TY - JOUR
T1 - Measurement of pulmonary circulation parameters using time-resolved MR angiography in patients after ross procedure
AU - Lakoma, Anna
AU - Tuite, David
AU - Sheehan, John
AU - Weale, Peter
AU - Carr, James
PY - 2010/4/1
Y1 - 2010/4/1
N2 - OBJECTIVE. The purposes of our study were to retrospectively evaluate the pulmonary circulation parameters of pulmonary transit time and pulmonary blood volume in patients after Ross procedures using time-resolved MR angiography and to investigate associations with right ventricular dysfunction in the same group of patients. MATERIALS AND METHODS. Sixteen patients who had undergone a Ross procedure (12 men, four women; mean age, 42.13 ± 14.24 years; age range, 21-68 years) and 16 age- and sex-matched control patients (12 men, 4 women; mean age, 42.25 ± 14.62 years; age range, 21-68 years) were evaluated using cardiac MRI and Argus postprocessing software. Right and left ventricular volumetric parameters, including ejection fraction, end-systolic volume, and end-diastolic volume, were measured from cine true fast imaging with steady-state precession images. Pulmonary circulation parameters, including pulmonary transit time, were measured using dynamic time-resolved MR angiography and pulmonary blood volume was calculated. Pulmonary circulation parameters were correlated with volumetric parameters. The results were statistically analyzed using the Mann-Whitney U test, paired-samples Student's t test, Pearson's correlation, and linear regression. RESULTS. Pulmonary circulation parameters were significantly prolonged in patients after the Ross procedure compared with control patients (p < 0.01). Strong correlations exist between pulmonary circulation parameters and right ventricular function, especially pulmonary transit time and right ventricular ejection fraction (R > 0.60, p < 0.001). CONCLUSION. Patients after undergoing the Ross procedure had prolonged pulmonary transit times compared with normal control patients; this and other pulmonary circulation parameters best correlate with worsened right ventricular ejection fraction and may be predictors of right ventricular dysfunction in this group of patients.
AB - OBJECTIVE. The purposes of our study were to retrospectively evaluate the pulmonary circulation parameters of pulmonary transit time and pulmonary blood volume in patients after Ross procedures using time-resolved MR angiography and to investigate associations with right ventricular dysfunction in the same group of patients. MATERIALS AND METHODS. Sixteen patients who had undergone a Ross procedure (12 men, four women; mean age, 42.13 ± 14.24 years; age range, 21-68 years) and 16 age- and sex-matched control patients (12 men, 4 women; mean age, 42.25 ± 14.62 years; age range, 21-68 years) were evaluated using cardiac MRI and Argus postprocessing software. Right and left ventricular volumetric parameters, including ejection fraction, end-systolic volume, and end-diastolic volume, were measured from cine true fast imaging with steady-state precession images. Pulmonary circulation parameters, including pulmonary transit time, were measured using dynamic time-resolved MR angiography and pulmonary blood volume was calculated. Pulmonary circulation parameters were correlated with volumetric parameters. The results were statistically analyzed using the Mann-Whitney U test, paired-samples Student's t test, Pearson's correlation, and linear regression. RESULTS. Pulmonary circulation parameters were significantly prolonged in patients after the Ross procedure compared with control patients (p < 0.01). Strong correlations exist between pulmonary circulation parameters and right ventricular function, especially pulmonary transit time and right ventricular ejection fraction (R > 0.60, p < 0.001). CONCLUSION. Patients after undergoing the Ross procedure had prolonged pulmonary transit times compared with normal control patients; this and other pulmonary circulation parameters best correlate with worsened right ventricular ejection fraction and may be predictors of right ventricular dysfunction in this group of patients.
KW - MR angiography
KW - Pulmonary transit time
KW - Right ventricular dysfunction
KW - Ross procedure
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U2 - 10.2214/AJR.09.2897
DO - 10.2214/AJR.09.2897
M3 - Article
C2 - 20308491
AN - SCOPUS:77950667884
SN - 0361-803X
VL - 194
SP - 912
EP - 919
JO - The American journal of roentgenology and radium therapy
JF - The American journal of roentgenology and radium therapy
IS - 4
ER -