title: Influence of patent ductus arteriosus and ventilators on electrical velocimetry for measuring cardiac output in very-low/low birth weight infants.
abstract: OBJECTIVE
  We evaluated electrical velocimetry, a noninvasive method for continuous cardiac output measurement, in very-low and low birth weight infants and the influence of patent ductus arteriosus (PDA) and ventilators on this method.
  
  
  METHODS
  This prospective study compared 81 pairs of simultaneous cardiac output measurements by electrical velocimetry and transthoracic echocardiography in 28 patients. Data were compared by correlation, Bland-Altman analysis and two-way analysis of variance.
  
  
  RESULTS
  The two methods exhibited a high correlation (r=0.859, P<0.0001). The bias (mean difference of the methods) and percent error (100 × 1.96 × s.d./mean cardiac output) were -6 ml min(-1) and 29.2%, respectively. PDA significantly affected the bias (P=0.0004), but ventilators did not (P=0.14). Hemodynamically significant PDA had a larger bias (-36 ml min(-1)) and higher percent error (38.6%).
  
  
  CONCLUSIONS
  Although influenced by PDA, electrical velocimetry was generally interchangeable with transthoracic echocardiography even using ventilators.
authors: Department of Neonatology, Niigata City General Hospital, Niigata, Japan.
authors: T
authors: T
authors: Torigoe
authors: Department of Pediatrics, Niigata City General Hospital, Niigata, Japan.
authors: S
authors: S
authors: Sato
authors: Department of Neonatology, Niigata City General Hospital, Niigata, Japan.
authors: Y
authors: Y
authors: Nagayama
authors: Department of Neonatology, Niigata City General Hospital, Niigata, Japan.
authors: T
authors: T
authors: Sato
authors: Department of Neonatology, Niigata City General Hospital, Niigata, Japan.
authors: H
authors: H
authors: Yamazaki
mesh_terms: D002302:Cardiac Output; D004374:Ductus Arteriosus, Patent / Q000503:physiopathology*; D004452:Echocardiography; D005260:Female; D006801:Humans; D007223:Infant; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007234:Infant, Premature; D007235:Infant, Premature, Diseases / Q000503:physiopathology*; D019102:Infant, Very Low Birth Weight; D008297:Male; D011446:Prospective Studies; D012121:Respiration, Artificial; D012212:Rheology / Q000379:methods*
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