© 2002 European Society of Cardiology
Cardiac resynchronization therapy in advanced heart failure the multicenter InSync clinical study
Unité de Soins et de Cardiologie Interventionnelle Polyclinique Saint Henri, Place Beaumanoir, 44100 Nantes, France
* Corresponding author. Tel.: +33-2-4044-2528; fax: +33-2-4044-2524. E-mail address: dangras{at}aol.com
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Abstract |
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Background: recent short-term observations have shown an improvement in cardiac function and heart failure symptoms from atrio-biventricular pacing. This study was designed to assess the safety and feasibility of an atrio-biventricular transvenous pacing system, and examine the long-term effects of cardiac resynchronization in patients with advanced heart failure and ventricular conduction abnormalities.
Methods and results: between August, 1997 and November, 1998, 103 patients received a cardiac resynchronization system (CRS) consisting of a pulse generator interfaced with an atrio-biventricular lead system, including a lead designed for left ventricular (LV) pacing via cardiac veins. Baseline evaluation included 12-lead electrocardiogram, estimation of New York Heart Association (NYHA) functional class, assessment of quality of life (QOL), and distance covered during a 6-min walk (6-MW). Detailed echocardiographic data were also collected in a subset of 46 patients. Measurements were repeated in all surviving patients at 1, 3, 6 and 12 months after implantation of the CRS. A single, self-limiting procedure-related complication occurred. Over a follow-up of 12 months, 21 patients died. The 12-month actuarial survival was 78% (CI 70–87%). Nine surviving patients were withdrawn from the study during long-term follow-up for miscellaneous reasons. At each point of follow-up, a significant shortening of QRS duration was measured. In addition, significant improvements were observed in mean NYHA functional class, 6-MW and QOL score. In the 46 patients with complete echocardiographic data, LV ejection fraction increased from 21.7±6.4% at baseline to 26.1±9.0% at last follow-up (P=0.006), LV end diastolic dimension decreased from 72.7±9.2 to 71.6±9.1 mm (P=0.233), interventricular mechanical delay decreased from 27.5±32.1 to 20.3±25.5 ms (P=0.243), mitral regurgitation apical four-chamber area decreased from 7.66±5.5 to 6.69±5.9 cm2 (P=0.197), and left ventricular filling time increased from 363±127 to 408±111 ms (P=0.002). Conclusions: long-term cardiac resynchronization can be safely and reliably achieved by transvenous atrial synchronized right and left ventricular pacing. These changes were accompanied by clinically relevant improvements in functional status and QOL, as well as a measurable increase in LV performance. The outcome of randomised controlled trials is awaited.
Key Words: 6-MW, 6-min walk • ECG, electrocardiogram • ECHO, echocardiogram • LV, left ventricular • CRS, cardiac resynchronization system • NYHA, New York Heart Association • QOL, quality of life • RV, right ventricular
Received December 21, 2001; Accepted January 14, 2002
For the InSync Investigators.
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