Research On The Evaluation Of The Heart Function Of The Arotic Valve Replacement Patients By The VVI Technique

Objective: Practice of quantitative evaluation to myocardial systolic and diastolic function of aortic stenosis patients before and after operation by technique of the Velocity Vector imaging. Data of ordinary person was obtained as a comparison to reveal the heart functional characteristics and the change of the heart function of post aortic valve replacement surgery was observed at the same time. At the end of the study, a brief conclusion about the value of the non-invasive measurement, the VVI technique, and be made, especially in the realm of assessment of the systolic and diastolic heart function of the patient after the aortic valve replacement surgery.Methods: 32 aortic stenosis patients received the Aortic Valve Replacement surgery (during 2007.5--2008.1 in the 2nd Xiangya Hospital) were observed who have no coronary disease and arrhythmia, no other valve disease(by B-ucg) and EF>55%. Another 32 ordinary people were selected as a contrast group by corresponding sex and age. Those patients who have history of coronary artery disease, hypertension, congenital heart disease and who were proved suffering diabetes, thyroid disease, metabolic disease, connective tissue disease, malnutrition, severe hepatic and renal dysfunction, drug and alcoholic abuse, and in periodical period. Three kind of data on the 16-segment-myocardium were measured by the VVI technique: I -systolic apex strain, systolic apex strain rate(Ss) II -diastolic apex strain (Sd), diastolic apex strain rate (SRd); III - peak time of strain(PTS), peak time of strain rate(PTSR). Each data is taken from single heart cycle.Results: The systolic and diastolic S and SR of long-axis myocardium of the aortic patients before surgery are significantly lower than the ordinary group(P<0.05). The consistence of PTS and PTSR in the 16 segments is good, but the segments are longer than the ordinary group(P<0.05). The myocardial systolic and diastolic S and SR of post surgery patients are higher than those before surgery while lower than the ordinary group.(P<0.05) The consistence of PTS and PTSR in the 16 segments is good and the length of the segments are longer than the ordinary group (P<0.05)while there is no difference to the data before surgery.Conclusion: The VVI technique can reveal the small changes of function of the long-axial myocardium objectively and accurately. It is a new kind of non-invasive and credible measurements which can evaluate heart function accurately and the recovery of heart function and the fellow-up. It will be widely used in clinical work with more understanding of its characteristics.