Ultrasound Guidance for Radial Arterial Blood Sampling

Inclusion Criteria: * The subject has signed consent * The subject is affiliated with a social security system * Health status necessitates an arterial blood sample for diagnostic, prognostic or therapeutic reasons Exclusion Criteria: * The subject is participating in another study * The subject is in a study exclusion period determined by a previous study * The subject is under guardianship * The subject refuses to sign consent * Impossible to correctly inform the patient * The patient is pregnant, breastfeeding, or parturient * Allergies to one or more of the following: methyl, propylbenzoate, propylene glycol, chlorhexidine gluconate * Contraindication for an arterial puncture (at the radial artery) * Cardio-respiratory arrest