In The Value Of Strain Rate Imaging In Patients With Essential Hypertension Quantitative Evaluation Of Left Atrial Function

Objective: To investigate the value of strain-rate imaging (SRI) in left atrial function evaluation in patients with essential hypertension.Methods: Patients were divided into healthy control group, hypertension group I (normal diameter of left atrial group , the left ventricular end systolic left atrial diameter (LAD) <3. 6cm) and hypertension group II (left atrial expansion group, LAD≥3. 6cm). There are 80 cases, 88 cases and 85 cases in healthy control group, hypertension group I and hypertension group II respectively, at an average old of 60.11±5.85, 61.22±4.93, 62.98±5.89. LAD, left atrial maximum volume (LAESV), left atrial volume before the beginning of contraction (LAPV), left atrial minimal volume (LAEDV), calculating the left atrial stroke volume (LASV) were measured by Philips iE33 color Doppler ultrasound imaging device (The Netherlands). Mitral flow velocity E, A, E / A, mitral annular diameter (d), left ventricular ejection fraction (LVEF), mitral A peak points (AVTI) and mitral valve flow total score (TVTI), calculate the left atrial filling fraction (LAFF), the spectrum of pulmonary venous systolic and diastolic peak velocity ratio of peak velocity (S / D), left atrial ejection force (LAF) were recorded on apical four-chamber. Left atrial strain rate was analyzed by QLAB software in TDI mode. The left atrial systole atrial septal, left atrial posterior wall peak strain rate and their average (SRa) were calculated after obtaining atrial septal and posterior wall of left atrial strain rate curve. Data was analyzed by SPSS13.0 statistical software, including multi-group comparison, one-way ANOVA and Pearson correlation analysis. P<0.05 value was considered to be statistically significant.Results: 1. LVEFs in the healthy control group, hypertensive group I,hypertensive group II have no statistically significant difference (P>0.05). E / A and S / D in the healthy control group with hypertensive group I have no significant difference (P>0.05), while E / A in hypertensive group II group was higher than that in the healthy control group and hypertensive group I (P<0.05); 2. LAESV, LAEDV in hypertension Group II was greater than that in the healthy control group and Hypertension group I (P<0.05), and there is no statistically difference between Hypertension group I and the healthy control group (P>0.05); LAPV, LASV in hypertension Group II was greater than Hypertension group I and healthy control group (P<0.05). An increased trend was observed in a healthy control group and Hypertension group I (P<0.05); 3.LAFF, LAF: Hypertension Group II; Hypertension Group I; control group, the differences were statistically significant (P<0.05); 4. Left atrial peak systolic strain rate (SRa) of hypertension I group was higher than the healthy control group , hypertension II group was higher than hypertension I group ( P<0.05), and the SRa of hypertension II group was higher than that in healthy controls (P<0.01); 5. A significant positive correlation was seen between SRa value and evaluation with traditional indicators of left atrial function (LAF) (r = 0.85, P<0.01).Conclusion: SRI can be used to quantitatively evaluate the left atrial function in patients with essential hypertension. As a new evaluation technology, SRI provides a new way to find the change in left ventricular diastolic function in patients with essential hypertension earlier.