Assessment of left ventricular twist in type 2 diabetes mellitus by using two-dimensional ultrasound speckle tracking imaging / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To evaluate the left ventricular twist characteristics in patients with type 2 diabetes by using two-dimensional speckle tracking imaging (STI).</p><p><b>METHODS</b>Ninety-three patients with type 2 diabetes admitted in Zhejiang Hospital from May 2012 to September 2013 were enrolled. According to left ventricular ejection fraction (LVEF), patients were divided into two groups: normal left ventricular systolic function group (group A, LVEF≥0.50, n=46) and abnormal left ventricular systolic function group (group B, LVEF <0.50, n=47). Forty-six healthy subjects were selected as normal controls. STI was applied to quantitatively analyze the left ventricular twist. Correlation of the peak of left ventricular twist angle (Peaktw), aortic valve closure time twist angle (AVCtw), and mitral valve opening time twist angle (MVOtw) with LVEF, Tei index, E/A, and E/e was evaluated. Consistency check for STI was conducted to assess its stability and reliability.</p><p><b>RESULTS</b>The Peaktw, AVCtw, and MVOtw in group A were significantly elevated than those in normal controls (P<0.05). The Peaktw, AVCtw, and MVOtw in group B was lower than those in normal controls and group A (P<0.05). In diabetic patients, the Peaktw, AVCtw, MVOtw were positively correlated with LVEF (r=0.968, 0.966, 0.938;P<0.05) and E/A (r=0.798, 0.790, 0.788; P<0.05), and were negatively correlated with Tei index (r=-0.834, -0.811, -0.797; P<0.05) and E/e (r=-0.823, -0.805, -0.771; P<0.05). The agreement between measurers and within measurers of Peaktw was satisfactory (between measurers: R=0.957, bias=-0.1, 95% consistency limit=-2.8-2.7; within measurer: R=0.964, bias=-0.2, 95% consistency limits=-2.7-2.2).</p><p><b>CONCLUSION</b>STI can be used for early recognition of abnormal changes of cardiac function in type 2 diabetic mellitus patients, with high stability and reliability.</p>

Two-dimensional ultrasound speckle tracking imaging in detection of myocardial torsion for patients with chronic pulmonary heart disease / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To evaluate the application of two-dimensional ultrasound speckle tracking imaging (STI) in assessment of myocardial torsion and left ventricular function for patients with chronic pulmonary heart disease (CPHD).</p><p><b>METHODS</b>Thirty six patients with CPHD and 38 normal subjects were enrolled in the study,and STI examinations were performed. The left ventricular short-axis views (mitral level,apical level) were observed,the rotation angles of the standardized time point were measured at each short-axis views and the corresponding left ventricular torsion angles were calculated. Simultaneously, the basal rotation peak, apical rotation peak, left ventricular twist peak, end-systolic basal rotation value, end-systolic apical rotation value and end-systolic left ventricular twist value were recorded. The correlations of left ventricular ejection fraction (LVEF) with left ventricular torsion peak, end-systolic left ventricular twist value in patients were analyzed.</p><p><b>RESULTS</b>Compared to normal controls, the basal rotation peak, apical rotation peak, left ventricular twist peak, end-systolic basal rotation value, end-systolic apical rotation value and end-systolic left ventricular twist value were significantly lower (P<0.01) in CPHD patients. The LVEF was highly correlated with left ventricular twist peak and end-systolic left ventricular twist value in CPHD patients (r=0.967, 0.952,P<0.001).</p><p><b>CONCLUSION</b>STI is sensitive to detect left ventricular myocardial torsion change; left ventricular torsion peak and end-systolic left ventricular twist value can be used to assess the left ventricular function in patients with CPHD.</p>

Evaluation of left ventricular systolic asynchrony in patients with uremic myocardiopathy using tissue synchronization imaging / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To evaluate the left ventricular systolic asynchrony in patients with uremic myocardiopathy (UM) using tissue synchronization imaging (TSI).</p><p><b>METHODS</b>Ultrasound system with TSI and Q-analyze software were used. Thirty-five patients with UM were enrolled in the study,and thirty normal subjects were included as the control group.</p><p><b>RESULT</b>The total and mean time to peak velocity (Tc) corrected by the heart rate of all segments in UM group were longer than those in the control group (P<0.05), and the time to peak velocity of most segments in UM group was also longer (P<0.05). Delayed time to peak velocity was found in 175 (175/420) segments in UM group and left ventricular systolic asynchrony was detected in 65.7% (23/35).</p><p><b>CONCLUSION</b>TSI can detect the ventricular systolic asynchrony in patients with uremic myocardiopathy and provide reliable parameters for clinical management.</p>

