The main objective is to demonstrate the equivalence, before and after the percutaneous closure of the left atrial procedure, of the maximum proto-diastolic velocity of the lateral mitral annulus (e 'lat) measured by tissue Doppler. Patients with AF at high embolic risk and presenting a formal and definitive contraindication to anticoagulants having been operated on for percutaneous closure of the left atrial by St Jude AMULET device, considering an equivalence margin of 1 cm / sec.

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.