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Radial artery catheters are frequently placed in the emergency department (ED) and intensive care unit (ICU) for hemodynamic monitoring and arterial blood gas analysis. A number of small studies have compared ultrasound-guided placement of radial artery catheters to traditional placement via palpation. These authors conducted a meta-analysis of randomized, controlled trials comparing the two techniques to determine the relative success rates of first-attempt arterial cannulation.
Eleven trials involving 803 patients (502 adults in seven studies and 301 children in four) met the inclusion criteria. Ultrasound guidance was associated with a significantly higher rate of first-attempt success than palpation (relative risk, 1.47). This result hel…