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Europace 2009 11(3):343-349; doi:10.1093/europace/eup038
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Published on behalf of the European Society of Cardiology. All rights reserved. © The Author 2009. For permissions please email: journals.permissions@oxfordjournals.org

Pacing and Cardiac Resynchronization Therapy

Identification of ‘super-responders’ to cardiac resynchronization therapy: the importance of symptom duration and left ventricular geometry

Natália António*, Rogério Teixeira, Lourenço Coelho, Carolina Lourenço, Pedro Monteiro, Miguel Ventura, João Cristóvão, Luís Elvas, Lino Gonçalves and Luís A. Providência

Department of Cardiology, Coimbra University Hospital and Medical School, Avenida Bissaya Barreto, 3000-076 Coimbra, Portugal

Aims: Some patients show such an important clinical improvement and reverse remodelling after cardiac resynchronization therapy (CRT) that anatomy and function approach normal. These patients have been called ‘super-responders’. The aim of our study was to identify predictors of becoming a super-responder after CRT.

Methods and results: Eighty-seven consecutive patients who underwent CRT were prospectively studied. Before CRT and 6 months after, clinical and echocardiographic evaluation was performed. Patients with a decrease in New York Heart Association functional class ≥1, a two-fold or more increase of left ventricular ejection fraction (LVEF) or a final LVEF >45%, and a decrease in LV end-systolic volume >15% were classified as super-responders. There were 12% super-responders. At baseline, there were no significant differences between super-responders and the other patients, except for the fact that super-responders had significantly smaller mitral regurgitation and LV end-diastolic diameter (LVEDD) and a shorter duration of heart failure symptoms. Mitral regurgitation jet area, LVEDD, and duration of heart failure symptoms were correlated with this super-response. Moreover, an evolution of symptoms for <12 months was an independent predictor of super-response to CRT.

Conclusion: Patients in earlier phases of the cardiomyopathy, with a less altered ventricular geometry, seem to have a greater probability of becoming super-responders.

Key Words: Resynchronization therapy, Super-responders, Heart failure, Echocardiography

* Corresponding author. Tel: +351 239 400656, Fax: +351 239 780552, Email: natalia.antonio{at}gmail.com

Manuscript submitted 21 September 2008. Accepted after revision 23 January 2009.


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