on TEE - this is a common false-positive finding 1. When uncertainty exists, contrast-enhanced CMR or delayed-phase cardiac CT (sensitivity 100%, specificity 99%) should be used to differentiate thrombus from normal structures 2.

The device can show hypoattenuated thickening on its surface during follow-up imaging, which may represent tissue ingrowth rather than thrombus - advanced imaging protocols including specific MRI sequences can help make this distinction 3.

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.