Figure 1From: Validation of the severity index by cardiac catheterization and Doppler echocardiography in patients with aortic sclerosis and stenosis Catheterization Gradient vs. Severity Index. A. Severity index as determined by cardiac catheterization for patients with aortic sclerosis (maximum gradient <16 mmHg), mild to moderate AS (maximum gradient 16–64 mmHg) and severe AS (maximum gradient >64 mmHg). The severity index increased with increasing severity of aortic valve disease and was significantly different between the three groups (p < 0.0001 by one-way analysis of variance [ANOVA]). B. Correlation of Catheterization Gradient with Severity Index. There was a strong correlation between square root-transformed maximum catheterization gradient and severity index (r = 0.84).Back to article page