https://doctor.ndtv.com/faq/what-are-asd-closure-devices-1573
What are ASD closure devices?
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https://my.clevelandclinic.org/health/treatments/16838-cardiac-implant-closure-devices-in-adults
Cardiac Closure Devices for ASD & PFO
An ASD closure device fixes an opening between your upper heart chambers (atria). This treats atrial septal defects (ASD) and patent foramen ovale (PFO).
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