Tissue characteristics of Microvascular obstruction
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BioMed Central
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Poster presentation
Tissue characteristics of Microvascular obstruction Masashi Kawade*1, Kunihiko Teraoka1, Yosinori Suzuki1, Yoshiaki Komori2, Kenji Takazawa1 and Akira Yamashina1 Address: 1Tokyo Med.University, Tokyo, Japan and 2Kyoto.University, Kyoto, Japan * Corresponding author
from 13th Annual SCMR Scientific Sessions Phoenix, AZ, USA. 21-24 January 2010 Published: 21 January 2010 Journal of Cardiovascular Magnetic Resonance 2010, 12(Suppl 1):P152
doi:10.1186/1532-429X-12-S1-P152
Abstracts of the 13th Annual SCMR Scientific Sessions - 2010
Meeting abstracts - A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/files/pdf/1532-429X-11-S1-infoThis abstract is available from: http://jcmr-online.com/content/12/S1/P152 © 2010 Kawade et al; licensee BioMed Central Ltd.
Introduction The mechanism of MO induction was discussed related to hemorrhage as result of reperfusion injury with reperfusion therapy, but the tissue characteristics of MO is not clear enough.
Purpose The purpose of this study was to evaluate the tissue characteristics of MO by comparing LGE image and T2* image taken at acute phase of the patients with acute myocardial infarction.
In all of MO-recognized cases with LGE image, MO was also recognized with T2* image showing low signal intensity. 2) The occupation ratio of MO to cross section of LV short axis in LGE image showed a significant highly correlation with the ratio in T2* image(5.8%,6.2%, r = 0.95) (Figure 1). 3) The circumferential and transmural extension of infarct area was bigger in MO-positive cases than negative cases significantly (p < 1.0 × 10 -13)
Method One hundred and fifteen AMI patients with successfully treated by reperfusion therapy within 17.3 ± 40.1 hours from onset was examined. Within 5.2 ± 2.6 days after reperfusion therapy, LGE image was taken at basal, midventricle and apical short axis view. Especially in 65 patients, T2*image was also taken. The occupation ratio of MO to cross section of left ventricle at each short axis view of LGE image and T2* image were calculated, and 1) the frequency of MO, 2)the relationship between MO and infarct size, CAG findings and regional wall motion in 6 month later from 1st CMR were examined.
Results 1) The infarct area showed LGE-positive in all cases, and MO was recognized in 63 cases of all 115 cases (54.8%).
4) The values of peak CK were significantly bigger in MOpositive cases than negative cases (p < 1.0 × 10 -11), also the points of Blush Grade were lower in MO-positive cases than negative cases (p < 1.0 × 10 -4). 5) The frequency of heart failure in hospital was significantly high in MO-positive cases than negative cases (p = 0.026). 6) Regional wall motion (% wall thickening) in infarct area did not improved significantly in MO-positive cases than negative cases(p < 0.05).
Conclusion MO was recognized with LGE-MRI in 54% patients with acute myocardial infarction treated with reperfusion therapy successfully. The siz
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