Study On The Clinical Diagnostic Value Of Two Non-invasive Examination Methods In Coronary Heart Disease

ObjectiveConsidering the real condition and clinical practice in our hospital, the objectives of this series of studies were to assess the diagnostic values of two non-invasive methods including electrocardiography (ECG) and two-dimensional echocardiography (2-DE) in diagnosing coronary heart disease (CHD).BackgroundCoronary angiography (CAG) is the most reliable method to diagnose CHD at present, but it cannot be accepted by a lot of people because it is an invasive examination, and also limited by equipment and condition. So it is a valuable topic to explore the effective non-invasive methods. Nowadays, there are many non-invasive methods of assessing CHD, but which is most accurate and which is most applicable? How to combine them together to achieve best results? Though some persons have made great efforts before, their results vary a lot because of the differences of exponent sources and errors of experimental methods. In another words, it is very difficult to draw conclusion, a lot of research works are demanded in this area.Methods55 patients who have been diagnosed CHD or suspected CHD were examined at the same time by ECG and 2-DE, the ECG is that of attacking cardiac angina or that one week before CAG, the duration of 2-DE and CAG was less than two weeks. The resultsof ECG and 2-DE were compared with that of CAG. Suspect correlating coronary arterial lesion; apply ultrasonic-cardiography to detect left ventricular systolic and diastolic function.Results1 There are no statistical differences in age, heart rate, blood pressure and blood sugar between two groups patients.2 The sensitivity in the diagnosis of CUD with ECG and 2-DE were 64.71% and 70.59% (P>0.05) respectively, the specificity were66.67% and 95.24% (P<0.05) respectively, the sensitivity of ECG and 2-DE was irrelative to the counts of coronary arterial lesion. It was proved by statistics the coincidence rate of these two methods was 85.45%.3 The abnormal changes of Vi-e leads on ECG and RWMA of anterior wall, anterior septation, middle interventricular septum and apex of heart on 2-DE often point out LAD's lesion, those of 11, 111, avF leads and RWMA of inferior wall and posterior wall cue LCX or RCA pathological changes.4 The indexes of reflecting left ventricular systolic function EF, SV, CO, FS and reflecting left ventricular diastolic function E/A all descent, there is a significant difference, P<0.05.ConclusionECG and 2-DE had high sensitivity and specificity, they were two safe and low cost methods to be worth extending. They are especially served those patients who cannot do CAG examination to diagnose CHD early. According to the abnormal position of ECG and 2-DE, we can infer the pathological coronary artery, moreover the cardiac indexes of 2-DE are used to evaluate cardiac function of CHD patients. Combining to several indexes of ECG and 2-DE, we'll have overall cognition in the diagnosis of CHD andhelp to guide treaty.