A Randomized Study Evaluating the Role of Ultra-sound Guidance When Drawing Radial Arterial Blood Samples

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Inclusion criteria

• The patient must have given his/her informed and signed consent
• The patient must be insured or beneficiary of a health insurance plan
• The patient's health status necessitates an arterial blood sample AND his/her radial arteries are deemed unpalpable OR two previous attempts at radial arterial puncture by a nurse resulted in failure

Exclusion criteria

• The patient is participating in another study
• The patient is in an exclusion period determined by a previous study
• The patient is under judicial protection, or any kind of guardianship
• The patient refuses to sign the consent
• It is impossible to correctly inform the patient
• The patient is pregnant, parturient, or breastfeeding
• Arterial puncture is required on femoral, humeral or axillary arteries
• The patient is in cardiac arrest
• The patient has known circulatory problems, ischemia, local infection
• The patient has a severe bleeding or hemostasis disorder (hemophilia, hypoprothrombinemia, platelets <50,000)
• The patient is an upper limb amputee, or his/her arm is in a cast
• The patient has known allergies to methyl or propylbenzoate, propylene glycol or chlorexhidine gluconate