Comparison of CRT-D and CRT-DX Systems (CRT-NEXT)

  • participants needed
  • sponsor
    Associazione Portatori Dispositivi Impiantabili Cardiaci
Updated on 2 July 2022


The principal objective is to test non-inferiority of the CRT-DX system as compared to a conventional CRT-D system, in terms of the combined endpoint of mortality, hospitalizations due cardiovascular causes, any complication leading to loss of lead functionality, in the subset of patients without evidence of sinus dysfunction on optimal therapy.


Resting heart rate is strongly associated with incident worsening Heart Failure (HF) and mortality. Current devices for cardiac resynchronization (CRT-D) normally provide atrio-ventricular (AV) sequential pacing modes during resynchronization, but the best pacing programming strategy is not clear.

On the one hand a basic rate of 50 to 70 bpm (optionally with some rate-responsive function) could be considered for therapy up-titration, specifically betablockers; on the other hand, increasing pacing rates may partially reduce benefits from resynchronization, reducing filling time and contractility reservoir.

The Pegasus investigation is the only large randomized investigation comparing DDD with 70 bpm basic rate to DDD(R) @40 bpm. Results showed no difference in investigation endpoints, including mortality and HF-hospitalization.

These results may support the use of a device implementing both a CRT function and a right ventricular single-lead with and an atrial sensing dipole (CRT-DX system). This system can track ventricular pacing and resynchronization following atrial sensing, even if it cannot provide atrial pacing support. It should be assessed whether such limitation is counterbalanced by the advantages related to the reduced number of necessary leads, with simplified implantation and less complications.

The objective of the investigation is to assess whether atrial pacing support is really necessary in the subset of patients with indication to CRT-D and no evidence of sinus dysfunction on optimal therapy. The investigation will test the hypothesis that a CRT-DX system is not inferior to a conventional CRT-D system in this class of subjects.

Condition Heart failure, Congestive Heart Failure, Heart failure, Heart disease, Heart disease, Cardiac Disease, Cardiac Resynchronization Therapy, Congestive Heart Failure, Cardiac Disease, cardiac failure, congestive heart disease
Treatment Conventional 3-lead CRT defibrillator system implantation, 2-lead CRT defibrillator system implantation
Clinical Study IdentifierNCT03587064
SponsorAssociazione Portatori Dispositivi Impiantabili Cardiaci
Last Modified on2 July 2022

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