The heart's main exit can narrow, forcing muscle to thicken
In short: Imagine a door that refuses to open wide enough for its inhabitants to pass through. In aortic stenosis, the heart’s primary exit becomes restricted, creating a pressure trap that forces the heart muscle to work harder until it begins to fail.
Aortic stenosis (AS) occurs when the aortic valve—the three-leaflet structure separating the left ventricle from the aorta—fails to open fully. In a healthy heart, this valve opens three to five square centimeters during contraction. When it narrows, blood flow is restricted, causing pressure to build inside the heart. This creates a 'pressure overload' phenomenon where the muscle of the left ventricle must work harder to pump blood through the opening. Over time, this constant strain causes the left ventricle muscle to become thicker and stiffer. In a strange twist, expanding muscle tissue shrinks the available volume for blood, potentially decreasing oxygen delivery to the body and causing heart failure.
The disease is often progressive, driven by an active inflammatory process that leads to calcification or scar tissue buildup on the valve. While AS is common in older adults—with a prevalence of 6% or greater in those aged 75 or older in the United States—it can also be congenital. Individuals born with a bicuspid (two-cusp) or unicuspid valve may experience significant narrowing much earlier, sometimes in their fifties or sixties. Clinical management varies by severity: mild cases may only require routine monitoring, while severe symptoms like chest pain, fainting, or shortness of breath often necessitate surgical intervention or valve replacement.
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Sources
- Summary by Intellect · source: Aortic Stenosis - Overview (signs and symptoms, pathophysiology, treatment)
- Also: What Is Aortic Stenosis?
- Also: Aortic Stenosis Overview
- Also: Aortic valve stenosis - Symptoms and causes
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