aortic valve area
Hemodynamic measurement of effective aortic valve opening, critical for assessing aortic stenosis severity.
Full Definition
Aortic valve area (AVA) represents the effective orifice area of the aortic valve, typically measured using echocardiographic techniques such as the continuity equation or planimetry. Normal aortic valve area ranges from 2.5-4.0 cm², with severe aortic stenosis defined as an area less than 1.0 cm² (or <0.6 cm²/m² indexed to body surface area). This measurement is crucial for surgical decision-making and anesthetic planning, as severe stenosis significantly impacts cardiac output and requires careful hemodynamic management. The measurement guides perioperative fluid management, choice of vasoactive agents, and monitoring strategies during cardiac surgery.
Usage
Usage note: Always express with units (cm² or cm²/m²); abbreviate as AVA in clinical contexts.
In Context
- "Preoperative echocardiography revealed severe aortic stenosis with an aortic valve area of 0.7 cm²." — Preoperative assessment
- "The calculated aortic valve area of 0.5 cm² confirmed the need for urgent valve replacement." — Cardiology consultation