Enhanced reporter gene transfer and expression in cardiac myocytes mediated by ultrasonic destruction of the microbubbles / 中国应用生理学杂志

<p><b>AIM</b>To determine if the diagnostic ultrasound and self-made microbubbles could be used to increase gene transfection and expression in cardiac myocytes by means of the ultrasound-mediated microbubbles destruction.</p><p><b>METHODS</b>The perfluoropropane-exposed sonicated dextrose albumin(PESDA) microbubbles were made and mixed with indicated volume reporter gene encoding beta-galactosidase prior to gene transfection. Gene transfection into the cultured cardiac myocytes was performed by exposure to the various intense diagnostic ultrasound (1.3 MHz) in the presence of the gene-attached microbubbles. The calcium phosphate precipitation gene transfection was carried out alone or in combination with ultrasound-mediated destruction microbubbles. The cells were harvested 48 h after transfection and beta-galactosidase expression was detected by in situ staining and quantitive assay.</p><p><b>RESULTS</b>Cardiac myocytes exposed to ultrasound with PESDA induced significantly increase in gene expression (60-fold compared with naked plasmids transfection, P < 0.01). Moreover, it was found that the reporter gene expression not only related with ultrasound intension but also with the microbubbles concentration. In combination with calcium phosphate precipitation gene transfection, ultrasound-mediated destruction microbubbles resulted in more intense gene expression even 6 hours after calcium phosphate precipitation gene transfection.</p><p><b>CONCLUSION</b>The ultrasonic destruction of gene-loaded microbubble is a highly effective gene transfer method, and it not only acts on the gene entry into cells, but also on the intracellular exogenous DNA expression.</p>

Ultrasonic diagnosis of isolated noncompaction of the ventricular myocardium in adults / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To apply echocardiography in diagnosis of isolated noncompaction of ventricular myocardium (INVM) in adults.</p><p><b>METHODS</b>Six patients with INVM underwent echocardiographic examination using HP5500 ultrasound system with the frequency of 2 approximately equals 4 MHz, and the observation was focused on ventricularmyocardium and endocardium at one-third of the apex.</p><p><b>RESULTS</b>All 6 patients showed typical echocardiographic images characterized by an altered structure of the ventricular myocardium with extremely thickened, hypokinetic segments consisting of two layers: a thin, compacted epicardium and an extremely thickened endocardium, resulting in an extremely thickened ventricular wall.</p><p><b>CONCLUSION</b>Echocardiography should be the first choice to be applied in diagnosis of INVM, which is a distinct entity of specific cardiomyopathy in adults.</p>

Prognostic value of Doppler transmitral filling patterns in patients with chronic heart failure / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Chronic heart failure is a significant cause of cardiovascular morbidity and mortality. This study tested the hypothesis that restrictive filling pattern may provide useful prognostic data for identifying patients with chronic heart failure at high risk of all-cause cardiac death.</p><p><b>METHODS</b>Ninety patients with chronic heart failure [70 men and 20 women, mean age (58.1 +/- 11.6) years] were investigated and followed for (18.8 +/- 7.9) months. During this period, 14 patients died of progressive pump failure, 12 patients underwent heart transplantation, 5 patients died suddenly, and 2 patients died of acute myocardial infarction. A new criterion, the restrictive filling index (RFI), was designed to subgroup patients into a restrictive and a nonrestrictive group.</p><p><b>RESULTS</b>Patients with restrictive filling pattern had a more severe left ventricular dysfunction and a higher cardiac mortality. Analysis by the Kaplan-Meier method revealed that patients in the RFI > or = 1 and RFI < 1 groups had a cardiac events-free survival rate of 52% versus 94% at 1 year, and 27.5% versus 92% at 2 years, respectively. The multivariate Cox proportional hazard model selected RFI as the most powerful prognostic factor (chi(2) = 8.8017, P = 0.0030) for all-cause cardiac death.</p><p><b>CONCLUSION</b>These results indicate that RFI is a simple, noninvasive, and specific clinical predictor for adult chronic heart failure patients who are at a high risk for all-cause cardiac death.</p>