Inclusion Criteria:  Man or woman over 18 years-old Patient with paroxysmal AF at high embolic risk (CHA2DS2Vasc score ≥ 4) and presenting a formal and definitive contraindication to anticoagulants Patient scheduled for percutaneous closure of the left auricle by St Jude AMULET device Patient in sinus rhythm Subject affiliated or beneficiary of a social security scheme Patient having signed the informed consent  Exclusion Criteria:  Patient participating in another clinical study Patient in permanent ACFA Patient with a mitral prosthesis (biological or mechanical), Patient with a history of mitral annuloplasty Protected patient: adult under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision; Pregnant, breastfeeding or parturient woman; Patient hospitalized without consent.