This is a protocol for a Cochrane Review (Intervention). The objectives are as follows:

To assess the benefits and harms of using ultrasound guidance technique for arterial line placement in the paediatric population, as compared to other traditional techniques (palpation, Doppler auditory assistance, and others), at all potential sites for arterial cannulation (left or right radial, ulnar, brachial, femoral, or dorsalis pedis artery).