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Related Experiment Videos

Compensatory angiogenesis during progressive right ventricular hypertrophy.

F C White1, Y Nakatani, L Nimmo

  • 1Department of Pathology, UCSD School of Medicine, La Jolla, CA 92093-0612.

The American Journal of Cardiovascular Pathology
|January 1, 1992
PubMed
Summary
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Angiogenesis, the growth of new blood vessels, helps prevent changes in coronary blood flow reserve during progressive right ventricular hypertrophy (RVH) in pigs. This vascular adaptation is not uniform across all stages of RVH.

Area of Science:

  • Cardiovascular Physiology
  • Vascular Biology
  • Cardiac Adaptation

Background:

  • Progressive right ventricular hypertrophy (RVH) can lead to significant cardiovascular changes.
  • Understanding vascular adaptations is crucial for managing RVH and preventing complications.
  • Previous studies have not fully elucidated the role of angiogenesis in RVH-induced vascular remodeling.

Purpose of the Study:

  • To investigate vascular adaptations, specifically angiogenesis, in response to progressive right ventricular hypertrophy (RVH) in a porcine model.
  • To assess the impact of RVH on coronary blood flow reserve (CBFR) during exercise and vasodilation.
  • To correlate morphometric changes with DNA synthesis to understand the mechanisms of vascular adaptation.

Main Methods:

  • Progressive RVH was induced in mini pigs using an inflatable cuff on the main pulmonary artery.

Related Experiment Videos

  • Animals were divided into moderate RVH (MH) and severe hypertrophy (SH) groups.
  • Coronary blood flow reserve (CBFR) was measured using radiolabelled microspheres during maximal exercise and adenosine vasodilation.
  • Morphometric analysis of myocytes, capillaries, and arterioles was performed.
  • DNA synthesis was assessed using tritiated thymidine labeling.

    • Main Results:

    • Adenosine vasodilation did not alter CBFR in either MH or SH groups.
    • Exercise induced a minor but significant decrease in CBFR in the SH group.
    • Myocyte cross-sectional area increased; capillary and arteriole size and density increased in both MH and SH groups.
    • Capillary density showed a slight decrease in both groups.
    • High DNA synthesis was observed in endothelial cells and moderate synthesis in smooth muscle cells during early hypertrophy.

    Conclusions:

    • Angiogenesis, evidenced by increased capillary and arteriole size/density and DNA synthesis, plays a key role in preventing significant alterations in CBFR during progressive RVH in pigs.
    • The observed angiogenesis is not uniform across different stages of progressive RVH.
    • These findings highlight the heart's adaptive capacity through vascular remodeling in response to sustained pressure overload.