Application of point-of-care ultrasound-guided tip navigation combined with visualised directional high-frequency linear array probe compression to improve the success rate of umbilical venous catheterisation in critical neonates: protocol of a multicentre randomised controlled trial in neonatal units

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IntroductionConventional umbilical venous catheterisation (UVC) relies on ‘blind’ insertion without ultrasound guidance, resulting in low success and high complication rates. While point-of-care ultrasound (POCUS)-based tip navigation and location has improved...