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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
Published on: October 22, 2014
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A validation of estimated total peripheral resistance using twin data.
LaBarron K Hill1, John J Sollers Iii, Christopher L Edwards
1Duke University, Durham.
Biomedical Sciences Instrumentation
|November 19, 2014
Summary
This study validates a new method for estimating total peripheral resistance (TPR), finding it has significant genetic heritability in African Americans. This supports its use for understanding hypertension risk factors.
Area of Science:
- Cardiovascular Physiology
- Human Genetics
- Hypertension Research
Background:
- Elevated total peripheral resistance (TPR) is linked to higher hypertension rates in African Americans.
- Genetic factors significantly influence vascular resistance variability, particularly in this demographic.
- A previously developed equation-based estimate of TPR (TPRest) showed coherence with validated TPR measures.
Purpose of the Study:
- To further validate the equation-based estimate of total peripheral resistance (TPRest).
- To assess the heritability of TPRest in a population-based sample of African American twins.
- To determine if TPRest is a reliable measure for hemodynamic research.
Main Methods:
- Quantitative genetic analysis was applied to TPRest data.
- Heritability was calculated for TPRest at rest and during orthostasis.
- The study utilized a population-based sample of African American monozygotic and dizygotic twins.
Main Results:
- Estimated heritability (h2 = .40) for TPRest was higher in males than other groups.
- Heritability estimates were consistent at both resting baseline and during orthostasis.
- The findings align with previously published heritability estimates for vascular resistance.
Conclusions:
- TPRest is a valid and practical measure for estimating total peripheral resistance.
- Genetic factors play a substantial role in determining TPRest in African Americans.
- This method offers a valuable alternative for deriving hemodynamic data from existing records.
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