aortic diameter index
A calculated ratio of aortic diameter to body surface area used to normalize aortic dimensions for patient size. Helps standardize indications for surgical intervention across patient populations.
Full Definition
The aortic diameter index is a calculated measurement that normalizes aortic diameter measurements to patient body surface area, typically expressed as cm/m². This index is particularly important in pediatric and young adult populations where absolute diameter measurements may not accurately reflect the severity of aortic dilatation. The index helps standardize surgical indications across different patient sizes and is especially valuable in conditions like Marfan syndrome where aortic dimensions relative to body size are more clinically relevant than absolute measurements. Different aortic segments (root, ascending, arch) may have different normal index values, and cutoff values for intervention are typically lower than absolute diameter criteria.
Usage
Usage note: Always specify the units (cm/m²) and indicate which aortic segment was measured.
In Context
- "The aortic diameter index of 2.8 cm/m² exceeded the threshold for surgical consideration." — Cardiology consultation note
- "Serial measurements showed progressive increase in the aortic diameter index despite stable absolute dimensions." — Long-term follow-up report