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Journal Information
Vol. 31. Issue 4.
Pages 317-319 (April 2012)
Visits
10633
Vol. 31. Issue 4.
Pages 317-319 (April 2012)
Image in cardiology
Open Access
One patient, one mutation and two cardiomyopathies – Hypertrophic cardiomyopathy and left ventricular noncompaction
Um doente, uma mutação e 2 miocardiopatias – miocardiopatia hipertrófica associada a não compactação do ventrículo esquerdo
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10633
Ricardo Faria
Corresponding author
ricardofaria555@gmail.com

Corresponding author.
, Walter Santos, Ana Camacho, Nuno Marques, Rui Ferrinha, Vasco Marques, Ilídio de Jesus
Serviço de Cardiologia, Hospital de Faro, Faro, Portugal
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Case report

A 34-year-old woman with a history of smoking was observed for rapid palpitations of 12 years’ evolution. The symptoms occurred daily and were of short duration and not associated with dizziness, syncope or chest pain. She had no family history of sudden death, but her father had been diagnosed with idiopathic dilated cardiomyopathy. In the course of assessment she underwent electrocardiography, which revealed sinus bradycardia (36bpm), criteria of left ventricular hypertrophy, abnormal R-wave progression in the precordial leads, nonpathological Q waves, nonspecific alterations in ventricular repolarization in DII, DIII, aVF and V3–V6, and long QTc. Echocardiography showed undilated cardiac chambers and good biventricular systolic function. The left ventricle (LV) presented nonobstructive hypertrophy of the basal segments of the anterior and inferior septum and inferior wall (Figure 1), with a maximum thickness of 21 mm. Hypertrabeculation was observed at the apical level, particularly in the posterior and lateral wall segments (Figures 2 and 3). The ratio of noncompacted to compacted layers was 2.3, measured in parasternal short-axis view at end-systole. Injection of contrast showed myocardial noncompaction at the apical level (Figure 4). Magnetic resonance imaging (MRI), performed to characterize the cardiac morphology in more detail, confirmed the presence of asymmetric LV hypertrophy associated with LV noncompaction (LVNC) (Figure 5), with a ratio of noncompacted to compacted layers of 3.3, measured at end-diastole. MRI also revealed multiple areas of delayed enhancement in the hypertrophied segments. Holter monitoring did not record any clinically significant arrhythmias and exercise testing showed normal blood pressure changes. The patient's symptoms disappeared after initiation of therapy with bisoprolol. Echocardiographic study of relatives was negative for both hypertrophic cardiomyopathy (HCM) and LVNC. Genetic study identified the mutation G1505A in exon 17 of the MYBPC3 gene, which results in an amino acid substitution at position 502 of the protein (Arg502Gln).

Figure 1.

Apical 2-chamber view at end-diastole, showing inferior wall hypertrophy (asterisk) measuring 21mm.

(0.08MB).
Figure 2.

Apical 4-chamber view, showing hypertrabeculation (arrows) of the mid-apical segments of the lateral wall.

(0.09MB).
Figure 3.

Left parasternal short-axis view, with color Doppler showing blood flow within the trabecular recesses of the apex.

(0.09MB).
Figure 4.

Detail of apical hypertrabeculation (arrows) in apical 4-chamber view after injection of contrast.

(0.09MB).
Figure 5.

MRI showing myocardial hypertrophy (asterisks) and hypertrabeculation (arrows).

(0.07MB).
Discussion

HCM is the most common genetic heart disease, with a prevalence of 1:500. Transmission is autosomal dominant and over 900 mutations have been identified in 11 genes encoding sarcomeric proteins.1 LVNC is a rare cardiomyopathy with a prevalence of less than 1:5000 and is genetically heterogeneous. The case presented meets the echocardiographic criteria of Jenni et al., and the MRI criteria of Petersen et al. for LVNC,2 which, like HCM, is associated with sudden death. Various mutations that have previously been identified in patients with HCM, including the one found in this case, have been found in patients with LVNC but without HCM.3 There is no information available on the prognostic significance of this mutation. The present case is unusual in that both cardiomyopathies were present in the same patient and the mutation identified may be responsible for both LVNC and HCM.

Conflicts of interest

The authors have no conflicts of interest to declare.

References
[1]
B.J. Maron.
Hypertrophic cardiomyopathy: a systematic review.
JAMA, 287 (2002), pp. 1308-1320
[2]
E. Oechslin, R. Jenni.
Left ventricular non-compaction revisited: a distinct phenotype with genetic heterogeneity?.
Eur Heart J, 32 (2011), pp. 1446-1456
[3]
N. Cardim, A. Perrot, Santos, et al.
Miocardiopatia hipertrófica na população portuguesa: Mutações da proteína C que liga a miosina.
Rev Port Cardiol, 24 (2005), pp. 1463-1476

Please cite this article as: Faria, R, et al. Um doente, uma mutação e duas miocardiopatias – miocardiopatia hipertrófica associada a não compactação do ventrículo esquerdo. Rev Port Cardiol. 2012. doi:10.1016/j.repc.2012.02.004

Copyright © 2011. Sociedade Portuguesa de Cardiologia
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