Document Detail

Changes in left ventricular diastolic filling patterns before and after the closure of the ductus arteriosus in very-low-birth weight infants.
MedLine Citation:
PMID:  9352626     Owner:  NLM     Status:  MEDLINE    
To evaluate serial changes in left ventricular diastolic filling patterns in preterm infants, we performed echocardiographic examinations in 18 very-low-birth weight infants and 20 fullterm infants before and after the closure of the ductus arteriosus. In the fullterm infants, the ductal closure induced significant decreases in the peak velocity and flow velocity integral of early diastole, first third filling fraction, and mitral stroke volume. In the preterm infants, by contrast, there were significant increases in the flow velocity integral of early diastole, first third filling fraction, and mitral stroke volume after the ductal closure. No differences following the ductal closure were found in the atrial phase of filling and peak filling rate normalized to stroke volume in either group. When the ductus arteriosus was open, essentially the same left-to-right shunting of the ductus arteriosus was detected in both preterm and fullterm infants, but the Doppler flow patterns of the patent foramen ovale were different: the fullterm infants had a single flow peak mainly during ventricular late systole and early diastole, but the preterm infants had two or three flow peaks with nearly equal amplitudes lasting from ventricular systole to diastole, which resembled the Doppler flow pattern of atrial septal defect. Only a faint Doppler flow signal of the foramen ovale was observed after the ductus arteriosus closed. Our results obtained from the preterms suggest that the left-to-right shunt through the foramen ovale may be one important factor to alter the Doppler transmitral filling patterns during the fetal to neonatal cardiovascular changes.
M Tamura; K Harada; Y Takahashi; T Ito; M Toyono; A Ishida; G Takada
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article    
Journal Detail:
Title:  The Tohoku journal of experimental medicine     Volume:  182     ISSN:  0040-8727     ISO Abbreviation:  Tohoku J. Exp. Med.     Publication Date:  1997 Aug 
Date Detail:
Created Date:  1997-12-22     Completed Date:  1997-12-22     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0417355     Medline TA:  Tohoku J Exp Med     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  337-46     Citation Subset:  IM    
Department of Pediatrics, Akita University School of Medicine, Japan.
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MeSH Terms
Ductus Arteriosus / physiology*,  ultrasonography
Echocardiography, Doppler, Pulsed
Heart Septum / growth & development,  physiology,  ultrasonography
Hemodynamics / physiology
Infant, Newborn
Infant, Very Low Birth Weight / physiology*
Ventricular Function, Left / physiology*

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