aortic stenosis gradient
The pressure difference across a stenotic aortic valve, measured as peak or mean gradient.
Full Definition
A hemodynamic measurement that quantifies the severity of aortic stenosis by calculating the pressure difference between the left ventricle and aorta during systole. The gradient is typically expressed as either peak instantaneous gradient or mean gradient, with mean gradient being more clinically relevant for severity assessment. Severe aortic stenosis is generally defined as a mean gradient >40 mmHg or peak velocity >4 m/s. This measurement is crucial for anesthetic planning as it indicates the degree of left ventricular outflow obstruction and helps predict hemodynamic instability during anesthesia.
Usage
Usage note: Always specify whether referring to peak or mean gradient, as clinical significance differs.
In Context
- "The aortic stenosis gradient measured 65 mmHg mean, indicating severe disease." — Cardiac catheterization report
- "Despite the elevated aortic stenosis gradient, left ventricular function remained preserved." — Preoperative assessment