Left ventricular stroke volume derived from MR velocity maps in the ascending aorta correlated highly with measurements from MR spin echo sequences (correlation coefficient 0.97, p<0.001).
Observational (n=10)
Does left ventricular stroke volume calculated by summing transverse MR slices correlate with stroke output derived from velocity maps in the ascending aorta in healthy volunteers?
MR velocity imaging provides highly accurate measurements of stroke volume compared to standard spin echo sequences, supporting its potential for assessing cardiovascular hemodynamics.
Effect estimate: correlation coefficient 0.97
p-value: p=<0.001
Calculations of left ventricular stroke volume obtained by summing the areas of multiple contiguous transverse magnetic resonance (MR) slices in systole and diastole using a spin echo sequence have been compared in 10 healthy volunteers with the stroke output derived from velocity maps in the ascending aorta using a field even-echo rephasing sequence. The results gave a correlation coefficient of 0.97 (p less than 0.001) and a standard error of estimate of 3.2 ml. Velocity maps have also been obtained in the pulmonary artery, the descending aorta, and the superior vena cava. The accuracy of this technique and the theoretical limitations of MR measurements have implications for the earlier detection of atheroma in the coronary and other arteries.
Firmin et al. (Tue,) conducted a observational in Healthy (n=10). MR velocity maps in the ascending aorta (field even-echo rephasing sequence) vs. MR spin echo sequence (summing areas of contiguous transverse slices) was evaluated on Left ventricular stroke volume correlation (correlation coefficient 0.97, p=<0.001). Left ventricular stroke volume derived from MR velocity maps in the ascending aorta correlated highly with measurements from MR spin echo sequences (correlation coefficient 0.97, p<0.001).