Diagnostic Efficacy of Connected WAtch ECG Versus External Holter ECG

Inclusion Criteria:

* Any patient consulting for the main reason of palpitations; without a previous diagnosis of arrhythmia, unless the current symptomatology appears different from that associated with the previous rythmological diagnosis;
* Palpitations requiring cardiological consultation or emergency hospital treatment;
* Absence of suggestive diagnosis on intercritical 12-lead ECG (pre-excitation, AVB M2/3, high-grade atrioventricular block, non-sustained tachyventricular, atrial fibrillation with heart rate; 110 per minute, atrial tachycardia or flutter);
* Non-contributory stress test (no electrical abnormality, occurrence of arrhythmia or reproduction of palpitations) if isymptoms occur during exercise;
* Accepts to wear the watch all the time outside the charging time;
* Using a personal smartphone or tablet compatible with the Health Mate application and with an Internet connection;
* Affiliated with a social security system ;
* Providing dated and signed an informed consent form.

Exclusion Criteria:

* Refusal to wear the connected watch;
* Refusal to use the watch provided for the study because they use a personal connected watch;
* Unable to use the connected watch (lack of understanding of its use and rationale);
* No smartphone;
* Wearer of an implantable device (PM, ICD);
* Already known and treated arrhythmia with identical symptoms;
* Heart disease with indication for primary/secondary prevention implantable device;
* Associated syncope;
* Obvious extra-cardiac cause;
* Pregnant or breast-feeding woman;
* Inability to undergo study follow-up for geographical, linguistic, social or psychological reasons;
* Participating in another clinical study which can interfere with this study
* Patient under guardianship or deprived of liberty.