Question: Question linked to image nº12 An 88-year-old woman with a history of Alzheimer's dementia, mitral insufficiency and persistent atrial fibrillation, enters a hospital due to a deterioration in her general condition that is attributed to a urinary tract infection. The peripheral venous routes are not accessible and it is decided to channel a central vein through a peripheral vein (cephalic vein) guided by ultrasound. Once the technique is done, it is verified that the blood flows back normally through the catheter. The patient did not present any complications during the maneuver and a catheter control X-ray was later performed. Where do you think the distal end of the catheter has been located? 
 Options:  <1> Right subclavian vein <2> Right jugular vein <3> Vena cava superior. <4> Right basilic vein. <5> Brachiocephalic trunk.
4