Objective To evaluate the application value of three-dimensional speckle tracking imaging (3D-STI) in quantitatively evaluating the left ventricular global strain in recipients within 3 months after renal transplantation. Methods Clinical data including blood pressure, serum creatinine and tacrolimus blood concentration of 34 renal transplant recipients were collected before operation, 7 d, 1 month and 3 months after operation, respectively. Meanwhile, conventional echocardiography and 3D-STI examination were performed. Echocardiographic parameters [left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVESV) and left ventricular ejection fraction (LVEF)] and 3D-STI parameters [left ventricular global peak longitudinal strain (GPLS), global peak circumferential strain (GPCS), global peak radial strain (GPRS) and global peak area strain (GPAS)] of recipients were collected. The changes of these parameters before operation, 7 d, 1 month and 3 months after operation were statistically compared. The changing characteristic and application value of 3D-STI in quantitatively evaluating the left ventricular global strain in recipients within 3 months after renal transplantation were evaluated. Results LVEF and GPCS did not significantly differ at different time points (all P > 0.05), whereas LVEDV, LVESV, GPLS, GPAS and GPRS significantly differed at different time points from preoperative to within postoperative 3 months (all P < 0.001). GPLS, GPAS and GPRS trended to decline within postoperative 1 month, and slightly increased at 3 months after operation, which was still lower than the preoperative levels. Conclusions Application of 3D-STI may sensitively detect the changes of left ventricular global strain in recipients after renal transplantation when no significant variations are observed in postoperative LVEF. Compared with conventional echocardiography, 3D-STI may more accurately evaluate the changes of left ventricular global strain in recipients after renal transplantation.

Objective:To investigate the effect of 300 m saturation diving at sea on tremor intensity of divers’ finger.Methods:The finger tremor intensities of four divers were measured before entering pressurization chamber, during increasing pressurization, and at the stable stage of 300 m saturation pressurization.Results:The mean values of the tremor intensities of the divers’ fingers during the period from entering the chamber and starting pressurization to the stable stage of 300 m pressurization were higher than that before pressurization; specifically, the increases of tremor intensity of the divers’ fingers were the most significant at 250 m, 270 m, and 290 m pressurization ( P<0.05). However, there was no statistically significant difference in the mean value of the finger tremor intensities between that before pressurization and those at 195 m, 220 m, 250 m, 300 m pressurization, and during the 24 h-stay at the 300 m saturation pressurization ( P>0.05). Conclusion:The monitoring of finger tremor intensity in saturation diving at each pressurization stage can objectively and quantificationally evaluate the onset and development of high-pressure neurological syndrome (HPNS), which, combined with the traditional evaluation method, can provide a basis for improving the saturation diving pressurization rate and ensuring the safety of divers.

Objective:To investigate the effect of 300 m saturation diving at sea on tremor intensity of divers’ finger.Methods:The finger tremor intensities of four divers were measured before entering pressurization chamber, during increasing pressurization, and at the stable stage of 300 m saturation pressurization.Results:The mean values of the tremor intensities of the divers’ fingers during the period from entering the chamber and starting pressurization to the stable stage of 300 m pressurization were higher than that before pressurization; specifically, the increases of tremor intensity of the divers’ fingers were the most significant at 250 m, 270 m, and 290 m pressurization ( P<0.05). However, there was no statistically significant difference in the mean value of the finger tremor intensities between that before pressurization and those at 195 m, 220 m, 250 m, 300 m pressurization, and during the 24 h-stay at the 300 m saturation pressurization ( P>0.05). Conclusion:The monitoring of finger tremor intensity in saturation diving at each pressurization stage can objectively and quantificationally evaluate the onset and development of high-pressure neurological syndrome (HPNS), which, combined with the traditional evaluation method, can provide a basis for improving the saturation diving pressurization rate and ensuring the safety of divers.

Objective To analyze the motion, elastic and derived parameters of normal common carotid artery (CCA) wall in short-axis orientation with velocity vector imaging (VVI) technique. Methods Two-dimensional dynamic images of CCA in 40 healthy volunteers people were obtained in short-axis view with Siemens Acuson Sequoia 512 color Doppler ultrasound. The motion, elastic and derived parameters were analyzed in right CCA including 6 segments: Anterior wall, posterior wall, anterolateral wall, anterior internal wall, posterolateral wall and posterointernal wall. Relationship between these parameters and the influencing factors were analyzed as well. Results There was no statistical difference of the elastic parameters among 6 walls (P>0.05). Some of the motion parameters of the lateral wall and anterior wall were higher than those of the posterior wall and internal wall (P<0.05). Age and intima-media thickness were negatively correlated with some elastic parameters and some motion parameters (P<0.05). Heart rate were positively correlated with some elastic parameters and some motion parameters (P<0.05). Elastic parameters were positively correlated with motion parameters (P<0.05) and positive correlation was found between time to peak of elastic and motion parameters (P<0.05). Conclusion VVI is an effective technique for observing CCA mechanical characteristics of the movement in normal human, and has potential for studying some of related factors of the characteristics.

Objective To investigate the value of ultrasound integrated backscatter (IBS) in quantitative analysis of in-traluminal thrombus in abdominal aortic aneurysm (AAA).Methods IBS of intraluminal thrombus in 29 patients were measured,including All (average image intensity) and SDI (standard deviation of image intensity).Meanwhile,different echoes and characteristics of IBS in thrombus were compared and pathologic analysis was performed.Results ①Individual All value of homogenous thrombus differed remarkably,SDI value was low.There was no significant difference about All in homogeneous group and adjacent cavity group (P>0.05).All and SDI value in adjacent wall group were higher than those in other groups (P<0.01).②According to pathologic analysis,cellulose contents were abundant in adjacent wall group,but fewer in adjacent cavity group and homogeneous group.Conclusion IBS might be regarded as a sensitive and specific method and a quantitative basis for estimating and predicting the rupture risk of AAA.