ABC | Volume 110, Nº1, January 2018

Original Article Paixão et al Correlation of ECG with RM in hypertrophic cardiomyopathy Arq Bras Cardiol. 2018; 110(1):52-59 Figure 3 – Distribution of the patients according to the hypertrophy pattern. Concentric 14 21% Apical 7 10% Septal 47 69% Left atrial overload was more frequent in apical hypertrophy (42.9%), with no statistical significance (p = 0.4082). However, right atrial overload was rare, being identified in only two patients with septal hypertrophy. Table 1 – Median and percentiles for mass and percentage of myocardial fibrosis on cardiac magnetic resonance imaging, according to the location of myocardial hypertrophy Variables Apical Concentric Septal p-value K-W AxC AxS CxS Fibrosis mass (grams) Median (P25; P75) 0 (2; 27) 7 (40; 83.5) 0 (3.5; 15) <.0001 0.0210 0.9974 < 0.0001 % Fibrosis Median (P25; P75) 0 (2; 20) 4 (20; 31.75) 0 (3; 13) 0.0014 0.1160 0.9998 0.0010 P25: 25th Percentile; P75: 75th Percentile. P-values: K-W: Kruskal-Wallis test; multiple comparisons between the groups: AxC: Apical x Concentric; AxS: Apical x Septal; CxA: Concentric x Apical (Dunn’s multiple comparison test). Figure 4 – Means of the mass and percentage of myocardial fibrosis on cardiac magnetic resonance imaging according to the location of myocardial hypertrophy. Fibrosis mass (g) Location of hypertrophy Location of hypertrophy Fibrosis % Concentric Septal Apical Concentric Septal Apical 60.0 50.0 40.0 30.0 20.0 10.0 0.0 11.2 57.07 11.45 8.4 20.41 7.63 25.0 20.0 15.0 10.0 5.0 0.0 Intraventricular blocks, such as left bundle-branch block, right bundle-branch block and left anterior hemiblock, were infrequent in the three types of hypertrophy, with no statistical difference between the groups. (Table 2, Figure 5) 55