Outcome of super-responders to cardiac resynchronization therapy defined by endpoint-derived parameters of left ventricular remodeling: a two-center retrospective study

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• 作者：David Hürlimann ; Susann Schmidt ; Burkhardt Seifert…
• 关键词：Cardiac resynchronization therapy ; Cardiac failure ; Super ; responder ; Cardiac devices ; CRT device ; Left ventricular remodeling
• 刊名：Clinical Research in Cardiology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：104
• 期：2
• 页码：136-144
• 全文大小：305 KB
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• 刊物主题：Cardiology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-0692

文摘

Aims Various studies have attempted to identify super-responders to cardiac resynchronization therapy (CRT) by echocardiographic parameters of reverse remodeling. However, scientific evidence regarding those parameters is scarce. This study aimed at validating the definition of super-response to CRT based on the following frequently employed echocardiographic parameters: left ventricular ejection fraction (LVEF), end-diastolic volume index (EDVI), and end-systolic volume index (ESVI). Methods and results We retrospectively investigated echocardiographic data and outcomes of 542 patients after CRT implantation. The primary endpoint comprised all-cause mortality, heart transplantation, ventricular assist device implantation (VAD), and hospitalization for heart failure. Secondary endpoints were hospitalization for heart failure, and the combination of all-cause mortality, heart transplantation and VAD. Two approaches were employed defining super-response based on improvement of echocardiographic parameters: one derived from the negative predictive value (NPV) for clinical endpoints, and second from best quartiles of improvement. Using the NPV method, an absolute 25?% increase in LVEF, a relative 38?% reduction in EDVI, and 46?% in ESVI were calculated as optimal cut-offs identifying 4.9, 18.5, and 21.3?% as super-responders. The best quartiles method resulted in lower cut-off values, i.e. 14?% increase in LVEF, 26?% reduction in EDVI, and 36?% in ESVI. All cut-offs except LVEF ?5% were significantly associated with improved outcomes after 5?years (median follow-up 35.7?months). Conclusions NPV- and best quartile-based cut-offs validate previously applied empirical echocardiographic cut-offs to define super-response to CRT. These data provide evidence for using these empirical cut-offs in daily practice and facilitate inter-study comparability.