Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Randomized Study Evaluating the Role of Ultra-sound Guidance When Drawing Radial Arterial Blood Samples
Brief Summary: Previous studies have demonstrated that an experienced ultrasound operator is able to efficiently perform radial arterial puncture on patients where an initial operator failed to puncture arteries via simple palpation.

The objective of this study is to compare "difficult-to-puncture" patients randomized into two groups: one group where ultrasound is used to aid artery localisation, and one group where only palpation is used.


Options:
A: 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
B: 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
C: Inclusion Criteria:

* Surgery under general anesthesia
* Requires invasive arterial blood pressure monitoring

Exclusion Criteria:

* Infection/hematoma/skin disease/arteriovenous fistula/recent catheterization scar in radial artery or posterior tibial artery
* Peripheral vascular disease
* Congenital aortic disease
D: Inclusion Criteria:

* Adult patients presenting for cardiac or peripheral catheterization with planned radial approach.
* Barbeau's or Allen's test indicating at least some degree of collateral circulation in palmar vessels
* Functional ultrasound equipment with ultrasound trained attending operator

Exclusion Criteria:

* Inability to provide informed consent
* Femoral access
* Emergency procedure (Shock, STEMI)
* End-stage renal disease on hemodialysis
* Previous ipsilateral puncture within 1 week

Answer: A