武汉同济医院夏黎明 Assessment of coronary microvascular dysfunction in hypertrophic cardiomyopathy: first-pass myocardialperfusion cardiovascular magnetic resonance imaging at 1.5 T.

Clin Radiol. 2013 Jul;68（7）:676-82. doi: 10.1016/j.crad.2013.01.003. Epub 2013 Apr 6.

Assessment of coronary microvascular dysfunction in hypertrophic cardiomyopathy: first-pass myocardialperfusion cardiovascular magnetic resonance imaging at 1.5 T.

Huang L¹, Han R, Ai T, Sun Z, Bai Y, Cao Z, Morelli JN, Xia L.

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Abstract

AIM:

To evaluate the integrity of the coronary microvasculature in patients with hypertrophic cardiomyopathy （HCM） using first-pass magneticresonance perfusion imaging.

MATERIALS AND METHODS:

Twenty-two patients with HCM and 13 healthy volunteers underwent cardiac magnetic resonance imaging （CMR） at rest. Imaging protocols included short axis cine, first-pass myocardial perfusion, and late-phase contrast-enhanced imaging. Left ventricular end-diastolic wall thickness （EDTH）, myocardial thickening, maximal upslope of time-intensity curve （slopemax）, and late myocardial gadolinium enhancement （LGE） were assessed for each myocardial segment. The differences in slopemax, myocardial thickening, and EDTH between healthy volunteers and HCM patients were evaluated as were differences among hypertrophic segments of different severities （mild, moderate, and severe hypertrophy） in a one-way analysis of variance analysis. The differences in slopemax, myocardial thickening, and EDTH between the segments with and without LGE were compared by independent-sample t-test. A Pearson correlation test was used to determine the relationships between slopemax, EDTH, and myocardial thickening.

RESULTS:

Slopemax was statistically significantly less in HCM patients; the degree of myocardial thickening was also significantly reduced （p < 0.001）. Slopemax and the degree of thickening statistically significantly decreased with increasing degrees of myocardial hypertrophy （p < 0.05）. Differences in slopemax, myocardial thickening, and EDTH were observed between segments with and without LGE （p < 0.05）. Slopemax andmyocardial thickening were negatively correlated with EDTH.

CONCLUSION:

First-pass myocardial perfusion CMR with slopemax measurements demonstrates microvascular coronary dysfunction in patients with HCM, a determination that may aid in risk stratification, therapeutic planning, and determination of prognosis for HCM.

Copyright © 2013 The Royal College of Radiologists. Published by Elsevier Ltd. All rights reserved.

PMID: 23566329 DOI: 10.1016/j.crad.2013.01.003 [PubMed - indexed for MEDLINE]