Abstract
Studies were carried out on seven fetal lambs, 3 to 1 weeks prior to the expected date of delivery to determine if, during fetal breathing, cardiovascular events were similar to those described as occurring with respiration after birth. The following changes were observed; (1) a slight decrease in pressures with the initiation of the rapid inspiratory movements followed by: (2) a marked elevation of the systolic and diastolic pressures; (3) a cyclic variation characterized by a fall in arterial pressure with inspiration; (4) a variable acceleration of the heart rate; and finally, (5) a typical respiratory arrhythmia. These findings demonstrated that, during fetal respiratory movements, there are some cardiovascular changes which are specific to this period of life. There are other changes which are identical to what has been observed after birth. These latter cardiovascular changes imply that the endotracheal pressure variations are the reflection of authentic inspiratory movements under the influence of the central nervous system.
Citations
Jan 1, 1990·American Journal of Obstetrics and Gynecology·J C FouronH Bard
Jul 10, 2007·Ultrasound in Medicine & Biology·Gabriele C Meyberg-SolomayerErich Solomayer
Jan 1, 1988·Ultrasound in Medicine & Biology·P R HoskinsS E Chambers
Mar 1, 1985·Ultrasound in Medicine & Biology·T Cohen-OverbeekS Campbell
Jun 1, 1978·American Journal of Obstetrics and Gynecology·P L Wilds
Jun 1, 1995·Acta Physiologica Scandinavica·T MetsäläI Välimäki
Feb 1, 1993·Acta Physiologica Scandinavica·T MetsäläI Välimäki
Jan 1, 1978·British Journal of Obstetrics and Gynaecology·T Wheeler, A Murrills
Jan 1, 1985·Ultrasound in Medicine & Biology·Y ChibaT Hasegawa
Dec 1, 1980·British Journal of Obstetrics and Gynaecology·T WheelerA J Murrills
Jan 1, 1985·British Journal of Obstetrics and Gynaecology·B J TrudingerL Collins
Jan 1, 1982·Journal of Perinatal Medicine·M CampograndeS Bussolino
Feb 1, 1990·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·P R Hoskins
Apr 6, 2000·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·J Altimiras, D A Crossley
Sep 1, 1987·Placenta·J P NewnhamS E Reid