Volume 17, Issue 8 pp. 871-876

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

MICHELA CASELLA M.D.

MICHELA CASELLA M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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ANTONIO DELLO RUSSO M.D., Ph.D.

ANTONIO DELLO RUSSO M.D., Ph.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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MANUELA PACE M.D.

MANUELA PACE M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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GEMMA PELARGONIO M.D.

GEMMA PELARGONIO M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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CAROLINA IERARDI M.D.

CAROLINA IERARDI M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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TOMMASO SANNA M.D.

TOMMASO SANNA M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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LOREDANA MESSANO M.D.

LOREDANA MESSANO M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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GIANLUIGI BENCARDINO M.D.

GIANLUIGI BENCARDINO M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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SERGIO VALSECCHI

SERGIO VALSECCHI

Medtronic Italy

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FORTUNATO MANGIOLA M.D.

FORTUNATO MANGIOLA M.D.

Neuromuscular Centre, UILDM, Rome, Italy

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GAETANO A. LANZA M.D.

GAETANO A. LANZA M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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PAOLO ZECCHI M.D.

PAOLO ZECCHI M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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FILIPPO CREA M.D., F.A.C.C.

FILIPPO CREA M.D., F.A.C.C.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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FULVIO BELLOCCI M.D.

FULVIO BELLOCCI M.D.

Institute of Cardiology, Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, Rome, Italy

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First published: 25 May 2006
Citations: 12
Address for correspondence: Michela Casella, M.D., Istituto di Cardiologia Dipartimento di Medicina Cardiovascolare Policlinico Universitario “A. Gemelli” L.go Gemelli, 8 00168 Rome, Italy. Fax: 0039063055535; E-mail: [email protected]

This study was supported by Telethon, Italy, Grant GUP02067. Mr. Valsecchi is a Medtronic employee.

Manuscript received 20 January 2006; Revised manuscript received 21 March 2006; Accepted for publication 28 March 2006.

Abstract

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.

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