aortic impedance mismatch
Hemodynamic condition where differences in elastic properties between native aorta and prosthetic graft material affect wave reflection patterns.
Full Definition
Aortic impedance mismatch refers to the hemodynamic consequences that occur when prosthetic graft material with different elastic properties is interposed in the aortic circulation. Native aortic tissue has specific compliance characteristics that help dampen pressure waves and optimize cardiac efficiency through the Windkessel effect. When rigid prosthetic materials replace compliant aortic tissue, altered wave reflection patterns can increase afterload, reduce coronary perfusion, and affect left ventricular function. This concept is particularly relevant in extensive aortic replacements and influences prosthetic material selection and surgical technique.
In Context
- "Extensive aortic replacement may result in clinically significant aortic impedance mismatch." — Physiological review article
- "Novel graft materials aim to reduce aortic impedance mismatch through improved compliance properties." — Biomedical engineering paper