Koert de Waal1, Martin Kluckow, Nick Evans. 1. Department of Newborn Care, John Hunter Children's Hospital and University of Newcastle, NSW, Australia. Electronic address: koert.dewaal@hnehealth.nsw.gov.au.
Abstract
BACKGROUND: Blood flow measurements are an integral part of haemodynamic assessment of the newborn infant. Most variability of Doppler derived blood flow is caused by diameter measurements. Population based percentiles of diameter measurements would be useful for training of clinicians undertaking blood flow measurements and allow rapid identification of outliers. METHODS: Diameter measurements of pulmonary valve annulus, ascending aorta and the superior vena cava using standardised methodology were collected retrospectively from 9 prospective studies on transitional haemodynamics in preterm infants. Data were analysed to calculate weight corrected percentiles of diameters used for blood flow measurements. RESULTS: We analysed 2870 measurements in 694 preterm infants less than 1750 g. The median gestational age was 27 weeks (range 23 to 34 weeks) and the median time of measurement was 22 h after birth (range 0.5 h to 70 days). 76% of measurements were performed while the infant received mechanical ventilation and 20% received cardiovascular support. Mean diameters increased with weight and standard deviations were comparable over the weight range. CONCLUSION: Data from this large combined series provide a reference range for blood vessel diameters in the population most often measured. The data permits recognition of outliers and could be used to trigger review of measurements that fall outside the normal range.
BACKGROUND: Blood flow measurements are an integral part of haemodynamic assessment of the newborn infant. Most variability of Doppler derived blood flow is caused by diameter measurements. Population based percentiles of diameter measurements would be useful for training of clinicians undertaking blood flow measurements and allow rapid identification of outliers. METHODS: Diameter measurements of pulmonary valve annulus, ascending aorta and the superior vena cava using standardised methodology were collected retrospectively from 9 prospective studies on transitional haemodynamics in preterm infants. Data were analysed to calculate weight corrected percentiles of diameters used for blood flow measurements. RESULTS: We analysed 2870 measurements in 694 preterm infants less than 1750 g. The median gestational age was 27 weeks (range 23 to 34 weeks) and the median time of measurement was 22 h after birth (range 0.5 h to 70 days). 76% of measurements were performed while the infant received mechanical ventilation and 20% received cardiovascular support. Mean diameters increased with weight and standard deviations were comparable over the weight range. CONCLUSION: Data from this large combined series provide a reference range for blood vessel diameters in the population most often measured. The data permits recognition of outliers and could be used to trigger review of measurements that fall outside the normal range.
Authors: Marina Maccagnano Zamith; Simone de Araujo Negreiros Figueira; Allan Chiaratti de Oliveira; Cristiane Metolina; Junia Sampel de Castro; Cristina Nunes Dos Santos; Ana Leticia de Oliveira Abrahão de Capo; Valdir Ambrósio Moisés Journal: J Pediatr (Rio J) Date: 2019-06-06 Impact factor: 2.990
Authors: Willem P de Boode; Robin van der Lee; Beate Horsberg Eriksen; Eirik Nestaas; Eugene Dempsey; Yogen Singh; Topun Austin; Afif El-Khuffash Journal: Pediatr Res Date: 2018-07 Impact factor: 3.756