Determinants of Malignant Hypertension Onset and Related Target Organ Damages: the HAMA Biobank

Malignant hypertension (MH) is an acute and severe form of hypertension that can lead to rapid target organ damage and potentially be fatal within months if not treated. Despite the severity, MH manifests in various phenotypes, suggesting multiple underlying pathophysiological pathways. The HAMA bank aims to address this by collecting biological samples at two distinct time-points:

For " Pre-existing Patients " in the HAMA cohort: A one-time collection focused on genetic analysis. A full sample (equivalent to sample 1 below) may be collected in option.

For Newly Diagnosed Patients (Incident Patients): Sample 1 "Acute Phase": Collected between Day 0 and Day 7 post-admission to any HAMA recruiting centers. This will be used for initial multi-omics analysis. Sample 2 "Chronic Phase": Collected between the 1st and 6th months during a follow-up visit at the investigating center.

These samples will be cross-referenced with clinical and biological data from the HAMA cohort. The cohort follow-up schedule is: 1, 3, 6, 12 months after MH diagnosis and annually for a total of 5 years.

Inclusion criteria

• patients included in the HAMA cohort with the following critera :

• Malignant hypertension according to the classic definition (Severe hypertension associated with severe hypertensive retinopathy)
• Severe hypertension associated with acute target organ damage due to high blood pressure

Exclusion criteria

• Refusal to participate to the substudy " HAMA bank "
• patient on chronic dialysis