Subclinical cardiac involvement in patients with facioscapulohumeral muscular dystrophy.
Myocardial involvement is a common finding in certain myopathies, while it has not been extensively investigated in facioscapulohumeral muscular dystrophy (FSHD1A). Aim of this study was to assess in FSHD1A patients the electrical and functional properties of the myocardium. Twenty-four patients with FSHD1A (mean age 41.2+/-14.5 years) and 24 matched healthy subjects were studied. Standard- and signal-averaged electrocardiography were recorded to determine QT dispersion and the presence of ventricular late potentials (VLPs). Standard echocardiography with systo-diastolic variations of integrated backscatter signal (CV-IBS) were performed to assess functional properties of the myocardium. Compared with control subjects, patients with FSHD1A had significantly lower CV-IBS and higher QT dispersion. Nine patients had positive VLPs. QT and QTc dispersion were inversely related to CV-IBS at both septum and posterior wall levels. Moreover, septal CV-IBS was inversely related to the Kpnl-BinI4q fragment size. These results suggest a subclinical cardiac involvement in FSHD1A patients, which can represent a substrate for ventricular arrhythmias and heart failure.
Galetta
Fabio
F
Department of Internal Medicine, School of Medicine, University of Pisa, Via Roma 67, 56126 Pisa, Italy. fgaletta@med.unipi.it
Franzoni
Ferdinando
F
Sposito
Roberto
R
Plantinga
Yvonne
Y
Femia
Francesca Romana
FR
Galluzzi
Fabio
F
Rocchi
Anna
A
Santoro
Gino
G
Siciliano
Gabriele
G
D000328:Adult; D001145:Arrhythmias, Cardiac / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology; D004452:Echocardiography; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008133:Long QT Syndrome / Q000000981:diagnostic imaging / Q000209:etiology* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D020391:Muscular Dystrophy, Facioscapulohumeral / Q000150:complications* / Q000503:physiopathology*