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We read with interest the paper by Neil Patel et al1 on cardiac output measurement in newborn infants, comparing cardiac output monitoring (USCOM) with conventional echocardiography. One of their main findings was that agreement between USCOM and conventional echocardiography was broad, and a substantial difference between left and right ventricular output was noted (LVO: 233±57 ml/kg/min; RVO: 338±83 ml/kg/min). Of note, a difference in LVO and RVO was also seen when assessed by conventional echocardiography. This is in line with the results of our study using the USCOM …
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.