Related Experiment Video
Updated: Mar 6, 2026
Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound 30/45MHZ System
Published on: May 5, 2018
The effect of maternal hyperoxygenation on fetal circulatory system in normal growth and IUGR fetuses. What we can
Nizar Khatib1, Israel Thaler1, Ron Beloosesky2
1a Rambam Medical Center , Haifa , Israel.
Purpose:
The objectives of study were to assess and compare the effects of maternal hyperoxygenation on fetal circulation, in fetuses with intrauterine growth retardation and normal fetal growth.
Methods:
Twelve singleton pregnant women with normal fetal growth and 12 singleton pregnant women with intrauterine growth restriction were recruited. Mean gestational age of 35.2 ± 3.5 and 34.7 ± 3.9 weeks, respectively. Doppler blood flow velocity waveforms were obtained from the middle cerebral artery, umbilical, main and proximal right pulmonary arteries. Pulsatility indices were calculated for all the vessels. Peak systolic velocity was determined for the middle cerebral artery. Following baseline measurements; each woman received 70% humidified oxygen for 10 min. Doppler measurements were then repeated.
Results:
The pulsatility index in the middle cerebral artery increased significantly from 1.5 ± 0.27 to 1.88 ± 0.48, respectively (p = .006) in the high-risk group. However, it did not change significantly in the low-risk group. Hyperoxygenation caused a significant decrease in pulsatility indices in the pulmonary arteries for both groups.
Conclusions:
Hyperoxygenation interrupts the relative brain-sparing effect in the intrauterine growth retardation group, but it did not significantly change the pulsatility index of the middle cerebral artery in fetuses with adequate weight. The pulsatility index in the pulmonary arteries decreased significantly following hyperoxygenation.
Related Concept Videos
01:14Fetal Circulation
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
01:27Oxygen Transport in the Blood
01:20Respiration and Gaseous Exchange
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves...
01:19Respiratory Assessment: Purpose and Indications
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
01:21Acute Respiratory Failure-II
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
01:23Physiological Control of Respiration
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...