Clinical Study Of Central Arterial Pressure And Pulse Wave Evaluating By Ultrasound

Objective:To study the value of ultrasound in detecting central aortic pressure and pulse wave,analyzed factor on haemodynamics. Methods : 1. 35 patients who underwent cardiac catheterization were studied. The flow characteristic of arteriae aorta were measured by pulse Doppler echocardiography ( PDE ) .The correlation between the numerical value and catheter-measured central aortic pressure were studied. 2. 94 patients were studied using M-mode and pulse wave Doppler imaging. Aortic artery,upper extremity arteries and lower extremity arteries were individually measured.Then calculated time interval between initiation points in Q wave and M-mode wave form as well as flow spectrum and compared their index. 3. 31 healthy subjects entered the study. Every patient,resistive index (RI),pulsatility index(PI),systolic peak velocity(SPV),end diastolic velocity(EDV)were measured. And then compared the parameters value in different angles. Results:1. Some of the haemodynamics in arteriae aortic had correlation with mean arterial pressure (P<0.01). 2. In normal patients,velocity increasing of time interval using M-mode ultrasound was greater than pulse wave Doppler measurements(P<0.05), there is no obviously variability in those patients with coronary disease and arteriosclerosis(P>0.05). 3. RI,PI were found to have no difference,but the effect on SPV,EDV was very obvious. Conclusion:1. PDE is a new and noninvasive method of estimating CAP. 2. The affiliatied application of M-mode and pulse Doppler can be considered the more immetieder equipment,which dectected the pressure conduction and blood flow conduction in peripheral vascular. 3. We can neglect angle effect on RI,PI.