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Comparative Study
English Abstract
Journal Article
[Clinical significance of magnetic resonance and echocardiographic correlations in the evaluation of hypertrophic cardiomyopathy].
La Radiologia Medica 1994 July
Relatively few clinical studies have investigated the role of MRI in the patients with hypertrophic cardiomyopathy. To assess MR capabilities in defining the presence, distribution and severity of left ventricular hypertrophy, the prevalence and clinical correlations of right ventricular hypertrophy and the prevalence and clinical implications of structural myocardial abnormalities, MRI and echocardiography were performed on 37 unselected patients with hypertrophic cardiomyopathy. The two methods were in agreement in 100% of cases in diagnosing the disease and classifying left ventricular hypertrophy as asymmetric, concentric or apical, and in 92% of cases in assessing the topographic distribution of hypertrophy of ventricular segments. A statistically significant linear correlation was found between echocardiographic and MR measurements of interventricular septum (r = 0.69, p < 0.0001, SEE = 4) and left posterior wall of the left ventricle (r = 0.67, p < 0.0001, SEE = 2.4). Right ventricular hypertrophy (right anterior wall diastolic thickness > 5 mm) was demonstrated by MRI in 23 of 33 patients (70%). In this group, left posterior wall thickness and left atrial diameter were higher (15 +/- 4 vs 11 +/- 2, p < 0.01 and 45 +/- 9 vs 38 +/- 5 mm, p < 0.05, respectively). On T2-weighted sequences, areas of reduced signal intensity, probably due to myocardial fibrosis, were detected in 16 cases (43%). This group was characterized by higher max. septal thickness (25 +/- 7 vs 21 +/- 6 mm, p < 0.05) and max. left posterior wall thickness (15 +/- 9 vs 7 +/- 8 mm, p < 0.05). All the three cases with dilated and hypokinetic left ventricle showed this kind of tissue abnormality. In conclusion, MRI provided clear, accurate and exhaustive data on the presence and distribution of left ventricular hypertrophy in hypertrophic cardiomyopathy. Right ventricular hypertrophy and structural abnormalities of ventricular myocardium can also be detected and quantified. Right ventricular involvement is associated with more severe hypertrophy of left ventricular posterior wall. Structural myocardial abnormalities, probably due to fibrosis, are related to the extent of left ventricular hypertrophy.
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