【Abstract】 ObjectiveTo explore the role of high frequency color doppler ultrasonography to position the PICC catheter tips in the upper limb of low birth weight prematures in NICU. Methods33 cases of low birth weight prematures were performed by the bedside chest Xray and high frequency color doppler ultrasonography to observe the position of the catheter tip . Applying ultrasonic to measure the distance between the tip and the unknown venous confluence, or the distance from the tip to where the superior vena cava joints to th right atrium for whose PICC catheter ectopic in unknown vein or the right atrium , and that′s the length for the catheter tips were back up. ResultsIn the 33 cases,ultrasound clearly showed catheter tips of 30 patients (90.90%), Xray radiography displayed catheter tips of 17 cases (51.51%),was statistically significant between the two groups (chisquare =12.490, P=12.490). The patients who were in the right atrium and the subclavicular vein were all retreated to the ideal position under the guidance of ultrasonographic, and the success rate was 100%. Conclusionhigh frequency color doppler ultrasonography is one of the safe and easy methods to locate PICC catheter.

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