Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital, Kita15, Nishi 7, kita-ku, Sapporo, Japan.
Eur Radiol. 2011 Nov;21(11):2362-8. doi: 10.1007/s00330-011-2177-4. Epub 2011 Jun 18.
To investigate whether subendocardial and transmural myocardial infarction can be identified and differentiated using the peak circumferential and longitudinal strains measured by fast strain-encoded (SENC).
Nineteen patients with ischemic heart diseases underwent imaging with fast SENC and late gadolinium enhancement (LGE) MRI at 3 T. Fast SENC measurements were performed in three short-axis slices (basal, mid-ventricular and apical levels) and one long-axis view (four-chamber) to assess peak longitudinal and circumferential systolic strains.
All patients showed myocardial infarction with an average of 7 positive LGE segments. A total of 304 segments for longitudinal strains (LS) and 114 segments for circumferential strains (CS) could be analysed. Positive LGE segments showed lower peak CS and LS compared with the no LGE segments (P < 0.0001 for both). Segments with subendocardial infarction showed reduced CS and LS compared with the no LGE segments (P < 0.0001 for both). There was a significant difference in CS between subendocardial and transmural infarct segments (P = 0.03), but no significant difference in LS between them (P = 0.64).
Fast SENC can identify old myocardial infarction and differentiate subendocardial from transmural infarction.
利用快速应变编码（SENC）测量的峰值环向和纵向应变来探讨是否可以识别和区分心内膜下和透壁性心肌梗死。
19 例缺血性心脏病患者在 3T 磁共振仪上进行快速 SENC 和钆延迟增强（LGE）成像。在三个短轴层面（基底、中-心室和心尖水平）和一个长轴层面（四腔）进行快速 SENC 测量，以评估峰值纵向和环向收缩应变。
所有患者均显示心肌梗死，平均有 7 个阳性 LGE 节段。共可分析 304 个节段的纵向应变（LS）和 114 个节段的环向应变（CS）。阳性 LGE 节段的峰值 CS 和 LS 均低于无 LGE 节段（均 P<0.0001）。心内膜下梗死节段的 CS 和 LS 均低于无 LGE 节段（均 P<0.0001）。心内膜下和透壁性梗死节段的 CS 存在显著差异（P=0.03），但 LS 无显著差异（P=0.64）。
快速 SENC 可识别陈旧性心肌梗死，并可区分心内膜下和透壁性梗死。
