Late gadolinium enhancement on CMR significantly correlated with increased myocardial collagen (r = 0.7, p < 0.0001) but not myocardial disarray in a patient with hypertrophic cardiomyopathy.
Case Report (n=1)
Does late gadolinium enhancement on CMR correlate with histologic findings of collagen or disarray in a patient with hypertrophic cardiomyopathy?
Late gadolinium enhancement on CMR in a patient with HCM represents regions of increased myocardial collagen (fibrosis) rather than myocardial disarray.
Effect estimate: r = 0.7
p-value: p=< 0.0001
OBJECTIVES: We sought to identify the histologic basis of myocardial late gadolinium enhancement cardiovascular magnetic resonance (CMR) in hypertrophic cardiomyopathy (HCM). BACKGROUND: The histologic basis of late gadolinium CMR in patients with HCM is unknown. METHODS: A 28-year-old male patient with HCM and heart failure underwent late gadolinium enhancement CMR and, 49 days later, heart transplantation. The explanted heart was examined histologically for the extent of collagen and disarray, and the results were compared with a previous in vivo CMR scan. RESULTS: Overall, 19% of the myocardium was collagen, but the amount per segment varied widely (SD +/- 19, range 0% to 71%). Both disarray and collagen were more likely to be found in the mesocardium than in the endo- or epicardium. There was a significant relationship between the extent of late gadolinium enhancement and collagen (r = 0.7, p 15% collagen were more likely to have late gadolinium enhancement. Regional wall motion was inversely related to the extent of myocardial collagen and late gadolinium enhancement but not disarray (p = 0.0003, 0.04, and NS, respectively). CONCLUSIONS: In this patient with HCM and heart failure, regions of myocardial late gadolinium enhancement by CMR represented regions of increased myocardial collagen but not disarray.
Moon et al. (2004) conducted a case report in Hypertrophic cardiomyopathy (n=1). Late gadolinium enhancement cardiovascular magnetic resonance vs. Histologic examination of explanted heart was evaluated on Relationship between the extent of late gadolinium enhancement and myocardial collagen (r = 0.7, p=< 0.0001). Late gadolinium enhancement on CMR significantly correlated with increased myocardial collagen (r = 0.7, p < 0.0001) but not myocardial disarray in a patient with hypertrophic cardiomyopathy.