Experimental aortic valve stenosis in rabbits.

Area of Science:

• Cardiovascular Research
• Atherosclerosis and Valvular Heart Disease
• Animal Models in Cardiology

Background:

• Aortic valve stenosis (AVS) is the most prevalent valvular heart disease.
• Emerging evidence suggests a connection between atherosclerosis and AVS development.
• Direct proof for this link has been lacking.

Purpose of the Study:

• To investigate the impact of a hypercholesterolemic diet on aortic valve morphology and function in a rabbit model.
• To assess the influence of vitamin D supplementation alongside a hypercholesterolemic diet on AVS progression and calcification.

Main Methods:

• Rabbits were allocated to three groups: control, cholesterol-enriched diet, or cholesterol-enriched diet plus vitamin D2.
• Echocardiography was performed at baseline and 12 weeks to evaluate aortic valve area (AVA) and transvalvular gradients.
• Changes in AVA and gradients were compared across groups over the study period.

Main Results:

• The cholesterol-enriched diet alone did not induce significant aortic valve abnormalities.
• Rabbits receiving both the cholesterol-enriched diet and vitamin D2 supplementation showed a significant decrease in AVA (p = 0.004).
• This group also exhibited significant increases in transvalvular gradients (p = 0.003), indicating worsened AVS.

Conclusions:

• The findings support a potential association between atherosclerosis and the development of aortic valve stenosis.
• The contrasting outcomes between groups suggest a significant role for calcium in AVS pathogenesis, particularly when vitamin D2 is supplemented.
• Further research is warranted to elucidate the role of calcium and vitamin D in AVS.