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Cardiac Magnetic Resonance GUIDEd Management of Mild-moderate Left Ventricular Systolic Dysfunction. (CMR_GUIDE)

F

Flinders University

Status

Active, not recruiting

Conditions

Left Ventricular Systolic Dysfunction
Heart Failure

Treatments

Device: ILR
Device: ICD

Study type

Interventional

Funder types

Other

Identifiers

NCT01918215
CMRG-HF-1

Details and patient eligibility

About

Contemporary heart failure (HF) guidelines recommend insertion of a primary prevention implantable defibrillator (ICD) in patients with left ventricular ejection fraction less than 35% (LVEF < 35%) on maximally tolerated medical therapy. Nevertheless, there are a substantial number of HF patients who have LVEF>35% and hence do not qualify for ICD, who succumb to sudden cardiac death (SCD). At present our tools to reliably risk stratify these patients with mild-moderate systolic dysfunction (LVEF 36-50%) are poor. It is likely that these patients have ventricular scar and/or replacement fibrosis as a substrate for their malignant arrhythmia. Cardiovascular magnetic resonance imaging (CMR) can reliably identify and quantify both ventricular scar (seen in Ischaemic cardiomyopathy, ICM) and replacement myocardial fibrosis (seen in Non-Ischemic Cardiomyopathy, NICM).

Methods/Design: A multi-centre randomised controlled trial in which 428 patients with mild-moderate left-ventricular systolic dysfunction (either ICM or NICM) and ventricular scar/fibrosis on cardiovascular magnetic resonance are randomized to either ICD or implantable loop recorder (ILR) insertion and are followed up until the last patient recruited has been in the study for 3 years.

Potentially eligible patients will have a screening CMR and will be enrolled into the device arm of study based on the presence of any ventricular scar/fibrosis (CMR +). Patients who do not have ventricular scar/fibrosis will be followed up in an observational registry, and will not be randomised.

In both the device and registry arms, we aim to enrol 700 patients in Australia and 355 in Europe.

The primary hypothesis is that among patients with mild-moderate left ventricular systolic dysfunction, a routine CMR guided management strategy of ICD insertion is superior to a conservative strategy of standard care.

Enrollment

449 patients

Sex

All

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

  • Age equal or greater than 18 years
  • Patients with coronary artery disease (CAD) or dilated cardiomyopathy (DCM) of the idiopathic, chronic post myocarditis or familial type.
  • Left ventricular systolic impairment as defined by left ventricular ejection fraction 36-50% by any current standard technique (echocardiogram, multiple gated acquisition scan (MUGA), angiography or CMR taken in the last six months. If a LGE CMR has been taken within 2 months this scan can be used for inclusion
  • Able and willing to comply with all pre-, post- and follow-up testing, and requirements
  • On maximum tolerated doses of ACE inhibitors (or Angiotensin and Receptor Blockers if intolerant of ACE) and Beta Blockers

Exclusion criteria

  1. History of cardiac arrest or spontaneous or inducible sustained ventricular tachycardia or ventricular fibrillation unless within 48 hours of an acute MI
  2. Cardiomyopathy related to sarcoidosis
  3. Standard Cardiac Magnetic Resonance imaging contraindications (e.g. severe claustrophobia)
  4. Currently implanted permanent pacemaker and/or pacemaker/ICD lead
  5. Clinical indication for ICD or Pacemaker or cardiac resynchronisation therapy.
  6. CMR LVEF ≤35% or>50%
  7. Severe renal insufficiency (eGFR< 30mls/min/1.73m2)
  8. Recent Myocardial Infarction (MI) (<40 days) or cardiac revascularization (<90 days)
  9. New York Heart Association HF functional class IV at baseline
  10. Conditions associated with life expectancy <1 year
  11. Pregnancy or in females of child-bearing potential, the non-use of accepted forms of contraception

Trial design

Primary purpose

Prevention

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

None (Open label)

449 participants in 2 patient groups

Device Implantation
Other group
Description:
A prospective, blocked, randomised, placebo-controlled trial of primary prophylaxis ICD therapy or implantable loop recorder (ILR) insertion in patients with LVEF 36-50% and Late Gadolinium Enhancement(LGE)on CMR
Treatment:
Device: ILR
Device: ICD
Observational Registry
No Intervention group
Description:
A prospective observational registry of patients with LVEF 36-50% and no LGE on CMR

Trial contacts and locations

18

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Data sourced from clinicaltrials.gov

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