The Value Of 256 Slice CT Posterior Gated LVEF In Ventricular Function Assessment In Patients With Acute AD

Objectives:By 256 slice spiral CT cardiac function,to explore the occurrence of acute aortic dissection is associated with reduced left ventricular ejection fraction.The two methods of examination of CT and cardiac ultrasonography quantitative analysis was carried out in the masurement of ejection fraction,to compare the correlation and variability of the two approaches.A preliminary study for the size of Stanford different classification of dissection of aorta of left ventricular ejection fraction is less than 60% of the impact of left ventricular ejection fraction.Materials and methods:Choose 30 patients with emergency chest,bcck or abdomen pain to our hospital who diagnosed AD use MSCT aorta CTA scanning.After give the 30 patients with cardiac gating retrospectively scanning.And rebuild the four phases images with 0%,40%,45%,75% of the heart throb period.Send all the patients images of the four phases to Phillips Extended Brilliance Workspace workstation.With its own carrying cardiac function analysis software to get left ventricular end systolic volume(40%),left ventricular end-diastolic volume (0%) ,and use the heart function post-processing software of Simpson method in EBW workstation to calculate all LVEF value of the patients.Collect these 30 patients' LVEF use the two methonds of CT and cardiac ultrasonography.Using statistical software to analysis the correlation and difference between the two groups Among them there are 20 cases with LVEF<60%,there are 10 cases with LVEF>60%.According to Stanford aortic dissection,the 20 cases with LVEF<60% were divided into Stanford type A and type B.Preliminarily discuss the Stanford classification of different aortic dissection to the LVEF impacts for all the patients with LVEF<60%.Results:All 30 patients with the acute aorta dissection were able to complete the cardiac backdoor scan and cardiac ultrasonography.1.use backdoor scan of the heart,there are 20 cases with LVEF<60%,occurrence rate:67%,the average age is(57.95 ± 8.61)years old,there are 10 cases with LVEF>60%,occurrence rate:33%,the average age is (51.90 ± 8.75) years old.2.There is a moderate correlation of LVEF between the two methods of CT and cardiac ultrasound,r=0.765,CT: ( 58.03 ±10.84) %,cardiac ultrasound: ( 60.73 ± 5.28 ) %,The matching t is shown there is no statistical difference between the two methods(P>0.05).Compare with the cardiac ultrasound,CT has a relatively low tendency to determine LVEF values,The deviation is about (-2.70 ±7.60) %.3.Amone the 20 cases with LVEF<60% which use backdoor scan of the heart,the LVEF values and ages are in the normal distribution,Among them Stanford type A has 9 cases,the average LVEF is (53.70 ±3.96) %,average age is(54.89 ±9,19) years old,Stanford type B has 11 cases,the average LVEF is (49.05± 2.39 ) %,average age is ( 60.09 ± 5.32 ) years old.The LVEF have statistical differences (P<0.05) ,ages have no statistical differences (P>0.05).Conclusions:(1)256 CT cardiac function determination can accurately reflect the LVEF of acute AD patients.(2) Amone the acute AD patients LVEF reduced are in the majority. The determination of 256 slice spiral CT LVEF can be a reference index for clinical of early intervention in cardiac function.(3) Different Stanford classification can cause different influence to the LVEF for the acute AD patients with LVEF<60%.