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| Characteristics of left ventricular strain rate imaging during isovolumic relaxation period in normal subjects |
| SONG Yan, QIAN Yun-qiu, ZHANG Hai-bin, LI Hong-ling, LIU Li-wen, ZHENG Min-juan, CUI Kai |
| Ultrasound Division, Xijing Hospital, Fourth Military Medical University, Xi’an 710032, China |
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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.
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Received: 27 December 2005
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2006, Vol. 17 
