Stenosegrades

Stenosegrades is a term used to describe the gradation or grading of stenosis, which is the narrowing of a vessel or duct. In medical practice, stenosis grades categorize the severity of narrowing to help assess risk and guide treatment. The concept applies to various vessels, including carotid arteries, renal arteries, peripheral arteries, and the aorta.

Grading schemes vary by organ and imaging method, but a common framework uses categories such as mild, moderate, severe, and occlusion. For carotid artery stenosis, many guidelines reference percentages of luminal reduction, with mild often defined as less than 50% stenosis, moderate as roughly 50–69%, severe as 70–99%, and occlusion as complete blockage. Other vascular beds use different thresholds, and the exact cutoffs may differ between imaging modalities and guidelines.

Measurement of stenosis grades relies on imaging studies. Techniques include duplex ultrasound, computed tomography angiography (CTA), magnetic resonance angiography (MRA), and conventional angiography. Grading is generally based on the degree of luminal narrowing, sometimes estimated by flow velocity or cross-sectional area, and may incorporate standardized criteria such as NASCET for carotid stenosis. The chosen method and criteria influence the assigned grade.

Clinical use involves risk stratification and treatment decisions, such as medical management versus revascularization. Grades help estimate stroke or ischemia risk and guide interventions like endarterectomy or stenting when appropriate, while recognizing that grade is one of several factors in comprehensive assessment.

Limitations include imaging variability, hemodynamic factors, and interobserver differences. Stenosegrades is a descriptive tool that must be integrated with patient symptoms, comorbidities, and overall clinical context.