We conducted a prospective cohort study to determine the incidence of asymptomatic thrombosis associated with an indwelling umbilical venous catheter (UVC) and to evaluate the diagnostic accuracy of Doppler echocardiography compared with contrast venography. The mean birth weight (SD) of the 47 eligible infants was 1962 (1101.5) g, and the mean gestational age (SD) was 32.
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