Study On Renal Vascular Conditions Using Color Doppler Ultrasound And Three-Dimensional Color Power Angiography In Hypertensive Patients

Objective: To discuss the clinical application of color doppler ultrasound and three-dimensional color power angiography (3D—CPA) in diagnosing renal vascular damage in hypertensive patients. Methods: A total of 104 patients were divided into three groups: hypertensive group I (36 patients), hypertensive group II (32 patients) and normal group(36 patients). Observed the renal blood flow distribution conditions using color doppler ultrasound, and recorded their blood flow parameters such as peak velocity in systole (V_max , the end-diastolic velocity (V_min), resistive index (RI), pulsed index (PI)and acceleration (Accel) using pulsed doppler ultrasound. Then observed the renal bloodflow distribution conditions and collect the three-dimensional pictures by 3D — CPA. Reconstructed the kidney models by three-dimensional picture-reconstruction system (GRASS BODY) and calculated the parameters such as vascularization index (VI), flow index (FI) and vascular flow index (VFI). Statistical software SPSS for windows 13.0 was used to analys(?) the differences of RI, PI, VI and FI among different groups. Results: The renal blood flow distribution conditions showed as follows: normal group mostly showed as type I and some as type II, hypertensive group I showed as type II and type III with type II accounted for 44.4%, hypertensive group II showed as type III and type IV with almost the same percentage. Along with the increase of blood pressure, RI and PI showed an increase tendency while V_max, V_min and VI, FI, VFI showed a decrease tendency. And there were differences among three groups (normal group, hypertensive group I and hypertensive group II, P<0.01 or P<0.05). Besides, there was significant difference between hypertensive and healthy people. Using the VI more than 5. 5 percent as a standard for predicting vascular damage in hypertensive, the sensitivity and specificity were 76. 5% and 72. 2%. While using the FI more than 38 as a standard the sensitivity and specificity were 86. 8% and 72. 2%.Conclusion: Three-dimensional color power angiography can show the renal vasculature and blood flow distribution conditions more clearly than color doppler ultrasound, and they were useful in the non—invasive diagnosis and evaluation of early renal vascular damage of hypertensive. The changes of RI, PI and VI, FI of renal vasculature may provide objective information for estimating early renal vascular damage in hypertensive.