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Coronary arterial tree remodeling in right ventricular hypertrophy
G S Kassab1, K Imoto, F C White
1Department of Applied Mechanics and Engineering Sciences/Bioengineering, University of California, San Diego, La Jolla 92093-0412.
The American Journal of Physiology
|July 1, 1993
Summary
Right ventricular hypertrophy (RVH) causes significant remodeling of coronary arteries, increasing flow channels and reducing resistance. This adaptation is crucial for understanding right ventricle hemodynamics in disease.
Area of Science:
- Cardiovascular physiology
- Vascular biology
- Cardiac remodeling
Background:
- Right ventricular hypertrophy (RVH) is a pathological condition affecting the heart's right ventricle.
- Understanding coronary vascular adaptations in RVH is critical for managing cardiac health.
Purpose of the Study:
- To investigate the coronary vascular adaptations in pigs with induced right ventricular hypertrophy (RVH).
- To analyze morphometric changes in the right coronary arteries (RCA) in response to RVH.
Main Methods:
- Induction of RVH in pigs via pulmonary artery stenosis.
- Autopsy and silicone elastomer casting of the right coronary arteries (RCA).
- Morphometric analysis using a modified Strahler's ordering scheme.
Main Results:
- RVH led to an increased number of vessel orders and a significant increase in the total number of elements per order.
- Vessel diameters and lengths decreased slightly, but total cross-sectional area (CSA) increased, reducing RCA resistance.
- Remodeling of the RCA included increased lumen diameter and the establishment of new flow channels.
Conclusions:
- Significant morphometric remodeling of the coronary arterial vasculature occurs in RVH.
- The decrease in RCA resistance is attributed to a numerical increase in resistance vessels, creating new flow channels.
- Future analyses of right ventricle hemodynamics in hypertrophy must consider these morphometric remodeling changes.