Coronary microcirculatory dysfunction in aortic stenosis: myocardial contrast echocardiography study

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Cardiac Physiology

Background:

• Aortic stenosis (AS) is associated with microcirculatory dysfunction.
• Quantitative myocardial contrast echocardiography (MCE) can assess myocardial perfusion.

Purpose of the Study:

• To quantify microcirculatory dysfunction in aortic stenosis (AS).
• To measure changes in transmural perfusion after aortic valve replacement (AVR).

Main Methods:

• Myocardial contrast echocardiography (MCE) was used to quantify myocardial blood flow in the subendocardium and subepicardium.
• 22 patients with AS were studied before, 2 weeks after, and 1 year after AVR.
• 10 healthy volunteers and 10 patients with mitral regurgitation served as controls.

Main Results:

• Pre-AVR, subendocardial blood flow was significantly lower in AS patients compared to controls.
• Subepicardial blood flow showed no significant difference between groups.
• Subendocardial blood flow improved significantly 2 weeks after AVR and was sustained at 1 year.

Conclusions:

• Patients with AS exhibit preoperative subendocardial hypoperfusion.
• Aortic valve replacement (AVR) effectively restores coronary microcirculatory function.
• The recovery of myocardial blood flow post-AVR is durable, persisting at least one year.