Abnormal Myocardial Perfusion in Hypertrophic Cardiomyopathy: Preliminary Findings of a Cardiovascular MRI Study

Authors

James A. White, University of Western OntarioFollow
Sarah Armstrong, University of Western Ontario
Mohammed Al-Admawi, University of Western OntarioFollow
Sherryn Rambihar, University of Western Ontario
Gerald Wisenberg, University of Western OntarioFollow
Ivonna Verschuur, University of Western OntarioFollow
Anna MacDonald, University of Western Ontario
Cyndi Harper-Little, Robarts Research Institute
Aaron So, Robarts Research InstituteFollow
Ting-Yim Lee, Robarts Research InstituteFollow
Frank Prato, University of Western OntarioFollow
Terry Thompson, University of Western OntarioFollow

Document Type

Article

Publication Date

1-28-2009

Abstract

Background: Reduced myocardial perfusion has been speculated as a potential mechanism for the development and/or propagation of myocardial fibrosis in hypertrophic cardiomyopathy (HCM). This study aims to evaluate the prevalence, distribution and extent of stress-induced perfusion abnormalities and their relationship to underlying fibrosis in patients with HCM using magnetic resonance imaging.

Methods: 15 patients with echocardiographically diagnosed HCM have been enrolled. Cine imaging, first-pass stress perfusion imaging using vasodilator stress (Dipyridamole), and delayed gadolinium enhancement imaging were performed. Stress hypoperfusion and delayed enhancement images were assessed both quantitatively and visually using a 16-segment model. Conversion of segmental visual scoring to % of LV by volume was achieved for both hypoperfusion (HP) and late enhancement (LE) using a standardized scoring system. For quantitative assessment prospectively defined cut-offs for LE and HP were used.

Results: Maximal wall thickness ranged from 13 to 22 mm (mean 17 ± 2.6 mm). Non-ischemic pattern LE was present in 70% of patients. Perfusion abnormalities were identified on stress perfusion images in 80% of patients using visual analysis and 87% of patients using quantitative analysis. Perfusion abnormalities were predominantly subendocardial, and were regionally associated with segments containing LE (p < 0.01). Mean percent HP and mean percent LE were 17 ± 8.4% and 10 ± 9.3%, respectively by visual estimation and 20.0 ± 12.1% and 14.0 ± 7.4%, respectively by quantitative assessment. Figure 1.

Conclusion: These preliminary results suggest that patients with HCM have a high prevalence of stress-induced myocardial hypoperfusion as represented by reduced first-pass gadolinium enhancement during vasodilator stress. This hypoperfusion appears to extend beyond regions of established LE suggesting a potential contribution of ischemia in the development and/or propagation of myocardial fibrosis in patients with HCM.

Notes

Published in: Journal of Cardiovascular Magnetic Resonance 2009, 11(Suppl 1):P55 (doi:10.1186/1532-429X-11-S1-P55). The electronic version of this abstract is the complete one and can be found online at: http://jcmr-online.com/content/11/S1/P55