In emergency, it is advisable to use low-cost short-term cannulas (in teflon; without wing; without preassembled extension), to be removed within 24-48 hours. In the child, the caliber should be 22G or 20G: in the hypovolemic child, in whom rapid infusion of fluids is expected, or in the child who needs transfusion, 20G cannulas should be used.
Wherever possible, within the limits compatible with the emergency situation, it is advisable that any insertion should follow the recommendations of the INS and EPIC guidelines (insertion site away from flexion zones; hygiene of the operator's hands and clean gloves; skin antisepsis with 2% chlorhexidine in alcohol; cover and securement with transparent semipermeable dressing).