Abstract：Objective: To investigate longitudinal strain rate during isovolumic relaxation period of left ventricle(LV) in normal subjects by strain rate imaging(SRI). Methods: The LV wall was divided into six walls and each wall into three segments. SR-Time waves were observed. Both positive and negative peak strain rate in isovolumic relaxation period were measured(SRIVR+, SRIVR-). They were corrected by peak strain rate of systolic and early relaxation period respectively(SRIVR+/SRE, SRIVR-/SRS). Time data were also measured. All the parameters were compared among different walls and segments. Results: There were four modes of movement during isovolumic relaxation period. Most segments relaxed. There’s no significant difference in SRIVR+ among walls, while from basal to apical level, SRIVR+ decreased. SRIVR+ correlated well with age. Other segments had contracting waves. SRIVR- was larger in interventricular septal walls. From basal to apical level, SRIVR- also decreased. SRIVR- in apical level correlated with age significantly. Conclusions: Relaxation and contraction of LV wall in normal subjects during isovolumic relaxation period can be quantitatively evaluated by SRI, which may be the base of further study on dysfunctional myocardium.
宋 艳;钱蕴秋;张海滨;李红玲;刘丽文;郑敏娟;崔 凯. 应变率成像技术评价正常左室壁等容舒张[J]. , 2006, 17(10): 563-565.
SONG Yan;QIAN Yun-qiu;ZHANG Hai-bin;LI Hong-ling;LIU Li-wen;ZHENG Min-juan;CUI Kai. Characteristics of left ventricular strain rate imaging during isovolumic relaxation period in normal subjects. , 2006, 17(10): 563-565.
2006, Vol. 17 
