Left ventricular systolic dysfunction (LVSD) refers to impaired contraction of the left ventricle, and can lead to heart failure and death. Early identification of LVSD, which often remains asymptomatic for years, is therefore crucial to mitigate the associated risks through appropriate treatment. Echocardiographic screening of asymptomatic individuals is costly, requires access to experts, and the criteria for selecting potential high-risk individuals for screening remain unclear.

Unlike echocardiography, the electrocardiogram (ECG) is a relatively low-cost procedure, routinely available and requiring little technical training to set up the examination and collect data, making it an interesting tool for early detection of LVSD.

Inclusion Criteria:

• Person who has received full information on the organization of the research and has not objected to the use of this data;
• Age ≥ 50;
• Persons who have undergone an echocardiographic examination and a 12-lead ECG examination during consultations at the CHRU de Nancy;
• Persons with at least one cardiovascular risk (obesity, diabetes, hypertension, etc.).

Exclusion Criteria:

• People with a history of heart disease (ischemic, valvular);
• Patients with significant 12-lead ECG abnormalities (complete bundle branch block, sequelae of myocardial infarction, etc.);
• ECG tracings or echocardiograms that cannot be analyzed.

Patients seen in consultation at the Cardiology Department of the Nancy CHRU who performed an echocardiography and a 12-lead ECG.