What SMA velocity indicates a significant stenosis of 70% or more?

A significant stenosis of 70% or more in the Superior Mesenteric Artery (SMA) is typically indicated by a velocity measurement that exceeds 275 cm/sec. This threshold is established based on the hemodynamic changes that occur as a result of narrowing in the arterial lumen. When there is a stenosis of this severity, the blood flow becomes more turbulent and accelerated due to the constriction, leading to an increase in the velocity of blood flow past the area of narrowing.

In clinical practice, the established measurement of 275 cm/sec serves as a reliable marker for identifying significant stenosis. This measurement is important for diagnosis and can guide further management and treatment of the patient. The understanding of these velocity thresholds is crucial for interpreting ultrasound results accurately and determining the severity of vascular disease.