Fetal atrioventricular and outflow tract flow velocity waveforms during normal second half of pregnancy

American Journal of Obstetrics and Gynecology
K van der MoorenJ W Wladimiroff

Abstract

Maximum flow velocity waveforms at atrioventricular and outflow tract level were studied longitudinally in 40 fetuses from 18 to 38 weeks' gestation at 3- to 4-week intervals. Flow velocity parameters studied were peak systolic and time-averaged velocity and acceleration time at outflow tract level and time-averaged velocity, peak E-wave and peak A-wave velocities, and E/A ratio at atrioventricular level. An increase of all flow parameters with advancing gestational age was found. Aortic parameters were higher than pulmonary ones. Time-averaged, peak E-wave, and peak A-wave velocities were higher at tricuspid level than at mitral level, whereas E/A ratios were higher at mitral level. Outflow tract parameters showed no correlation with period time. A positive correlation for peak E-wave velocity and E/A ratio, and a negative correlation for time-averaged and peak A-wave velocity was found with period time. These results suggest that the normal second half of pregnancy is characterized by rising ventricular stroke volume and output and reduction in ventricular afterload. The left ventricular afterload seems to be lower than the right ventricular afterload. Atrioventricular flow velocities are heart rate dependent.

References

Jan 1, 1986·Circulation·K L ReedL Shenker
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Citations

Jan 16, 2003·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·J-L BigrasB W McCrindle
Jun 10, 2000·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·G Mielke, N Benda
Feb 13, 2001·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·J A Laudy, J W Wladimiroff
May 8, 2001·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·S CampbellJ S Carvalho
Aug 8, 2001·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·H GardinerK Marsál
Jun 22, 2000·Heart·P JohnsonL D Allan
Dec 23, 2003·Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Médicas E Biológicas·P ZielinskyR T Cardoso
May 28, 2003·Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology·C Firpo, P Zielinsky
Jun 9, 2012·Fetal Diagnosis and Therapy·Edgar Hernandez-AndradeJavier Mancilla-Ramirez
Nov 1, 2013·Australasian Journal of Ultrasound in Medicine·Fàtima CrispiEduard Gratacós
Apr 20, 2019·The Journal of Maternal-fetal & Neonatal Medicine : the Official Journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians·Alberto Borges PeixotoEdward Araujo Júnior
Jan 10, 2019·The International Journal of Cardiovascular Imaging·Yan Kai MaoShan Shan Wang

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