A Technology A-SMA To Normal Heart Function In Unimpaired Children

In the process of Continued growth and development of the childhood, all the organs and tissues gradually grow up, the cardiovascular system will also be changed, function matures. So the puerile normal ranges of the heart functional parameters in different periods are also different, the evaluation of abnormal cardiac function in the different age groups of children must adopt diagnostic criteria with corresponding age. Therefore defination of a relatively constant standard with the corresponding age can make accurate judgements of cardiac function. Clinical judgement on cardiac function in patients with abnormal heart is very importantfor the evaluation of the damage. The pediatric clinical assessment of cardiac function of children often based on the symptoms and signs, there are some subjectivities. Because children have unclear statements of the symptoms and are influenced by the original disease, the diagnosis of cardiac function in children is often easy to be neglected and clinical treatment is difficult to accurately grasp the opportunity, easy to delay the condition. Hence the need to adopt an objective clinical parameters can improve the diagnostic sensitivity and specificity.In the evaluation of cardiac structure and function, echocardiography is the most commonly used in the clinical study of the testing facility. With the continuous development of new technologies of echocardiography, some of the new left ventricular function evaluation methods and clinical indicators are gradually applied, and a growing emphasis on the role have occupied an important position, because not only these new technologies can be judged as a whole and local function of left ventricular, but also they can also detect systolic and diastolic function.As a newly developed technology, A-SMA technology is based on a "organizations-blood interface" automatic detection technology. The technology has the function which can dectect endocardial automatic edge, according to the different points of Integral Backscatter of the myocardium and blood ,it can automatically detect in real time with the blood of myocardial tissue interface, which can complete endocardial automatic edge detection. Transform and gradeing by color coding which can show the heart of endometrial changes in the diferent phrase can make the quantitative detection to the fractional area change (FAC) and fractional area change-total (FAC-T) per cardiac cycle. Left ventricular time-volume curve and its derivative curve acompanied with each cardiac cycle automatically calculate and display, it can obtain a number of cardiac function parameters in a continuous cardiac cycle: normalization peak filling rate (nPFR) and normalization peak ejection rate (nPEP). A-SMA technology is a technology of quantitative analysis,it not only give an objective quantitative evaluation of the overall cardiac function, can also directly show that local abnormal movement. As A-SMA technology can make a real-time quantitative analysis of heart function, it is a new clinical technology which is convenient, time - saving, quantitative and objective ,at the same time ,it can make a real- time dynamic monitor on cardiac function. A-SMA technology which can make a quantitative analysis of local wall motion can automatically display measurements in real time, it does not frozen images and overcome the the cumbersome procedures of repeated operation.it reduces the the human factors which impact the accuracy in the manual operation, it also significantly increases working efficiency and accuracy of the inspection.Free angle model (FAM), also known as anatomy, anatomy linear M-mode echocardiography. There is no limitation in the angles and positions of its sampling with the largest differences from the traditional M-model. we can make a comprehensive quantitative detection of all wall segments from any direction and angle, and in the regional wall, thickness, the range of motion and the rate of thickening were observed which we can evaluate local systolic and diastolic function. FAM overcome M-mode constraints, and have improved precision and accuracy in the echocardiographic measurement. The greatest advantage lies in the sampling line 360°rotation, which can be sure to vertically pass the relevant structure, improve the accuracy and repeatability in measuring partial wall thickness, range of motion and the rate of thickening to evaluate local systolic and diastolic function.This study used Aloka SSD 5500 color ultrasonic machine, with A-SMA, FAM analysis software, and detection of 160 healthy children. Start A-SMA system, in the level of the left ventricular, mitral valve of short axis and papillary muscle of short axis were divided into six equal wedge region, the short axis of cardiac apical level is divided into four equal wedge region.A-SMA observation shows that the Kinesis color changes, and to detect the fractional area change-systolic (FAC-S) and the fractional area change-diastolic (FAC-D) in each region;the fractional area change-total (FAC-T) of the level systolic and diastolic phase shows in the form of histograms and data. Admission to the apical four-chamber view, the left ventricle time-volume curve and its derivative curve with each cardiac cycle automatically calculate and display, the use of the curve will obtain the following parameters: normalization peak filling rate (nPFR), normalization peak ejection rate (nPER), ejection fraction (EF), end diastolic volume (EDV), end systolic volume (ESV). FAM analysis system set three ultrasound sampling line, in the same cardiac cycle make the six-segment Kinesis curve at the same time, measure the maximum range of motion in the systolic wall.The results of this study show that: the normal range with normal puerile left ventricular EDV and ESV increases with age, four groups between children have the significant difference. In the left ventricular nPFR all age groups showed an increase, in the Group 4, it has significant changes with an increasing trend with increasing age. Normal children A-SMA wall motion color will change with cardiac cycle, the all left ventricular wall can change in the order of a certain color s and complete uniformity. In the group of normal children ,left wall FAC-S and FAC-D from the basement to apical segment have a reducing trend, those of the basement of left wall is more than of the middle, but the difference was not significant; those of the middle is more than of the apex, the difference was highly significant or has significance. Tip basement wall of the left ventricular short axis and the middle suggest that have the greater influence on the overall function, and apex have the lest influence. Children with left ventricular fraction of FAC-T has to change with age and the growth trend. Within each group FAC-T in the short axis view at the mitral valve level is greater than the short axis view at the papillary muscle level, but the difference was not significant; the short axis view at the papillary muscle level is greater than the Short axis view at the apex level, the difference was significant. which suggest that the overall function of the three plane in the left ventricular short axis direction and the plane of apex of heart in the short axis direction are weakest.A-SMA and FAM technology can be combined with comprehen- sive quantitative detection of children with normal heart function, in- cluding heart of the overall and partial systolic and diastolic function, and they construct the reference values of relevant indicators. So it provides the children with the new objective indicators of normal clinical cardiac function which settled foundation for further research on children's heart disfunction.