ABSTRACT
Objective Aortic dilation in bicuspid aortic valve patients usually begins at the proximal tubular ascending aorta.This study,we investigate the risk factors of aortic root dilation,in advantage of reviewing medical records of bicuspid aortic valve patients with dilated ascending aorta.Methods Include all the bicuspid aortic valve patients with dilated proximal ascending aorta who needed surgical intervention from Jan 1,2003 to May 4,2011.We exclude patients accompanied with aor tic dissection or without echocardiographic report.Divide these patients into group dilation (≥45 mm) and group non-dilation (＜ 45 mm) according to sinus diameters and proceed statistical analysis in SPSS 20.0.Results In univariate analysis,group dilation are younger and higher,and possess higher proportion of male and fusion of right-left coronary cusps,more severe aortic regurgitation,larger left ventricular diameters and higher elevation of total bilirubin,conjugated bilirubin and creatinine,but shorter duration of symptoms,less aortic stenosis and lower ejection fraction.In multivariate analysis with logistic regression model,less aortic stenosis and larger left ventricular end-diastolic diameter are the significant risks of sinus dilation.It's demonstrated in ROC curve analysis,that left ventricular systolic diameter and diastolic diameter are the two most valuable parameters indicating sinus dilation,the sensitivity and specificity is 0.93,0.83 while left ventricular diastolic diameter ＞ 60 mm and 0.79,0.89 while systolic diameter ＞ 45 mm.Conclusion Less aortic stenosis and larger left ventricular end-diastolic diameter are the significant risks of aortic root dilation in bicuspid aortic valve patients accompanied with dilated ascending aorta.The left ventricular systolic and diastolic diameters are the most valuable parameters indicating aortic root dilation.