Rongpin Wang MD, Presenter: Nothing to Disclose

Chang Hong Liang MD, Abstract Co-Author: Nothing to Disclose

Meiping Huang MD, Abstract Co-Author: Nothing to Disclose

Qiping Deng MD,MD, Abstract Co-Author: Nothing to Disclose

To investigate the morphology and hemodynamics of cavopulmonary stoma for patients with bidirectional Glenn shunt (BGS) by comparing the results of MR imaging with that of Ultrasonic cardiography (UCG).

Phase-contrast MR imaging (PC-MRI) sequence and contrast enhanced MR imaging (CE-MRI) sequence on superior vena cava (SVC) and inferior vena cava (IVC) were performed in 22 patients with BGS at 3 tesla system. The width, peak flow velocity and gradient pressure of superior cavopulmonary stoma were calculated by using Report Card software, and UCG was performed to compare those parameters. The results of blood flow of SVC and IVC, and the results of width, peak flow velocity and gradient pressure of superior cavopulmonary stoma obtained by MRI and UCG were evaluated with paired-samples t-test and pearson’s correlation analysis. P＜0.05 was set as statistical significance.

The blood flow of SVC (1.002±0.208 L/min) was significantly lower than that of IVC (1.794±0.392 L/min), while the regurgitation fraction of SVC (26.54±12.82 %) was significantly higher than that of IVC (17.44±10.17 %). The angiostenosis, thrombogenesis and other abnormality of cavopulmonary stoma and the adjacent vessels could be clearly displayed with CE-MRI, while those abnormal morphology could not be detected with UCG. The width of cavopulmonary stoma measured with MRI was significantly higher than that of UCG (d=1.42, t=4.048, P=0.000), while the peak flow velocity of cavopulmonary stoma measured with MRI was significantly lower than that of UCG (d=-4.42, t=-2.237, P=0.034). No significant difference was found in gradient pressure of cavopulmonary stoma between the values of MRI and UCG (t=-2.01, P=0.055). The results of width, peak flow velocity and gradient pressure of superior cavopulmonary stoma obtained by MRI were closely correlated with those of UCG (r=0.427～0.858, all P<0.05).

A good correlation was found in the width, peak flow velocity and the gradient pressure of the cavopulmonary stoma obtained by 3.0 tesla MRI and UCG, but MRI has a great advantage in displaying the width and abnormal morphology.

PC-MRI integrating CE-MRI can assess the hemodynamics and morphology of superior cavopulmonary stoma and is recommended in the evaluation of patients underwent bidirectional Glenn shunt.

Wang, R, Liang, C, Huang, M, Deng, Q, A Comparative Study of MRI and UCG in Morphology and Hemodynamics of Cavopulmonary Stoma for Patients with Bi-directional Glenn Shunt.  Radiological Society of North America 2011 Scientific Assembly and Annual Meeting, November 26 - December 2, 2011 ,Chicago IL. http://archive.rsna.org/2011/11008551.html