oxygen saturation gradient
The difference in oxygen saturation between different cardiac chambers or vessels, used to detect intracardiac shunts.
Full Definition
An oxygen saturation gradient refers to the measurable difference in oxygen saturation levels between adjacent cardiac chambers or blood vessels during cardiac catheterization. Significant gradients (typically >7-10%) indicate the presence of intracardiac shunts, with higher saturations downstream from left-to-right shunts. This measurement is crucial for quantifying shunt magnitude and determining the hemodynamic significance of congenital heart defects. The gradient analysis helps guide surgical decision-making and assess the need for intervention in patients with septal defects or other shunt lesions.
Usage
Usage note: Typically measured in percentage points or as a ratio.
In Context
- "A significant oxygen saturation gradient of 12% was noted between the right atrium and right ventricle." — Catheterization findings
- "The absence of an oxygen saturation gradient ruled out a hemodynamically significant left-to-right shunt." — Diagnostic assessment