Research Progress on Vector Flow Imaging of Cardiac Ultrasound / 中国医疗器械杂志

Echocardiogram is vital for the diagnosis of cardiac disease. The heart has complex hemodynamics requiring an advanced ultrasound imaging mode. Cardiac ultrasound vector flow imaging is capable of measuring the actual magnitude and direction of the blood flow velocity, obtaining the quantitative parameters of hemodynamics, and then providing more information for clinical research and diagnosis. This study mainly reviewed several different vector flow imaging techniques for cardiac flow and presented the implementation difficulties, and proposed a diverging wave based high frame rate cardiac ultrasound vector flow imaging. The study discussed the limitation of current ultrasound technology used in the cardiac flow measurement, analyzed and demonstrated the specific reasons for these implementation difficulties and the potential future development.

Application of the mixture solution of crystalloid and colloid at varied ratio to acute hemodilution / 中华麻醉学杂志

To find the crystalloid and colloid mixture solution in proper ratio for acute hemodilution.Method:Fourty major surgical adult patients undergoing acute hemodilution were randomly divided into five groups (n=8). The average amounts of blood withdrawn were 20％-30％ of total blood volume. The general anesthesia was maitained,the blood was drawn through left radial artery, and in the meanwhile at the same volume one of the designed diluents was infused intravenously: Single crystalloid or colloid solution,mixture of crystalloid and colloid solution in proportion of 1:1:1:2 and 1:3. Result:Hemodynamics,ECG,SpO_2 P_EtCO_2 remained stable; Hb,Hct,PLC,Fg and blood viscosity decreased significantly following hemodilution in all groups. COP decreased significantly in single crystalloid, 1:1 and 1:2 groups, and remained unchanged in 1:3 and single colloid groups. Conclusion:The crystalloid and colliod mixture at ratio of 1:3 can be more safely applied to acute hemodilution.