The aim of this pilot study is to determine, as exhaustively as possible thanks to the continuous and precise recording of heart rhythm, the frequency of de novo atrial fibrillation in septic shock, which is currently unknown, and to identify specific factors that could be associated with the condition. These will be investigated more precisely in a future study. This constitutes the first step in a reflection on the management of Cardiac Arrhythmia by Atrial fibrillation (ACFA) in septic shock in Medical Intensive Care, known as a major prognostic factor for morbimortality, but for which management is uncertain in the absence of reference data.

Inclusion Criteria:

• All patients in septic shock (defined as hypotension that is not reversed by fluid resuscitation and requires the use of vasopressor agents) hospitalized in Medical intensive care
• Patients with national health insurance cover
• Age: at least 18 years with no upper limit

Exclusion Criteria:

• Transferred from another intensive care unit for septic shock
• Adults under guardianship
• History of atrial fibrillation