Decorative dot pattern background image.
Decorative blue shape background image. Decorative blue shape background image. Decorative blue shape background image. Decorative blue shape background image.


Trial Overview

Official Title

Stimulation Of the Left Ventricular Endocardium for Cardiac Resynchronization Therapy in Non-Responders and Previously Untreatable Patients (SOLVE CRT)

Study Purpose

This study is a prospective, multi-center, randomized, controlled, double blinded, pivotal trial to study the safety and efficacy of the WiSE-CRT System for Cardiac Re-synchronization Therapy.


Heart Failure



Inclusion Criteria

  1. Patient with a class I or IIa (1) or (2) indication for implantation of a CRT-D device according to current available guidelines (with additional QRS criteria on Class IIa (1)):
    1. Class I: NYHA II, III, IV, EF ≤ 35%, LBBB, QRS ≥ 150ms
    2. Class IIa (1): NYHA II, III, IV, EF≤ 35%, LBBB, QRS ≥ 130 to < 150ms
    3. Class IIa (2): NYHA II, III, IV, EF≤ 35%, non-LBBB, QRS ≥ 150ms
  2. Patient is a:
    1. 'Non-responder': Patients who have a CRT system that is functional and despite an adequate trial of Guideline Directed Medical Therapy (GDMT) and attempts at optimal device programming the patient has not responded to therapy for a minimum of 6 months. Non-response is defined as:
      • EF has remained unchanged or worsened (defined as < 5% increase since implant), and
      • The patient's clinical status based in the totality of available clinical evidence (such as NYHA Class, exercise tolerance, QOL, or global assessment) has remained unchanged or worsened, as determined by the local Site Enrollment Committee


    1. 'Previously Untreatable': Patients who have a full or partial CRT system, who meet general inclusion criteria and are deemed as 'previously untreatable' for one of the following reasons:

i. Patients in whom CS lead implantation for CRT has failed

    • CS lead implant was attempted but abandoned due any of the following: difficult CS access or anatomy, inadequate lead location, inadequate pacing thresholds, persistent phrenic nerve pacing, or other procedural challenges

ii. CS lead implanted but has been programmed OFF

    • LV lead that was implanted but not operational includes patients in whom the LV lead is inoperative or programmed off due to improper function such as high threshold, non-capture, phrenic nerve pacing, lead failure, lead dislodgement, or sub-optimal LV lead location


c. 'High Risk Upgrade:

Patients who have a relative contraindication to CS lead implant, due to:

    • venous occlusion or lesion precluding implant
    • pocket infection risk (at co-implanted device site)
    • considered high risk for CS implant due to co-morbidities
  1. Patients on a stable Guideline Directed Medical Therapy (GDMT)
  2. Patient must be 18 years old or over
  3. Patient has signed and dated informed consent
  4. Patient has suitable anatomy for implant of the WiSE CRT System (e.g. adequate acoustic window, LV wall thickness in target implant area ≥ 5 mm, absence of LV wall structural abnormalities which may preclude implant)

Exclusion Criteria

Patients who meet any one of these criteria will be excluded from the investigation:

  1. Pure RBBB
  2. LVEDD ≥ 8cm
  3. Non-ambulatory or unstable NYHA class IV
  4. Contraindication to heparin, chronic anticoagulants or antiplatelet agents
  5. Triple anticoagulant patients who cannot tolerate peri-procedural stopping of anticoagulation therapy
  6. Attempted device implant (pacemaker, ICD, CRT, LV lead) or successful co-implant within prior 30 days.
  7. Patients with planned or expected lithotripsy treatment post implant
  8. Life expectancy of < 12 months
  9. Chronic hemodialysis
  10. Stage 4 or 5 renal dysfunction defined as eGFR < 30
  11. Grade 4 mitral valve regurgitation
  12. Noncardiac implanted electrical stimulation therapy devices
  13. Mechanical aortic valves or TAVR valves
  14. Unstable angina, acute MI, CABG, or PTCA within the past 1 month
  15. Correctable valvular disease that is the primary cause of heart failure
  16. Recent CVA or TIA (within the previous 3 months)
  17. Atrial fibrillation/flutter: Patients with a history of paroxysmal or persistent atrial fibrillation/flutter may be included if they have been in sinus rhythm for the past 30 days, and have not had cardioversion in the past 30 days. Patients with AV node ablation may be included if they have not had symptomatic atrial fibrillation/flutter in the last 30 days, and have not had cardioversion in the past 30 days.
  18. Already included in another clinical study that could confound the results of this study
  19. Pregnancy
  20. Known drug or alcohol addiction or abuse
  21. Moderate or severe aortic stenosis
  22. Subject unable to attend follow-up at the investigative center or unable, for physical or mental reasons, or to comply with the trial's procedures
  23. Patient will not tolerate being randomized to the Control Group for 6 months


  • Device: WiSE System
  • The WiSE System is an implantable cardiac system to provide LV pacing stimulation in conjunction with a co-implanted system that provides right ventricular stimulation.
Key Participation Requirements
Trial Location(s)
Male or Female
18 Years and older
Enrollment Status
Active, Not Recruiting
Not Applicable
Methodist Health System Trial Code
Related Specialties