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Updated: Feb 21, 2026
Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction
Published on: June 29, 2013
Poor perinatal growth impairs baboon aortic windkessel function
11Department of Radiology and Research Imaging Institute,University of Texas Health Science Center at San Antonio,San Antonio,TX,USA.
Insights
Intrauterine growth restriction (IUGR) in baboons leads to impaired aortic development and reduced distensibility in adulthood. These vascular abnormalities suggest a persistent impact of early-life nutrition on cardiovascular health.
Area of Science:
- Cardiovascular Physiology
- Developmental Biology
- Vascular Medicine
Background:
- The aorta's Windkessel function is crucial for cardiovascular health.
- Intrauterine growth restriction (IUGR) from maternal nutrient reduction is linked to cardiac dysfunction and vascular issues.
- Previous studies indicated downstream vascular abnormalities in IUGR baboons.
Purpose of the Study:
- To investigate aortic cross-section (AC) and distensibility (AD) in adult IUGR baboons.
- To determine if vascular abnormalities persist into adulthood.
- To assess potential sex differences in these vascular parameters.
Main Methods:
- Utilized 3 Tesla Magnetic Resonance Imaging (3 T MRI) for quantitative analysis.
- Examined distal descending aortic AC and AD in IUGR and control baboon groups.
- Employed Analysis of Variance (ANOVA) for statistical comparison.
Main Results:
- IUGR offspring exhibited significantly decreased AC indexed to body surface area compared to controls.
- Aortic distensibility (AD) was markedly reduced in IUGR baboons.
- No significant sex differences or group-sex interactions were observed for AC or AD.
Conclusions:
- Persistent intrinsic vascular pathology in the aorta of adult IUGR baboons.
- Impaired aortic development due to early-life nutritional insult continues into adulthood.
- Findings suggest potential long-term cardiovascular consequences, including effects on coronary perfusion and blood pressure.
Abstract:
The ability of the aorta to buffer blood flow and provide diastolic perfusion (Windkessel function) is a determinant of cardiovascular health. We have reported cardiac dysfunction indicating downstream vascular abnormalities in young adult baboons who were intrauterine growth restricted (IUGR) at birth as a result of moderate maternal nutrient reduction. Using 3 T MRI, we examined IUGR offspring (eight male, eight female; 5.7 years; human equivalent 25 years) and age-matched controls (eight male, eight female; 5.6 years) to quantify distal descending aortic cross-section (AC) and distensibility (AD). ANOVA showed decreased IUGR AC/body surface area (0.9±0.05 cm2/m2 v. 1.2±0.06 cm2/m2, M±s.e.m., P<0.005) and AD (1.7±0.2 v. 4.0±0.5×10-3/mmHg, P<0.005) without sex difference or group-sex interaction, suggesting intrinsic vascular pathology and impaired development persisting in adulthood. Future studies should evaluate potential consequences of these changes on coronary perfusion, afterload and blood pressure.
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