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:

* 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
B: Inclusion Criteria:

* Undergoing vessel catheterization
* Able to give written informed consent

Exclusion Criteria:

* Unable to give informed consent
* Prisoners, pregnant women, and children
C: 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
D: Inclusion Criteria:

* Admission of the first degree relatives of the patients and if the patient can give consent
* Patients over 18
* Non-pregnant patients
* Patients without inotropic/vasopressor support
* Patients who do not have contraindications for radial artery cannulation (thrombosis in the distal region, a focus of infection at the site of entry, lack of adequate collateral flow in the Allen test, peripheral vascular diseases \[eg, Raynaud's disease)\]

Exclusion Criteria:

* Patient/Patient's first degree relatives refuse to work
* Patients under 18
* Pregnant patients
* Patients with contraindications for radial artery cannulation (thrombosis in the distal region, a focus of infection at the site of entry, lack of adequate collateral flow in the Allen test, peripheral vascular diseases \[eg, Raynaud's disease)\]
* Patient's inotropic/vasopressor support

Answer: C