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Heart Rate Turbulence as a Noninvasive Risk Predictor of Ventricular Tachyarrhythmias in Myotonic Dystrophy Type 1

2006; Wiley; Volume: 17; Issue: 8 Linguagem: Inglês

10.1111/j.1540-8167.2006.00517.x

1540-8167

Michela Casella, Antonio Dello Russo, Manuela Pace, Gemma Pelargonio, Carolina Ierardi, Tommaso Sanna, Loredana Messano, Gianluigi Bencardino, Sergio Valsecchi, Fortunato Mangiola, Gaetano Antonio Lanza, P Zecchi, Filippo Crea, Fulvio Bellocci,

Cardiac electrophysiology and arrhythmias

Introduction: Myotonic dystrophy type 1 (MD1) is the most common muscular dystrophy of adult life. Cardiac involvement is characterized by disorders of atrioventricular conduction, ventricular arrhythmias, and sudden death. Heart rate turbulence (HRT) is a noninvasive risk predictor in patients affected by ischemic heart disease. The aim of our study is to assess the prognostic value of HRT in MD1 patients. Methods and Results: We performed HRT analysis by 24‐hour Holter recording to calculate turbulence onset (TO) and turbulence slope (TS) in 29 MD1 patients (mean age 52 ± 10 years), and in 30 patients (mean age 52 ± 13 years) with frequent ventricular arrhythmias and structurally normal heart (VANH). An electrophysiological study (EPS) tested ventricular arrhythmias inducibility in 22 MD1 patients. TO was significantly different between MD1 and VANH patients (−1.66 ± 2.04 and −2.98 ± 1.79%, respectively, P 0.01), while no difference was observed in TS between MD1 and VANH patients (11.12 ± 6.46 and 9.12 ± 6 msec/beat, respectively). On EPS, sustained ventricular arrhythmias (SVA) were induced in six MD1 patients. TO was significantly different in inducible MD1 patients (0.88 ± 1.95%), as compared with both noninducible (−2.49 ± 1.43%, P < 0.001) or no eligible to EPS (−1.93 ± 1.63%, P < 0.005) MD1 patients and to VANH patients (−2.98 ± 1.79%, P < 0.001). Conclusions: An impairment of TO, a measure of HRT, suggesting impaired cardiac parasympathetic activity, may be a useful, noninvasive predictor of arrhythmic risk in MD1 patients.