Related Experiment Video
Updated: Jul 6, 2026
06:27
Transcutaneous Microcirculatory Imaging in Preterm Neonates
Published on: December 31, 2015
Sex-specific differences in peripheral microvascular blood flow in preterm infants
Michal J Stark1, Vicki L Clifton, Ian M R Wright
1Mother and Babies Research Centre, University of Newcastle, Newcastle, NSW 2305, Australia.
Pediatric Research
|March 22, 2008
Summary
Preterm male infants show distinct microvascular blood flow patterns and responses compared to females in early life. These sex-specific differences may contribute to higher morbidity and mortality rates in preterm males.
Area of Science:
- Neonatal Physiology
- Cardiovascular Research
- Pediatric Medicine
Background:
- Physiologic instability in preterm infants is linked to microvascular blood flow.
- Understanding sex-specific vascular responses is crucial for neonatal care.
Purpose of the Study:
- To investigate sex-specific differences in basal microvascular blood flow in preterm infants.
- To assess the microvasculature's response to vasoactive stimuli following preterm birth.
- To explore the relationship between gestational age, sex, and vascular function.
Main Methods:
- Ninety-six infants (24-28 wk and 29-36 wk gestational age) were studied on days 1-5.
- Laser Doppler flowmetry measured baseline microvascular blood flow and vasodilatation.
- Responses to acetylcholine and local warming were assessed.
Main Results:
- A significant interaction of gestational age and sex affected baseline flow at 24 h.
- Male infants (24-28 wk) had higher baseline flow and a link between flow and acetylcholine response.
- Infants born at 24-28 wk showed greater vasodilatation to local warming than those born at 29-36 wk.
Conclusions:
- Sex-specific differences in microvascular blood flow and vasodilatory capacity exist in preterm neonates.
- These early vascular differences may impact transitional circulation.
- Potential contribution to higher morbidity and mortality in preterm males.
Related Concept Videos
01:07Development of Blood Vessels
The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
01:29Blood Flow
Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
01:14Fetal Circulation
Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
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...
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...