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BioMed Research International
Volume 2015, Article ID 579639, 7 pages
http://dx.doi.org/10.1155/2015/579639
Research Article

A New Approach Using Manganese-Enhanced MRI to Diagnose Acute Mesenteric Ischemia in a Rabbit Model: Initial Experience

Department of Radiology, Institute of Surgery Research, Daping Hospital, Third Military Medical University, Chongqing 400042, China

Received 13 May 2015; Accepted 28 September 2015

Academic Editor: Giuseppe Rubini

Copyright © 2015 Da-wei Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. Manganese-enhanced MRI (MEMRI) has been applied to a wide range of biological and disease research. The purpose of the study was to use MEMRI to diagnose the acute mesenteric ischemia (AMI). Methods. The institutional experimental animal ethics committee approved this study. To optimize the dose of Mn2+ infusion, a dose-dependent curve was obtained using Mn2+-enhanced T1 map MRI by an intravenous infusion 2.5–20 nmol/g body weight (BW) of 50 nmol/L MnCl2. The eighteen animals were divided into control, sham-operated, and AMI groups. AMI models were performed by ligating the superior mesenteric artery (SMA). T1 values were measured on T1 maps in regions of the small intestinal wall and relaxation rate (ΔR1) was calculated. Results. A nonlinear relationship between infused MnCl2 solution dose and increase in small intestinal wall ΔR1 was observed. Control animal exhibited significant Mn2+ clearance over time at the dose of 15 nmol/g BW. In the AMI model, ΔR1 values (0.95 ± 0.13) in the small intestinal wall were significantly lower than in control group (2.05 ± 0.19) after Mn2+ infusion (P < 0.01). Conclusion. The data suggest that MEMRI shows potential as a diagnostic technique that is directly sensitive to the poor or absent perfusion in AMI.